An increasingly important feature of networking equipment is the
rapid detection of communication failures between adjacent systems,
in order to more quickly establish alternative paths. Detection can
come fairly quickly in certain circumstances when data link hardware
comes into play (such as Synchronous Optical Network (SONET) [...]
From the Mikrotik WIKI:
Bidirectional Forwarding Detection (BFD) is a protocol intended to detect faults in the bidirectional path between two forwarding engines, including physical interfaces, sub-interfaces, data link(s), and to the extent possible the forwarding engines themselves, with potentially very low latency. It operates independently of media, data protocols, and routing protocols.
BFD is basically a hello [...]
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