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Configuring 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
• Configure 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.
• Configure the time that the graceful restart timer T1 defines 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.)
• Configure 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: identifies the database instance type to which the wait interval applies.
The range is from 5 to 120 seconds.
The default is 30 seconds.
• Configure 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}
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