IGMP and IGMP Snooping

IGMP Snooping

IGMP snooping is a Layer 2 switch process that extracts lists of hosts receiving multicast group traffic by monitoring IGMP network packets. The switch uses these lists to avoid flooding hosts with extraneous multicast traffic by sending group packets only to group members. Besides preventing local hosts from receiving traffic for groups they did not join, snooping prunes multicast traffic from links that do not contain IGMP clients.

When snooping is enabled, a switch examines IGMP packets sent between hosts connected to network switches and multicast routers (mrouters). When a switch finds an IGMP report from a multicast group recipient, it adds the recipient's port to the group multicast list. When the switch receives an IGMP leave, it removes the recipient's port from the list. Groups are removed upon the group timer expiry. When the switch finds an IGMP query packet or PIM hello packet from a multicast router, it adds the router's port to the port list for all multicast groups.

Snooping Querier

Snooping requires an IGMP querier in the network to create multicast group tables. An IGMP snooping querier performs the multicast router (mrouter) role when the network does not have a router. When the snooping querier is enabled on a VLAN, the switch periodically broadcasts IGMP queries and listens for IGMP Reports that indicate host group memberships.

Networks that contain multiple snooping queriers elect one as the querier, based on IP address. When IGMP snooping querier is enabled on a VLAN, the switch performs as a querier only when it is elected or it is the only snooping querier on the network.

L2 Report Flooding

L2 report flooding is an IGMP snooping feature that forwards membership report messages to specified ports. Relying on a single switch to maintain and send report messages can degrade performance. L2 report flooding addresses this by facilitating report message forwarding through any network port. This allows switches to bypass the querier when forwarding multicast traffic to its interested ports.

IGMP Snooping Proxy

IGMP snooping proxy is an enhancement over IGMP snooping. When snooping proxy is enabled, the switch starts sending proxy queries periodically to the downstream hosts and collects the IGMP reports and updates the local state. Later, when the switch receives an IGMP query from an upstream router, the switch immediately responds with a report based on its local state.

When IGMP snooping proxy is disabled, the IGMP queries in VLAN, and the reports from hosts are flooded. Enabling IGMP snooping proxy prevents a sudden burst in IGMP report traffic in response to every query. It also reduces the number of reports that the IGMP Querier needs to process in the VLAN. However, it introduces a latency in the propagation of the IGMP state through the VLAN.

IGMP Host Proxy Description

The figure displays a typical IGMP host-proxy implementation. The customer network connects to the sender network through the edge switch's Ethernet 1 interface, which is configured as an IGMP host proxy. PIM is enabled within the sender and customer networks but not on the connection between the networks.

Figure 1. IP IGMP Host Proxy Implementation

The IGMP proxy agent sends unsolicited IGMP joins when a (S,G) or (*,G) entry arrives in the multicast routing table (mroute table). Subsequently, IGMP reports are sent when queries or group-specific queries arrive on the host proxy interface. When the customer network is void of active listeners, the connection eventually expires and the senders stop transmitting to the network.

IGMP host proxy requires the following:
  • PIM Multicast Border Router (MBR) must be enabled on the interface.
  • IP IGMP and IP multicast must be enabled.
  • The switch must be an RP or in each host's RP path.
  • Fast-drop entries are required when there are no interested listeners for the group.

IGMP host proxy is configurable to filter for specific multicast groups and sources.

IGMP Protocols

IGMP

Networks use Internet Group Management Protocol (IGMP) to control the flow of layer 3 multicast traffic. Hosts request and maintain multicast group membership through IGMP messages. Multicast routers use IGMP to maintain a membership list of active multicast groups for each attached network.
  • IGMP version 1 is defined in RFC 1112. Hosts can join multicast groups without a method to leave a group. Routers use a timeout-based process to determine when hosts lose interest in a group.
  • IGMP version 2 is defined in RFC 2236. Version 2 adds leave messages that hosts use to terminate group membership.
  • IGMP version 3 is defined in RFC 4604. Version 3 allows hosts to specify IP addresses within a group from where they receive traffic. Traffic from all other group addresses is blocked from the host.

With respect to each of its attached networks, a multicast router is either a querier or non-querier. Each physical network contains only one querier. A network with more than one multicast router designates the router with the lowest IP address as its querier.

Queriers solicit group membership information by periodically sending General Query messages. Queriers also receive unsolicited messages from hosts joining or leaving a multicast group. When a querier receives a message from a host, it updates its membership list for the group referenced in the message and the network where the message originated.

Queriers forward multicasts from remote sources only to networks as specified by its membership list. If a querier does not receive a report from a network host for a specific group, it removes the corresponding entry from the table and discontinues forwarding multicasts for that group on the network. Queriers also send group-specific queries after receiving a leave request from a host to determine if the network still contains active multicast group members. If it does not receive a membership report during the period defined by the last member query response interval, the querier removes the group-network entry from the membership list.

When a host receives a General Query, it responds with Membership Report messages for each of its multicast groups within the interval specified by the Max Response Time field in the query. IGMP suppresses multiple messages from different hosts on a network for the same group. Hosts send unsolicited Membership reports to join a multicast group and send leave messages to exit a group.

Configuring IGMP

This section describes the following configuration tasks:

Enabling IGMP

Enabling PIM also enables IGMP on that interface. When the switch fills the multicast routing table, it only adds interfaces when the interface receives join messages from downstream devices or when the interface is directly connected to a member of the IGMP group.

By default, PIM and IGMP are disabled on an interface. Use the pim ipv4 sparse-mode or pim ipv4 bidirectional command to enable PIM and IGMP on the configuration mode interface.

Example

This command enables PIM and IGMP on interface vlan 8.
switch(config)# interface vlan 8
switch(config-if-Vl8)# pim ipv4 sparse-mode
switch(config-if-Vl8)#

In the unlikely event that the IGMP agent needs to run on an interface without PIM being enabled, use the ip igmp command.

Example

This command enables IGMP on interface vlan 8 without enabling PIM.
switch(config)# interface vlan 8
switch(config-if-Vl8)# ip igmp
switch(config-if-Vl8)#

Configuring IGMP Settings

An interface that runs IGMP uses default protocol settings unless otherwise configured. The switch provides commands that alter startup query, last member query, and normal query settings.

IGMP Version

The switch supports IGMP versions 1 through 3. The ip igmp version command configures the IGMP version on the configuration mode interface. Version 3 is the default IGMP version.

Example

This command configures IGMP version 3 on interface vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp version 3
switch(config-if-Vl4)#

Startup Query

Membership queries are sent at an increased frequency immediately after an interface starts up to quickly establish the group state. Query count and query interval commands adjust the period between membership queries for a specified number of messages.

The ip igmp startup-query-interval command specifies the interval between membership queries that an interface sends immediately after it starts up. The ip igmp startup-query-count command specifies the number of queries that the switches sends from the interface at the startup interval rate.

  • Example
    These commands define a startup interval of 15 seconds for the first 10 membership queries sent from interface vlan 12.
    switch(config)# interface vlan 12
switch(config-if-Vl12)# ip igmp startup-query-interval 150
switch(config-if-Vl12)# ip igmp startup-query-count 10
switch(config-if-Vl12)#

Membership Queries

The router with the lowest IP address on a subnet sends membership queries as the IGMP querier. When a membership query is received from a source with a lower IP address, the router resets its query response timer. Upon timer expiry, the router begins sending membership queries. If the router subsequently receives a membership query originating from a lower IP address, it stops sending membership queries and resets the query response timer.

The ip igmp query-interval command configures the frequency at which the active interface, as an IGMP querier, sends membership query messages.

The igmp query-max-response-time command configures the time that a host has to respond to a membership query.

Example

These commands define a membership query interval of 75 seconds and a query response timer reset value of 45 seconds for queries sent from interface vlan 15.
switch(config)# interface vlan 15
switch(config-if-Vl15)# ip igmp query-interval 75
switch(config-if-Vl15)# igmp query-max-response-time 450
switch(config-if-Vl15)#

Last Member Query

When the querier receives an IGMP leave message, it verifies the group has no remaining hosts by sending a set of group-specific queries at a specified interval. If the querier does not receive a response to the queries, it removes the group state and discontinues multicast transmissions.

The ip igmp last-member-query-count (LMQC) command specifies the number of query messages the router sends in response to a group-specific or group-source-specific leave message.

The ip igmp last-member-query-interval command configures the transmission interval for sending group-specific or group-source-specific query messages to the active interface.

Example

These commands program the switch to send 3 query messages, one every 25 seconds, when interface vlan 15 receives an IGMP leave message.
switch(config)# interface vlan 15
switch(config-if-Vl15)# ip igmp last-member-query-interval 250
switch(config-if-Vl15)# ip igmp last-member-query-count 3
switch(config-if-Vl15)#

Static Groups

The ip igmp static-group command configures the configuration mode interface as a static member of the multicast group at the specified address. The router forwards multicast group packets through the interface without otherwise appearing or acting as a group member. No interface is a static member of a multicast group by default.

Note: To become a static member of a multicast group, the switch must be the PIM designated router (DR) for the network. If it is not, you can use the pim ipv4 dr-priority command to make it the DR by configuring its PIM DR value to be the highest on the network.

Example

These commands configure interface vlan 15 as the PIM designated router, then configure it as a static member of the multicast group at address 231.1.1.15 for multicast data packets that originate at 10.1.1.1.
switch(config)# interface vlan 15
switch(config-if-Vl15)# pim ipv4 dr-priority 5000
switch(config-if-Vl15)# ip igmp static-group 231.1.1.45 10.1.1.1
switch(config-if-Vl15)#

Configuring IGMP Snooping

This section describes the following configuration tasks:

Enabling Snooping

The switch provides two control settings for snooping IGMP packets:
  • Global settings control the availability of IGMP snooping on the switch. Snooping is globally enabled by default.
  • Per-VLAN settings control IGMP on individual VLANs. If snooping is enabled on the VLAN, it follows the global snooping state.

The ip igmp snooping command controls the global snooping setting. The ip igmp snooping vlan command configures snooping on individual VLANs.

Examples
  • This command globally enables snooping on the switch.
    switch(config)# ip igmp snooping
switch(config)#
  • This command disables snooping on VLANs 2, 3, and 4.
    switch(config)# no ip igmp snooping vlan 2-4
switch(config)#

Configuring Snooping Parameters

Specifying a Static Multicast Router Connection

The ip igmp snooping vlan multicast-router command statically configures a port that connects to a multicast router to join all multicast groups. The port to the router must be in the specified VLAN range.

Snooping may not always be able to locate the IGMP querier. This command is for IGMP queriers that are known to connect through the network to a port on the switch.

Example

This command configures the static connection to a multicast router through Ethernet port 3.
switch(config)# ip igmp snooping vlan 2 mrouter interface ethernet 3
switch(config)#

Adding a Port to a Multicast Group

The ip igmp snooping vlan member command adds an a port to a multicast group. The IP address must be an unreserved IPv4 multicast address. The interface to the port must be in the specified VLAN range.

Example

This command configures the static connection to a multicast group at 237.2.1.4 through interface ethernet 3.
switch(config)# ip igmp snooping vlan 7 member 237.2.1.4 interface ethernet 3
switch(config)#

Robustness Variable

The robustness variable specifies the number of unacknowledged snooping queries that a switch sends before removing the recipient from the group list.

The ip igmp snooping robustness-variable command configures the robustness variable for all snooping packets sent from the switch. The default value is 2.

Example

This command sets the robustness-variable value to 3.
switch(config)# ip igmp snooping robustness-variable 3
switch(config)#

Configuring Interface Startup initial Query Times

The ip igmp snooping interface-restart-query command configures the interface startup initial query times in milliseconds. If nothing is configured, a default value of 2000 milliseconds is used. Issuing the command replaces any values already configured. Multiple values may be input in a single command; this makes the mechanism more resilient in the case of dropped packets.

Examples
  • This command configures interfaces to send IGMP queries at 1000, 2000, and 4000 milliseconds (i.e., 1 second, 2 seconds, and 4 seconds) after an interface restart or spanning tree change.
    switch(config)# ip igmp snooping interface-restart-query 1000 2000 4000
switch(config)#
  • This command configures interfaces to send a single IGMP query of 5000 milliseconds (5 seconds) after an interface restart or spanning tree change.
    switch(config)# ip igmp snooping interface-restart-query 5000
switch(config)#

Snooping Querier

The IGMP snooping querier supports snooping by sending Layer 2 membership queries to hosts attached to the switch. Note that if IGMP snooping is enabled, QoS will not apply to IGMP packets.

Enabling the Snooping Querier

Enabling the snooping querier on an interface requires the explicit configuration of a global querier address or a local querier address for the interface. See Configuring Snooping Querier Parameters.

The switch provides two control settings for controlling the snooping querier:
  • The global setting controls the querier on VLANs for which there is no snooping querier command.
  • VLAN querier settings take precedence over the global querier setting.

The ip igmp snooping querier command controls the global querier setting. When enabled globally, the querier is controlled on individual VLANs through the ip igmp snooping vlan querier command.

The ip igmp snooping vlan querier command controls the querier for the specified VLANs. VLANs follow the global querier setting unless overridden by one of these commands:
  • ip igmp snooping vlan querier enables the querier on specified VLANs.
  • no ip igmp snooping vlan querier disables the querier on specified VLANs.
Example
  • These commands globally enables the snooping querier on the switch, explicitly disables snooping on VLANs 1-4, and explicitly enables snooping on VLANs 5-8.
    switch(config)# ip igmp snooping querier
switch(config)# no ip igmp snooping vlan 1-4 querier
switch(config)# ip igmp snooping vlan 5-8 querier
switch(config)#
  • This command removes the querier setting for VLANs 3-6:
    switch(config)# default ip igmp snooping vlan 3-6 querier
switch(config)#
Globally Set the Snooping Querier Version

The ip igmp snooping querier version command configures the IGMP snooping querier version. Version 2 is the default IGMP snooping version.

Example

This command globally configures IGMP snooping querier version 2.
switch(config)# ip igmp snooping querier version 2
switch(config)#

The ip igmp snooping vlan querier version command configures IGMP globally on the VLAN. Version 2 is the default IGMP snooping version.

Example

This command configures IGMP snooping vlan querier version vlan 5.
switch(config)# ip igmp snooping vlan 5 querier version 2
switch(config)#

Configuring Snooping Querier Parameters

Querier Address
The switch provides two IP addresses for setting the querier source:
  • The global address is used by VLANs for which there is no querier address command.
  • VLAN querier address settings take precedence over the global querier address.

The snooping querier address specifies the source IP address for IGMP snooping query packets that the switch transmits. The source address is also used to elect a snooping querier when the subnet contains multiple snooping queriers.

The default global querier address is not defined. When the configuration includes a snooping querier, a querier address must be defined globally or for each interface that enables a querier.

The ip igmp snooping querier address command sets the global querier source IP address for the switch. VLANs use the global address unless overwritten with the ip igmp snooping vlan querier address command. The default global address is not defined.

The ip igmp snooping vlan querier address command sets the source IP address for query packets transmitted from the specified VLAN. This command overrides the ip igmp snooping querier address for the specified VLAN.

Examples

  • This command sets the source IP address for query packets that the switch transmits to 10.1.1.41.

    switch(config)# ip igmp snooping querier address 10.1.1.41
switch(config)#

  • This command sets the source IP address for query packets that vlan 2 transmits to 10.14.1.1.

    switch(config)# ip igmp snooping vlan 2 querier address 10.14.1.1
switch(config)#
Membership Query Interval

The query interval is the period (seconds), between IGMP Membership Query message transmissions. The interval ranges from 5 to 3600 seconds.

The ip igmp snooping querier query-interval command specifies the global query interval for packets the switch sends as a snooper querier. The default global setting is 125 seconds.

The ip igmp snooping vlan querier query-interval command specifies the query interval for packets sent from the snooping querier to the specified VLAN, overriding the global setting. VLANs that do not specify a query interval use the global setting.

Examples

  • This command sets a query interval of 150 seconds for queries transmitted from VLANs for which a query interval is not configured.

    switch(config)# ip igmp snooping querier query-interval 150
switch(config)#

  • This command sets the query interval of 240 seconds for queries transmitted from vlan 2.

    switch(config)# ip igmp snooping vlan 2 querier query-interval 240
switch(config)#
Membership Query Response Interval
The Max Response Time field, in Membership Query messages, specifies the longest time a host can wait before responding with a Membership Report message. In all other messages, the sender sets the field to zero and the receiver ignores it. The switch provides two values for setting this field:
  • The global value is used by VLANs for which there is no Max Response Time command.
  • VLAN values take precedence over the global value for the specified VLAN.

The ip igmp snooping querier max-response-time command specifies the global Max Response Time value used in snooping query packets transmitted from the switch. Values range from 1 to 25 seconds with a default of 10 seconds. VLANs use the global setting unless overwritten with the ip igmp snooping vlan querier max-response-time command.

The ip igmp snooping vlan querier max-response-time command configures the Max Response Time field contents for packets transmitted from the specified VLAN, overriding the global setting.

