Configuring Graceful Restart for IS-IS

Graceful restart allows a routing device to restart with minimal effects to the network, and is enabled globally for all routing protocols at the [edit routing-options] hierarchy level. When graceful restart for IS-IS is enabled, the restarting routing device is not removed from the network topology during the restart period. The adjacencies are reestablished after restart is complete.

You can configure graceful restart parameters specifically for IS-IS. To do this, include the graceful-restart statement:

For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.

To disable graceful restart for IS-IS, specify the disable statement. Helper mode is enabled by default. To disable the graceful restart helper capability, specify the helper-disable statement. To configure a time period for complete restart, specify the restart-duration statement. You can specify a number between 1 and 3600. The default value is 90 seconds.