graceful-restart t1

Use graceful-restart t1 to set the T1 timer.

Use undo graceful-restart t1 to restore the default.

Syntax

graceful-restart t1 seconds count count

undo graceful-restart t1

Default

The T1 timer is 3 seconds and can expire 10 times.

Views

IS-IS view

Predefined user roles

network-admin

Parameters

seconds: Specifies the T1 timer in the range of 3 to 10 seconds.

count: Specifies the number of times that the T1 timer can expire, in the range of 1 to 20.

Usage guidelines

The T1 timer specifies the number of times that GR restarter can send a Restart TLV with the RR bit set. After restart, the GR restarter sends a Restart TLV with the RR bit set to its neighbor. If the restarting router receives a Restart TLV with the RA set from its neighbor before the T1 timer expires, the GR process starts. Otherwise, the GR process fails.

To ensure successful GR, follow these restrictions and guidelines when you configure the GR timers:

• The product of the T1 timer and the number of times that the T1 timer can expire must be smaller than the T2 timer.

• The T2 timer must be smaller than the T3 timer.

Examples

# Set the T1 timer of IS-IS process 1 to 5 seconds, and the expiration times to 5.

<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] graceful-restart t1 5 count 5

Related commands

graceful-restart

graceful-restart t2

graceful-restart t3