Examples
  • This command sets the maximum response time of 15 seconds for queries transmitted from VLANs for which a maximum response time is not configured.
    switch(config)# ip igmp snooping querier max-response-time 15
switch(config)#
  • This command sets a maximum response time of 5 seconds for queries that vlan 2 transmits.
    switch(config)# ip igmp snooping vlan 2 querier max-response-time 5
switch(config)#
Last Member Query

When the querier receives an IGMP leave message, it verifies the group has no remaining hosts by sending a set of group-specific queries at a specified interval. If the querier does not receive a response to the queries, it removes the group state and discontinues multicast transmissions.

The switch provides two values for setting this field:
  • The global value is used by VLANs for which there is no last-member-query-interval defined.
  • VLAN values take precedence over the global value for the specified VLAN.

The ip igmp snooping querier last-member-query-interval command specifies the global last-member-query-interval used in snooping query packets transmitted from the switch. This value is used for VLANs that do not have a value specified. Values range from 1 to 25 seconds with a global default of one second.

The ip igmp snooping vlan querier last-member-query-interval command configures the last-member-query-interval field contents for packets transmitted from the specified VLAN, overriding the global setting.

Example

This command sets the global snooping querier last-member-query-interval to 5 seconds and the vlan 10 last-member-query-interval to 12 seconds.
switch(config)# ip igmp snooping querier last-member-query-interval 5
switch(config)# ip igmp snooping vlan 10 querier last-member-query-interval 12
switch(config)#
Interface Restart Query Spoofing

When the port status (link status or spanning tree status) changes, an IGMP general query is spoofed based on the information of the last known IGMP querier. This facilitates faster network convergence time.

By default, interfaces wait 2000 milliseconds before sending the spoofed IGMP query. To configure the delay before the spoofed query is sent, use the ip igmp snooping interface-restart-query command. This setting is applied to all ports.

Example

This command configures the switch to send general IGMP queries at 100 milliseconds, 200 milliseconds, and 300 milliseconds after interface restart or spanning tree status change. 
switch(config)# ip igmp snooping interface-restart-query 100 200 300

IGMP Snooping L2 Report Flooding

L2 report flooding is an IGMP snooping feature that forwards membership report messages to specified ports. Report flooding is disabled by default and must be enabled globally before it can be enabled on individual interfaces.

The list of ports that can forward membership report messages must be explicitly configured. Commands are available to define lists of ports that are valid for all VLANs and port lists that are valid for specified VLAN ranges. Ports can forward membership reports only if they are configured to handle VLAN traffic, regardless of any report flooding configuration settings.

Enabling L2 Report Flooding

These commands enable L2 report flooding:

Example

These commands enable L2 report flooding globally, and on VLANs 201-205.
switch(config)# ip igmp snooping report-flooding
switch(config)# ip igmp snooping vlan 201-205 report-flooding
switch(config)#

Configuring Forwarding Ports

These commands specify the ports that forward membership report messages:

Example

These commands enable Ethernet ports 5-9 to forward reports on all VLANs and ports 12-15 on VLANs 201-205.
switch(config)# ip igmp snooping report-flooding switch-port ethernet 5-9
switch(config)# ip igmp snooping vlan 201-205 report-flooding switch-port ethernet 
12-15
switch(config)#

IGMP Snooping Filters

IGMP snooping filters assigns IGMP profiles only to Layer 2 interfaces, and for Layer 3 interfaces use multicast boundary filters to control the multicast groups that the interfaces can join. An IGMP profile specifies a filter type and a list of address ranges. The address ranges comprise the multicast groups covered by the profile. The filter type determines an interface's accessibility to the multicast groups:
  • Permit filters define the multicast groups the interface can join.
  • Deny filters define the multicast groups the interface cannot join.

Profiles are created in IGMP-profile configuration mode, then applied to an interface in interface configuration mode.

The ip igmp profile command places the switch in IGMP profile configuration mode. The permit / deny and range commands specify the profile's filter type and address range. A profile may contain multiple range statements to define a discontiguous address range.

Example

These commands create an IGMP profile named list_1 by entering IGMP-profile configuration mode, configure the profile to permit multicast groups 231.22.24.0 through 231.22.24.127, and return the switch to global configuration mode.
switch(config)#ip igmp profile list_1
switch(config-igmp-profile-list_1)#permit
switch(config-igmp-profile-list_1)#range 231.22.24.0 231.22.24.127
switch(config-igmp-profile-list_1)#exit
switch(config)#

The ip igmp snooping filter command applies an IGMP profile to the configuration mode interface.

Example

These commands apply the list_1 snooping profile to interface ethernet 7.
switch(config)#interface ethernet 7
switch(config-if-Et7)#ip igmp snooping filter list_1
switch(config-if-Et7)#

Verifying IGMP Snooping

Show commands are available to display various configurations and IGMP snooping status. IGMP snooping that are viewable include:
  • show ip igmp snooping
  • show ip igmp snooping counters
  • show igmp snooping querier
  • show igmp snooping querier counters
  • show igmp snooping querier membership
IGMP Snooping Status

The show ip igmp snooping command displays the switch’s IGMP snooping configuration.

Example

This command displays the switch’s IGMP snooping configuration.
switch>show ip igmp snooping
   Global IGMP Snooping configuration:
-------------------------------------------
IGMP snooping                  : Enabled
Robustness variable            : 2

Vlan 1 :
----------
IGMP snooping                  : Enabled
Multicast router learning mode : pim-dvmrp

Vlan 20 :
----------
IGMP snooping                  : Enabled
Multicast router learning mode : pim-dvmrp

Vlan 2028 :

switch>
IGMP Snooping Counters

The show ip igmp snooping counters command displays the number of IGMP messages sent and received through each switch port. The display table sorts the messages by type.

Example

This command displays the number of messages received on each port.
switch>show ip igmp snooping counters
                       Input                  |            Output
Port   Queries Reports  Leaves  Others  Errors|Queries Reports  Leaves  Others
------------------------------------------------------------------------------
Cpu      15249  106599       4  269502       0   30242  102812     972    3625
Et1          0       0       0       0       0       0       0       0       0
Et2          0       6       1      26       0    5415       0       0     731
Et3          0   10905     222    1037       0   15246       0       0    1448
Et4          0   44475      21     288       0   15247       0       0    2199
Et5          0     355       0      39       0   15211       0       0    2446
Et6          0     475      13       0       0   15247       0       0    2487
Et7          0       0       0     151       0   15247       0       0    2336
Et8          0     578       6      75       0    2859       0       0     931
Et9          0       0       0      27       0   15247       0       0    2460
Et10         0   12523     345      54       0   15247       0       0    2433
Et11         0       0       0       0       0       0       0       0       0
Et12         0    4509      41      22       0   15247       0       0    2465
Et13         0     392      29     119       0   15247       0       0    2368
Et14         0      88       3       6       0   15247       0       0    2481
Et15         0   16779     556      72       0   15117       0       0      66
Et16         0    2484      13      66       0   15247       0       0    2421
Et17         0       0       0       0       0       0       0       0       0
Et18         0      20       6     160       0    3688       0       0     803
Et19         0    4110      17       0       0   15247       0       0    2487
Et20         0       0       0       0       0       0       0       0       0
Et21         0       0       0       0       0       0       0       0       0
Et22         0       0       0      52       0   15247       0       0    2435
Et23         0    5439     181     138       0   15247       0       0    2349
Et24         0    2251      21       4       0   15247       0       0    2483
Po1      45360  540670    8853  464900       0   15249  224751     618    2576
Po2          0  101399      58      17       0   15120       0       0    1121
switch       0       0       0       0       0       0       0       0       0
IGMP Snooping Querier

The show igmp snooping querier command displays snooping querier configuration and status information. Command provides options to only include specific VLANs.

Example

This command displays the querier IP address, version, and port servicing each VLAN.
switch>show igmp snooping querier
Vlan  IP Address       Version  Port
----------------------------------------
1     172.17.0.37      v2       Po1
20    172.17.20.1      v2       Po1
26    172.17.26.1      v2       Cpu
2028  172.17.255.29    v2       Po1
switch>
IGMP Snooping Querier Counters

The show igmp snooping querier counters command displays the counters from the querier, as learned through Internet Group Management Protocol (IGMP).

Example

This command displays the counters from the querier.
switch>show igmp snooping querier counters 
-----------------------------------------------------------------------
Vlan: 1    IP Addr: 100.0.0.1       Op State: Querier     Version:  v3

v1 General Queries Sent         :0
v1 Queries Received             :0
v1 Reports Received             :0
v2 General Queries Sent         :1
v2 Queries Received             :0
v2 Reports Received             :25
v2 Leaves Received              :0
v3 General Queries Sent         :655
v3 GSQ Queries Sent             :0
v3 GSSQ Queries Sent            :8
v3 Queries Received             :654
v3 Reports Received             :2385
Error Packets                   :0
Other Packets                   :0
switch>
IGMP Snooping Querier Membership

The show igmp snooping querier membership command displays the membership from the querier, as learned through Internet Group Management Protocol (IGMP).

Example

This command displays the membership from the querier from vlan 1.
switch>show igmp snooping querier membership 
-------------------------------------------------------------------------
Vlan: 1    Elected: 100.0.0.1       QQI: 125  QRV: 2  QRI: 10  GMI: 260 

Groups           Mode  Ver  Num of Sources                               
-------------------------------------------------------------------------
10.0.0.2        EX    v3   0 []
10.0.0.3        IN    v3   2 [ 3.3.3.3, 3.3.3.4 ]
10.0.0.4        EX    v3   0 []
10.0.0.13       EX    v3   0 []
10.0.0.22       EX    v3   0 []
10.0.0.1        IN    v3   3 [ 5.6.7.9, 5.6.7.8, ... ]
switch>

Configuring IGMP Snooping Proxy

Use the ip igmp snooping proxy command to enable IGMP snooping proxy globally. Enabling IGMP snooping proxy enables it for all VLANs where IGMP snooping is enabled. IGMP snooping proxy is globally disabled by default.

Use the ip igmp snooping proxy command to enable IGMP snooping proxy globally. Use the no ip igmp snooping vlan proxy command to disable IGMP snooping proxy on specified VLANs.

Examples

  • This command globally enables IGMP snooping proxy on the switch.

    switch(config)# ip igmp snooping proxy
switch(config)#
  • This command disables IGMP snooping proxy on vlan 2, vlan 3, and vlan 4.
    switch(config)# no ip igmp snooping proxy vlan 2-4 proxy
switch(config)#

Configuring Snooping Proxy Querier

To configure the IGMP snooping proxy querier use the existing ip igmp snooping querier commands. For more information on these commands, refer to IGMP and IGMP Snooping Commands.

Note: The proxy querier by default uses 0.0.0.0 as the IP address.
Example
In this example, IGMP snooping proxy is enabled using the ip igmp snooping proxy command and the snooping proxy is set to reports for all the VLANs except VLANs 100 through 110 using the ip igmp snooping vlan command. The proxy querier operates in version 3 and sends queries at a 15-second interval and hosts can take up to 5 seconds to respond.
switch(config)#ip igmp snooping proxy
switch(config)#no ip igmp snooping vlan 100-110 proxy
switch(config)#ip igmp snooping querier query-interval 15
switch(config)#ip igmp snooping querier max-response-time 5
switch(config)#ip igmp snooping querier version 3
switch(config)#ip igmp snooping querier
switch(config)#

IGMP Host Proxy

Interfaces on the switch can be configured to serve as IGMP host proxies. An IGMP host proxy exchanges IGMP reports (joins/leaves) between networks whose connection does not support PIM along network boundaries.

IGMP Host Proxy Description

The figure displays a typical IGMP host-proxy implementation. The customer network connects to the sender network through the edge switch's Ethernet 1 interface, which is configured as an IGMP host proxy. PIM is enabled within the sender and customer networks but not on the connection between the networks.

Figure 2. IP IGMP Host Proxy Implementation

The IGMP proxy agent sends unsolicited IGMP joins when a (S,G) or (*,G) entry arrives in the multicast routing table (mroute table). Subsequently, IGMP reports are sent when queries or group-specific queries arrive on the host proxy interface. When the customer network is void of active listeners, the connection eventually expires and the senders stop transmitting to the network.

IGMP host proxy requires the following:
  • PIM Multicast Border Router (MBR) must be enabled on the interface.
  • IP IGMP and IP multicast must be enabled.
  • The switch must be an RP or in each host's RP path.
  • Fast-drop entries are required when there are no interested listeners for the group.

IGMP host proxy is configurable to filter for specific multicast groups and sources.

IGMP Host Proxy Configuration

Enabling IGMP Host Proxy

Enable PIM MBR on the interface using the pim ipv4 border-router command. The IGMP host proxy service is then configured on the interface using the ip igmp host-proxy command. When the host proxy is configured, it sends reports for (S,G) entries in the multicast routing (mroute) table if these are the only routes there; if there are any (*,G) entries, it sends reports only for these. To send reports for a specific group even when there is no (*, G) entry in the mroute table for that group, include the group address in the ip igmp host-proxy command. Multiple ip igmp host-proxy statements are required to specify multiple groups. The interval between IGMP reports is configured by ip igmp host-proxy report-interval.

Host Proxy IGMP Version and Source Filtering

IGMP host proxies can be configured with IGMP versions 1, 2, or 3, and uses version 3 by default. When the host-proxy IGMP version is set to 3, the proxy can explicitly include or exclude source addresses. Otherwise, include/exclude configuration for source addresses is ignored. The IGMP version of unsolicited reports is specified with the ip igmp host-proxy version command. Reports that are triggered by IGMP queries, however, are sent in the same IGMP version as the received query. (An interface may also have a different IGMP version configured on it for other purposes using the ip igmp version command.)

Using ACLs

IGMP host proxy can also be enabled for the addresses defined by an ACL; if one or more groups are configured in addition to ACLs, the groups are processed first. Implicit deny in the ACL is ignored, but if the ACL includes an explicit deny rule, then the interface sends joins only to groups configured directly on the interface or included in a permit ACL. Deny rules take precedence over permit rules. If a group is configured with no filters and a host-proxy is configured with an ACL with rules having filters for the group, or configured with groups and source filters, then the filters are applied to the group.

Disabling Host Proxy or Removing an Individual Group or Source

The no igmp host-proxy command can be entered with group or source parameters to remove the specified group or source from the list. Entering the no igmp host-proxy command without specifying group or source disables the forwarding of all IGMP reports on the interface.

Examples
  • These commands enable IGMP host proxy on interface ethernet 17 for all multicast group addresses. 
    switch(config)# interface ethernet 17
switch(config-if-Et17)# pim ipv4 border-router
switch(config-if-Et17)# ip igmp host-proxy
switch(config-if-Et17)#
  • These commands enable IGMP host proxy on interface ethernet 18 for the multicast group at 231.10.10.1. The list of source addresses is not restricted.
    switch(config)# interface ethernet 18
switch(config-if-Et18)# pim ipv4 border-router
switch(config-if-Et18)# ip igmp host-proxy 231.10.10.1
switch(config-if-Et18)#
  • These commands enable IGMP host proxy on interface ethernet 19 for the multicast group at 231.10.10.2. The list of source addresses only excludes 10.4.4.1 and 10.4.5.2.
    switch(config)# interface ethernet 19
switch(config-if-Et19)# pim ipv4 border-router
switch(config-if-Et19)# ip igmp host-proxy 231.10.10.2 exclude 10.4.4.1
switch(config-if-Et19)# ip igmp host-proxy 231.10.10.2 exclude 10.4.5.2
switch(config-if-Et19)#
  • These commands enable IGMP host proxy on interface ethernet 16 for the multicast group at 231.10.10.3. The list of source address for this group only includes 10.5.5.1 and 10.5.5.2.
    switch(config)# interface ethernet 16
switch(config-if-Et16)# pim ipv4 border-router
switch(config-if-Et16)# ip igmp host-proxy 231.10.10.3 include 10.5.5.1
switch(config-if-Et16)# ip igmp host-proxy 231.10.10.3 include 10.5.5.2
switch(config-if-Et16)#
  • These commands configure an IGMP host proxy interval of 5 seconds on interface port-channel 100.
    switch(config)# interface port-channel 100
switch(config-if-Po100)# ip igmp host-proxy report-interval 5
switch(config-if-Po100)#
  • These commands enable IGMP host proxy on interface ethernet 17 for the group address(es) specified in ACL acl1.
    switch(config)# interface ethernet 17
switch(config-if-Et17)# pim ipv4 border-router
switch(config-if-Et17)# ip igmp host-proxy access-list acl1
switch(config-if-Et17)#

IGMP and IGMP Snooping Commands

IGMP Configuration Commands (Interface Configuration Mode)

IGMP Clear Commands

IGMP Display Commands

IGMP Snooping Configuration Commands (Global Configuration Mode)

IGMP Configuration Commands (Interface Configuration Mode)

IGMP Snooping Clear Commands

IGMP Snooping Display Commands

IGMP Profile Configuration Mode Commands

IGMP Host Proxy Commands

clear ip igmp group

The clear ip igmp group command deletes IGMP cache entries as follows:

  • clear ip igmp group all entries from the IGMP cache.
  • clear ip igmp group gp_addr all entries for a specified multicast group.
  • clear ip igmp group interface int_id all entries that include a specified interface.
  • clear ip igmp group gp_addr interface int_id all entries for a specified interface in a specified group.

