Regulatory Model Numbers

This appendix lists the Regulatory Model Numbers (RMNs), where applicable, for the product models for the switches described in this document.

Table 1. Regulatory Model Numbers and Product Numbers
Regulatory Model Number (RMN) Product Number(s)
7804 7804
7808 7808
7812 7812
7816 7816

Maintenance and Field Replacement

This appendix describes the process for replacing switch components.

The following topics are covered in this section:

You must ensure that at least one of the secondary grounding pads located on the front panel of the chassis is connected to the data center ground. While working on the switches, use grounded, anti-static wrist straps connected to one of the attach points on the switch for grounding yourself and preventing ESD damage to the switch.

Note: Illustrations in this appendix are examples for a representative switch and component(s). Procedures must be applied to component(s) supported by the specific device. You must use component(s) and the appropriate slots for those component(s) when replacing or adding them.

 

Inspect the connectors for damage prior to installing components into the chassis.

Line Card and Supervisor Extraction Tools

Extraction tools are provided for removing and inserting line cards and supervisor modules into the chassis. Assemble and tether these to the chassis.

Note: Front Panel shows the locations for tethering and storing the extraction tools.

 

Assembling and Storing the Extraction Tools

The extraction tools come with a lanyard and tethering plug as shown in Figure 1.
Figure 1. Linecard and Supervisor Module Extraction Tool and Tether Assembly

Use the following steps to attach the tethering mechanism to the extraction tool.

  1. Extend and slip the lanyard thread through the slot in the plastic tether.
  2. Attach the ring to the extraction tool.
  3. Plug the plastic tether into one of the slots (Figure 1).
  4. Repeat for the other tools as appropriate.

Power Supplies

The switches support AC or DC Power supplies. The switches ship with a number of populated slots depending on the switch model. Empty slots are covered with a blank. For adding a new power supply in one of the available slots, remove the blank covering the slot before inserting a new power supply.The following steps are required for ESD protection when adding or replacing power supplies.
Note: Front Panel shows the locations of power supplies for your device.

 

  1. Connect at least one of the chassis grounding pads located on the front and rear panels of the chassis to the data center ground as needed to ensure that the switch is grounded.
  2. Put on an anti-static ESD wrist strap and connect it to one of the attach points on the switch.
  3. Remove the power supply to be replaced (Removing AC Power Supply, Removing DC Power Supply) or the blank for the slot (Removing Power Supply Blank) in which the new power supply is to be added.

Removing AC Power Supply

Perform the following steps to remove an AC power supply.
  1. Put on a grounded, anti-static ESD strap.
  2. Unplug the cable(s) by squeezing the cable release. Up to two cables could be powering each PSU.
  3. Squeeze the latch release.
  4. Remove the power supply from the switch using the power supply latch release and handle.

Installing AC Power Supply

You must make space for installing the power supply by removing an existing one (Removing AC Power Supply, Removing DC Power Supply) or removing a blank (Removing Power Supply Blank) from a power supply slot available on the switch.

Perform the following steps to install an AC power supply:

  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the new power supply.
  3. Insert the new power supply into the empty power supply slot.
  4. After you insert the power supply, push gently on the power supply until the power supply is fully seated.
  5. Connect the power cord(s) to the power supply. Up to two cables can power each PSU.
  6. Connect to the power source.
  7. Verify normal operation using the LED indicators for your switch Table 5.

Removing DC Power Supply

  • Ensure power is removed from DC circuits by turning off the power line servicing the circuits.
  • Make sure to remove the ground connection last when removing power.
  1. Put on a grounded, anti-static ESD strap.
  2. Disconnect the power cable from the DC power source.
  3. Squeeze the latch release.
  4. Remove the power supply from the switch using the power supply latch release and handle.
  5. Remove each power cable lug to the terminal studs with the flange locking nuts.
  6. Remove the flange locking nuts to each of the terminal studs.
  7. Disconnect the power cable lug from the terminal studs.

Installing DC Power Supply

You must make space for installing the power supply by removing an existing one (Removing AC Power Supply, Removing DC Power Supply) or removing a blank (Removing Power Supply Blank) from a power supply slot available on the switch.
Perform the following steps to install a DC power supply.
  1. Put on a grounded ESD strap.
  2. Unpack the new power supply.
  3. Connect the cables for your power supply as explained in the guide (Cabling the Modular Switch).
  4. Insert the new power supply into the empty power supply slot.
  5. After you insert the power supply, push gently on the power supply until the power supply is fully seated.
  6. Connect to the power source.
  7. Verify normal operation using the LED indicators for your switch Table 6.

Removing Power Supply Blank

The power supply blank is held in place by friction.
  1. Put on a grounded, anti-static ESD strap.
  2. Remove the blank from the power supply slot you are going to populate.
    Note: You may want to save the blank for future use as needed. The blank is needed for the switch to operate normally if a power supply slot is not populated.

     

Fabric and Fan Module (Fabric Module)

The fabric and fan modules are hot-swappable. They are accessible from the rear of the switch (Rear Panel). You must take into account that the module you are inserting is compatible with the switch and the module that you are replacing. Perform the following steps to remove and replace a fabric and fan module, or a fan-only module, if your switch supports one.

