Users Guide

Bidirectional Forwarding Detection

(BFD)

Bidirectional forwarding detection (BFD) is a detection protocol that provides fast forwarding path failure

detection.

The Dell Networking OS implementation is based on the standards specified in the IETF Draft draft-ietf-bfd-

base-03, and supports BFD on all Layer 3 physical interfaces including VLAN interfaces and port-channels

Topics:

• bfd all-neighbors

• bfd disable

• bfd enable (Configuration)

• bfd enable (Interface)

• bfd interval

• bfd neighbor

• bfd protocol-liveness

• ip route bfd

• ipv6 ospf bfd all-neighbors

• isis bfd all-neighbors

• neighbor bfd

• neighbor bfd disable

• show bfd neighbors

• vrrp bfd neighbor

bfd all-neighbors

Enable BFD sessions with all neighbors discovered by Layer 3 protocols virtual router redundancy protocol

(VRRP), intermediate system to intermediate system (IS-IS), open shortest path first (OSPF), OSPFv3, or border

gateway protocol (BGP) on router interfaces, and (optionally) reconfigure the default timer values.

Syntax

bfd all-neighbors [interval interval min_rx min_rx multiplier

value role {active | passive}]

Parameters

interval

milliseconds

(OPTIONAL) Enter the keyword interval to specify non-

default BFD session parameters beginning with the transmission

interval. The range is from 50 to 1000. The default is 200.

Bidirectional Forwarding Detection (BFD) 417