Command Mode

Privileged EXEC

Command Syntax

clear ip igmp group [ gp_addr][ interface INT_ID]

Parameters
  • gp_addr multicast group IP address (dotted decimal notation).
  • INT_ID interface name. Options include:
    • ethernet e_num Ethernet interface specified by e_num.
    • loopback l_num Loopback interface specified by l_num.
    • management m_num Management interface specified by m_num.
    • port-channel p_num Port-channel interface specified by p_num.
    • vlan v_num VLAN interface specified by v_num.
    • VXLAN vx_num VXLAN interface specified by vx_num.
Examples
  • This command deletes all IGMP cache entries for the multicast group 231.23.23.14.
    switch# clear ip igmp group 231.23.23.14
switch#
  • This command deletes IGMP cache entries for interface ethernet 16 in multicast group 226.45.10.45.
    switch# clear ip igmp group 226.45.10.45 interface ethernet 16
switch#

clear ip igmp snooping counters

The clear ip igmp snooping counters command resets the snooping message counters for the specified interface. The snooping counters for all interfaces are reset if the command does not include an interface name.

The show ip igmp snooping counters command displays the counter contents. See the show ip igmp snooping counters command description for a list of available snooping counters.

Command Mode

Privileged EXEC

Command Syntax

clear ip igmp snooping counters [INT_NAME]

Parameters

INT_NAME interface name. Formats include:
  • ethernet e_num Ethernet interface specified by e_num.
  • port-channel p_num Port-channel interface specified by p_num.
  • switch virtual interface to an L2 querier.

Example

This command clears the snooping counters for messages received on interface ethernet 15.
switch(config)# clear ip igmp snooping counters ethernet 15
switch(config)#

clear ip igmp statistics

The clear ip igmp statistics command resets IGMP transmission statistic counters for the specified interface.

Command Mode

Privileged EXEC

Command Syntax

clear ip igmp statistics [INTF_ID]

Parameters

INTF_ID nterface name. Options include:
  • no parameter all interfaces.
  • interface ethernet e_num Ethernet interface specified by e_num.
  • interface loopback l_num Loopback interface specified by l_num.
  • interface management m_num Management interface specified by m_num.
  • interface port-channel p_num Port-channel interface specified by p_num.
  • interface vlan v_num VLAN interface specified by v_num.
  • interface xlan vx_num VXLAN interface specified by vx_num.

Example

This command resets IGMP transmission statistic counters on interface tehernet 1.
switch# clear ip igmp statistics interface ethernet 1
switch#

igmp query-max-response-time

The igmp query-max-response-time command configures the query-max-response-time variable for the configuration mode interface. This variable is used to set the Max Response Time field in outbound Membership Query messages. Max Response Time specifies the maximum period a recipient can wait before responding with a Membership Report.

The router with the lowest IP address on a subnet sends membership queries as the IGMP querier. When a membership query is received from a source with a lower IP address, the router resets its query response timer. Upon timer expiry, the router begins sending membership queries. If the router subsequently receives a membership query originating from a lower IP address, it stops sending membership queries and resets the query response timer.

The no igmp query-max-response-time and default igmp query-max-response-time commands restore the default query-max-response-time of 10 seconds for the configuration mode interface by removing the corresponding igmp query max-response-time command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

igmp query-max-response-time period

no igmp query-max-response-time

default igmp query-max-response-time

Parameters

period maximum response time (deciseconds). Values range from 1 to 31744 (52 minutes, 54 seconds). Default is 100 (10 seconds).

Example

This command configures the query-max-response-time of 180 deciseconds (18 seconds) for interface vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# igmp query-max-response-time 180
switch(config-if-Vl4)#

ip igmp

The ip igmp command enables IGMP on a routed interface or on SVI (VLAN interface) without enabling PIM.

The no ip igmp command removes the corresponding ip igmp command from running-config.

Command Mode

Interface Configuration

Command Syntax

ip igmp

no ip igmp

Example

This command enables IGMP on interface ethernet 5/2.
switch(config)# interface ethernet 5/2
switch(config-if-Et5/2)# ip igmp
switch(config-if-Et5/2)#

ip igmp host-proxy

The ip igmp host-proxy command enables the IGMP host proxy service on the configuration mode interface. The IGMP host proxy performs IGMP joins and leaves between networks that are directly connected by an exchange that does not support PIM on the network boundary.

Note: For an interface to serve as an IGMP host proxy, PIM MBR must also be enabled on that interface using the pim ipv4 border-router command.

The IGMP host proxy sends unsolicited IGMP join reports when an (S,G) or (*,G) entry arrives in the multicast routing (mroute) table. Reports are subsequently sent upon the arrival of queries on the interface. The interval between IGMP reports is configured through ip igmp host-proxy report-interval.

The ip igmp host-proxy command can also specify a group address; this ensures that reports are generated for the specified group even if there is no (*,G) entry in the mroute table for that group. Multiple ip igmp host-proxy statements are required to specify multiple groups.

When the host proxy IGMP version is set to 3 using the ip igmp host-proxy version command, the ip igmp host-proxy command can also include or exclude source addresses. These options are ignored when the interface runs host proxy IGMP version 1 or 2. Note that the IGMP version set using the ip igmp version command does not affect host proxy behavior.

An ACL can also be used in place of a group address by using the access-list option. If one or more groups are configured in addition to ACLs, the groups are processed first. Implicit deny in the ACL is ignored, but if the ACL includes an explicit deny rule, then the interface sends joins only to groups configured directly on the interface or included in a permit ACL. Deny rules take precedence over permit rules. If a group is configured with no filters and a host-proxy is configured with an ACL with rules having filters for the group, or configured with groups and source filters, then the filters are applied to the group.

The no ip igmp host-proxy and default ip igmp host-proxy commands remove the corresponding ip igmp host-proxy command from running-config. When these commands do not include a group address, all ip igmp host-proxy statements are deleted. When inclusion or exclusion parameters are not specified, all statements with the specified group address are deleted.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp host-proxy [GROUP_ADDRESS [SOURCE_ADDRESS]]|[access-list acl]

no ip igmp host-proxy [GROUP_ADDRESS [SOURCE_ADDRESS]]

default ip igmp host-proxy [GROUP_ADDRESS [SOURCE_ADDRESS]]

Parameters
  • GROUP_ADDRESS     IPv4 address of group address for which host proxy sends reports.
    • no parameter     only groups for which there is a (*,G) entry in the mroute table.
    • ipv4_address     IP address of multicast group (dotted decimal notation). This ensures that reports are generated for this group even if it does not have a (*,G) entry in the mroute table.
  • SOURCE_ADDRESS     IP address of a host that originates multicast data packets.
    • no parameter    Proxy sends report for all received or configured groups regardless of source address.
    • exclude ipv4_address      Proxy does not send reports for specified source address.
    • include ipv4_address     Proxy always sends reports for specified source address.

    Commands that list at least one parameter must specify a group address. Parameters may be listed in any order. When a command specifies include and exclude parameters, the exclude parameter is ignored.

  • access-list acl     specifies an access control list (ACL); a join is sent for all groups and/or sources obtained by processing the rules from all configured ACLs.
  • version version     specifies the IGMP version on IGMP host-proxy interface. The value ranges from 1 to 3. Default value is 3.

Guidelines

Multiple statements for a group address may be configured. The effect of entering a command depends on previously entered commands. The following describes command combination:
  • ip igmp host-proxy: IGMP host proxy is enabled for all multicast groups and their source addresses. When enabled for all group addresses, the source address list cannot be restricted.
  • ip igmp host-proxy group_ipv4: IGMP host proxy is enabled for a specified multicast group. The list of source addresses for this group is not restricted. Enabling host proxy for another group address requires another ip igmp host-proxy command.
  • ip igmp host-proxy group_ipv4 exclude source_ipv4: IGMP host proxy is enabled for the specified multicast group. Sources for this group include all addresses not in an exclude statement. Multiple source addresses for the group are excluded by multiple statements.
  • ip igmp host-proxy group_ipv4 include source_ipv4: IGMP host proxy is enabled for the specified group address for only the specified source address. Additional statements are required to include other source addresses for the group. The presence of one include parameter invalidates all exclude statements for the specified multicast group.
  • ip igmp host-proxy access-list acl: IGMP host proxy is enabled for the addresses defined by the specified ACL. If one or more groups are configured in addition to ACLs, the groups are processed first. If the ACL has a deny all rule for a group, then this filter takes precedence over configurations with include /exclude keywords or permit/deny rules for that group. If a group is configured with no filters and a host-proxy is configured with an ACL with rules having filters for the group, or configured with groups and source filters, then the filters are applied to the group.
Examples
  • These commands enable IGMP host proxy on interface ethernet 17 for all multicast group addresses. 
    switch(config)# interface ethernet 17
switch(config-if-Et17)# pim ipv4 border-router 
switch(config-if-Et17)# ip igmp host-proxy
switch(config-if-Et17)#
  • These commands enable IGMP host proxy on interface ethernet 17 for the multicast group at 231.10.10.1. The list of source addresses is not restricted.
    switch(config)# interface ethernet 17
switch(config-if-Et17)# pim ipv4 border-router
switch(config-if-Et17)# ip igmp host-proxy 231.10.10.1
switch(config-if-Et17)#
  • These commands enable IGMP host proxy on interface ethernet 17 for the multicast group at 231.10.10.2. The list of source addresses only excludes 10.4.4.1 and 10.4.5.2.
    switch(config)# interface ethernet 17
switch(config-if-Et17)# pim ipv4 border-router
switch(config-if-Et17)# ip igmp host-proxy 231.10.10.2 exclude 10.4.4.1
switch(config-if-Et17)# ip igmp host-proxy 231.10.10.2 exclude 10.4.5.2
switch(config-if-Et17)#
  • These commands enable IGMP host proxy on interface ethernet 17 for the multicast group at 231.10.10.3. The list of source address for this group only includes 10.5.5.1 and 10.5.5.2.
    switch(config)# interface ethernet 17
switch(config-if-Et17)# pim ipv4 border-router
switch(config-if-Et17)# ip igmp host-proxy 231.10.10.3 include 10.5.5.1
switch(config-if-Et17)# ip igmp host-proxy 231.10.10.3 include 10.5.5.2
switch(config-if-Et17)#
  • These commands enable IGMP host proxy on interface ethernet 17 for the group address(es) specified in ACL acl1.
    switch(config)# interface ethernet 17
switch(config-if-Et17)# pim ipv4 border-router
switch(config-if-Et17)# ip igmp host-proxy access-list acl1
switch(config-if-Et17)#

ip igmp host-proxy report-interval

The ip igmp host-proxy report-interval command configures the period between unsolicited join reports that the switch sends as an IGMP host proxy from the configuration mode interface to a sender network after a (S,G) or (*,G) entry arrives in the multicast route (mroute) table. When the interface receives a query in response, this interval is set to the ip igmp last-member-query-interval. This command also enables the host proxy on the configuration mode interface if it was not previously enabled.

The no ip igmp host-proxy report-interval and default ip igmp host-proxy report-interval commands reset the query interval to the default value of one second by removing the corresponding ip igmp host-proxy report-interval command from running-config. The no ip igmp host-proxy and default ip igmp host-proxy commands also remove the corresponding report-interval command.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp host-proxy report-interval period

no ip igmp host-proxy report-interval

default ip igmp host-proxy report-interval

Parameters

period transmission interval (seconds) between consecutive reports. Value range: 1 (one second) to 31744 (8 hours, 49 minutes, 4 seconds). Default is 1 (one second).

Example

These commands configures a IGMP host proxy interval of 5 seconds on port channel 100.
switch(config)# interface port-channel 100
switch(config-if-Po100)# ip igmp host-proxy report-interval 5
switch(config-if-Po100)#

ip igmp host-proxy version

The ip igmp host-proxy version command configures the version number to be used in unsolicited reports when the interface is serving as an IGMP host proxy. To configure the IGMP version used by the interface for other purposes, use the ip igmp version command instead.

The no ip igmp host-proxy version and default ip igmp host-proxy version commands reset the version to the default value of 3.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp host-proxy version version_number

no ip igmp host-proxy version

default ip igmp host-proxy version

Parameters

version_number values range from 1 to 3. The default value is 3.

Example

These commands configure the IGMP host proxy version on port channel interface 100 to 2.
switch(config)# interface port-channel 100
switch(config-if-Po100)# ip igmp host-proxy version 2
switch(config-if-Po100)#

ip igmp last-member-query-count

The ip igmp last-member-query-count command specifies the number of query messages the switch sends in response to a group-specific or group-source-specific leave message.

After receiving a message from a host leaving a group, the switch sends query messages at intervals specified by ip igmp last-member-query-interval. If the switch does not receive a response to the queries after sending the number of messages specified by this parameter, it stops forwarding messages to the host.

Setting the Last Member Query Count (LMQC) to 1 causes the loss of a single packet to stop traffic forwarding. While the switch can start forwarding traffic again after receiving a response to the next general query, the host may not receive that query for a period defined by ip igmp query-interval.

The no ip igmp last-member-query-count and default ip igmp last-member-query-count commands reset the LMQC to the default value by removing the corresponding ip igmp last-member-query-count command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp last-member-query-count number

no ip igmp last-member-query-count

default ip igmp last-member-query-count

Parameters

number query message quantity. Values range from 0 to 3. Default is 2.

Example

This command configures the last-member-query-count to 3 on interface vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp last-member-query-count 3
switch(config-if-Vl4)#

ip igmp last-member-query-interval

The ip igmp last-member-query-interval command configures the switch's transmission interval for sending group-specific or group-source-specific query messages from the configuration mode interface.

When a switch receives a message from a host that is leaving a group it sends query messages at intervals set by this command. The ip igmp startup-query-count specifies the number of messages that are sent before the switch stops forwarding packets to the host.

If the switch does not receive a response after this period, it stops forwarding traffic to the host on behalf of the group, source, or channel.

The no ip igmp last-member-query-interval and default ip igmp last-member-query-interval commands reset the query interval to the default value of one second by removing the ip igmp last-member-query-interval command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp last-member-query-interval period

no ip igmp last-member-query-interval

default ip igmp last-member-query-interval

Parameter

period transmission interval (deciseconds) between consecutive group-specific query messages. Value range: 10 (one second) to 317440 (8 hours, 49 minutes, 4 seconds). Default is 10 (one second).

Example

This command configures the last member query interval of6 seconds for interface vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp last-member-query-interval 60
switch(config-if-Vl4)#

ip igmp profile

The ip igmp profile command places the switch in the IGMP-profile configuration mode to configure an IGMP profile. IGMP profiles control the multicast groups that an interface can join.

Profiles consist of the filter type and an address range:

Filter types specify accessibility to the listed address range:
  • Permit filters define the multicast groups the interface can join.
  • Deny filters define the multicast groups the interface cannot join.

Profiles are deny filters by default.

Address ranges specify a list of addresses and ranges:
  • In permit filters, permitted groups are specified by the address range.
  • In deny filters, all groups are permitted except those specified by the address range.
Implementing IGMP filtering affects IGMP report forwarding as follows:
  • IGMPv2: Report is forwarded to mrouters for permitted groups and dropped for disallowed groups.
  • IGMPv3: There may be multiple group records in a report.
    • No groups are allowed: The report is dropped.
    • All groups are allowed: The report is forwarded to mrouter ports as normal.
    • Some groups are allowed: A revised report is forwarded to mrouter ports.

The revised report includes records for the allowed group addresses with the same source MAC and IP addresses.

The no ip igmp profile and default ip igmp profile commands delete the specified IGMP profile from running-config.

The IGMP-profile configuration mode is not a group change mode; running-config is changed immediately upon entering commands. Exiting IGMP-profile configuration mode does not affect the configuration. The exit command returns the switch to global configuration mode.

Command Mode

Global Configuration

Command Syntax

ip igmp profile profile_name

no ip igmp profile profile_name

default igmp profile profile_name

Parameters

profile_name name of the IGMP profile.

Commands Available in igmp-profile Configuration Mode

Related Commands

ip igmp snooping filter applies an IGMP snooping filter to a configuration mode interface.

Example

These commands enter the IGMP-profile configuration mode and configure the profile as a permit list.
switch(config)# ip igmp profile list_1
switch(config-igmp-profile-list_1)# permit
switch(config-igmp-profile-list_1)#

ip igmp query-interval

The ip igmp query-interval command configures the frequency at which the configuration mode interface, as an IGMP querier, sends host-query messages.

An IGMP querier sends host-query messages to discover the multicast groups that have members on networks attached to the interface. The switch implements a default query interval of 125 seconds.

The no ip igmp query-interval and default ip igmp query-interval commands reset the IGMP query interval to the default value of 125 seconds by removing the ip igmp query-interval command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp query-interval period

no ip igmp query-interval

default ip igmp query-interval

Parameter

period interval (seconds) between IGMP query messages. Values range from 1 to 3175 (52 minutes, 55 seconds). Default is 125.

Example

This command configures the query-interval of 2 minutes, 30 seconds for interface vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp query-interval 150
switch(config-if-Vl4)#

ip igmp router-alert

The ip igmp router-alert command configures the switch disposition of inbound IGMP packets to the configuration mode interface based on the presence of the router-alert option in the IP header. By default, the port accepts all IGMP packets that arrive on the local subnet and rejects all other packets that arrive without the router-alert option.