Note: The DCS-7816 switch has twelve fabric modules, each of half height.

Removing Fabric Module

  1. Put on a grounded, anti-static ESD strap.
  2. Loosen the two Phillips screws on fabric module.
    Note: The DCS-7812R3-FM fabric module has green latch release buttons. Use these instead.
  3. Pull out the ejector levers on the fabric module.
    1 Fabric module ejector levers 3 Fabric module ejector claws 5 Fabric module ejector claw
    2 Claw position on chassis 4 Claw position on chassis 6 Claw position on chassis

     

  4. Pull the ejector handles outwards by 90 degrees to disengage the fabric module.
  5. Pull on the ejector handles to remove the fabric module from the slot.
    Note: Fabric modules can be heavier than 25 lbs. Provide adequate support while handling them to prevent injury or damage.

     

Installing Fabric Module

You must make space for installing the module by removing an existing one (Removing Fabric Module) from a fabric module slot available on the switch.
Perform the following steps to install the module:
  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the module to be installed.
  3. Slide the module into the open slot until the injector claw is touching the rear face of the chassis.
    1 Fabric module top right injector claw 4 Claw position on chassis 7 Fabric module bottom left injector claw
    2 Fabric module top right ejector claw 5 Fabric module top injector claws 8 Claw position on chassis
    3 Fabric module ejector levers 6 Claw position on chassis    

     

  4. Fully open the ejector levers at 90 degrees and seat the module.
    Note: The ejector claws should be touching the rear face of the chassis.
    1 Fabric module ejector levers 3 Fabric module seating claws 5 Fabric module seating claw
    2 Claw position on chassis 4 Claw position on chassis 6 Claw position on chassis

     

  5. Close the ejector levers in unison.
    CAUTION: Ensure that the claws engage correctly on the chassis.
    1 Fabric module ejector levers 4 Claw position on chassis 7 Screw
    2 Claw position on chassis 5 Fabric module ejector claw 8 Screw
    3 Fabric module ejector claws 6 Claw position on chassis    

     

  6. Screw in the two Phillips screws using a PH3 driver on a battery operated screwdriver with torque set between 16 and 18 in-lbs.
    Note: The DCS-7812 does not require screws.The green latch release buttons will pop out when the fabric module is seated.

     

  7. Verify that the module is operating normally (Table 4).
  8. Use the show environment cooling command to further verify normal operation.

Fan Module (within Fabric Module)

The fabric and fan modules are hot-swappable. They are accessible from the rear of the switch (Rear Panel). You must take into account that the module you are inserting is compatible with the switch and the module that you are replacing. Perform the following steps to remove and replace a fan module which is part of the fabric module.

  1. Remove the fabric module with the fan to be replaced (Removing Fabric Module).
  2. Place the fabric module on a flat work surface. A cart or table designated for such tasks is typically appropriate.
  3. Locate the failed fan and
    1. Push the green latch then
    2. Rotate the fan lever to the open position.
      Note: See figure below.
    1 Release latch
    2 Fan lever
  4. Lift the fan straight up and out of the fabric module.
  5. Insert the replacement fan straight down and into the fabric module.
  6. Rotate the fan lever to the closed position.
  7. Ensure that the green latch has securely slid into the latched and locked position.
  8. Reinstall the fabric module into the chassis (Installing Fabric Module).
Note: The DCS-7816 switch has twelve fabric modules, each of half height, and currently does not have a label to depict fan removal.

Supervisor Module

The supervisor modules are hot-swappable. They are accessible from the front of the switch. You must take into account that the module you are inserting is compatible with the switch and the module that you are replacing. Use the following procedure to remove and replace a supervisor module. For the supervisor module locations for your device, refer to Front Panel.

Removing Supervisor Module

Perform the following steps to remove the module.
  1. Put on a grounded ESD strap.
  2. Use the extraction tool supplied (Front Panel) to unlock the supervisor card.
  3. Pull the supervisor module out.
  4. Slide supervisor module out of the slot.

Installing Supervisor Module

You must make space for installing the module by removing an existing one (Removing Supervisor Module) or removing a blank (Removing Supervisor Module Blank) from a supervisor module slot available on the switch.
Perform the following steps to install the module:
  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the supervisor module to be installed.
  3. Slide supervisor module into slot.
  4. Lock the supervisor module in place using the tool supplied (Front Panel).
  5. Verify that the module is operating normally (Table 1).

Removing Supervisor Module Blank

The supervisor module blank has plastic latches.
  1. Put on a grounded, anti-static ESD strap.
  2. Grip the plastic handles to release the latch and remove the blank from the supervisor module slot you are going to populate.

    You may want to save the blank for future use as needed. The blank is needed for the switch to operate normally if a supervisor module slot is not populated.

Line Cards

The line cards are hot-swappable. They are accessible from the front of the switch. You must take into account that the line card you are inserting is compatible with the switch and the line card that you are replacing. Use the following procedure to remove and replace a line card. If you are adding a new line card, remove the blank from the line card slot and install the new line card. For the line card locations on your switch, refer to Front Panel.

