Configure IS-IS GR

GR (Graceful Restart) is used to keep the route information of the forwarding layer of the local device and the neighbor device unchanged during the active/standby switchover, not affecting the forwarding. After switching the device and running again, the protocol layer of the two devices synchronizes the route information and updates the forwarding layer, so as to keep the data forwarding un-interrupted during the device switchover.

There are two roles in the GR process:

• GR Restarter: the device performing the protocol graceful restart
• GR Helper: the device helping the protocol graceful restart

The distributed device can act as GR Restarter and GR Helper, while the centralized device can only act as GR Helper, helping Restarter to complete GR.

Configuration Condition

Before configuring IS-IS GR, first complete the following task:

• Configure the IP address of the interface, making the neighboring node network layer reachable
• Enable the IS-IS protocol

Configure IS-IS GR Restarter

Table 9-36 Configure IS-IS GR Restarter

Configure IS-IS GR Helper

GR Helper helps Restarter to complete GR. By default, the device enables the function and the user can disable the function via the command.

Table 9-37 Configure IS-IS GR Restarter