Bidirectional Forwarding Detection

Bidirectional Forwarding Detection

Bidirectional Forwarding Detection (BFD) is a UDP-based protocol that provides fast (very fast!) routing protocol independent detection of layer-3 next hop failures. BFD can be used to replace the routing protocol timers with a fast and reliable failure detection mechanism. BFD also provides low-overhead detection of faults even on interfaces that don’t support failure detection of any kind, such as Ethernet, virtual circuits, tunnels and MPLS Label Switched Paths.

 

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