Removing Line Card

Perform the following steps to remove a line card:
  1. Put on a grounded, anti-static ESD strap.
  2. Use the tools supplied (Front Panel) simultaneously on each end of the line card.
  3. Pull the line card out gently once released.
  4. Slide line card out of the slot.

Installing Line Card

You must make space for installing the linecard by removing an existing one (Removing Line Card) or removing a blank (Removing Line Card Blank) from a linecard slot available on the switch.
  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the line card to be installed.
  3. Slide the line card into the slot.
  4. Use the tools supplied (Front Panel) simultaneously on each end of the line card to lock it in place.
  5. Verify that the line card is operating normally (Line Card Module Indicators).

Removing Line Card Blank

Perform the following steps to remove line card blank:
  1. Put on a grounded, anti-static ESD strap.
  2. Grip the plastic handles to release the latch and remove the blank from the line card slot you are going to populate.

    The line card blank has plastic latches. You may want to save the blank for future use as needed. The blank is needed for the switch to operate normally if a line card slot is not populated.

Line Cards

This appendix displays the line cards supported by modular switches covered by this guide.

Figure 1. DCS-7800R3-48CQ, DCS-7800R3K-48CQ, DCS-7800R3-48CQM, DCS-7800R3-48CQ2, DCS-7800R3-48CQMS, and DCS-7800R3-48CQM2

1 Line card status LED 3 Port status LEDs
2 Port numbers    

 

Figure 2. DCS-7800R3-36P

1 Line card status LED 3 Port status LEDs
2 Port numbers    

 

Figure 3. DCS-7800R3-36D and DCS-7800R3K-36DM

1 Line card status LED 3 Port status LEDs
2 Port numbers    

 

Rear Panel

This appendix displays the rear panel of all switches covered by this guide.

Note: Depending on the components used to populate the chassis, the appearance of a specific switch could be different.

 

Figure 1. DCS-7804 Rear Panel (Fully Populated)
1 ESD attachment point 3 Fabric modules 5 Fabric module ejector lever
2 Chassis ground 4 Fabric module screw    

 

Figure 2. DCS-7808 Rear Panel (Fully Populated)

1 Fabric module screw 3 Chassis ground
2 Fabric module ejector lever 4 ESD attachment point

 

Figure 3. DCS-7812 Rear Panel (Fully Populated)
1 ESD attachment point 4 Fabric module ejector lever
2 Fabric module release button 5 Fabric module release button
3 Fabric module ejector lever    

 

Figure 4. DCS-7816 Rear Panel (Fully Populated)

1 Fabric module screw 5 ESD attachment point 9 Fabric module
2 Fabric module ejector lever 6 Fabric module screw    
3 Fabric module screw 7 Fabric module ejector lever    
4 Fabric module 8 Fabric module screw    

 

Front Panel

This appendix displays the front panel of all switches covered by this guide.

Note: Depending on the components used to populate the chassis, the appearance of a specific switch could be different.

 

Note: All switches are designed to fit in 19-inch racks.
Figure 1. DCS-7804 Front Panel (Fully Populated)

1 Power supplies 4 Line cards 7 Supervisor lock
2 Line card and Supervisor extraction tool tether 5 Line card lock 8 Grounding locations
3 Extraction tool 6 Supervisor modules 9 ESD attach point

 

Figure 2. DCS-7808 Front Panel (Fully Populated)

1 Power supplies 4 Line cards 7 Supervisor lock
2 Line card and Supervisor extraction tool tether 5 Line card lock 8 Grounding locations
3 Extraction tool 6 Supervisor modules 9 ESD attach point

 

Figure 3. DCS-7812 Front Panel (Fully Populated)

1 Power supplies 4 Line cards 7 Supervisor lock
2 Line card and Supervisor extraction tool tether 5 Line card lock 8 Grounding locations
3 Extraction tool 6 Supervisor modules 9 ESD attach point

 

Figure 4. DCS-7816 Front Panel (Fully Populated)

1 Power supplies 6 Supervisor modules 11 Extraction tool
2 Line card and Supervisor extraction tool tether 7 Supervisor lock 12 Grounding locations
3 Extraction tool 8 Line cards 13 ESD attach point
4 Line cards 9 Line card lock    
5 Line card lock 10 Line card and Supervisor extraction tool tether    

 

Parts List

Each switch has an accessory kit that contains parts required to install the switch. The Table 1 provides further details on the accessory kit for each switch.

Table 1. Accessory Kits for the Modular Switches
  DCS-7804 DCS-7808 DCS-7812 DCS-7816
Common Cables and Accessories

(See Parts Used in All Rack Mount Configurations)

 Included Included Included Included
Four-post Rack Mount Kit

(See Four-Post Rack Mount Parts)

 Included Included Included Included
Number of Power Cords Included 12 16 20 24
Lifting Kit Not applicable Not applicable 4x brackets 8x bolts 4x brackets 16x bolts

 

Warning: All provided power cables are for use only with Arista products.

 

Câbles d’alimentation doivent être utilisés uniquement avec des produits de Arista

 

 

The following sections in the chapter list the installation parts provided by the accessory kit in more detail:

Parts Used in All Rack Mount Configurations

Cables

Table 2. Cables Provided in Accessory Kit
Quantity Description
2 RJ-45 Patch Panel Cables, 2 meters.
2 RJ-45 to DB9 Adapter Cable, 2 meters.

