Users Guide

Conguring IS-IS Graceful Restart
To enable IS-IS graceful restart globally, use the following commands. Additionally, you can implement optional commands to enable the
graceful restart settings.
• Enable graceful restart on ISIS processes.
ROUTER-ISIS mode
graceful-restart ietf
• Congure the time during which the graceful restart attempt is prevented.
ROUTER-ISIS mode
graceful-restart interval minutes
The range is from 1 to 120 minutes.
The default is 5 minutes.
• Enable the graceful restart maximum wait time before a restarting peer comes up.
ROUTER-ISIS mode
graceful-restart restart-wait seconds
When implementing this command, be sure to set the t3 timer to adjacency on the restarting router.
The range is from 1 to 120 minutes.
The default is 30 seconds.
• Congure the time that the graceful restart timer T1 denes for a restarting router to use for each interface, as an interval before
regenerating Restart Request (an IIH with RR bit set in Restart TLV) after waiting for an acknowledgement.
ROUTER-ISIS mode
graceful-restart t1 {interval seconds | retry-times value}
• interval: wait time (the range is from 5 to 120. The default is 5.)
• retry-times: number of times an unacknowledged restart request is sent before the restarting router gives up the graceful
restart engagement with the neighbor. (The range is from 1 to 10 attempts. The default is
1.)
• Congure the time for the graceful restart timer T2 that a restarting router uses as the wait time for each database to synchronize.
ROUTER-ISIS mode
graceful-restart t2 {level-1 | level-2} seconds
• level-1, level-2: identies the database instance type to which the wait interval applies.
The range is from 5 to 120 seconds.
The default is 30 seconds.
• Congure graceful restart timer T3 to set the time used by the restarting router as an overall maximum time to wait for database
synchronization to complete.
ROUTER-ISIS mode
graceful-restart t3 {adjacency | manual seconds}
• adjacency: the restarting router receives the remaining time value from its peer and adjusts its T3 value so if user has congured
this option.
• manual: allows you to specify a xed value that the restarting router should use.
The range is from 50 to 120 seconds.
The default is 30 seconds.
Intermediate System to Intermediate System
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