# Configuring RSVP-TE Graceful Restart

Configure RSVP-TE graceful restart to enable routers to maintain MPLS forwarding state when a link or node failure occurs. Becasue forwarding state is maintained, traffic can continue to be forwarded while RSVP-TE restarts and recovers. The RSVP-TE graceful restart feature enables an LSR to gracefully restart, to act as a graceful restart helper node for a neighboring router that is restarting, or both.

To configure RSVP-TE graceful restart on the current VR so that the LSR acts as both a graceful restart restarting node and a graceful restart helper node:

1. Enable RSVP-TE graceful restart on the current virtual router.
   host1(config)#mpls rsvp signalling hello graceful-restart
2. (Optional) Configure the recovery time—the time within which you want neighboring routers to resynchronize RSVP-TE state and MPLS forwarding state after a graceful restart.
   host1(configf)#mpls rsvp signalling hello graceful-restart recovery-time 140000
3. (Optional) Configure the restart time—the time within which the sender gracefully restarts RSVP-TE and reestablishes hello communication with RSVP-TE neighbors.
   host1(configf)#mpls rsvp signalling hello graceful-restart refresh restart-time 150000

To configure RSVP-TE graceful restart on the current VR so that the LSR acts as only a graceful restart helper node for neighbors that support RSVP-TE graceful restart:

- Issue the mpls rsvp signalling hello graceful-restart mode help-neighbor command:
  host1(config)#mpls rsvp signalling hello graceful-restart mode help-neighbor

#### Related Documentation

- Basic MPLS Configuration Tasks
- Additional RSVP-TE Configuration Tasks
- mpls rsvp signalling hello graceful-restart
- mpls rsvp signalling hello graceful-restart recovery-time
- mpls rsvp signalling hello graceful-restart restart-time