 

Getting-Started Booklet

One 2-page document.

Four-Post Rack Mount Parts

The following sections list the parts provided in the accessory kit for four-post rack mount installations.

Table 3. Four-Post Rack Mount Parts
Quantity Description
1 Cradle assembly.
12 Rack mounting screws.
1 Template for rack mounting (used only for racks requiring mounting nuts)

 

Figure 1. Four-Post Rack Mount Parts

Figure 2. Lifting Bracket and Bolts (DCS-7812 and DCS-7816 only)

1 Lifting bracket
2 Bolts

 

Status Indicators

The following topics are covered in this section:

Supervisor Module

While the front panel of each switch can house two supervisors, switch operations require only one. Supervisors display switch status and contain Ethernet management and console ports. The supervisor provides:

System Level Status Indicator LEDs: DCS-7800-SUP-D

The system status indicator LEDs are shown in Figure 1.

Figure 1. Supervisor DCS-7800-SUP-D

1 Locking mechanism 5 Line card status LED 9 RJ-45 Serial management port
2 Supervisor status LED 6 Fabric Module status LED 10 USB Ports
3 Supervisor active status LED 7 Fan status LED 11 RJ-45 Ethernet management port
4 PSU status LED 8 Clock In 12 SFP Ethernet management port

 

Supervisor Status LEDs

Supervisor Status LED States interprets the states of the supervisor status LEDs for both the active and the redundant supervisor module.

Table 1. Supervisor Status LED States
Supervisor and System Condition(1) LED Name and State
Status Active Power Supply (PSU) Line Card (LC) Fabric Module (FM) Fan Module Ethernet Port
Link (Left) Activity (Right)
No power, failed, or improperly inserted. Off Off Off Off Off Off Off Off
Booting Blinking Green Off Off Off Off Off Off Off
Beacon Request Locate Blue Off Off Off Off Off Off Off
Normal Active Operation (Master Supervisor) System Status: Good Green Green Green Green Green Green (2) (2)
Redundant Supervisor (Active Standby) Status: Good Green Off Off Off Off Off Off Off
Forced fail-over to redundant supervisor (Not active) Status: Bad Red Off Off Off Off Off Off Off
Supervisor active and operating normally; No PSUs, LCs, FMs or Fan Modules present or powered Green Green Off Off Off Off Off Off
Supervisor active, Status: PSU failure (one or more) - no AC input, DC output, Over current or not enough PSUs present Green Green Red (3) (3) (3) (2) (2)
Supervisor active, Status: LC failure (one or more) Green Green (3) Red (3) (3) (2) (2)
Supervisor active, Status: FM failure (one or more) Green Green (3) (3) Red (3) (2) (2)
Supervisor active, Status: Fan Module failure (one or more) or not present Green Green (3) (3) (3) Red (2) (2)
Supervisor active, Ethernet port linked with activity Green Green (3) (3) (3) (3) Green Green
Supervisor active, Ethernet port linked with no activity Green Green (3) (3) (3) (3) Green Off
Supervisor active, Ethernet port not linked Green Green (3) (3) (3) (3) Off Off

1 Assumes redundant supervisor is present.

2 Depends on port operation.

3 Green for normal operation, red if no corresponding component is powered or present.

 

Note: Arista modular switches take 15 to 30 minutes to boot completely.

 

Line Card Module Indicators

Each line card module provides one status LED plus LEDs for each port on the card. Line Card Status LED shows a representative line card. The figures in Line Cards indicate the location of the LEDs on each line card.

Figure 2. Line Card Status LED

1 Line card status LED
2 Port status LED

 

Line Card Status LED States interprets the states of the status LED.

Table 2. Line Card Status LED States
LED State Status
Off Line card not inserted.
Green Line card operating normally.
Yellow (amber/orange) Line card administratively shut down or booting up.
Red Linecard has failed.
Red (blinking) Locator function is enabled.

 

The line card provides LEDs for each port module socket:
  • Each LED corresponds to a module.
  • A set of four LEDs correspond to each module. When the module is programmed as a 40G port, the first LED in the set reports status. When the module is programmed as four 10G or 100G ports, each port is assigned to an LED within the set.
  • For line cards that support OSFP and QSFP-DD ports with one LED per port, Line Card Port LED States interprets the port LED states.
    Table 3. Line Card Port LED States
    LED State Status
    Off Port link is down for all enabled interfaces.
    Green Port link is up for any enabled interface.
    Yellow (amber/orange) Port is disabled in software.
    Flashing yellow (amber/orange) Locator function is enabled on an interface.

     

Fabric Module Status Indicators

Fabric Status LEDs are on fan-fabric modules. Rear Panel displays the position of these modules on the rear of each switch. The following figure displays fan status and fabric status LEDs on the DCS-7804 switch. Figure 5 displays fan status and fabric status LEDs on the DCS-7808 and DCS-7816 switches.
Note: The fabric modules are installed vertically in the chassis. They are shown horizontally in the following illustrations.
Figure 3. DCS-7804R3-FM Fabric Module and Fan Status LEDs
1 Fabric module top 3 Fan module 2 status LED 5 Fan module 4 status LED
2 Fan module 1 status LED 4 Fan module 3 status LED 6 Fan module 5 status LED

 

The following figure displays fan status and fabric status LEDs on the DCS-7812 switch.

