MPLS Process Restart

The MPLS process restart performs a cold reboot on crashing. All modules and processes that interact with MPLS adjust accordingly. All MPLS-based services, such as IPoMPLS, VLL, and VPLS are disrupted for the duration of MPLS process restart. Once the MPLS process is restarted, the control protocols (LDP and RSVP) re-signal the tunnels and cross-connects and subsequently, all dependent MPLS applications resume service.

MPLS Cold Process Restart User-Observable Behavior

All other non-MPLS services continue to function normally without any disruption due to MPLS process termination.
Traffic loss on applications using MPLS services until the MPLS process restarts and re-signaling are complete. VLL/VPLS and BGP IPoMPLS services are affected during MPLS process restart.
Any in progress (unacknowledged) MPLS configuration sessions will not be honored, and the user must reconfigure after the MPLS process comes back up. Attempts to configure or retrieve the operational state returns with an error.
Once MPLS process restarts, it comes up with the previous running configuration and proceeds to establish all sessions and tunnels. The dependent MPLS services are restored.
Existing configuration CLI sessions on MPLS process restart. Example: User was in the middle of configuring an LSP and MPLS process restarts, once MPLS is UP user can continue.
Existing display CLI sessions with respect to MPLS are continued.
No new MPLS configuration or display of operational information on MPLS is allowed during the time MPLS process is restarting.
Graceful restart of LDP has no effect as the MPLS entries are cleaned up from the forwarding layer.

To following command disables the MPLS process restart.

device# configure
device(config)# ha  
device(config-ha)# no process-restart mpls