Configuring a One-Arm BFD Echo Session

This section describes how to configure a one-arm BFD echo session to rapidly detect faults in the direct link between a device that supports BFD and a device that does not support BFD.

Usage Scenario

One-arm BFD echo is used when two devices are directly connected and only one of them supports BFD. A one-arm BFD echo session can be established on the device that supports BFD. After receiving a one-arm BFD echo session packet, the device that does not support BFD immediately loops back the packet, implementing quick link failure detection.

Pre-configuration Tasks

Before configuring a one-arm BFD echo session, complete the following tasks:

Connect interfaces.
Assign an IP address to each Layer 3 interface.

Enabling BFD Globally: BFD must be enabled globally before BFD is configured.

Creating a One-Arm BFD Echo Session: This section describes how to create a one-arm BFD echo session on a device that supports BFD.

(Optional) Changing the BFD Detection Time: This section describes how to change the BFD detection time to more efficiently use a BFD session to monitor links on a network.

(Optional) Setting the BFD WTR Time: You can set the BFD wait to restore (WTR) time to prevent an application from switching between the master and slave devices due to BFD session flapping.

(Optional) Configuring a Description for a BFD session: You can configure a description for a BFD session to identify this session.

(Optional) Setting the Priority of a BFD Session: You can set a priority for a BFD session. Packets of a BFD session with a higher priority are preferentially forwarded.

Verifying the One-Arm BFD Echo Session Configuration: After configuring a one-arm BFD echo session, verify the configurations.