Figure 4. DCS-7812R3-FM Fabric Module
1 Fabric module top 6 Fan module 4 status LED 11 Fan module 8 status LED
2 Fabric module status LED 7 Fan module 5 status LED 12 Fan module 9 status LED
3 Fan module 1 status LED 8 Fan module 6 status LED 13 Fan module 10 status LED
4 Fan module 2 status LED 9 Fabric module ejector lever 14 Fan module 11 status LED
5 Fan module 3 status LED 10 Fan module 7 status LED    

 

Figure 5. DCS-7808R3-FM and DCS-7816R3-FM Fabric Module and Fan Status LEDs
1 Fabric module top 5 Fan module 3 status LED 9 Fan module 7 status LED
2 Fabric module status LED 6 Fan module 4 status LED 10 Fan module 8 status LED
3 Fan module 1 status LED 7 Fan module 5 status LED    
4 Fan module 2 status LED 8 Fan module 6 status LED    

For the 7816 switch, the lower fabric module fan modules are numbered 9 through 16.

Note:
  • DCS-7816R3-FM and DCS-7808R3-FM look similar. Check the label before populating the chassis
  • For the DCS-7816 switch, the top and bottom fabric modules form one logical fabric module. Both physical modules in a logical pair power down if either loses power.
  • The show module command lists the serial number (SN) of only the bottom-slot Fabric Module.

Fan Status and Fabric Status LEDs on Rear Panel interprets the states of the fan and fabric status LED.

Table 4. Fan Status and Fabric Status LEDs on Rear Panel
LED State Status
Off Module inserted, but status is unknown.
Green Module operating normally.
Red Module failed.

 

Power Supply Status Indicators

PWR-D1-3041-AC-BLUE

The power supply status LEDs are on the power supply modules. Figure 6 displays all the LEDs on the PWR-D1-3041-AC-BLUE AC power supply.

Figure 6. PWR-D1-3041-AC-BLUE Power Supplies

1 Handle 4 AC_A LED
2 Output 5 Release
3 AC_B LED    

 

Note: Handle color indicates airflow direction.

AC Power Supply Status LED States interprets the AC power supply setup for LED status indicators.

 

Table 5. AC Power Supply Status LED States
Power Supply Status LED Name
AC_A AC_B Output
Normal Operation(1) Green Off Green
No AC Input - Single PSU Off Off Off
No AC Input - Parallel PSUs Yellow Yellow Off
Standby Mode Green Off Blinking Green(2)
AC_A Fail Yellow Green Green
AC_B Fail Green Yellow Green
Power Supply Fault Green Off Yellow
Boot Loader Off Off Blinking(3)

1 AC_A is the primary input.

2 1 Hz, 50% Duty Cycle.

3 1 Hz, 50% Green, 50% Yellow.

PWR-D2-3041-DC-BLUE

The power supply status LEDs are on the power supply modules. Figure 7 displays all the LEDs on the PWR-D2-3041-DC-BLUE DC power supply.

Figure 7. PWR-D2-3041-DC-BLUE Power Supplies

1 Status LED (Output) 4 Input_A LED 7 Battery return terminal
2 Release 5 Protective earth terminal 8 -48V terminal
3 GND terminal 6 Input_B LED    

 

Note: Release lever color indicates airflow direction.

 

DC Power Supply Status LED States interprets the DC power supply setup for LED status indicators.

Table 6. DC Power Supply Status LED States
Power Supply Status LED Name
Input_A Input_B Output
Normal Operation Green Green Green
No DC Input - Single PSU Off Off Off
No DC Input - Parallel PSUs

(Standby Mode 2)

 Yellow Yellow Off
Standby Mode 1 Green Green Blinking Green(1)
Input_A Fail Yellow Green Green
Input_B Fail Green Yellow Green
Power Supply Fault Green Green Yellow
Boot Loader Off Off Blinking(2)

1 1 Hz, 50% Duty Cycle.

2 1 Hz, 50% Green, 50% Yellow.

3 States can be combined.

 

Configuring the Modular Switch

Arista switches ship from the factory in Zero Touch Provisioning (ZTP) mode. ZTP configures the switch without user intervention by downloading a startup configuration file or a boot script from a location specified by a DHCP server. To manually configure a switch, ZTP is bypassed. The initial configuration provides one username (admin) accessible only through the console port because it has no password.

When bypassing ZTP, initial switch access requires logging in as admin, with no password, through the console port. Then you can configure an admin password and other password protected usernames.

This manual configuration procedure cancels ZTP mode, logs into the switch, assigns a password to admin, assigns an IP address to the management port, and defines a default route to a network gateway.

