After a maintenance window to install JSU packages on both Routing Engines of the router labrouter, the customer observed that the logical system named labrouter_LS does not list any interfaces, despite the configuration being present.

The below steps were performed by customter 

• Disabled GRES, NSR, and other features on the master Routing Engine (RE0)
• Restarted chassis-control on the backup RE (RE1) after the installtion of JSU Package 
• Mastership switched to RE1 (without GRES)
• Restarted chassis-control on RE0 after the installtion of JSU Package 
• Enabled GRES, NSR, and other features on RE1 (now master)
• Mastership switched to RE0
• Mastership switched to RE1
• Mastership switched to RE0
• Mastership switched to RE1
• Disabled GRES/NSR on RE1 (master)
• Mastership switched to RE0 (without GRES/NSR)
• GRES/NSR activated on master Routing Engine (RE0)

Hostname: re0.labrouter

Model: mx960

Junos: 21.2X8.1

JUNOS Selective Update J1.1 (for: /usr/share/pfe/mpc-2e-3e-ng.jbf /usr/share/pfe/npc.jbf /usr/share/pfe/rmpc.jbf /usr/share/pfe/smpc.elf /usr/share/pfe/smpc_re.elf) [21.2X8-J1.1]

{master}

[email protected]:labrouter_LS> show interfaces terse 

Oct 02 12:43:41

error: Logical system labrouter_LS unknown

The recommended restoration step is to perform a graceful mastership switchover.

• Deactivate GRES/NSR
• Reboot the backup Routing Engine (RE)
• Reactivate GRES/NSR
• Perform a graceful mastership switchover