Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces
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provides a mechanism to detect faults in the bidirectional path
between two forwarding engines, including interfaces, data links, and
to the extent possible the forwarding engines themselves, with
potentially very low latency. The BFD protocol also provides a fast
mechanism for detecting communication failures on any data links and
the protocol can run over any media and at any protocol layer.