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CLI-based Configuration Guide - Reliability

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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BFD Echo Function

BFD Echo Function

The BFD Echo function checks the connectivity of the forwarding link by looping back packets. You can use the BFD Echo function when one of two directly connected devices does not support BFD. In this case, you can configure BFD Echo on the BFD-supporting device. That device sends an Echo Request packet to the remote device. The remote device then sends the Echo Request packet back along the same path to detect the connectivity of the forwarding link.

NOTE:

The BFD Echo function only applies to single-hop BFD sessions.

Application

Figure 6-6  BFD Echo

As shown in Figure 6-6, RouterA supports BFD, but RouterB does not. BFD Echo is configured on RouterA to monitor the connectivity of the single-hop path between RouterA and RouterB. Once RouterB receives a BFD Echo packet from RouterA, RouterB loops back the packet at the network layer.

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Updated: 2019-05-17

Document ID: EDOC1000174116

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