The command provides three IGMP packet disposition options:
  • mandatory: packets are accepted only when router-alert is present.
  • optional: packets are accepted regardless of router-alert presence.
  • optional connected: packets are accepted from the same subnet; other packets require router-alert.

The no ip igmp router-alert and default ip igmp router-alert commands reset the default setting of optional connected on the configuration mode interface by removing the corresponding ip igmp router-alert command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp router-alert DISPOSITION

no ip igmp router-alert

default ip igmp router-alert

Parameters

DISPOSITION IGMP packet disposition method. Options include:
  • mandatory Rejects packets if router-alert is not present.
  • optional Accepts packets regardless of router-alert presence.
  • optional connected Accepts packets from same subnet. Other packets require router-alert.

Example

This command configures the switch to accept IGMP packets on interface ethernet 8 only if the IP header contains router alert.
switch(config)# interface ethernet 8
switch(config-if-Et8)# ip igmp router-alert mandatory
switch(config-if-Et8)#

ip igmp snooping

The ip igmp snooping command enables snooping globally. By default, global snooping is enabled.

When global snooping is enabled, ip igmp snooping vlan enables or disables snooping on individual VLANs. When global snooping is disabled, snooping cannot be enabled on individual VLANs.

QoS cannot be used for IGMP packets when IGMP snooping is enabled.

The no ip igmp snooping command disables global snooping. The default ip igmp snooping command restores the global snooping default setting of enabled by removing the ip igmp snooping command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping

no ip igmp snooping

default ip igmp snooping

Example

This command globally enables snooping on the switch.
switch(config)# ip igmp snooping
switch(config)#

ip igmp snooping filter

The ip igmp snooping filter command applies the specified IGMP snooping profile to the configuration mode interface. An IGMP snooping profile specifies the multicast groups that an interface may join. Profiles consist of the filter type and an address range:
  • Filter type: Specifies accessibility to the listed address range:
    • Permit filters define the multicast groups the interface can join.
    • Deny filters define the multicast groups the interface cannot join.
  • Address range: Specifies a list of addresses and ranges.
    • In permit filters, the permitted groups are specified by the address range.
    • In deny filters, all groups are permitted except those specified by the address range.

An interface without a snooping profile assignment may join any multicast group.

Snooping profiles are configured in IGMP-profile configuration mode (ip igmp profile).

The no ip igmp snooping filter and default ip igmp snooping filter commands restore the default setting of allowing an interface to join any multicast group by deleting the corresponding ip igmp snooping filter command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Command Syntax

ip igmp snooping filter profile_name

no ip igmp snooping filter [profile_name]

default ip igmp snooping filter [profile_name]

Parameters

profile_name name of profile assigned to interface.

Example

This command applies the list_1 snooping profile to interface ethernet 7.
switch(config)# interface ethernet 7
switch(config-if-Et7)# ip igmp snooping filter list_1
switch(config-if-Et7)#

ip igmp snooping interface-restart-query

The ip igmp snooping interface-restart-query command configures the interface startup initial query time used for IGMP query spoofing. When an interface restarts or there is a change to the spanning tree, the interface will send general IGMP queries after this interval. The query is based on the information of the last known IGMP querier, and serves to facilitate faster network convergence times.

Multiple values can be configured with a single command; issuing the command again replaces any previously configured value(s).

The no ip igmp snooping interface-restart-query and default ip igmp snooping interface-restart-query commands restore the default setting of 2000 milliseconds by deleting the corresponding ip igmp snooping interface-restart-query command from running-config.

Command Mode

General Configuration

Command Syntax

ip igmp snooping interface-restart-query query_time

no ip igmp snooping interface-restart-query

default ip igmp snooping interface-restart-query

Parameters

query_time interval (in milliseconds) after an interface restart or spanning tree change at which the interface will send general IGMP queries. Values range from 100 to 50000 milliseconds; default is 2000.

Example

This command configures interfaces to send IGMP queries at 100, 200, and 300 milliseconds after an interface restart or spanning tree change.
switch(config)# ip igmp snooping interface-restart-query 100 200 300
switch(config)#

ip igmp snooping proxy

The ip igmp snooping proxy command enables snooping proxy globally. By default, IGMP snooping proxy is disabled globally.

When the snooping proxy is enabled globally, it enables IGMP snooping proxy on an individual VLANs and when the IGMP snooping proxy is globally disabled the snooping proxy is disabled on individual VLANs.

The no ip igmp snooping proxy and default ip igmp snooping proxy commands disable snooping proxy globally and on individual VLANs by removing the ip igmp snooping proxy command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping proxy

no ip igmp snooping proxy

default ip igmp snooping proxy

Examples
  • This command globally enables snooping proxy on the switch.
    switch(config)# ip igmp snooping proxy
switch(config)#
  • This command explicitly disables IGMP snooping proxy on vlan 20.
    switch(config)# no ip igmp snooping vlan 20 proxy
switch(config)#

ip igmp snooping querier

The ip igmp snooping querier command enables the snooping querier globally, which controls the querier for VLANs that are not configured with a snooping querier command. The ip igmp snooping vlan querier command controls the querier on individual VLANs.

The IGMP snooping querier supports snooping by sending Layer 2 membership queries to hosts attached to the switch. The snooping querier is functional on VLANs where hosts receive IP multicast traffic without access to a network IP multicast router. A snooping querier avoids flooding multicast packets in the VLAN by querying for hosts and routers.

The IGMP snooping querier is functional on VLANs that meet these criteria:
  • Snooping is enabled.
  • The corresponding SVI (VLAN interface) is active.
  • The VLAN querier IP address or the global querier IP address is configured.

The no ip igmp snooping querier and default ip igmp snooping querier commands disable the snooping querier globally by removing the ip igmp snooping querier statement from running-config. The snooping querier is globally disabled by default.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier

no ip igmp snooping querier

default ip igmp snooping querier

Guidelines
  • Enabling a querier after it was disabled is equivalent to establishing a new querier.
  • Changing the querier IP address is equivalent to establishing a new querier.

Example

This command globally enables the snooping querier on the switch.
switch(config)# ip igmp snooping querier
switch(config)#

ip igmp snooping querier address

The ip igmp snooping querier address command sets the global querier source IP address, which specifies the source address for packets transmitted from VLANs for which a querier address (ip igmp snooping vlan querier address) is not configured. To use a snooping querier, an address must be explicitly configured globally or for the VLAN.

The switch does not define a default global querier address.

The no ip igmp snooping querier address and default ip igmp snooping querier address commands remove the global querier address command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier address ipv4_address

no ip igmp snooping querier address

default ip igmp snooping querier address

Parameter

ipv4_address source IPv4 address.

Example

This command sets the source IP address to 10.1.1.41 for query packets transmitted from the switch.
switch(config)# ip igmp snooping querier address 10.1.1.41
switch(config)#

ip igmp snooping querier last-member-query-count

The ip igmp snooping querier last-member-query-count command configures the global igmp snooping querier last member query count (LMQC) value. LMQC specifies the number of query messages the switch sends in response to group-specific or group-source-specific leave messages it receives from a host; the transmission frequency is specified by igmp snooping querier last member query count. The switch stops forwarding messages to the host if it does not receive a response to these query messages.

Setting LMQC to 1 causes the loss of one packet to stop traffic forwarding. While the switch can start forwarding traffic again after receiving a response to the next general query, the host may not receive that query for a period defined by ip igmp snooping querier query-interval.

VLANs use the global value when they are not assigned a value (ip igmp snooping vlan querier last-member-query-count). VLAN commands take precedence over the global value. The default global value is specified by the robustness variable (ip igmp snooping robustness-variable).

The no igmp snooping querier last-member-query-count and default igmp snooping querier last-member-query-count commands reset the LMQC to the default value by removing the corresponding ip igmp snooping querier last-member-query-count command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier last-member-query-count number

no ip igmp snooping querier last-member-query-count

default ip igmp snooping querier last-member-query-count

Parameter

number query message quantity. Value ranges from 1 to 3. Default is set by robustness-variable.

Example

This command configures the global last-member-query-count to 3.
switch(config)# ip igmp snooping querier last-member-query-count 3
switch(config)# show igmp snooping querier status
   Global IGMP Querier status
-------------------------------------------------------
admin state                      : Disabled
source IP address                : 0.0.0.0
query-interval (sec)             : 125.0
max-response-time (sec)          : 10.0
querier timeout (sec)            : 255.0
last-member-query-interval (sec) : 1.0
last-member-query-count          : 3
startup-query-interval (sec)     : 31.25 (query-interval/4)
startup-query-count              : 2 (robustness)

Vlan Admin    IP              Query    Response Querier Operational Ver
     State                    Interval Time     Timeout State
-----------------------------------------------------------------------
1    Disabled 0.0.0.0         125.0    10.0     255.0   Non-Querier v2
100  Disabled 0.0.0.0         125.0    10.0     255.0   Non-Querier v2
101  Disabled 0.0.0.0         125.0    10.0     255.0   Non-Querier v2
switch(config)#

ip igmp snooping querier last-member-query-interval

The ip igmp snooping querier last-member-query-interval command sets the global IGMP snooping last member query interval. The default interval is 1 second.

A multicast host sends an IGMP leave report when it leaves a group. To determine if the host was the last group member, the leave message recipient sends an IGMP query. The last-member-query-interval determines when the group record is deleted if no subsequent reports are received.

VLANs not assigned a last-member-query-interval value (ip igmp snooping vlan querier last-member-query-interval) use the global value. VLAN commands take precedence over the global value.

The no ip igmp snooping querier last-member-query-interval and default ip igmp snooping querier last-member-query-interval commands reset the last-member-query-interval value the default interval of one second by removing the ip igmp snooping querier last-member-query-interval statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier last-member-query-interval period

no ip igmp snooping querier last-member-query-interval

default ip igmp snooping querier last-member-query-interval

Parameter

period last member query interval (seconds). Value ranges from 1 to 25. Default is 1 second.

Related Commands

ip igmp snooping vlan querier last-member-query-interval assign a last member query interval value to the specified VLANs.

Example

This command sets the IGMP snooping querier last-member-query-interval to 5 seconds.
switch(config)# ip igmp snooping querier last-member-query-interval 5
switch(config)#

ip igmp snooping querier max-response-time

The ip igmp snooping querier max-response-time command specifies the global max-response-time value. The switch uses max-response-time to set the Max Response Time field in outbound Membership Query messages. Max Response Time specifies the maximum period a recipient can wait before responding with a Membership Report.

VLANs not assigned a max-response-time value (ip igmp snooping vlan querier max-response-time) use the global value. VLAN commands take precedence over the global value.

Values range from 1 to 25 seconds. The default global value is 10 seconds.

The no ip igmp snooping querier max-response-time and default ip igmp snooping querier max-response-time commands restore the global max-response-time default value by removing the ip igmp snooping querier max-response-time statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier max-response-time resp_sec

no ip igmp snooping querier max-response-time

default ip igmp snooping querier max-response-time

Parameters

resp_sec max-response-time value (seconds). Values range from 1 to 25. Default (global) is 10.

Example

This command sets the global max-response-time to 15 seconds.
switch(config)# ip igmp snooping querier max-response-time 15
switch(config)#

ip igmp snooping querier query-interval

The ip igmp snooping querier query-interval command sets the global query interval. This command also sets the query-interval of IGMP Snooping when using IGMP version 2. Values range from 5 to 3600 seconds. The default global value is 125 seconds. The query interval is the period between IGMP Membership Query messages sent from the querier. The global value specifies the query interval for VLANs with no query-interval command.

VLANs not assigned a query interval value (ip igmp snooping vlan querier query-interval) use the global value. VLAN commands take precedence over the global value.

The no ip igmp snooping querier query-interval and default ip igmp snooping querier query-interval commands reset the global query-interval value to 125 seconds by removing the ip igmp snooping querier query-interval statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier query-interval query_sec

no ip igmp snooping querier query-interval

default ip igmp snooping querier query-interval

Parameter

query_sec query interval (seconds). Values range from 5 to 3600. Default (global) is 125.

Example

This command sets the global query interval to 150 seconds.
switch(config)# ip igmp snooping querier query-interval 150
switch(config)#

ip igmp snooping querier startup-query-count

The ip igmp snooping querier startup-query-count command configures the global startup query count value. The startup query count specifies the number of query messages that the querier sends on a VLAN during the startup query interval ( ip igmp snooping querier startup-query-interval).

When snooping is enabled, the group state is more quickly established by sending query messages at a higher frequency. The startup-query-interval and startup-query-count parameters define the startup period by defining the number of queries to be sent and transmission frequency for these messages.

VLANs use the global startup query count value when they are not assigned a value (ip igmp snooping vlan querier startup-query-count). VLAN commands take precedence over the global value. The default global value is specified by the robustness variable (ip igmp snooping robustness-variable).

The no ip igmp snooping querier startup-query-count and default ip igmp snooping querier startup-query-count commands restore the default startup-query-count value by removing the corresponding ip igmp snooping querier startup-query-count command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier startup-query-count number

no ip igmp snooping querier startup-query-count

default ip igmp snooping querier startup-query-count

Parameter

number global startup query count. Value ranges from 1 to 3.

Example

These commands configure the global startup query count value of 2, then displays the status of the snooping querier.
switch(config)# ip igmp snooping querier startup-query-count 2
switch(config)# show igmp snooping querier status
   Global IGMP Querier status
-------------------------------------------------------
admin state                      : Disabled
source IP address                : 0.0.0.0
query-interval (sec)             : 125.0
max-response-time (sec)          : 10.0
querier timeout (sec)            : 255.0
last-member-query-interval (sec) : 1.0
last-member-query-count          : 2 (robustness)
startup-query-interval (sec)     : 31.25 (query-interval/4)
startup-query-count              : 2

Vlan Admin    IP              Query    Response Querier Operational Ver
     State                    Interval Time     Timeout State
-----------------------------------------------------------------------
1    Disabled 0.0.0.0         125.0    10.0     255.0   Non-Querier v2
100  Disabled 0.0.0.0         125.0    10.0     255.0   Non-Querier v2
101  Disabled 0.0.0.0         125.0    10.0     255.0   Non-Querier v2
switch(config)#

ip igmp snooping querier startup-query-interval

The ip igmp snooping querier startup-query-interval command configures the global startup query interval value. The startup query interval specifies the period between query messages that the querier sends upon startup.

When snooping is enabled, the group state is more quickly established by sending query messages at a higher frequency. The startup-query-interval and startup-query-count parameters define the startup period by defining the number of queries to be sent and transmission frequency for these messages.

VLANs use the global startup query interval value when they are not assigned a value (ip igmp snooping vlan querier startup-query-interval). VLAN commands take precedence over the global value. The default global value equals the query interval divded by four. (ip igmp snooping querier query-interval).

The no ip igmp snooping querier startup-query-interval and default ip igmp snooping querier startup-query-interval commands restore the default method of specifying the startup query interval by removing the corresponding ip igmp snooping querier startup-query-interval command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier startup-query-interval period

no ip igmp snooping querier startup-query-count

default ip igmp snooping querier startup-query-count

Parameter

period startup query interval (seconds). Value ranges from 1 to 3600 (1 hour).

Example

This command configures the startup query count of one minute for interface vlan 4.
switch(config)# ip igmp snooping querier startup-query-interval 40
switch(config)# show igmp snooping querier status
   Global IGMP Querier status
-------------------------------------------------------
admin state                      : Enabled
source IP address                : 0.0.0.0
query-interval (sec)             : 125.0
max-response-time (sec)          : 10.0
querier timeout (sec)            : 255.0
last-member-query-interval (sec) : 1.0
last-member-query-count          : 2 (robustness)
startup-query-interval (sec)     : 40.0
startup-query-count              : 2

Vlan Admin    IP              Query    Response Querier Operational Ver
     State                    Interval Time     Timeout State
-----------------------------------------------------------------------
1    Enabled  0.0.0.0         125.0    10.0     255.0   Non-Querier v3
100  Enabled  0.0.0.0         125.0    10.0     255.0   Non-Querier v3
101  Enabled  0.0.0.0         125.0    10.0     255.0   Non-Querier v3
switch(config)#

ip igmp snooping querier version

The ip igmp snooping querier version command configures the Internet Group Management Protocol (IGMP) snooping querier version on the configuration mode interfaces. Version 3 is the default IGMP version.

IGMP is enabled by the pim ipv4 sparse-mode or pim ipv4 bidirectional command. The ig igmp snooping querier version command does not affect the IGMP enabled status.

The no ip igmp snooping querier version and default ip igmp snooping querier version commands restore the configuration mode to IGMP version 3 by removing the ip igmp snooping querier version statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping querier version version_number

no ip igmp snooping querier startup-query-count

default ip igmp snooping querier startup-query-count

Parameter

version_number IGMP version number. Value ranges from 1 to 3. Default value is 3.

Examples
  • This command configures IGMP snooping querier version 2.
    switch(config)# ip igmp snooping querier version 2
switch(config)#
This command restores the IGMP snooping querier to version 3.
switch(config)# no ip igmp snooping querier version 
switch(config)#

ip igmp snooping report-flooding

The ip igmp snooping report-flooding command globally enables L2 report flooding on the switch. When report flooding is globally enabled, the ip igmp snooping vlan report-flooding configures a VLAN range to forward membership report messages to specified ports. When report flooding is not globally enabled, L2 report flooding cannot be enabled on individual VLANs.

