Managing the Switch Name

These sections describe how to configure the switch's domain and host name.

Assigning a Name to the Switch

A Fully Qualified Domain Name (FQDN) labels the switch and defines its organization ID in the Domain Name System hierarchy. The switch's FQDN consists of a host name and domain name.

The host name is uniquely associated with one device within an IP-domain. The default host name is localhost. You can configure the prompt to display the host name as described in prompt.
  • To assign a host name to the switch, use the hostname command. To return the switch’s host name to the default value of localhost, use the no hostname command.
  • To specify the domain location of the switch, use the dns domain command.

Examples

  • This command assigns the string main-host as the switch's host name.
    switch(config)# hostname main-host
main-host(config)#

  • This command configures aristanetworks.com as the switch's domain name.
    switch(config)# dns domain aristanetworks.com
switch(config)#

  • This procedure configures sales1.samplecorp.org as the switch's FQDN.
    switch(config)# dns domain samplecorp.org
switch(config)#

  • This running-config extract contains the switch's host name and IP-domain name.
    switch# show running-config
! Command: show running-config
! device: switch (DCS-7150S-64-CL, EOS-4.13.2F)
!

vlan 3-4
!
username john secret 5 $1$a7Hjept9$TIKRX6ytkg8o.ENja.na50
!
hostname sales1
ip name-server vrf default 172.17.0.22
dns domain samplecorp.org
!

end
switch#

Specifying DNS Addresses

The Domain Name Server (DNS) maps FQDN labels to IP addresses and provides addresses for network devices. Each network requires at least one server to resolve addresses. The configuration file can list a maximum of three server addresses.

To add name servers to the configuration, use the ip name-server command. Each command can add multiple servers. All server addresses support multiple VRFs, and a priority may be specified for each server named. If all name servers have the default priority (0), the default DNSmasq behavior is followed for the configuration. It queries all name servers simultaneously and forwards the requests to the first name server for 50 queries or 20 seconds, whichever expires sooner for answering. If any priorities are non-zero, queries are issued in order with a five second timeout between unresponsive name servers.

Note: DNSmasq does not fulfill in-flight requests to unresponsive name servers.

Example

This code displays the configuration file.
switch(config)# show ip name-server 
IP Address VRF     Priority
---------- ------- --------
10.0.0.1   default        0
10.0.0.2   default        1
10.0.0.1   vrf1           2
10.0.0.2   vrf1           3
fc00::1    default        4

The switch assigns source IP addresses to outgoing DNS requests. To force the switch to use a single, user-defined source interface for all requests, use the ip domain lookup command.

Examples

  • This command forces the switch to use VLAN 5 as the source interface for DNS requests originating from the default VRF.
    switch(config)# ip domain lookup source-interface Vlan5
switch(config)#

  • This command forces the switch to use VLAN 10 as the source interface for DNS requests originating from VRF purple.
    switch(config)# ip domain lookup vrf purple source-interface Vlan10
switch(config)#

  • This command configures up to four name servers on VRF purple.
    switch(config)# ip name-server vrf purple 10.1.1.24 priority 4
switch(config)#

  • This command removes the name servers.
    switch(config)# no ip name-server vrf purple 10.1.1.24
switch(config)#

  • This command removes all configured name in all VRFs.
    switch(config)# no ip name-server 
switch(config)#

Note:

NXDOMAIN is considered a valid reply for the query.