configure isis restart

configure isis restart [ none | planned | unplanned | both ]


This command configures IS-IS graceful restart behavior.

Syntax Description

none Disables IS-IS graceful restart. When graceful restart is disabled, this router still operates as a helper to other restarting routers.
planned Initiates IS-IS graceful restart only in response to the restart process isis.
unplanned Initiates graceful restart only when the IS-IS process is restarted due to a process crash or an unplanned failover.
both Initiates graceful restart for all events supported by the planned and unplanned options.



Usage Guidelines

The command options specify under which circumstances graceful restart is to be performed. This command has no effect during normal switch boot up. All IS-IS routing processes in the current virtual router are affected by this command.

All neighboring routers must support IS-IS restart in order for graceful restart to work. If graceful restart is not performed after a process restart or failover, the router's adjacencies are re-initialized causing SPF recalculation throughout the network and, if the overload bit is not configured to be set during startup, churn as adjacencies change state and LSPs are learned.



The planned and unplanned command options do not affect the actual restart protocol operation of IS-IS; they only determine when the restart process occurs.


The following command configures the switch to initiate a graceful restart for all events supported by the planned and unplanned options:

configure isis restart both


This command was first available in ExtremeXOS 12.1.

Platform Availability

This command is available on platforms with a Premier license as described in the Switch Engine 32.2 Feature License Requirements document.