L2 report flooding is an IGMP snooping feature that forwards membership report messages to specified ports. Relying on a single switch to maintain and send report messages can result in performance issues. L2 report flooding addresses this by facilitating report message transmissions through any network port. This allows switches to bypass the querier when forwarding multicast traffic to its interested ports.

The no ip igmp snooping report-flooding and default ip igmp snooping report-flooding commands disable global L2 report flooding by removing ip igmp report flooding from running-config. L2 report flooding is disabled by default.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping report-flooding

no ip igmp snooping report-flooding

default ip igmp snooping report-flooding

Related Command

ip igmp snooping vlan report-flooding enables L2 report flooding on a specified VLAN range.

Example

This command globally enables the snooping L2 report-flooding.
switch(config)# ip igmp snooping report-flooding
switch(config)#

ip igmp snooping report-flooding switch-port

The ip igmp snooping report-flooding switch-port command specifies Ethernet ports or port channels that can forward IGMP membership report messages for all VLANs where L2 report flooding is enabled. Ports that are connected to multicast routers or queriers continue to forward traffic as previously specified and are not affected by L2 report flooding commands.

L2 report flooding is an IGMP snooping feature that forwards membership report messages to specified ports. The ip igmp snooping vlan report-flooding switch-port command configures a list of forwarding ports for a specified VLAN range.

The no ip igmp snooping report-flooding switch-port and default ip igmp snooping report-flooding switch-port commands remove the specified ports from the global report flooding port list by deleting the corresponding ip igmp snooping report-flooding switch-port command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping report-flooding switch-port INTERFACE

no ip igmp snooping report-flooding switch-port INTERFACE

default ip igmp snooping report-flooding switch-port INTERFACE

Parameters

INTERFACE Membership report message forwarding is enabled on these ports:
  • ethernet e_rangewhere e_range is the number, range, or list of ethernet ports.
  • port-channel p_range where p_range is the number, range, or list of channel ports.
Related Commands

Example

This command configures Ethernet ports 7-9 for report message forwarding for any VLAN where L2 report flooding is enabled.
switch(config)# ip igmp snooping report-flooding switch-port ethernet 7-9
switch(config)#

ip igmp snooping restart query-interval

The ip igmp snooping restart query-interval command sets the query interval for all VLANs during an IGMP snooping restart. By default, the query interval during an IGMP snooping restart is a VLAN configured query interval divided by five. This accelerates the transmission of robustness queries to establish the IGMP snooping state more quickly. However, some large scale configurations may not be able to process all of the queries at this query interval rate. The restart query interval, when configured, is valid for all VLANs.

The no ip igmp snooping resrtart query-interval and default ip igmp snooping restart query-interval commands removes the global restart query interval by deleting the ip igmp snooping restart query-interval statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping restart query-interval query_sec

no ip igmp snooping restart query-interval

default ip igmp snooping restart query-interval

Parameter

query_sec query interval (seconds). Values range from 2 to 400. Default (global) is 125.

Example

This command sets the global query interval to 35 seconds.
switch(config)# ip igmp snooping restart query-interval 35
switch(config)#

ip igmp snooping robustness-variable

The ip igmp snooping robustness-variable command configures the robustness variable for snooping packets sent from any VLAN.

The robustness variable specifies the number of unacknowledged snooping queries that a switch sends before removing the recipient from the group list.

The no ip igmp snooping robustness-variable and default ip igmp snooping robustness-variable commands reset the robustness variable to 2 by removing the ip igmp snooping robustness-variable command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping robustness-variable robust_value

no ip igmp snooping robustness-variable

default ip igmp snooping robustness-variable

Parameter

robust_value robustness variable. Values range from 1 to 3. Default is 2.

Example

This command sets the robustness-variable value to 3.
switch(config)# ip igmp snooping robustness-variable 3
switch(config)#

ip igmp snooping vlan

The ip igmp snooping vlan command enables snooping on the specified VLANs if snooping is globally enabled. IGMP snooping is globally enabled by default. The ip igmp snooping command enables snooping globally.

Note that if IGMP snooping is enabled, QoS will not apply to IGMP packets.

The no ip igmp snooping vlan command disables snooping on the specified VLANs.

The default ip igmp snooping vlan command returns the snooping setting for the specified VLANs to enabled by removing the corresponding ip igmp snooping vlan command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range

no ip igmp snooping vlan v_range

default ip igmp snooping vlan v_range

Parameter

v_range VLANs upon which snooping is enabled. Formats include a number, a number range, or a comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.

Example

This command disables snooping on vlan 2, vlan 3, and vlan 4.
switch(config)# no ip igmp snooping vlan 2-4
switch(config)#

ip igmp snooping vlan fast-leave

The ip igmp snooping vlan fast-leave command enables fast-leave processing on specified VLANs. When fast-leave processing is enabled, the removal of a VLAN interface's multicast group entry from the IGMP table is not preceded by an IGMP group-specific query to the interface. The switch removes an interface from the forwarding table when it detects an IGMP leave message on the interface. IGMP fast-leave processing is enabled on all VLANs by default.

The no ip igmp snooping vlan fast-leave command disables fast-leave processing on the specified VLANs. The default ip igmp snooping vlan fast-leave command restores fast-leave processing on the specified VLANs by removing the corresponding no ip igmp snooping vlan fast-leave statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range fast-leave

no ip igmp snooping vlan v_range fast-leave

default ip igmp snooping vlan v_range fast-leave

Parameter

v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.

Example

This command enables IGMP fast-leave processing on vlan 10.
switch(config)# ip igmp snooping vlan 10 fast-leave
switch(config)#

ip igmp snooping vlan max-groups

The ip igmp snooping vlan max-groups command configures the quantity of multicast groups that the specified VLAN forwarding table can contain. After the limit is reached, attempts to join new groups are ignored. There is no default limit.

The no ip igmp snooping vlan max-groups and default ip igmp snooping vlan max-groups removes the maximum group limit by deleting the ip igmp snooping vlan max-groups statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range max-groups quantity

no ip igmp snooping vlan v_range max-groups

default ip igmp snooping vlan v_rangemax-groups

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • quantity maximum number of groups that can access the VLAN. Value ranges from 0 to 65534.
Examples
  • This command limits the number of multicast groups that hosts on vlan 6 can simultaneously access to 25.
    switch(config)# ip igmp snooping vlan 6 max-groups 25
switch(config)#
  • This command allows each VLAN between 8 and 15 to receive multicast packets from 30 groups.
    switch(config)# ip igmp snooping vlan 8-15 max-groups 30
switch(config)#
  • This command removes the maximum group restriction from all VLAN interfaces between 1 and 50.
    switch(config)# no ip igmp snooping vlan 1-50 max-groups
switch(config)#

ip igmp snooping vlan member

The ip igmp snooping vlan member command adds ports as static members to a multicast group. The ports must be in the specified VLAN range.

The no ip igmp snooping vlan member and default ip igmp snooping vlan member commands remove the specified ports from the multicast group by deleting the corresponding ip igmp snooping member statements from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_num member ipv4_addr interface STATIC_INT

no ip igmp snooping vlan v_num member ipv4_addr interface STATIC_INT

default ip igmp snooping vlan v_num member ipv4_addr interface STATIC_INT

Parameters
  • v_num VLAN number. Value ranges from 1 to 4094.
  • ipv4_addr multicast group IPv4 address.
  • STATIC_INT interface the command configures as the static group member. Options include:
    • ethernet e_range, where e_range is the number, range, or list of Ethernet ports.
    • port-channel p_range, where p_range is the number, range, or list of channel ports.

Example

This command configures the static connection to a multicast group at 237.2.1.4 through interface ethernet 3.
switch(config)# ip igmp snooping vlan 7 member 237.2.1.4 interface ethernet 3
switch(config)#

ip igmp snooping vlan multicast-router

The ip igmp snooping vlan multicast-router command adds a multicast router as a static port to the specified VLANs. The router port must be in the specified VLAN range.

Snooping may not always be able to locate the IGMP querier. This command should specify IGMP queriers that are known to connect to the network through a port on the switch.

The no ip igmp snooping vlan multicast-router and default ip igmp snooping vlan multicast-router commands remove the specified static port configuration by deleting the corresponding ip igmp snooping vlan multicast-router command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range multicast-router interface STATIC_INT

no ip igmp snooping vlan v_range multicast-router interface STATIC_INT

default ip igmp snooping vlan v_range multicast-router interface STATIC_INT

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • STATIC_INT interface the command configures as a static port. Selection options include:
    • ethernet e_range where e_range is the number, range, or list of ethernet ports.
    • port-channel p_range where p_range is the number, range, or list of channel ports.
  • The STATIC_INT interface must route traffic through a VLAN specified within v_range.

Example

This command configures the static connection to a multicast router through interface ethernet 3.
switch(config)# ip igmp snooping vlan 2 multicast-router interface ethernet 3
switch(config)#

ip igmp snooping vlan proxy

The ip igmp snooping vlan proxy command enables snooping proxy on individual VLAN. To enable or disable IGMP snooping vlan proxy globally, use the ip igmp snooping proxy command.

Note: The ip igmp snooping proxy command enables snooping proxy on all VLANs only where IGMP snooping is enabled.

The no and default form of ip igmp snooping vlan proxy command disables snooping proxy globally and on individual VLANs by removing the ip igmp snooping vlan proxy command from the running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan [ID | range]proxy

no ip igmp snooping vlan [ID | range] proxy

default ip igmp snooping vlan [ID | range] proxy

Parameters
  • ID specifies a individual VLAN ID. Numbers range from 1 to 4094.
  • range specifies the range of VLAN IDs. Numbers range from 1 to 4094.
Examples
  • This command globally enables IGMP snooping proxy on the switch and on all VLANs where IGMP snooping is enabled.
    switch(config)# ip igmp snooping proxy
switch(config)#
  • This command enables IGMP snooping proxy on vlan 20.
    switch(config)# ip igmp snooping vlan 20 proxy
switch(config)#
  • This command disables IGMP snooping proxy on vlan 20.
    switch(config)# no ip igmp snooping vlan 20 proxy
switch(config)#

ip igmp snooping vlan querier

The ip igmp snooping vlan querier command controls the querier for the specified VLANs. VLANs follow the global querier setting unless overridden by one of these commands:
  • ip igmp snooping vlan querier enables the querier on specified VLANs.
  • no ip igmp snooping vlan querier disables the querier on specified VLANs.

VLAN querier commands take precedence over the global querier setting. The ip igmp snooping querier controls the querier for VLANs with no snooping querier command.

The IGMP snooping querier supports snooping by sending Layer 2 membership queries to hosts attached to the switch. The snooping querier is functional on VLANs where hosts receive IP multicast traffic without access to a network IP multicast router. A snooping querier avoids flooding multicast packets in the VLAN by querying for hosts and routers.

The IGMP snooping querier is functional on VLANs that meet these criteria:
  • Snooping is enabled.
  • The corresponding SVI (VLAN interface) is active.
  • The VLAN querier IP address or the global querier IP address is configured.

The default ip igmp snooping vlan querier command restores the usage of the global setting for the specified VLAN by removing the corresponding ip igmp snooping vlan querier or no ip igmp snooping vlan querier command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier

no ip igmp snooping vlan v_range querier

default ip igmp snooping vlan v_range querier

Parameters

v_range VLAN IDs. Formats include a number, a number range, or a comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.

Examples
  • These commands globally enable the snooping querier on the switch, explicitly disable snooping on VLANs 1-3, and explicitly enable snooping on VLANs 4-6.
    switch(config)# ip igmp snooping querier
switch(config)# no ip igmp snooping vlan 1-3 querier
switch(config)# ip igmp snooping vlan 4-6 querier

    After running these commands, the running-config file contains these lines, which indicate that the snooping querier is enabled on VLANs 4-6.

    switch(config)# show running-config

                <-------OUTPUT OMITTED FROM EXAMPLE-------->
no ip igmp snooping vlan 1 querier
no ip igmp snooping vlan 2 querier
no ip igmp snooping vlan 3 querier
ip igmp snooping vlan 4 querier
ip igmp snooping vlan 5 querier
ip igmp snooping vlan 6 querier
ip igmp snooping querier
<-------OUTPUT OMITTED FROM EXAMPLE-------->
  • This command removes the querier setting for VLANs 2-5: 
    switch(config)# default ip igmp snooping vlan 2-5 querier

    When executed after the previous commands, the snooping querier is disabled explicitly on VLANs 1-2, enabled implicitly on VLANs 3-6, and enabled explicitly on VLANs 7-8, as shown by running-config:

    
                <-------OUTPUT OMITTED FROM EXAMPLE-------->
no ip igmp snooping vlan 1 querier
ip igmp snooping vlan 6 querier
ip igmp snooping querier
                <-------OUTPUT OMITTED FROM EXAMPLE-------->
  • This command sets the global snooping querier to disabled by removing the global querier setting from running-config:
    switch(config)# no ip igmp snooping querier
switch(config)#
    When executed after the previous commands, the snooping querier is disabled explicitly on VLANs 1-2, disabled implicitly on VLANs 3-6 and enabled explicitly on VLANs 7-8, as shown by running-config.
           <-------OUTPUT OMITTED FROM EXAMPLE-------->
no ip igmp snooping vlan 1 querier
ip igmp snooping vlan 6 querier
                <-------OUTPUT OMITTED FROM EXAMPLE-------->

ip igmp snooping vlan querier address

The ip igmp snooping vlan querier address command sets the source address for query packets sent from specified VLANs. VLANs not assigned an address use the global address (ip igmp snooping querier address). VLAN querier address commands take precedence over the global address.

To use a snooping querier, an address must be explicitly configured globally or for the querier VLAN.

The no ip igmp vlan snooping querier address and default ip igmp snooping vlan querier address commands reset the specified VLAN to use the global address by removing the corresponding ip igmp snooping vlan querier address command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier address ipv4_address

no ip igmp snooping vlan v_range querier address

default ip igmp snooping vlan v_range querier address

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • ipv4_address source IPv4 address.

Example

This command sets the source IPv4 address of 10.14.1.1. for query packets transmitted from vlan 2.
switch(config)# ip igmp snooping vlan 2 querier address 10.14.1.1
switch(config)#

ip igmp snooping vlan querier last-member-query-count

The ip igmp snooping vlan querier last-member-query-count command specifies an IGMP snooping querier last-member-query-count (LMQC) value for the specified VLANs. LMQC specifies the number of query messages the switch sends in response to group-specific or group-source-specific leave messages it receives from a host; the transmission frequency is specified by IGMP snooping querier last member query interval. The switch stops forwarding messages to the host if it does not receive a response to these query messages.

VLANs not assigned an LMQC value use the global value (ip igmp snooping querier last-member-query-count). VLAN commands take precedence over the global command.

Setting the last member query count (LMQC) to 1 causes the loss of a single packet to stop traffic forwarding. While the switch can start forwarding traffic again after receiving a response to the next general query, the host may not receive that query for a period defined by ip igmp snooping querier query-interval l.

The no igmp snooping vlan querier last-member-query-count and default igmp snooping vlan querier last-member-query-count commands reset the specified VLAN to use the global LMQC by removing the corresponding ip igmp snooping vlan querier last-member-query-count command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier last-member-query-count number

no ip igmp snooping vlan v_range querier address

default ip igmp snooping vlan v_range querier address

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • number query message quantity. Value ranges from 1 to 3.

Example

This command configures the last-member-query-count to 1 on vlan 3.
switch(config)# ip igmp snooping vlan 3 querier last-member-query-count 1
switch(config)#

ip igmp snooping vlan querier last-member-query-interval

The ip igmp snooping vlan querier last-member-query-interval command configures last-member-query-interval for packets sent from the specified VLANs. VLANs not assigned a value use the global setting (ip igmp snooping querier last-member-query-interval). VLAN commands take precedence over the global value. The global default is one second.

A multicast host sends an IGMP leave report when it leaves a group. To determine if the host was the last group member, the leave message recipient sends an IGMP query. The last-member-query-interval determines when the group record is deleted if no subsequent reports are received.

The no ip igmp snooping vlan querier last-member-query-interval and default ip igmp snooping vlan querier last-member-query-interval commands reset the specified VLAN to use the global last-member-query-interval by removing the corresponding ip igmp snooping vlan querier last-member-query-interval command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier last-member-query-interval period

no ip igmp snooping vlan v_range querier last-member-query-interval

default ip igmp snooping vlan v_range querier last-member-query-interval

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • period last member query interval (seconds). Value ranges from 1 to 25.

Example

This command sets the last-member-query-interval for vlan 10 to 12 seconds.
switch(config)# ip igmp snooping vlan 10 querier last-member-query-interval 12
switch(config)#

ip igmp snooping vlan querier max-response-time

The ip igmp snooping vlan querier max-response-time command configures max-response-time for packets sent from the specified VLANs. VLANs not assigned a value use the global setting (ip igmp snooping querier max-response-time). VLAN commands take precedence over the global value. The global default is 10 seconds.

switches use max-response-time to set the Max Response Time field in outbound Membership Query messages. Max Response Time specifies the maximum period a recipient can wait before responding with a Membership Report.

