Description

A virtual chassis is a scalable switch composed of multiple interconnected switches. When any of these switches fails, it needs to be replaced with a spare device.

This article explains how to replace the switch on the VC when using preprovisioned configuration.

Symptoms

A faulty switch in virtual chassis needs to be replaced:

 

user@switch> show virtual-chassis status
Preprovisioned Virtual Chassis
Virtual Chassis ID: 0000.e255.00e0
                                       Mastership             Neighbor List  
Member ID  Status  Serial No   Model     Priority  Role       ID, Interface 
0 (FPC 0)  Prsnt   abc123      ex4200-48p    129  Master*     1 vcp-0
                                                              2 vcp-1 
1 (FPC 1)  Prsnt   def456      ex4200-24t    129  Backup      2 vcp-0
                                                              0 vcp-1 
2 (FPC 2)  NotPrsnt abd231     ex4200-24p    0  Linecard       >>>>>>>>>>>>>>>faulty switch

Solution

NOTE:
If your Virtual Chassis is managed through Juniper Mist, you can configure and manage it through the Mist portal. To know more, see Virtual Chassis Overview (Mist).

1-Replace physically on the rack the faulty switch with the spare switch.

2-Make sure the spare switch is running the same Junos version as the rest of the virtual chassis members.

3-Turn off the spare switch.

4-Connect one virtual chassis port from the spare switch into one of the virtual chassis ports on any current members of the virtual chassis.

5-Change the configuration on the Master of the Virtual Chassis to replace the Serial Number of the faulty switch with the Serial Number of the spare switch

[edit virtual-chassis]
user@switch# delete member 2 serial-number abd231
user@switch# set member 2 serial-number ghi789 role line-card

6-Power on the spare switch

7-Once detected, new switch should show as a 'Present' member on the virtual chassis:

user@switch> show virtual-chassis status
Preprovisioned Virtual Chassis
Virtual Chassis ID: 0000.e255.00e0
                                       Mastership             Neighbor List  
Member ID  Status  Serial No   Model     Priority  Role       ID, Interface 
0 (FPC 0)  Prsnt   abc123      ex4200-48p    129  Master*     1 vcp-0
                                                              2 vcp-1 
1 (FPC 1)  Prsnt   def456      ex4200-24t    129  Backup      2 vcp-0
                                                              0 vcp-1 
2 (FPC 2)  Prsnt   ghi789      ex4200-24p    0  Linecard      0 vcp-0
                                                              
8-Connect secondary virtual chassis port to closed the redundant loop between virtual chassis members.

 

 

Modification History

5/24/2023 - First version