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CLI-based Configuration Guide - Reliability

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.

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A link failure or topology change may lead to route recalculation. Therefore, the convergence of routing protocols must be shortened as much as possible to improve network performance. A possible solution is to quickly detect link faults and immediately notify routing protocols of the faults.

D for OSPF associates a BFD session with OSPF. The BFD session quickly detects a link fault and notifies OSPF of the fault. OSPF quickly responds to the network topology change. Table 6-1 lists OSPF convergence speed.

Table 6-1  OSPF convergence speed

BFD Session

Link Fault Detection Mechanism

Convergence Speed

Not bound

Timeout of the OSPF Hello keepalive timer

At the second level


BFD session in Down state

At the millisecond level


Figure 6-8  BFD for OSPF

In Figure 6-8, RouterA establishes OSPF neighbor relationships with RouterC and RouterD. The outbound interface in the route from RouterA to RouterB is Interface 1. Packets from RouterA traverse RouterC, and then reach RouterB. When the OSPF neighbor is in Full state, the system instructs BFD to create a BFD session.

If a fault occurs on the link between RouterA and RouterC, the BFD session detects the fault and notifies RouterA. RouterA processes the neighbor Down event and recalculates the route.Interface 2 then becomes the new outbound interface in the route. Packets from RouterA traverse RouterD, and then reach RouterB.

Updated: 2019-08-12

Document ID: EDOC1100034076

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