The no ip igmp snooping vlan querier max-response-time and default ip igmp snooping vlan querier max-response-time commands reset the specified VLAN to use the global max-response-time by removing the corresponding ip igmp snooping vlan querier max-response-time command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier max-response-time resp_sec

no ip igmp snooping vlan v_range querier max-response-time

default ip igmp snooping vlan v_range querier max-response-time

Parameters
  • v_range VLAN ID. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • resp_sec max-response-time value (seconds). Values range from 1 to 25.

Example

This command sets the max-response-time for vlan 2 to 5 seconds.
switch(config)# ip igmp snooping vlan 2 querier max-response-time 5
switch(config)#

ip igmp snooping vlan querier query-interval

The ip igmp snooping vlan querier query-interval command sets the query interval for the specified VLAN. VLANs not assigned a value use the global value (ip igmp snooping querier query-interval). VLAN commands have precedence over the global value. The query interval is the period between IGMP Membership Query messages sent from the querier.

The no ip igmp snooping vlan querier query-interval and default ip igmp snooping vlan querier query-interval commands reset the specified VLAN to use the global value by removing the corresponding ip igmp snooping vlan querier query-interval command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier query-interval query_sec

no ip igmp snooping vlan v_range querier query-interval

default ip igmp snooping vlan v_range querier query-interval

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • query_sec query interval (seconds). Values range from 5 to 3600. Default (global) is 125.

Example

This command sets the query interval for vlan 10 to 240 seconds.
switch(config)# ip igmp snooping vlan 10 querier query-interval 240
switch(config)#

ip igmp snooping vlan querier startup-query-count

The ip igmp snooping vlan querier startup-query-count command specifies the startup query count value for the specified VLANs. The startup query count specifies the number of query messages that the querier sends on a VLAN during the startup query interval (ip igmp snooping vlan querier startup-query-interval).

When an interface starts running IGMP, it can establish the group state more quickly by sending query messages at a higher frequency. The startup-query-interval and startup-query-count parameters define the startup period and the query message transmission frequency during that period.

VLANs not assigned a startup query count value use the global value (ip igmp snooping querier startup-query-count). VLAN commands take precedence over the global command.

The no ip igmp snooping vlan querier startup-query-count and default ip igmp snooping vlan querier startup-query-count commands restore the default condition of using the global startup query count value by removing the corresponding ip igmp snooping vlan querier startup-query-count command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier startup-query-count number

no ip igmp snooping vlan v_range querier startup-query-count

default ip igmp snooping vlan v_range querier startup-query-count

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • number startup query count. Value ranges from 1 to 3.

Example

This command configures the startup query count of 3 for vlan 100.
switch(config)# ip igmp snooping vlan 100 querier startup-query-count 3
switch(config)#

ip igmp snooping vlan querier startup-query-interval

The ip igmp snooping vlan querier startup-query-interval command specifies the startup query interval value for the specified VLANs. The startup query interval specifies the period between query messages that the querier sends upon startup.

When snooping is enabled, the group state is more quickly established by sending query messages at a higher frequency. The startup-query-interval and startup-query-count parameters define the startup period by defining the number of queries to be sent and transmission frequency for these messages.

VLANs not assigned a startup query interval value use the global value (ip igmp snooping querier startup-query-count). VLAN commands take precedence over the global command.

The no ip igmp snooping vlan querier startup-query-interval and default ip igmp snooping vlan querier startup-query-interval commands restore the default condition of using the global startup query interval value by removing the corresponding ip igmp snooping vlan querier startup-query-interval command from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier startup-query-interval period

no ip igmp snooping vlan v_range querier startup-query-interval

default ip igmp snooping vlan v_range querier startup-query-interval

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • period startup query interval (seconds). Value ranges from 1 to 3600 (1 hour). Default is 31.

Example

This command configures the startup query count of 60 seconds for vlan 100.
switch(config)# ip igmp snooping vlan 100 querier startup-query-interval 60
switch(config)#

ip igmp snooping vlan querier version

The ip igmp snooping vlan querier version command configures the Internet Group Management Protocol (IGMP) snooping querier function on the VLAN. Version 3 is the default IGMP snooping version.

IGMP is enabled by the pim ipv4 sparse-mode or pim ipv4 bidirectional command. The ig igmp snooping vlan querier version command does not affect the IGMP enabled status.

The no ip igmp snooping vlan querier version and default ip igmp snooping vlan querier version commands restore the configuration mode interface to IGMP snooping VLAN querier version 3 by removing the ip igmp snooping vlan querier version statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range querier version version_number

no ip igmp snooping vlan v_range querier version

default ip igmp snooping vlan v_range querier version

Parameters
  • v_range VLAN ID. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • version_number IGMP version number. Value ranges from 1 to 3. Default value is 3.
Example
  • The example sets the querier to version 2 on vlan 5.
    switch(config)# ip igmp snooping vlan 5 querier version 2
switch(config)#
  • This command restores IGMP snooping querier version 3 to vlan 5.
    switch(config)# no ip igmp snooping vlan 5 querier version 
switch(config)#

ip igmp snooping vlan report-flooding

The ip igmp snooping vlan report-flooding command enables L2 report flooding on the specified VLANs if report flooding is globally enabled. When L2 report flooding is not globally enabled, this command has no effect. The ip igmp snooping report-flooding command globally enables L2 report flooding.

L2 report flooding is an IGMP snooping feature that forwards membership report messages to specified ports. Relying on a single switch to maintain and send report messages can degrade performance. L2 report flooding addresses this by facilitating report message forwarding through any network port. This allows switches to bypass the querier when forwarding multicast traffic to its interested ports.

Two commands specify the ports that forward reports:

The no ip igmp snooping vlan report-flooding and default ip igmp snooping vlan report-flooding commands disable L2 report flooding for the specified VLAN by removing the corresponding ip igmp snooping vlan report-flooding statement from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range report-flooding

no ip igmp snooping vlan v_range report-flooding

default ip igmp snooping vlan v_range report-flooding

Parameters

v_range VLAN IDs Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.

Related Commands

ip igmp snooping report-flooding globally enables L2 report flooding.

Example

These commands enable L2 report flooding globally and on VLANs 201 through 205.
switch(config)# ip igmp snooping report-flooding
switch(config)# ip igmp snooping vlan 201-205 report-flooding
switch(config)#

ip igmp snooping vlan report-flooding switch-port

The ip igmp snooping vlan report-flooding switch-port command configures Ethernet ports or port channels to forward IGMP membership report messages for a specified VLAN range where L2 report flooding is enabled. Ports that are connected to multicast routers or queriers continue to forward traffic as previously specified and are not affected by L2 report flooding commands.

L2 report flooding is an IGMP snooping feature that forwards membership report messages to specified ports. The ip igmp snooping report-flooding switch-port command configures a list of forwarding ports for all VLANs where L2 report flooding is enabled.

The no ip igmp snooping vlan report-flooding switch-port and default ip igmp snooping vlan report-flooding switch-port commands remove the listed ports from the specified report flooding port list by deleting the corresponding ip igmp snooping vlan report-flooding switch-port statements from running-config.

Command Mode

Global Configuration

Command Syntax

ip igmp snooping vlan v_range report-flooding switch-port INTERFACE

no ip igmp snooping vlan v_range report-flooding switch-port INTERFACE

default ip igmp snooping vlan v_rangereport-flooding switch-port INTERFACE

Parameters
  • v_range VLAN IDs. Formats include a number, number range, or comma-delimited list of numbers and ranges. Numbers range from 1 to 4094.
  • INTERFACE Membership report message forwarding is enabled on these ports:
    • ethernet e_range where e_range is the number, range, or list of ethernet ports.
    • port-channel p_range where p_range is the number, range, or list of channel ports.
Related Commands

Example

These commands globally enable L2 report flooding, enable flooding on VLANs 201 through 205, and specify Ethernet ports 8-10 as the report flooding port list for VLANS 201-205.
switch(config)# ip igmp snooping report-flooding
switch(config)# ip igmp snooping vlan 201-205 report-flooding
switch(config)# ip igmp snooping vlan 201-205 report-flooding switch-port ethernet 8-10
switch(config)#

ip igmp startup-query-count

The ip igmp startup-query-count command specifies the number of query messages that an interface sends during the startup interval defined by ip igmp startup-query-interval.

When an interface starts running IGMP, it can establish the group state more quickly by sending query messages at a higher frequency. The startup-query-interval and startup-query-count parameters define the startup period and the query message transmission frequency during that period.

The no ip igmp startup-query-count and default ip igmp startup-query-count commands restore the default startup-query-count value of 2 for the configuration mode interface by removing the corresponding ip igmp startup-query-count command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp startup-query-count number

no ip igmp startup-query-count

default ip igmp startup-query-count

Parameter

number quantity of queries. Values range from 1 to 65535. Default is 2.

Example

This command configures the startup query count of 10 for vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp startup-query-count 10
switch(config-if-Vl4)#

ip igmp startup-query-interval

The ip igmp startup-query-interval command specifies the configuration mode interface IGMP startup period, during which query messages are sent at an accelerated rate.

When an interface starts running IGMP, it can establish the group state quicker by sending query messages at a higher frequency. The startup-query-interval and startup-query-count parameters define the startup period and the query message transmission frequency during that period.

The no ip igmp startup-query-interval and default ip igmp startup-query-interval commands restore the configuration mode interface default IGMP startup-query-interval of 31 seconds by removing the corresponding ip igmp startup-query-interval command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp startup-query-interval period

no ip igmp startup-query-interval

default ip igmp startup-query-interval

Parameter

period startup query interval, in deciseconds. Value ranges from 10 (one second) to 317440 (8 hours, 49 minutes, 4 seconds). Default is 31 seconds.

Example

This command configures the startup query count of 600 deciseconds for vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp startup-query-interval 600
switch(config-if-Vl4)#

ip igmp static-group

The ip igmp static-group command configures the configuration mode interface as a static member of a specified multicast group. This allows the router to forward multicast group packets through the interface without otherwise appearing or acting as a group member. By default, static group memberships are not configured on any interfaces.

If the command includes a source address, only multicast group messages received from the specified host address are fast-switched. Otherwise, all multicast messages of the specified group are fast-switched.

Note: To become a static member of a multicast group, the switch must be the PIM Designated Router (DR) for the network. If it is not, you can use the pim ipv4 dr-priority command to make it the DR by configuring its PIM DR value to be the highest on the network.

The no ip igmp static-group and default ip igmp static-group commands remove the configuration mode interface group membership by removing the corresponding ip igmp static-group command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp static-group group_address [SOURCE_ADDRESS]

no ip igmp static-group group_address [SOURCE_ADDRESS]

default ip igmp static-group group_address [SOURCE_ADDRESS]

Parameters
  • group_address IPv4 address of multicast group for which the interface fast-switches packets.
  • SOURCE_ADDRESS IP address of host that originates multicast data packets.
    • no parameter all multicast messages of the specified group are fast-switched.
    • ipv4_address source IP address (dotted decimal notation).
Related Commands
  • ip igmp static-group acl configures the configuration mode interface as a static member of the multicast groups specified by an IP access Control List (ACL).
  • ip igmp static-group range configures the configuration mode interface as a static member of multicast groups specified by an address range.

    One ip igmp static-group range command is equivalent to multiple ip igmp static-group commands.

Example

These commands configure interface vlan 15 as the PIM designated router, then configure it as a static member of the multicast group at address 231.1.1.15 for multicast data packets that originate at 10.1.1.1.
switch(config)# interface vlan 15
switch(config-if-Vl15)# pim ipv4 dr-priority 5000
switch(config-if-Vl15)# ip igmp static-group 231.1.1.45 10.1.1.1
switch(config-if-Vl15)#

ip igmp static-group acl

The ip igmp static-group acl command configures the configuration mode interface as a static member of the multicast groups specified by an IP access Control List (ACL). This command is a variant of the ip igmp static-group command that uses ACL rules to specify a set of source-multicast group address pairs instead of specifying a single pair. Multiple static-group ACLs can be assigned to an interface. Static groups can be assigned manually and through ACLs simultaneously.

access control lists that this command references must contain rules of the following format.
  • permit <protocol><source><destination>, where
    • <protocol> has no effect on the static group.
    • <source> address of host originating multicast data packets. Must be a host address.
    • <destination> multicast group IP address or subnet. Must be a valid multicast.

An ACL can contain multiple rules. An ACL can be applied to an interface only when all of its rules comply to the specified restrictions. The show ip igmp static-groups acl displays the source-multicast group pairs that the specified list configures and lists issues with illegal rules.

The no ip igmp static-group acl and default ip igmp static-group acl commands remove the specified static group ACL command from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp static-group acl list_name

no ip igmp static-group acl

default ip igmp static-group acl

Parameters

list_name ACL that specifies multicast group addresses for which interface fast-switches packets.

Example

This command configures vlan 4 as a static member of the multicast group specified by the ACL named LIST_1.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp static-group acl LIST_1
switch(config-if-Vl4)#

ip igmp static-group range

The ip igmp static-group range command configures the configuration mode interface as a static member of multicast groups specified by an address range. This allows the router to forward multicast group packets through the interface without otherwise appearing or acting as a group member. By default, no static group memberships are configured on interfaces.

This command is a variant of the ip igmp static-group command that allows the assignment of a subnet range of source addresses or a subnet range of multicast groups. A single ip igmp static-group range command is the equivalent of multiple ip igmp static-group commands, each of which can only assign a single multigroup-source pair to an interface. Running-config converts the range command to the equivalent list of ip igmp static-group commands.

If the command includes a source address range, only multicast group messages received from the range are fast-switched. Otherwise, all multicast messages of the specified group are fast-switched.

The no ip igmp static-group range and default ip igmp static-group range commands remove the specified range of static group statements from running-config. The no ip igmp static-group and default ip igmp static-group commands can remove an individual static-group command that was initially added to running-config by an ip igmp static-group range command.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp static-group range GROUP_ADDR[SOURCE_ADDR]

no ip igmp static-group range GROUP_ADDR[SOURCE_ADDR]

default ip igmp static-group range GROUP_ADDR[SOURCE_ADDR]

Parameters
  • GROUP_ADDR address of multicast group for which the interface fast-switches packets.
    • gp_ipv4_addr multicast group IPv4 address.
    • gp_ipv4_subnet IPv4 subnet address of multicast groups (CIDR or address-mask).
  • SOURCE_ADDR IP address of a host range that originates multicast data packets.
    • no parameter all multicast messages of the specified range are fast-switched.
    • source sr_ipv4_address source IPv4 address (dotted decimal notation).
    • source sr_ ipv4_subnet IPv4 subnet address of source hosts (CIDR or address- mask).
      Note: A command cannot specify a subnet address for both multicast group and source.
Examples
  • This command configures interface vlan 4 as a static member of the multicast group range 241.1.4.1/24 for data packets that originate at 10.1.1.1.
    switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp static-group range 239.1.4.1/24 source 10.1.1.1
switch(config-if-Vl4)#
  • This command attempts to configure interface vlan 4 as a static member of the multicast group range 241.1.4.1/24 for data packets that originate at the 10.1.1.1/29 subnet. Because the range and source cannot both be subnets, this command generates an error message.
    switch(config-if-Vl4)# ip igmp static-group range 239.1.1.1/29 source 16.1.1.1/29
% Error: cannot specify source range with group range
switch(config-if-Vl4)#

ip igmp version

The ip igmp version command configures the Internet Group Management Protocol (IGMP) version on the configuration mode interface. Version 3 is the default IGMP version.

IGMP is enabled by the pim ipv4 sparse-mode or pim ipv4 bidirectional command. The ig igmp version command does not affect the IGMP enabled status.

The no ip igmp version and default ip igmp version commands restore the configuration mode interface to IGMP version 3 by removing the ip igmp version statement from running-config.

Command Mode

Interface-Ethernet Configuration

Interface-Port-Channel Configuration

Interface-VLAN Configuration

Command Syntax

ip igmp version version_number

no ip igmp version

default ip igmp version

Parameters

version_number IGMP version number. Value ranges from 1 to 3.

Example

This command configures IGMP version 3 on interface vlan 4.
switch(config)# interface vlan 4
switch(config-if-Vl4)# ip igmp version 3
switch(config-if-Vl4)#

permit / deny

The permit command configures the configuration mode IGMP profile as a permit list. Applying a permit list to an interface restricts that interface from joining any multicast group not included in the list.

IGMP profiles are deny lists by default. When applied to an interface, a deny list allows the interface to join any multicast group that is not included in the list.

The deny command restores the IGMP list to its default type by removing the corresponding permit statement from running-config.

The range command adds and removes address ranges from the configuration mode profile.

Command Mode

IGMP-profile Configuration

Command Syntax

permit

deny

Related Commands

ip igmp profile places the switch in igmp-profile configuration mode.

Example

These commands enter igmp-profile configuration mode and configure the profile as permit list_1.
switch(config)# ip igmp profile list_1
switch(config-igmp-profile-list_1)# permit
switch(config-igmp-profile-list_1)#

range

The range command specifies an address range for the configuration mode IGMP profile. A permit range specifies the groups that an interface is permitted to join. A deny range specifies the groups that an interface is not permitted to join. The permit / deny command specifies the range type.

A profile may contain multiple range statements to define a discontiguous address range.