  1. Provide power to the switch (Cabling the Supplies).
  2. Connect the console port to a PC.

    As the switch boots without a startup-config file, it displays this message through the console:

    The device is in Zero Touch Provisioning mode and is attempting to
download the startup-config from a remote system. The device will not
be fully functional until either a valid startup-config is downloaded
from a remote system or Zero Touch Provisioning is cancelled. To cancel
Zero Touch Provisioning, login as admin and type 'zerotouch cancel'
at the CLI.
localhost login:
  3. Log into the switch by typing admin at the login prompt. 
    localhost login:admin
  4. Cancel ZTP mode by typing zerotouch cancel. IMPORTANT: This step initiates a switch reboot. 
    localhost>zerotouch cancel
  5. After the switch boots, log into the switch again by typing admin at the login prompt. 
    Arista EOS
localhost login:admin
Last login: Fri Mar 15 13:17:13 on console
  6. Enter global configuration mode. 
    localhost>enable
localhost#config
  7. Assign a password to the admin username with the username secret command. 
    localhost(config)#username admin secret pxq123
  8. Configure a default route to the network gateway. 
    localhost(config)#ip route 0.0.0.0/0 192.0.2.1
  9. Assign an IP address (192.0.2.8/24 in this example) to an Ethernet management port. 
    localhost(config)#interface management 1/1
localhost(config-if-Ma1/1)#ip address 192.0.2.8/24
  10. Save the configuration by typing write memory or copy running-config startup-config. 
    localhost#copy running-config startup-config
  11. When the management port IP address is configured, use this command to access the switch from a host, using the address configured inStep 9: 
    ssh admin@192.0.2.8
    Refer to the Arista Networks User Manual for the complete switch configuration information.

Cabling the Modular Switch

The following topics are covered in this section:

Cabling the Power Supplies

Before you begin, refer to the Arista Networks document Compliance and Safety Guide available at: https://www.arista.com/en/support/product-documentation.

Note: Power supplies may be loaded in the PSU bays in any order. The following order is recommended for each of the switches covered by this guide.

 

Table 1. Recommended PSU Bay Population Order
Switch Order
DCS-7804 8, 7, 6, 5, 4, 3, 2, 1
DCS-7808 6, 12, 5, 11, 4, 10, 3, 9, 2, 8, 1, 7
DCS-7812 9, 18, 8, 17, 7, 16, 6, 15, 5, 14, 4, 13, 3, 12, 2, 11, 1, 10
DCS-7816 8, 16, 24, 7, 15, 23, 6, 14, 22, 5, 13, 21, 4, 12, 20, 3, 11, 19, 2, 10, 18, 1, 9, 17

 

The following figure shows the recommended order. All unpopulated bays should be covered with a blank (X).

Note: '*' designates the recommended starting bay.
Important: Power down the switch: Remove all power cords from the power inlets.

 

Mettez le commutateur: Retirez tous les cordons d'alimentation des prises d'alimentation.

 

Important: Installation of this equipment must comply with local and national electrical codes. If necessary, consult with the appropriate regulatory agencies and inspection authorities to ensure compliance.

 

Installation de cet équipement doit être conformes aux codes électriques locaux et nationaux. Si nécessaire, consulter les organismes de réglementation appropriés et des autorités de contrôle pour assurer la conformité.

 

Note: Many configurations will require additional power supplies.

 

Nombreuses configurations exigera des alimentations supplémentaires.

 

Important: All power supply slots must be filled with either a power supply or blank to ensure proper air flow.

 

Tous les emplacements d'approvisionnement de puissance doivent être remplis avec une alimentation ou vide pour assurer un débit d'air appropriée.

 

Important: Read all installation instructions before connecting the system to the power source.

 

Lire toutes les instructions d'installation avant de brancher le système à la source d'alimentation.

 

The Table 3 shows the minimum number of operating power supplies that must be connected to active circuits for each switch to operate.

Each power supply includes a fan that maintains proper power supply temperature. The appendices display the location of components for all switches described in this guide.

Cabling Chassis Ground

The Figure 1, Figure 2, Figure 3, and Figure 4 display the location of the chassis grounding locations on the front panel of the switches. Chassis ground locations are also located on the rear panel of the switch chassis. After mounting the switch into the rack, connect at least one of the chassis grounds to the data center ground using two-hole ground lugs with 16 mm (5/8 in.) spacing, and two M4 x 0.7 screws. After the switch is grounded, ESD wrist straps can be grounded by connecting them to one of the attach points.

Important: Grounding wires and grounding lugs are not supplied. Wire size should meet local and national installation requirements. Commercially available 2 or 4 AWG wire is recommended for installations in the U.S.

 

À la terre et de mise à la terre fils cosses ne sont pas fournis. Calibre des fils doit satisfaire des exigences de l'installation locale et nationale. Disponible dans le commerce 2 ou 4 AWG fil est recommandé pour les installations aux États-Unis.

 

Important: This equipment must be grounded. Never defeat the ground conductor. This unit requires over-current protection.

 

Cet équipement doit être mis à la terre. Ne jamais modifier le conducteur de terre. Cet appareil nécessite de protection contre les surintensités.

 

Important: Secondary Grounding wires, lugs, and screws (M4 x 0.7) are not supplied.

 

Secondaire à la terre, câbles, cosses et vis (M4 x 0.7) ne sont pas fournis.

