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graceful-restart (Protocols IS-IS)

 

Syntax

Hierarchy Level

Release Information

Statement introduced before Junos OS Release 7.4.

Description

Configure graceful restart parameters for IS-IS.

Graceful restart allows a routing device to restart with minimal effects to the network, and is enabled for all routing protocols at the [edit routing-options] hierarchy level. When graceful restart 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.

On LAN interfaces where IS-IS is configured on a transit router that serves as the designated router (DR), a graceful restart causes:

  • The ingress router of the label-switched path (LSP), which passes through the DR, to break the LSP.

  • The ingress router to re-signal the LSP.

Options

disable—Disable graceful restart for IS-IS.

helper-disable—Disable graceful restart helper capability. Helper mode is enabled by default.

restart-duration seconds—Time period for the restart to last, in seconds.

Range: 30 through 300 seconds

Default: 30 seconds

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.