Reference Guide

– 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}
– adjacency: the restarting router receives the remaining time value from its peer and adjusts its T3
value so if user has configured this option.
– manual: allows you to specify a fixed value that the restarting router should use.
The range is from 50 to 120 seconds.
The default is 30 seconds.
Example of the show isis graceful-restart detail Command
Example of the show isis interface Command
NOTE: If this timer expires before the synchronization has completed, the restarting router sends
the overload bit in the LSP. The 'overload' bit is an indication to the receiving router that database
synchronization did not complete at the restarting router.
To view all graceful restart-related configurations, use the show isis graceful-restart detail
command in EXEC Privilege mode.
Dell#show isis graceful-restart detail
Configured Timer Value
======================
Graceful Restart : Enabled
Interval/Blackout time : 1 min
T3 Timer : Manual
T3 Timeout Value : 30
T2 Timeout Value : 30 (level-1), 30 (level-2)
T1 Timeout Value : 5, retry count: 1
Adjacency wait time : 30
Operational Timer Value
======================
Current Mode/State : Normal/RUNNING
T3 Time left : 0
T2 Time left : 0 (level-1), 0 (level-2)
Restart ACK rcv count : 0 (level-1), 0 (level-2)
Restart Req rcv count : 0 (level-1), 0 (level-2)
Suppress Adj rcv count : 0 (level-1), 0 (level-2)
Restart CSNP rcv count : 0 (level-1), 0 (level-2)
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