 

Figure 1. Front Panel (DCS-7804)

1 Power supplies 4 Linecards 7 Supervisor lock
2 Linecard and Supervisor extraction tool tether 5 Linecard lock 8 Grounding locations
3 Extraction tool 6 Supervisor modules 9 ESD attach point

 

Figure 2. Front Panel (DCS-7808)

1 Power supplies 4 Linecards 7 Supervisor lock
2 Linecard and Supervisor extraction tool tether 5 Linecard lock 8 Grounding locations
3 Extraction tool 6 Supervisor modules 9 ESD attach point

 

Figure 3. Front Panel (DCS-7812)

1 Power supplies 4 Linecards 7 Supervisor lock
2 Linecard and Supervisor extraction tool tether 5 Linecard lock 8 Grounding locations
3 Extraction tool 6 Supervisor modules 9 ESD attach point

 

Figure 4. Front Panel (DCS-7816)

1 Power supplies 6 Supervisor modules 11 Extraction tool
2 Linecard and Supervisor extraction tool tether 7 Supervisor lock 12 Grounding locations
3 Extraction tool 8 Linecards 13 ESD attach point
4 Linecards 9 Linecard lock    
5 Linecard lock 10 Linecard and Supervisor extraction tool tether    
Note: To power down the switch, remove all power cords from the power inlets.

Cabling the AC Power Supplies

The switches use PWR-D1-3041-AC-BLUE (Figure 5) power supplies with SAF-D-GRID connectors on the PSU inputs. Power cables are included with the accessory kit (Table 1). To power the switch, insert the other side of the cable into the main power providing circuit.

Note: The power supply, handle color, orientation, etc. may be different in your device from the one shown in Figure 5.

 

Figure 5. AC Power Supply

The Front Panel displays the front panel location of the power supplies.

Note:
  • The LEDs on a PSU remain lit for a period of time even after you disconnect the power and remove the PSU from the chassis. They will eventually turn off in a short while.
  • The PWR-D1-3041-AC-BLUE PSU uses 2x 220 V supply inputs and uses 2 APP SAF-D-GRID 400 connectors.

 

Cabling the DC Power Supply

Note: The -48V and Battery-Return leads are a pair and should run adjacent to each other and be approximately the same length.

 

Le - 48V et câbles de batterie-retour sont une paire courir à côté de l'autre et doivent être à peu près la même longueur.

 

DC Power Supplies

The switches support the PWR-D2-3041-DC-BLUE DC power supply displayed in Figure 6.

Figure 6. PWR-D2-3041-DC-BLUE Power Supplies

Note: Release lever color indicates airflow direction.

 

Wire and Lug Preparation

Before performing any installation actions, ensure power is removed from DC circuits by turning off the power line servicing the circuits. Prepare the stranded wiring before you begin a DC power installation.
  1. Stranded copper wiring is required.
    • Commercially available 1 to 2 AWG wire is recommended for installations in the U.S.
    • Wire size should meet local and national installation requirements.
    • Grounding wires and grounding lugs are not supplied.
    • Strip the wires to the appropriate length for the lugs.

    The wires connecting the DC power supply to the power source must meet the following requirements:

    • DC Input Wire Size: 1– 2 AWG
    • Primary Ground Wire Size: 1– 2 AWG per power supply.
    • The conductors are copper
  2. Use agency-approved compression (pressure) lugs for wiring terminations (2x - Two M6 studs with 5/8" spacing).
  3. Slip on heat-shrink tubing on the wire ends before assembling the lugs on to the wire.
    • The lugs must be crimped with the proper tool.
    • The tubing should extend over the lug’s barrel and the wire's insulator.
  4. Shrink the tubing with a heat gun.
    Figure 7. Lugs Wiring Terminations

    1 Insulated wire 3 Lug 5 Half-inch width
    2 Heat-shrink tubing 4 Quarter-inch diameter hole 6 Five-eighth-inch apart centers
     

Power Supply Specifications

The Table 2 shows the power supply specifications for each of the PSUs supported.

Table 2. Power Supply Specifications (each PSU)
Power Supply Maximum Output Power Rating (DC) Input Voltage and Frequency Maximum Input Current Input Branch Circuit Protection
PWR-D1-3041-AC-BLUE 3000 W 200 to 240 VAC(nominal) 50/60 Hz (nominal) 2x 16 A 2x 20 A
PWR-D2-3041-DC-BLUE 3000 W -48 V to -60 VDC, 70 A to 55A 2x 70 A 2x 90 A
Important: Each power supply requires input branch circuit protection in compliance with AHJ requirements.

 

Chaque alimentation nécessite une protection du circuit de la branche d’entrée conformément aux exigences de l’AHJ.

 

Power Supply Configurations

The Table 3 shows the power supply configurations for the modular switches.

