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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 BFD for OSPF

Configuring BFD for OSPF

If requirements for data transmission are high, and OSPF convergence speed needs to be improved when the link status changes, you can configure BFD on OSPF links. After detecting a link failure, BFD notifies the routing protocol of the failure, which triggers fast convergence. When the neighbor relationship becomes Down, the BFD session is deleted dynamically.

Applicable Environment

NOTE:
BFD for routing protocols can only be configured on GRE tunnel interfaces.

OSPF enables the router to periodically send Hello packets to a neighboring router for fault detection. Detecting a fault takes more than 1s. As technologies develop, voice, video, and other VoD services are widely used. These services are quite sensitive to packet loss and delays. When traffic is transmitted at gigabit rates, long-time fault detection will cause packet loss. This prolonged detection period cannot meet high reliability requirements of the carrier-class network.

BFD for OSPF is introduced to resolve this problem. After BFD for OSPF is configured in a specified process or on a specified interface, the link status can be rapidly detected and fault detection can be completed in milliseconds. This speeds up OSPF convergence when the link status changes.

NOTE:

If the change of bound peer IP address causes a route to switch to another link, the BFD session is negotiated again only when the original link fails.

Pre-configuration Tasks

Before configuring BFD for OSPF, complete the following tasks:

Configuration Procedure

Figure 5-34 Flowchart of configuring BFD for OSPF
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Updated: 2019-05-17

Document ID: EDOC1000174069

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