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Adding a New Switch to an Existing QFX Series Virtual Chassis (CLI Procedure)

This procedure applies to QFX Series Virtual Chassis only. For the procedure on adding a switch to a Virtual Chassis Fabric (VCF), see Adding a Device to a Virtual Chassis Fabric.

You can use this procedure to add an EX4300, QFX3500, QFX3600, or QFX5100 device to an existing QFX Series Virtual Chassis. A QFX Series Virtual Chassis is a Virtual Chassis composed of QFX3500 series switches, QFX3600 series switches, QFX5100 switches, or a mix of QFX Series switches. A QFX Series Virtual Chassis can also include EX4300 switches.

Before you begin, be sure you have:

• Mounted the new switch in a rack.
• Enabled automatic software update on the Virtual Chassis. See Configuring Automatic Software Update on Virtual Chassis Member Switches (CLI Procedure).
• If you are expanding a preprovisioned configuration, made a note of the serial number (the number is on the back of the switch). You will need to edit the Virtual Chassis configuration to include the serial number of the new member switch.
• If you are expanding a preprovisioned configuration, edited the existing Virtual Chassis configuration to include the serial number of the new member switch. The parameters specified in the master Virtual Chassis configuration file are applied to the new switch after it has been interconnected to an existing member switch.

  Note: If you are expanding a preprovisioned Virtual Chassis configuration, you can use the autoprovisioning feature to add member switches to that configuration.

• (Optional) Configured Ethernet interfaces on different member switches into the same LAG. See Configuring Link Aggregation.

  An active member switch might temporarily go down before coming back up as part of this procedure. Having traffic load-balanced across member switches using a LAG helps alleviate traffic loss during this procedure.

1. If the new member switch has been previously configured, revert that switch’s configuration to the factory defaults before interconnecting it into the Virtual Chassis. See Reverting to the Default Factory Configuration.
2. (Required for a mixed Virtual Chassis only) Set the new switch into mixed mode, and reboot the switch to complete the configuration:

   Note: You do not need to configure your Virtual Chassis into mixed mode if the Virtual Chassis is composed of QFX3500 and QFX3600 switches only.

   user@device> request virtual-chassis mode mixed reboot


   If you are adding a switch that converts a non-mixed Virtual Chassis into a mixed Virtual Chassis, you must also log onto the Virtual Chassis and enter the request virtual-chassis mode mixed all-members reboot command either before or after interconnecting the new switch into your Virtual Chassis.

3. Interconnect the new switch to one member of the existing Virtual Chassis. You interconnect the new member switch using a non-channelized QSFP+ interface or SFP+ interface.

   Connect only one interface on the unpowered new switch to a VCP on a member switch in the existing Virtual Chassis at this point of the procedure.

4. Set the interface on the new member switch as a Virtual Chassis Port (VCP):
   
user@switch> request virtual-chassis vc-port set pic-slot slot-number port port-number
5. Confirm that the new member switch is now included within the Virtual Chassis configuration by entering the show virtual-chassis command. The new member switch should be listed in the output and the Status is Prsnt.
6. Cable the next port into the Virtual Chassis, using Steps 2 through 5.

   Caution: If you immediately cable both VCPs on the new switch into the existing Virtual Chassis at the same time, a member switch that was already part of the Virtual Chassis might become nonoperational for several seconds. Network traffic to this switch is dropped during the downtime. The member switch will return to the normal operational state with no user intervention, and normal operation of the Virtual Chassis will resume after this downtime.

7. If further Virtual Chassis configuration is needed, see Configuring a QFX Series Virtual Chassis (CLI Procedure).