The no range and default range commands remove the specified address range from a previous specified list.

Command Mode

igmp-profile Configuration

Command Syntax

range init_address [UPPER_RANGE]

no range init_address [UPPER_RANGE]

default range init_address [UPPER_RANGE]

Parameters
  • init_address IP address of lower boundary of the address range (dotted decimal notation).
  • UPPER_RANGE sets the upper boundary of the address range. Options include:
    • no parameter upper boundary is equal to lower boundary: range consists of one address.
    • range_address IP address of upper boundary.

      All addresses must be multicast addresses (10.0.0.0 to 239.255.255.255).

Related Commands

ip igmp profile places the switch in the igmp-profile configuration mode.

Example

These commands enter the igmp-profile configuration mode, configure the profile as a permit list, and define the permit address list of 232.1.1.0 to 232.1.1.255 and 233.1.1.10.
switch(config)# ip igmp profile list_1
switch(config-igmp-profile-list_1)# permit
switch(config-igmp-profile-list_1)# 232.1.1.0 232.1.1.255
switch(config-igmp-profile-list_1)# 233.1.1.10
switch(config-igmp-profile-list_1)# ip igmp profile

show igmp snooping querier

The show igmp snooping querier command displays snooping querier configuration and status information. Command provides options to only include specific VLANs.

Command Mode

EXEC

Command Syntax

show igmp snooping querier [STATUS][VLAN_ID][DATA]

Parameters
  • STATUS specifies the type of information displayed. Options include:
    • no parameter querier IP address, port, and IGMP version.
    • status querier configuration parameters.
  • VLAN_ID specifies VLANs for which command displays information. Options include:
    • no parameter all VLANs.
    • vlan v_num specified VLAN.
  • DATA specifies the type of information displayed. Options include:
    • no parameter displays VLAN number and port-list for each group.
    • detail displays port-specific data for each group; includes transmission times and expiration.
Examples
  • This command displays the querier IP address, version, and port servicing each VLAN.
    switch> show igmp snooping querier
Vlan  IP Address       Version  Port
----------------------------------------
1     172.17.0.37      v2       Po1
20    172.17.20.1      v2       Po1
26    172.17.26.1      v2       Cpu
2028  172.17.255.29    v2       Po1
switch>
  • This command displays the querier configuration parameters for each VLAN.
    switch> show igmp snooping querier status
   Global IGMP Querier status
------------------------------------
admin state              : Enabled
source IP address        : 0.0.0.0
query-interval (sec)     : 125.0
max-response-time (sec)  : 10.0
querier timeout (sec)    : 130.0

Vlan Admin    IP              Query    Response Querier Operational
     State                    Interval Time     Timeout State
-------------------------------------------------------------------
1    Enabled  0.0.0.0         125.0    10.0     130.0   Non-Querier
4    Enabled  0.0.0.0         125.0    10.0     130.0   Non-Querier
20   Enabled  0.0.0.0         125.0    10.0     130.0   Non-Querier
22   Enabled  0.0.0.0         125.0    10.0     130.0   Non-Querier
28   Enabled  0.0.0.0         125.0    10.0     130.0   Non-Querier

show igmp snooping querier counters

The show igmp snooping querier counters command displays the counters from the querier, as learned through Internet Group Management Protocol (IGMP).

Command Mode

EXEC

Command Syntax

show igmp snooping querier counters [VLAN_ID]

Parameters

VLAN_ID specifies VLANs for which command displays information. Options include:
  • no parameter displays information for all VLANs.
  • vlan v_num displays information for specified VLAN.

Example

This command displays the counters from the querier.
switch> show igmp snooping querier counters 
-----------------------------------------------------------------------
Vlan: 1    IP Addr: 100.0.0.1       Op State: Querier     Version:  v3

v1 General Queries Sent         :0
v1 Queries Received             :0
v1 Reports Received             :0
v2 General Queries Sent         :1
v2 Queries Received             :0
v2 Reports Received             :25
v2 Leaves Received              :0
v3 General Queries Sent         :655
v3 GSQ Queries Sent             :0
v3 GSSQ Queries Sent            :8
v3 Queries Received             :654
v3 Reports Received             :2385
Error Packets                   :0
Other Packets                   :0
switch>

show igmp snooping querier membership

The show igmp snooping querier membership command displays the membership from the querier, as learned through Internet Group Management Protocol (IGMP).

Command Mode

EXEC

Command Syntax

show igmp snooping querier membership [VLAN_ID [GROUP_LIST]]

Parameters
  • VLAN_ID specifies VLANs for which command displays information. Options include:
    • no parameter displays information for all VLANs.
    • vlan v_num displays information for specified VLAN.
  • GROUP_LIST list of groups for which the command displays information. Options include:
    • no parameter all multicast groups within specified VLAN.
    • group ipv4_addr single multicast group address (dotted decimal notation).

Example

This command displays the membership from the querier for vlan 1.
switch> show igmp snooping querier membership
-------------------------------------------------------------------------
Vlan: 1    Elected: 10.0.0.1       QQI: 125  QRV: 2  QRI: 10  GMI: 260 

Groups           Mode  Ver  Num of Sources                               
-------------------------------------------------------------------------
10.0.0.2        EX    v3   0 []
10.0.0.3        IN    v3   2 [ 3.3.3.3, 3.3.3.4 ]
10.0.0.4        EX    v3   0 []
10.0.0.13       EX    v3   0 []
10.0.0.22       EX    v3   0 []
10.0.0.1        IN    v3   3 [ 5.6.7.9, 5.6.7.8, ... ]
switch>

show ip igmp groups

The show ip igmp groups command displays multicast groups that have receivers directly connected to the switch, as learned through Internet Group Management Protocol (IGMP).
  • show ip igmp groups all multicast groups.
  • show ip igmp groups group_addr listed multicast group.
  • show ip igmp groups interface int_name all multicast groups on specified interfaces
  • show ip igmp groups group_addr interface int_name listed multicast group on specified interface.

Command Mode

EXEC

Command Syntax

show ip igmp groups GROUP_LIST [DATA]

Parameters
  • GROUP_LIST list of groups for which the command displays information. Options include:
    • no parameter all multicast groups.
    • group_addr single multicast group address (dotted decimal notation).
    • interface ethernet e_num all multicast groups on specified Ethernet interface.
    • interface loopback l_num all multicast groups on specified Loopback interface.
    • interface management m_num all multicast groups on specified Management interface.
    • interface port-channel p_num all multicast groups on specified Port-Channel Interface.
    • interface vlan v_num all multicast groups on specified VLAN interface.
    • interface VXLAN vx_num all multicast groups on specified VXLAN interface.
  • DATA specifies the type of information displayed. Options include:
    • no parameter provides uptime, expiration, and address of reporter.
    • detail also include group mode and group source list.

Example

This command displays multicast groups with receivers directly connected to the switch.
switch> show ip igmp groups
NOTE: static-group information not shown below.  Use the
      'show ip igmp static-groups' command.
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
10.12.1.1       Vlan162                  11d01h    00:02:57  172.17.2.110
10.12.1.2       Vlan162                  11d01h    00:02:57  172.17.2.110
10.12.1.3       Vlan162                  11d01h    00:02:57  172.17.2.110
10.12.1.4       Vlan162                  11d01h    00:02:57  172.17.2.110
10.12.1.5       Vlan162                  11d01h    00:02:57  172.17.2.110
switch>

show ip igmp groups count

The show ip igmp groups count command displays the number of multicast groups that are joined across the specified interfaces.

Command Mode

EXEC

Command Syntax

show ip igmp groups [GROUP_LIST] count

Parameters
  • INTERF Specifies the interface for which the command displays information. Options include:
    • no parameter all IGMP interfaces.
    • interface ethernet e_num Ethernet interface.
    • interface loopback l_num Loopback interface.
    • interface management m_num Management interface.
    • interface port-channel p_num Port-Channel Interface.
    • interface vlan v_num VLAN interface.
    • interface VXLAN vx_num VXLAN interface.
Examples
  • This command displays the number of multicast groups joined across all interfaces.
    switch> show ip igmp groups count
Number of total groups joined across all IGMP interfaces: 5
switch>
  • This command displays the number of multicast groups joined on interface ethernet 3/4.
    switch> show ip igmp groups interface ethernet 3/4 count
Number of groups joined on Ethernet3/4: 2
switch>

show ip igmp host-proxy config-sanity

The show ip igmp host-proxy config-sanity command displays diagnostic information about an IGMP host proxy configuration.

Command Mode

EXEC

Command Syntax

show ip igmp host-proxy config-sanity

Example

This command displays IGMP host proxy configuration diagnostic information.
switch> show ip igmp host-proxy config-sanity
Below are hints of potential IGMP Host-Proxy misconfigurations
IGMP host-proxy configured on interface Test3:
access-lists having "deny ip any any" rule:
acl1
acl2
Groups with overlapping permit and deny configurations:
192.168.1.1/32
192.168.2.2/32
192.168.4.4/32
Groups with source filters configured with IGMP Host-Proxy set to version 2 :
192.168.2.2/32
192.168.3.0/24
192.168.3.3/32
192.168.8.8/32
switch>

show ip igmp host-proxy interface

The show ip igmp host-proxy interface command displays per-interface IGMP host-proxy configuration information, including the IGMP groups joined on the interface. Command filters allow the list to display only data for a specified interface and to include packet counter statistics in the display.

Command Mode

EXEC

Command Syntax

show ip igmp host-proxy interface [interface] [detail]

Parameters
  • interface optional parameter to limit the display to a single interface. Omitting the parameter displays host-proxy configuration information for all interfaces on which IGMP host-proxy is configured. Options include:
    • ethernet e_num Ethernet interface specified by e_num.
    • port-channel p_num port-channel Interface specified by p_num.
    • vlan v_num VLAN interface specified by v_num.
  • detail use this optional keyword to include packet counter statistics in the display.
Examples
  • This command displays host-proxy information for all switch interfaces on which IGMP host-proxy is configured.
    switch> show ip igmp host-proxy interface
IGMP host-proxy configured on: Test2
IGMP host-proxy version: 3
Unsolicited-report interval: 1.0
Device name: Test2
Interface Group Address IncludeSrc ExcludeSrc
Test2 172.16.89.0
Test2 172.16.0.0 20.0.0.0
Test2 172.16.0.0 10.0.0.0
Test2 192.168.110.0 20.0.0.0
  • This command displays host-proxy information for all switch interfaces on which IGMP host-proxy is configured, plus host-proxy statistics.
    switch> show ip igmp host-proxy interface detail
IGMP host-proxy configured on: Test2
IGMP host-proxy version: 3
Unsolicited-report interval: 1.0
Device name: Test2
Interface Group Address IncludeSrc ExcludeSrc
Test2 172.16.89.0
Test2 172.16.0.0 20.0.0.0
Test2 172.16.0.0 10.0.0.0
Test2 192.168.110.0 20.0.0.0
IGMP host-proxy statistics:
IGMP v1 Queries received: 0
IGMP v2 General-Queries received: 0
IGMP v2 Group-Queries received: 0
IGMP v3 General-Queries received: 0
IGMP v3 Group-Queries received: 0
IGMP v3 Group-Source Queries received: 0
IGMP v1 Reports sent: 0
IGMP v2 Reports sent: 0
IGMP v3 Reports sent: 1

show ip igmp interface

The show ip igmp interface command displays multicast information about the specified interface.

Command Mode

EXEC

Command Syntax

show ip igmp interface [INT_NAME]

Parameters

INT_NAME Interface type and number. Values include:
  • no parameter Displays information for all interfaces.
  • ethernet e_num Ethernet interface specified by e_num.
  • loopback l_num Loopback interface specified by l_num.
  • management m_num Management interface specified by m_num.
  • port-channel p_num Port-Channel Interface specified by p_num.
  • vlan p_num VLAN interface specified by p_num.
  • VXLAN vx_num VXLAN interface specified by vx_num.

Example

This command displays multicast related information about vlan 26.
switch> show ip igmp interface vlan 26
Vlan26 is up
  Interface address: 172.17.26.1/23
  IGMP on this interface: enabled
  Multicast routing on this interface: enabled
  Multicast TTL threshold: 1
  Current IGMP router version: 2
  IGMP query interval: 125 seconds
  IGMP max query response time: 100 deciseconds
  Last member query response interval: 10 deciseconds
  Last member query response count: 2
  IGMP querier: 172.17.26.1
  Robustness: 2
  Require router alert: enabled
  Startup query interval: 312 deciseconds
  Startup query count: 2
  General query timer expiry: 00:00:22
  Multicast groups joined:
    239.255.255.250
switch>

show ip igmp profile

The show ip igmp profile command displays the contents of the specified IGMP profile. IGMP snooping filters use an IGMP profile to control the multicast groups that an interface can join.

Command Mode

EXEC

Command Syntax

show ip igmp profile [PROFILES]

Parameters

PROFILES IGMP profiles for which command displays contents. Options include:
  • no parameter displays all IGMP profiles.
  • profile_name displays specified profile.

Example

This command displays the IGMP profiles configured on the switch.
switch> show ip igmp profile
IGMP Profile list_1
permit
range 229.1.24.0 229.1.25.255
IGMP Profile list_2
deny
range 234.1.1.0 234.1.255.255
switch>

show ip igmp snooping

The show ip igmp snooping command displays the switch IGMP snooping configuration.

Command Mode

EXEC

Command Syntax

show ip igmp snooping [VLAN_ID]

Parameters

VLAN_ID specifies VLANs for which command displays information. Options include:
  • no parameter displays information for all VLANs.
  • vlan v_num displays information for specified VLAN.

Example

This command displays the switch IGMP snooping configuration.
switch> show ip igmp snooping
   Global IGMP Snooping configuration:
-------------------------------------------
IGMP snooping                  : Enabled
Robustness variable            : 2

Vlan 1 :
----------
IGMP snooping                  : Enabled
Multicast router learning mode : pim-dvmrp

Vlan 20 :
----------
IGMP snooping                  : Enabled
Multicast router learning mode : pim-dvmrp

Vlan 26 :
----------
IGMP snooping                  : Enabled
Multicast router learning mode : pim-dvmrp

Vlan 2028 :
----------
IGMP snooping                  : Enabled
Multicast router learning mode : pim-dvmrp
switch>

show ip igmp snooping counters

The show ip igmp snooping counters command displays the number of IGMP messages sent and received through each switch port. The display table sorts the messages by type.

Command Mode

EXEC

Command Syntax

show ip igmp snooping counters [DATA_TYPE][DATA_LEVEL]

Parameters
  • DATA_TYPE Information displayed by the command. Options include:
    • no parameter displays transmission counters.
    • errors displays error counters.
  • DATA_LEVEL specifies the type of information displayed. Options include:
    • no parameter number of packets on physical ports.
    • detail number of packets on physical ports.

Example

This command displays the number of messages received on each port.
switch> show ip igmp snooping counters
                       Input                  |            Output
Port   Queries Reports  Leaves  Others  Errors|Queries Reports  Leaves  Others
------------------------------------------------------------------------------
Cpu      15249  106599       4  269502       0   30242  102812     972    3625
Et1          0       0       0       0       0       0       0       0       0
Et2          0       6       1      26       0    5415       0       0     731
Et3          0   10905     222    1037       0   15246       0       0    1448
Et4          0   44475      21     288       0   15247       0       0    2199
Et5          0     355       0      39       0   15211       0       0    2446
Et6          0     475      13       0       0   15247       0       0    2487
Et7          0       0       0     151       0   15247       0       0    2336
Et8          0     578       6      75       0    2859       0       0     931
Et9          0       0       0      27       0   15247       0       0    2460
Et10         0   12523     345      54       0   15247       0       0    2433
Et11         0       0       0       0       0       0       0       0       0
Et12         0    4509      41      22       0   15247       0       0    2465
Et13         0     392      29     119       0   15247       0       0    2368
Et14         0      88       3       6       0   15247       0       0    2481
Et15         0   16779     556      72       0   15117       0       0      66
Et16         0    2484      13      66       0   15247       0       0    2421
Et17         0       0       0       0       0       0       0       0       0
Et18         0      20       6     160       0    3688       0       0     803
Et19         0    4110      17       0       0   15247       0       0    2487
Et20         0       0       0       0       0       0       0       0       0
Et21         0       0       0       0       0       0       0       0       0
Et22         0       0       0      52       0   15247       0       0    2435
Et23         0    5439     181     138       0   15247       0       0    2349
Et24         0    2251      21       4       0   15247       0       0    2483
Po1      45360  540670    8853  464900       0   15249  224751     618    2576
Po2          0  101399      58      17       0   15120       0       0    1121
switch       0       0       0       0       0       0       0       0       0

show ip igmp snooping counters ethdev-pams

The show ip igmp snooping counters command displays the number of dropped IGMP packets messages sent and received through each switch port at the kernel level. The display table sorts the messages by type.

