Configuring IPv6 IS-IS Auto FRR
Applicable Environment
As the network keeps developing, services such as Voice over IP (VoIP) and on-line video services require high-quality real-time transmission. Nevertheless, if an IS-IS fault occurs, traffic can be switched to a new link only after the following processes: fault detection, LSP update, LSP flooding, route calculation, and FIB entry delivery. As a result, traffic is interrupted for much more than 50 ms, which cannot meet the requirement for real-time services on the network.
With IPv6 IS-IS Auto FRR, devices can rapidly switch traffic from faulty links to backup links without interrupting the traffic. This protects traffic and greatly improves the reliability of IS-IS networks.
IPv6 IS-IS Auto FRR is applicable to the services that are very sensitive to packet delay and packet loss.
Procedure
- Run system-view
The system view is displayed.
- Run isis [ process-id ]
The IS-IS process is enabled and the IS-IS view is displayed.
- Run ipv6 frr
The IPv6 IS-IS FRR view is displayed.
- (Optional) Run frr-policy route route-policy route-policy-name
Backup routes are filtered using a filtering policy. Only backup routes that have passed the filtering policy are added to the routing table.
- Run loop-free-alternate [ level-1 | level-2 | level-1-2 ]
IPv6 IS-IS Auto FRR is enabled and the loop-free backup route is created.
If the IS-IS level is not specified, IPv6 IS-IS Auto FRR is enabled on Level-1 and Level-2 to create the backup route.
- Run commit
The configuration is committed.