4 Implement a wide metric-style globally.ROUTER ISIS AF IPV6 modeisis ipv6 metric metric-value [level-1 | level-2 | level-1-2]To configure wide or wide transition metric style, the cost can be between 0 and 16,777,215.Configuring IS-IS Graceful RestartTo enable IS-IS graceful restart globally, use the following commands. Additionally, you can implement optional commands to enable thegraceful restart settings.• Enable graceful restart on ISIS processes.ROUTER-ISIS modegraceful-restart ietf• Configure the time during which the graceful restart attempt is prevented.ROUTER-ISIS modegraceful-restart interval minutesThe 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 modegraceful-restart restart-wait secondsWhen 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 beforeregenerating Restart Request (an IIH with RR bit set in Restart TLV) after waiting for an acknowledgement.ROUTER-ISIS modegraceful-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 gracefulrestart 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 modegraceful-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 databasesynchronization to complete.ROUTER-ISIS modegraceful-restart t3 {adjacency | manual seconds}Intermediate System to Intermediate System 487
