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.

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