configure isis restart
Description
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. |
Default
None.
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.
![Note](../../images/Note_Note.png)
Note
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.
Example
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
History
This command was first available in ExtremeXOS 12.1.
Platform Availability
This command is available on platforms with a Core license.