Maintenance and Field Replacement

This section discusses the process for replacing switch components.

You must ensure that at least one of the secondary grounding pads on the chassis's front panel 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 to ground yourself and prevent ESD damage to the switch.

Note: Illustrations in this section are examples of a representative switch and component(s). Apply procedures to component(s) supported by the specific switch. You must use component(s) and the appropriate slots for those component(s) when replacing or adding them.

Inspect the connectors for damage before installing components into the chassis.

Linecard and Supervisor Extraction Tools

Assemble and tether the extraction tools to remove and insert linecards and supervisor modules into the chassis.

Note: The 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 - Linecard and Supervisor Module Extraction Tool and Tether Assembly.
Figure 1. Linecard and Supervisor Module Extraction Tool and Tether Assembly

Diagram showing the linecard/supervisor extraction tool. Numbered steps show how to thread the security lanyard through the plastic tether plug and attach it to the tool's metal ring.

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.
  4. Repeat for the other tools as appropriate.

Power Supplies

The switches support AC or DC Power supplies. Depending on the switch model, they ship with a number of populated slots. Empty slots are covered with a blank. To add a new power supply in one of the available slots, remove the blank covering the slot before inserting a new power supply. When adding or replacing power supplies, perform the following steps for ESD protection.
Note: The front panel shows the power supply locations 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. To add the new power supply, 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).
     

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 13 - AC Power Supply Status LED States.

Removing DC Power Supply

  • Remove power 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 14 - DC Power Supply Status LED States.
     

Removing Power Supply Blank

Friction holds The power supply blank in place.
  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 can save the blank for future use as needed. A blank is needed for the switch to operate normally in an unpopulated power supply slot.

Fabric and Fan Module (Fabric Module)

The fabric and fan modules are hot-swappable and accessible from the switch's rear panel (Rear Panel). You must consider that the module you are inserting is compatible with the switch and the module 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 half-height.

Removing Fabric Module

  1. Put on a grounded, anti-static ESD strap.
  2. Loosen the two Phillips screws on the 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.
    Series of technical diagrams showing hand operations. Highlights include pulling ejector levers to 90 degrees to disengage the module and closing them in unison to lock the module seating claws into the chassis.
     
    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 touches the chassis's rear face.
    A technical instructional diagram detailing the proper alignment and insertion of a Fabric Module (FM) into an Arista modular chassis, using numbered callouts 1 through 8 and detailed inset views.

     

     
    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.
    A technical instructional diagram detailing the second step of installing a Fabric Module (FM) into an Arista modular chassis, specifically focusing on engaging the mechanical ejector handles.
     
    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.
    A technical instructional diagram detailing the final stages (Step III and Step IV) of securing a Fabric Module (FM) into an Arista modular chassis, using numbered callouts 1 through 8.
     
    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    
    CAUTION: Ensure that the claws engage correctly on the 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 operates normally (Table 7 - Fan Status and Fabric Status LEDs on the Rear Panel).
  8. Use the show environment cooling command to verify normal operation further.

Fan Module (within Fabric Module)

The fabric and fan modules are hot-swappable and accessible from the switch's rear panel (Rear Panel). You must ensure that the module you insert is compatible with the switch and the module you are replacing. Perform the following steps to remove and replace a fan module that 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.
    A technical instructional diagram detailing the two-step process for Fan Removal from an Arista modular chassis, featuring numbered callouts 1 and 2 and directional arrows.
     
    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 half-height, and currently does not have a label depicting fan removal.

Supervisor Module

The supervisor modules are hot-swappable and accessible from the front of the switch. You must consider that the module you are inserting is compatible with the switch and the module you are replacing. Use the following procedure to remove and replace a supervisor module. For the supervisor module locations for your device, refer to the 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 the 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 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 the supervisor module into the slot.
  4. Lock the supervisor module using the tool supplied (Front Panel).
  5. Verify that the module is operating normally (Table 1 - Supervisor Status LED States).

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 can save the blank for future use as needed. A blank is needed for the switch to operate normally in an unpopulated supervisor module slot.

Linecards

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

Removing Linecard

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

Installing Linecard

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

Removing Linecard Blank

Perform the following steps to remove linecard 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 linecard slot you will populate.

    The linecard blank has plastic latches. You can save the blank for future use as needed. The blank is needed for the switch to operate normally for an unpopulated linecard slot.