Dynamic routing terminology

Bidirectional forwarding detection (BFD)

Bi-directional Forwarding Detection (BFD) is a protocol used to quickly locate hardware failures in the network. Routers running BFD send packets to each other at a negotiated rate. If packets from a BFD-protected router fail to arrive, then that router is declared down. BFD communicates this information to the routing protocol and the routing information is updated.

BFD neighbors establish if BFD is enabled in OSPF or BFP routers that establish as neighbors. The CLI commands associated with BFD include:

config router bgp

config neighbor set bfd


config router ospf set bfd


Per-VDOM configuration:

config system settings set bfd

set bfd-desired-min-tx set bfd-required-min-rx set bfd-detect-mult

set bfd-dont-enforce-src-port end

Per-interface (override) configuration:

config system interface edit <interface_name>

set bfd enable

set bfd-desired-min-tx set bfd-detect-mult

set bfd-required-min-rx end

For more information about BFD in BGP, see Border Gateway Protocol (BGP) on page 338.

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