RSVP Graceful Restart Terminology

The following terminology is specific to RSVP graceful restart:

Restart time (in milliseconds)—The default value is 60,000 milliseconds (1 minute). The restart time is advertised in the hello message. The time indicates how long a neighbor should wait to receive a hello message from a restarting router before declaring that router dead and purging states.
The JUNOS software can override a neighbor’s advertised restart time if the time is greater than one-third the local restart time. For example, given the default restart time of 60 seconds, a router would wait 20 seconds or less to receive a hello message from a restarting neighbor. If the restart time is zero, the restarting neighbor can immediately be declared dead.
Recovery time (in milliseconds)—Applies only when the control channel is up (the hello exchange is complete) before the restart time. Applies only to nodal faults.
When a graceful restart is in progress, the time left to complete a recovery is advertised. At other times, this value is zero. The maximum advertised recovery time is 2 minutes (120,000 milliseconds).

During the recovery time, a restarting node attempts to recover its lost states with assistance from its neighbors. The neighbor of the restarting node must send the path messages with the recovery labels to the restarting node within a period of one-half the recovery time. The restarting node considers its graceful restart complete after its advertised recovery time.