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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Configuring OSPF IP FRR

Configuring OSPF IP FRR

In the case of a link fault, a device enabled with OSPF IP FRR can fast switch traffic to the backup link. This protects traffic and greatly improves the reliability of OSPF networks.


With the development of networks, Voice over IP (VoIP) and on-line video services require high-quality real-time transmission. Nevertheless, if an OSPF fault occurs, traffic can be switched to a new link only after the following processes: fault detection at the millisecond level, notifying the fault to the routing control plane at the millisecond level, generating and flooding new topology information at the tens of milliseconds level, triggering SPF calculation at the tens of milliseconds level, and notifying and installing a new route at the hundreds-of-milliseconds level. As a result, it takes much more than 50 ms to recovery the link from the fault, which cannot meet the requirement for real-time services on the network.

OSPF IP FRR can work with BFD to implement protection switchover within 50 ms. With OSPF IP FRR that calculates a backup link in advance, devices can fast switch traffic to the backup link without interrupting traffic when the primary link becomes faulty. This protects traffic and thus greatly improves the reliability of OSPF networks.

OSPF IP FRR is applicable to the services that are sensitive to packet delay and packet loss.

AR100&AR120&AR150&AR160&AR200 series do not support OSPF IP FRR.

Pre-configuration Tasks

Before configuring OSPF IP FRR, complete the following tasks:

Configuration Procedure

Figure 5-33 Flowchart for configuring OSPF IP FRR

Updated: 2019-12-27

Document ID: EDOC1000174069

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