ip frr (system view)

Usage Scenario

With the development of the network, services such as audio, online video, and finance have more requirements for real time. Generally, active/standby links are deployed on the network to ensure service stability.

However, under traditional forwarding modes, when multiple routes to the same destination exist, switch selects the optimal route, which is delivered to FIB table to direct data forwarding. When the optimal link is faulty, switch waits for the completion of route convergence, then selects another optimal route, and then deliver the route to the FIB table. Then the service is recovered. This process leads to a long-time service interruption and cannot meet service requirements.

Using the ip frr command, you can enable IP FRR of the public network. IP FRR can specify a backup next hop and a backup interface and set backup forwarding information for IPv4 routes. When the active link is faulty, the system can switch the traffic immediately to the backup link. This process is irrelevant to route convergence and therefore services are interrupted for short time.

Pre-configuration Tasks

The ip frr command should be used with the apply backup-interface command and the apply backup-nexthop command. It is required to use the route-policy command to create route-policy at first, in which the apply backup-interface command and the apply backup-nexthop command are used to set a backup outbound interface and a backup next hop for IPv4 route of the public network.

Precautions

Only one policy can be used at one time. New configuration will replace the previous one if another policy is configured. Configuration in the system view and that in the VPN instance IPv4 address family view will not interfere each other.

Using the undo ip frr all command, IP FRR of all the public network and the private networks is disabled. Use it with caution.