Configuring Graceful Restart for MPLS-Related Protocols

To configure graceful restart globally for all MPLS-related protocols, include the graceful-restart statement at the [edit routing-options] hierarchy level. To configure the duration of the graceful restart period, include the restart-duration at the [edit routing-options graceful-restart] hierarchy level:

To disable graceful restart globally, include the disable statement at the [edit routing-options graceful-restart] hierarchy level.

Because CCC and TCC rely on RSVP, you must modify these three protocols as a single group.

To configure how long the router retains the state of its RSVP neighbors while they undergo a graceful restart, include the maximum-helper-recovery-time statement at the [edit protocols rsvp graceful-restart] hierarchy level. This value is applied to all neighboring routers, so it should be based on the time required by the slowest RSVP neighbor to recover.

To configure the delay between when the router discovers that a neighboring router has gone down and when it declares the neighbor down, include the maximum-helper-restart-time statement at the [edit protocols rsvp graceful-restart] hierarchy level. This value is applied to all neighboring routers, so it should be based on the time required by the slowest RSVP neighbor to restart.

To disable RSVP, CCC, and TCC graceful restart, include the disable statement at the [edit protocols rsvp graceful-restart] hierarchy level. To disable RSVP, CCC, and TCC helper capability, include the helper-disable statement at the [edit protocols rsvp graceful-restart] hierarchy level.

When configuring graceful restart for LDP, you can include the following optional statements at the [edit protocols ldp graceful-restart] hierarchy level:

The statements have the following effects on the graceful restart process:

• To configure the length of time required to reestablish a session after a graceful restart, include the reconnect-time statement; the range is 30 through 300 seconds. To limit the maximum reconnect time allowed from a restarting neighbor router, include the maximum-neighbor-reconnect-time statement; the range is 30 through 300 seconds.

• To configure the length of time that helper routers are required to maintain the old forwarding state during a graceful restart, include the recovery-time statement; the range is 120 through 1800 seconds. On the helper router, you can configure a statement that overrides the request from the restarting router and sets the maximum length of time the helper router will maintain the old forwarding state. To configure this feature, include the maximum-neighbor-recovery-time statement; the range is 140 through 1900 seconds.

  Note:

  The value for the recovery-time and maximum-neighbor-recovery-time statements at the [edit protocols ldp graceful-restart] hierarchy level should be approximately 80 seconds longer than the value for the restart-duration statement at the [edit routing-options graceful-restart] hierarchy level. Otherwise, a warning message appears when you try to commit the configuration.

• To disable LDP graceful restart capability, include the disable statement. To disable LDP graceful restart helper capability, include the helper-disable statement.