Command Mode

EXEC

Command Syntax

show ip igmp snooping counters ethdev-pams

Example

This command displays the number of messages dropped at the kernel level.
switch> show ip igmp snooping counters ethdev-pams
  IntfName   rxErrors   txErrors    txDrops
       et9          1          0          0
      et18          1          0          0
     mlag9          1          0          0
     mlag8          1          0          0
      et17          1          0          0
       po1          1          0          0
       po2          1          0          0
      et15          1          0          0
       et6          1          0          0
    mlag10          1          0          0
      et16          1          0          0
     mlag7          1          0          0
      et11          1          0          0
     mlag5          1          0          0
     mlag4          1          0          0
       cpu          1          0          0
      et13          1          0          0
switch>

show ip igmp snooping groups

The show ip igmp snooping groups command displays IGMP snooping statistics. Available information includes the physical ports that send and receive information, the time when multicast data was originally and most recently heard on the ports, and the version number of the IGMP messages. Command provides options that restrict the output to specific VLANs, ports, and groups.

Command Mode

EXEC

Command Syntax

show ip igmp snooping groups proxy [VLAN_ID][PORT_INT][GROUPS][DATA local]

Parameters
  • VLAN_ID specifies VLAN for which command displays information. Options include:
    • no parameter displays information for all VLANs.
    • vlan v_num displays information for VLAN v_num (1 to 4094).
  • PORT_INT specifies physical ports for which command displays information. Options include:
    • no parameter displays information for all physical ports.
    • interface ethernet e_range, where e_range is the number, range, or list of Ethernet ports.
    • interface port-channel p_range, where p_range is the number, range, or list of channel ports.
  • GROUPS specifies the multicast groups. Options include:
    • no parameter all multicast groups on all specified ports.
    • mgroup_address multicast group specified by IPv4 address (dotted decimal notation).
    • dynamic multicast groups learned through IGMP.
    • user multicast groups manually added.
  • DATA specifies the type of information displayed. Options include:
    • no parameter VLAN number and port-list for each group.
    • detail port-specific information for each group, including transmission times and expiration.
  • proxy displays IGMP snooping proxy information.
  • local displays the overlay with locally attached receivers.
Examples
  • This command displays the port lists for all multicast groups.
    switch> show ip igmp snooping groups
Vlan  Group            Type     Version      Port-List
------------------------------------------------------------------------
-
1     239.255.255.250  -        -            Po1, Po2
26    239.255.255.250  -        -            Cpu, Et3, Et4, Et10, Et23,
                                             Et27
switch>
  • This command displays detailed port information of all multicast groups.
    switch> show ip igmp snooping groups detail
Vlan Group           IP              First     Last    Expire    Ver Filter Port
                                     Heard     Heard                 Mode
-------------------------------------------------------------------------------
-
1    239.255.255.250 172.17.3.73     2536:15   0:47    3:33      v2  0      Po2
1    239.255.255.250 172.17.0.37     31532:48  0:18    1:27      -   -      Po1
26   239.255.255.250 172.17.26.189   5:07      0:52    3:28      v2  0      Et3
26   239.255.255.250 172.17.26.182   17:34     3:02    1:18      v2  0      Et3
26   239.255.255.250 172.17.26.245   1046:47   0:57    3:23      v2  0      Et4
26   239.255.255.250 172.17.26.184   27:41     0:53    3:27      v2  0      Et10
26   239.255.255.250 172.17.26.161   9:16      0:56    3:24      v2  0      Et23
26   239.255.255.250 172.17.26.62    90:24     0:50    3:30      v2  0      Et27
26   239.255.255.250 172.17.26.1     31532:52  0:04    1:41      -   -      Cpu
switch>
  • This command displays the port lists for all dynamic multicast groups.
    switch> show ip igmp snooping groups dynamic
Vlan  Group            Type     Version    Port-List
----------------------------------------------------------------------
-
1     239.255.255.250  -        -          Po1, Po2
26    239.255.255.250  -        -          Cpu, Et3, Et4, Et10, Et23,
                                           Et27, Et34
switch>
  • This command displays the detailed port information for all dynamic multicast groups.
    switch> show ip igmp snooping groups dynamic detail
Vlan Group           IP              First     Last    Expire    Ver Filter Port
                                     Heard     Heard                 Mode
-------------------------------------------------------------------------------
-
1    239.255.255.250 172.17.3.73     2539:16   1:37    2:43      v2  0      Po2
1    239.255.255.250 172.17.0.37     31535:49  0:19    1:26      -   -      Po1
26   239.255.255.250 172.17.26.189   8:08      3:53    0:27      v2  0      Et3
26   239.255.255.250 172.17.26.182   20:35     1:49    2:31      v2  0      Et3
26   239.255.255.250 172.17.26.245   1049:48   1:46    2:34      v2  0      Et4
26   239.255.255.250 172.17.26.184   30:42     1:44    2:36      v2  0      Et10
26   239.255.255.250 172.17.26.161   12:17     3:57    0:23      v2  0      Et23
26   239.255.255.250 172.17.26.143   1:53      1:53    2:27      v2  0      Et23
26   239.255.255.250 172.17.26.62    93:25     1:48    2:32      v2  0      Et27
26   239.255.255.250 172.17.26.164   0:32      0:31    3:49      v2  0      Et34
26   239.255.255.250 172.17.26.1     31535:53  0:05    1:40      -   -      Cpu
switch>
  • This command displays the port lists for all static (user configured) multicast groups.
    switch> show ip igmp snooping groups user
Vlan  Group            Type     Version       Port-List
------------------------------------------------------------------------
-
1     239.255.255.250  -        -             Po1, Po2
26    239.255.255.250  -        -             Cpu, Et3, Et4, Et10, Et23,
                                              Et27, Et34
switch>
  • This command displays detailed port information for all user configured (static) multicast groups.
    switch> show ip igmp snooping groups user detail
Vlan Group           IP              First     Last    Expire    Ver Filter Port
                                     Heard     Heard                 Mode
-------------------------------------------------------------------------------
-
1    239.255.255.250 172.17.3.73     2539:50   0:06    4:14      v2  0      Po2
1    239.255.255.250 172.17.0.37     31536:23  0:23    1:22      -   -      Po1
26   239.255.255.250 172.17.26.182   21:09     0:21    3:59      v2  0      Et3
26   239.255.255.250 172.17.26.245   1050:22   0:17    4:03      v2  0      Et4
26   239.255.255.250 172.17.26.184   31:16     0:17    4:03      v2  0      Et10
26   239.255.255.250 172.17.26.161   12:51     0:17    4:03      v2  0      Et23
26   239.255.255.250 172.17.26.143   2:27      2:27    1:53      v2  0      Et23
26   239.255.255.250 172.17.26.62    93:59     0:22    3:58      v2  0      Et27
26   239.255.255.250 172.17.26.164   1:06      0:21    3:59      v2  0      Et34
26   239.255.255.250 172.17.26.1     31536:27  0:09    1:36      -   -      Cpu
switch>
  • This command displays detailed port information for multicast group 239.255.255.253 on vlan 10.
    switch> show ip igmp snooping groups vlan 10 239.255.255.253 detail
Vlan Group           IP              First     Last    Expire    Ver Filter Port
                                     Heard     Heard                 Mode
-------------------------------------------------------------------------------
-
10   239.255.255.253 10.255.255.246  7177:16   0:08    2:07      v2  0      Po7
10   239.255.255.253 10.255.255.247  7177:20   0:03    2:12      v2  0      Po7
10   239.255.255.253 10.255.255.248  7177:16   0:06    2:09      v2  0      Po7
10   239.255.255.253 10.255.255.254  7177:56   0:07    1:38      -   -      Cpu
switch>
  • This command displays the groups that is present in IGMP report when a query is received on any of the ports listed under port-list.
    switch> show ip igmp snooping groups proxy
Vlan      Group     Type     Port-List
-------------------------------------------------
10     225.0.0.1    Proxy   Cpu, Et4, Et6
10     225.2.2.2    Proxy   Cpu, Et3, Et4
10     225.3.3.3    Proxy   Cpu, Et3, Et4, Et6
  • This command displays all the information that is present in the IGMP report if a general IGMP query was received on Ethernet4.
    switch> show ip igmp snooping groups proxy interface Ethernet4 detail
Vlan     Interface     Group          Source/Filter Mode
---------------------------------------------------------
10       Ethernet4    225.0.0.1       Include
                                      150.227.112.250
                                      190.171.60.6
10       Ethernet4     225.2.2.2      Exclude
10       Ethernet4     225.3.3.3      Exclude
                                      150.227.112.250
  • This command displays groups in the overlay with locally attached receivers.
    switch> show ip igmp snooping groups local 
IGMP Snooping Group Membership
EX : Filter mode Exclude
IN : Filter mode Include
IR : Ingress Replication

VLAN  Group            Members
----  ---------------  -------------------------
10    227.1.1.1        Et1
10    *                Cpu
20    228.1.1.1        Et2
20    *                Cpu
30    227.1.1.1        Et3
30    *                Cpu
40    228.1.1.1        Et4
40    *                Cpu
Vlan     Interface     Group             Source/Filter Mode
-------------------------------------------------------------
10       Ethernet4    225.0.0.1          Include
                                         150.227.112.250
                                         190.171.60.6
10       Ethernet4     225.2.2.2         Exclude
10       Ethernet4     225.3.3.3         Exclude
                                         150.227.112.250
  • This command displays groups in the overlay with remote receivers, which are learned via SMET and Join-Synch routes.
    switch> show ip igmp snooping groups evpn 
IGMP Snooping Group Membership
EX : Filter mode Exclude
IN : Filter mode Include
IR : Ingress Replication
VLAN  Group            Members
----  ---------------  ----------------
4093  227.1.1.1        PIM-Tunnel
4094  228.1.1.1        PIM-Tunnel
    Note: Tthe port PIM-Tunnel indicates that packets destined to these groups is encapsulated in a multicast header and sent over the underlay network.

show ip igmp snooping groups count

The show ip igmp snooping groups count command displays the number of multicast groups on the switch. Command provides options to only include specific VLANs and ports.

Command Mode

EXEC

Command Syntax

show ip igmp snooping groups [VLAN_ID][PORT_INT] count [DATA]

Parameters
  • VLAN_ID specifies VLAN for which command displays information. Options include:
    • no parameter all VLANs.
    • vlan v_num specified VLAN.
  • PORT_INT specifies physical ports for which command displays information. Options include:
    • no parameter all physical ports.
    • interface ethernet e_range specified Ethernet ports.
    • interface port-channel p_range specified port channels.

      Valid e_range and p_range formats include number, number range, or comma-delimited list of numbers and ranges.

  • DATA specifies the type of information displayed. Options include:
    • no parameter number of multicast group on specified VLAN and ports.
    • detail number of multicast group on specified VLAN and ports.

Example

This command displays the number of multicast groups on the switch.
switch> show ip igmp snooping groups count
Total number of multicast groups: 2
switch>

show ip igmp snooping mrouter

The show ip igmp snooping mrouter command displays the status of dynamic and static multicast router ports. Command provides options to include only specific VLANs.

Command Mode

EXEC

Command Syntax

show ip igmp snooping mrouter [VLAN_ID][DATA]

Parameters
  • VLAN_ID specifies VLAN for which command displays information. Options include:
    • no parameter all VLANs.
    • vlan v_num specified VLAN.
  • DATA specifies the type of information displayed. Options include:
    • no parameter displays VLAN number and port-list for each group.
    • detail displays port-specific data for each group; includes transmission times and expiration.
Examples
  • This command displays port information of each multicast router on all VLANs.
    switch> show ip igmp snooping mrouter
Vlan    Interface-ports
----------------------------------------
1       Po1(dynamic)
20      Po1(dynamic)
26      Cpu(dynamic)
2028    Cpu(dynamic), Po1(dynamic)
switch>
  • This command displays multicast router information for each port.
    switch> show ip igmp snooping mrouter detail
Vlan   Intf      Address           FirstHeard LastHeard  Expires    Type
---------------------------------------------------------------------------
1      Po1       172.17.0.37       31549:12   0:12       1:33       pim
20     Po1       172.17.20.1       7066:51    0:19       1:26       pim
26     Cpu       172.17.26.1       31549:16   0:28       1:17       pim
2028   Po1       172.17.255.29     31549:10   0:18       1:27       pim
2028   Cpu       172.17.255.30     31549:14   0:28       1:17       pim
switch>

show ip igmp snooping report-flooding

The show ip igmp snooping report-flooding command displays IGMP snooping L2 report flooding configuration and status information. Command provides options to only include specific VLANs.

Command Mode

EXEC

Command Syntax

show ip igmp snooping report-flooding [VLAN_ID][DATA]

Parameters
  • VLAN_ID specifies VLANs for which command displays information. Options include:
    • no parameter all VLANs.
    • vlan v_num specified VLAN.
  • DATA specifies the type of information displayed. Options include:
    • no parameter displays VLAN number and port-list for each group.
    • detail displays port-specific data for each group; includes transmission times and expiration.

show ip igmp static-groups

The show ip igmp static-groups command displays information about all configured IGMP multicast static groups. IGMP multicast static groups are assigned with the ip igmp static-group command.

Command Mode

EXEC

Command Syntax

show ip igmp static-groups [INFO_LEVEL][interface INT_NAME]

Parameters
  • INFO_LEVEL specifies the type of information displayed. Options include:
    • no parameter VLAN number and port-list for each group.
    • detail port-specific information for each group, including transmission times and expiration.
  • INT_NAME Interface type and number. Values include:
    • no parameter static groups on all interfaces.
    • ethernet e_num Ethernet interface specified by e_num.
    • loopback l_num Loopback interface specified by l_num.
    • management m_num Management interface specified by m_num.
    • port-channel p_num Port-Channel Interface specified by p_num.
    • vlan v_num VLAN interface specified by v_num.
    • VXLAN vx_num VXLAN interface specified by vx_num.
Related Commands
Examples
  • This command displays information about all multicast static groups.
    switch> show ip igmp static-groups
Interface Vlan281:
        Manually configured groups:
Interface Port-Channel999:
        Manually configured groups:
switch>
  • This command displays information about the multicast static groups on interface vlan 21.
    switch> show ip igmp static-groups interface vlan 21
Interface Vlan281:
        Manually configured groups:
switch>

show ip igmp static-groups acl

The show ip igmp static-groups acl command displays information about the IGMP multicast static groups that are configured by the specified access Control List (ACL). The command also displays problems with an ACL that prevent its assignment to an interface.

Command Mode

EXEC

Command Syntax

show ip igmp static-groups acl

Examples
  • The following show ip igmp static-group acl command example references these ACLs:
    ip access-list 1
   10 permit igmp host 10.1.1.1 10.1.1.0/29
   20 permit igmp host 10.1.1.2 10.1.1.0/29
!
ip access-list 2
   10 permit igmp 10.1.1.0/29 host 10.1.1.1
!
ip access-list 3
   10 deny igmp host 10.1.1.1 255.1.1.0/29
!
ip access-list 4
   10 permit igmp host 10.1.1.1 10.1.1.0/29
   20 permit igmp 10.1.1.0/29 host 10.1.1.1
  • This command displays static group configuration data about the various ACLs.
    switch> show ip igmp static-group acl 1
acl 1
        ( 10.1.1.1, 10.1.1.0/29 )
        ( 10.1.1.2, 10.1.1.0/29 )
Interfaces using this ACL for static groups:
        Ethernet12
switch>show ip igmp static-group acl 2
acl 2
        Seq no 30: source address must be a single host or *, not a range
Interfaces using this ACL for static groups:
        Ethernet8
switch>show ip igmp static-group acl 3
acl 4
        Seq no 10: action must be 'permit'
Interfaces using this ACL for static groups:
         none
switch>show ip igmp static-group acl 4
acl 5
        ( 10.1.1.1, 10.1.1.0/29 )
       Seq no 20: source address must be a single host or *, not a range
Interfaces using this ACL for static groups:
         none
switch>

show ip igmp static-groups group

The show ip igmp static-groups group command displays information about all specified IGMP multicast static groups. IGMP multicast static groups are assigned with the ip igmp static-group command.

Command Mode

EXEC

Command Syntax

show ip igmp static-groups group [GROUP_LIST]

Parameters

GROUP LIST Groups for which command displays information:
  • no parameter all multicast groups.
  • group_address single multicast group address (dotted decimal notation).

Related Commands

show ip igmp static-groups

show ip igmp statistics

The show ip igmp statistics command displays IGMP transmission statistics for the specified interface.

Command Mode

EXEC

Command Syntax

show ip igmp statistics [INTERFACE_ID]

Parameters

INTERFACE_ID Specifies tnterface for which command returns data. Options include:
  • no parameter all interfaces.
  • interface ethernet e_num Ethernet interface specified by e_num.
  • interface loopback l_num Loopback interface specified byl_num.
  • interface management m_num Management interface specified by m_num.
  • interface port-channel p_num Port-Channel Interface specified by p_num.
  • interface vlan v_num VLAN interface specified by v_num.
  • interface VXLAN vx_num VXLAN interface specified byvx_num.

Example

This command displays IGMP transmission statistics for interface ethernet 1.
switch> show ip igmp statistics interface ethernet 1
IGMP counters for Ethernet1:
  V1 queries sent: 0
  V2 queries sent: 0
  V3 queries sent: 3
  Total general queries sent: 3
  V3 group specific queries sent: 0
  V3 group-source specific queries sent: 0
  V1 queries received: 0
  V2 queries received: 0
  V3 queries received: 0
  V1 reports received: 0
  V2 reports received: 0
  V3 reports received: 14
  V2 leaves received: 0
  Error Packets received: 0
  Other Packets received: 0
switch>