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

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Timers

Three timers are used to support IS-IS graceful restart functionality. After you enable graceful restart, these timers manage the graceful restart process.

There are three times, T1, T2, and T3.
  • The T1 timer specifies the wait time before unacknowledged restart requests are generated. This is the interval before the system sends a Restart Request (an IIH with the RR bit set in Restart TLV) until the complete sequence number PDU (CSNP) is received from the helping router. You can set the duration to a specific amount of time (seconds) or a number of attempts.
  • The T2 timer is the maximum time that the system waits for LSP database synchronization. This timer applies to the database type (level-1, level-2, or both).
  • The T3 timer sets the overall wait time after which the router determines that it has failed to achieve database synchronization (by setting the overload bit in its own LSP). You can base this timer on adjacency settings with the value derived from adjacent routers that are engaged in graceful restart recovery (the minimum of all the Remaining Time values advertised by the neighbors) or by setting a specific amount of time manually.

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