Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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 20 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.

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)
                                 Database Sync count    : 0 (level-1), 0 (level-2)
                                 
                                 Circuit GigabitEthernet 2/10:
                                 Mode: Normal L1-State:NORMAL, L2-State: NORMAL
                                 
                                 L1: Send/Receive: RR:0/0, RA: 0/0, SA:0/0
                                 T1 time left: 0, retry count left:0
                                 
                                 L2: Send/Receive: RR:0/0, RA: 0/0, SA:0/0
                                 T1 time left: 0, retry count left:0
                                 Dell#
                              

Dell#show isis interface G1/34
                                 GigabitEthernet 2/10 is up, line protocol is up
                                 MTU 1497, Encapsulation SAP
                                 Routing Protocol: IS-IS
                                 Circuit Type: Level-1-2
                                 Interface Index 0x62cc03a, Local circuit ID 1
                                 Level-1 Metric: 10, Priority: 64, Circuit ID: 0000.0000.000B.01
                                 Hello Interval: 10, Hello Multiplier: 3, CSNP Interval: 10
                                 Number of active level-1 adjacencies: 1
                                 Level-2 Metric: 10, Priority: 64, Circuit ID: 0000.0000.000B.01
                                 Hello Interval: 10, Hello Multiplier: 3, CSNP Interval: 10
                                 Number of active level-2 adjacencies: 1
                                 Next IS-IS LAN Level-1 Hello in 4 seconds
                                 Next IS-IS LAN Level-2 Hello in 6 seconds
                                 LSP Interval: 33 Next IS-IS LAN Level-1 Hello in 4 seconds
                                 Next IS-IS LAN Level-2 Hello in 6 seconds
                                 LSP Interval: 33
                                 Restart Capable Neighbors: 2, In Start: 0, In Restart: 0
                                 Dell#