Table 3. Power Supply Configurations
Modular Switch Recommended Number of PSUs (for redundancy) Number of PSUs Shipped in Bundle Minimum Number of PSUs Required Maximum Number of PSUs Supported
DCS-7804 6 6 6 8
DCS-7808 8 8 8 12
DCS-7812 10 10 10 18
DCS-7816 12 12 12 24

Recommendations for Power Supply Usage

  • Use separate circuits (A & B) with required protection for each power supply.
  • Use the same PSU model when replacing a failed PSU. Any suitable alternative must be approved before using if the original model is no longer supported or available.
  • Unless your switch allows for mixing power supplies, do not mix power supply types.
  • To minimize distribution power loss, use an equal number of supplies in each row: (e.g 4 PSUs in slots 1-4 and 4 PSUs in slots 7-10 for a configuration with 8 PSUs for the DCS-7808 switch). Table 1 provides more details.

     

    Note: PSUs can be housed in either of two rows for the DCS-7808 switch. The LEDs for PSUs in each row indicate correct status only after at least one of the PSUs in that row (PSU1 to PSU6 or PSU7 to PSU12) is energized from a power source. For the DCS-7812 and DCS-7816 switches, as long as one PSU is powered, all PSU LEDs will report status correctly.

     

  • All power supply slots must be filled with a powered supply, or a blank (X), or a non-powered power supply.
  • Valid redundancy configurations for each domain are described in Power Supply Redundancy section.

Power Supply Redundancy

Important: Installation of this equipment must comply with local and national electrical codes. If necessary, consult with the appropriate regulatory agencies and inspection authorities to ensure compliance.

 

Installation de cet équipement doit être conformes aux codes électriques locaux et nationaux. Si nécessaire, consulter les organismes de réglementation appropriés et des autorités de contrôle pour assurer la conformité.

 

Important: Read all installation instructions before connecting the system to the power source.

 

Lire toutes les instructions d'installation avant de brancher le système à la source d'alimentation.

 

Most installations will have redundant, dual, independent power feeds. Each independent power feed will be referenced as A and B.

 

The recommended installation is to wire input_A and input_B of each supply to independent power feed (A or B).
Note: When powered cables are connected to both A and B inputs of the PSU, the AC PSU will draw current from the A input. The B input is held in standby. The DC PSU will share power based on the input voltage.

 

Each power supply includes a fan that maintains proper power supply temperature. The following appendices display the location of the following component on all switches described in this guide.

The Front Panel displays the front panel location of the supervisor modules, line cards and PSUs.

The Rear Panel displays the rear panel location of fabric modules.

Important: This unit requires over-current protection.

 

Cet appareil nécessite de protection contre les surintensités.

 

 

Important: Unused slots must be occupied or covered with a blank to ensure proper airflow through the chassis.

 

Les emplacements inutilisés doivent être occupés ou recouvert d'un blanc pour assurer la bonne circulation d'air dans le châssis.

 

Connecting Supervisor Cables

Supervisor modules contain console, management, and USB ports. Figure 8 displays port and status LED locations on the supervisors. Refer to the chassis specification in Figure 9 for additional information about the serial port.

Figure 8. Supervisor DCS-7800-SUP, DCS-7800-SUP1A, and DCS-7816-SUP

1 Locking mechanism 5 Line card status LED 9 RJ-45 Serial management port
2 Supervisor status LED 6 Fabric Module status LED 10 USB Ports
3 Supervisor active status LED 7 Fan status LED 11 RJ-45 Ethernet management port
4 PSU status LED 8 Clock In 12 SFP Ethernet management port

 

  • Console (Serial) Port:Connect to a PC with RJ-45 to DB-9 serial adapter cable. Default switch settings include:
    • 9600 baud
    • No flow control
    • 1 stop bit
    • No parity bits
    • 8 data bits

The appropriate supervisor cards must be installed in one of the two slots designated for them. They are shown in Figure 9 for the DCS-7808 switch. For the DCS-7816 switch, the supervisor slots are in the middle of the chassis.

Figure 9. DCS 7808 Supervisor Slots

1 Power supplies 4 Linecards 7 Supervisor lock
2 Linecard and Supervisor extraction tool tether 5 Linecard lock 8 Grounding locations
3 Extraction tool 6 Supervisor modules 9 ESD attach point

 

RJ-45 to DB-9 Connections

RJ-45 DB-9 RJ-45 DB-9
RTS 1 8 CTS GND 5 5 GND
DTR 2 6 DSR RXD 6 3 TXD
TXD 3 2 RXD DSR 7 4 DTR
GND 4 5 GND CTS 8 7 RTS

 

  • Ethernet management port: Connect to 10/100/1000 management network with RJ-45 cable.
  • USB Port: May be used for software or configuration updates.
  • Clock Input Port: Port type is MCX connector, 2-5.5V, 50 ohm termination.

Connecting Line Card Modules and Cables

Install required SFP, SFP+, QSFP+, QSFP100, OSFP, and QSFP-DD optic modules in line card module ports (Figure 10).

Figure 10. SFP or SFP+ Ports

Connect cables as required to line card module ports. Supervisor and line card module ejectors on the front of the chassis assist with cable management.

CAUTION: Excessive bending can damage interface cables, especially optical cables.

 

Flexion excessive peut endommager les câbles d'interface, en particulier les câbles optiques.

 

Note: You must ensure that any open slots for modules, power supplies, etc. are covered by the appropriate “blank” plates. Check with your local Arista Networks representative if you have questions.