The following timers are implemented to ensure the successful operation of RSVP-TE:
bypass-resignal-timer — the bypass resignal timer defines the time between the global reoptimization of all dynamic bypass RSVP-TE LSPs. For more information, see Bypass Resignal Timer.
hold-timer — the hold timer defines the amount of time before an LSP is brought up and is in service, which provides protection against unreliable nodes and links
resignal-timer — the resignal timer is used in conjunction with the route optimization process, especially after a reroute has occurred. If the newly computed path for an LSP has a better metric than the currently recorded hop list, an attempt is made to resignal that LSP, and if the attempt is successful, a make-before-break switchover occurs. If the attempt to resignal an LSP fails, the LSP continues to use the existing path and another resignal attempt is made the next time the timer expires.
When the resignal timer expires, a trap and syslog message are generated.
retry-timer — the retry timer defines a period of time before a resignal attempt is made after an LSP failure. This delay time protects network resources against excessive signaling overhead.