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.

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