How to configure the BFD echo function for S series switches

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You can configure BFD echo on S series switches (except S1700 switches) to achieve rapid detection of link failures. The networking is shown as follows:
SwitchA(10.1.1.5/24)---(10.1.1.6/24)SwitchB
Switch A and Switch B are directly connected through a link. SwitchA supports BFD, while SwitchB does not. Perform the following configuration:
[SwitchA] bfd //Enable BFD.
[SwitchA-bfd] quit
[SwitchA] bfd atob bind peer-ip 10.1.1.6 interface vlanif13 source-ip 10.1.1.5 one-arm-echo //Create a BFD echo session.
[SwitchA-bfd-session-atob] discriminator local 1 //Configure the BFD echo session identifier.
[SwitchA-bfd-session-atob] commit

Other related questions:
For S series switches, whether the BFD echo function supports multi-hop BFD sessions
For S series switches (except S1700), BFD echo is applicable only to single-hop BFD sessions. Between two directly connected switches, one switch supports BFD, but the other does not support BFD and supports only forwarding at the network layer. To rapidly detect forwarding failures between the two switches, configure the BFD echo function on the BFD-supported device. The BFD-supported switch sends an Echo Request to the remote device, and the remote device sends the Echo Request back along the same path to detect the connectivity of the forwarding link.

Is the BFD Echo function applicable to multi-hop BFD sessions
The BFD Echo function is only applicable to single-hop BFD sessions. For two directly connected devices, one device supports BFD, and the other device supports only forwarding at the network layer and does not support BFD. To rapidly detect forwarding failures between the two devices, configure the BFD Echo function on the BFD-supporting device. The BFD-supporting device sends an Echo Request packet to the remote device, and the remote device sends the Echo Request packet back along the same path to detect the connectivity of the forwarding link.

Whether the one-arm BFD echo function supports multi-hop on the AR
The one-arm BFD echo function is only applicable to single-hop BFD sessions. For two directly connected devices, one device supports BFD, and the other device supports only forwarding at the network layer and does not support BFD. To rapidly detect forwarding failures between the two devices, configure the one-arm BFD echo function on the BFD-supporting device. The BFD-supporting device sends an Echo Request packet to the remote device, and the remote device sends the Echo Request packet back along the same path to detect the connectivity of the forwarding link.

Can S series switches support BFD
S series switches' (except S1700 switches) support for BFD is described as follows: - S2700 series: not supported - S3700 series: not supported by SI series, but supported by EI and HI series - S5700 series: not supported by SI and LI series, but supported by EI and HI series - S6700 series: supported - S7700 series: supported - S9700 series: supported - S9300 series: supported - S12700 series: supported

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