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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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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}
    • 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.

Examples of the show isis graceful-restart detail 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.

DellEMC#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 TenGigabitEthernet 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
DellEMC#

Example of the show isis interface Command

To view all interfaces configured with IS-IS routing along with the defaults, use the show isis interface command in EXEC Privilege mode.

DellEMC#show isis interface TenGigabitEthernet 1/34
TenGigabitEthernet 1/34 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
DellEMC#

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