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
• ip route bfd
• neighbor bfd
• neighbor bfd disable
• show bfd neighbors
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.
min_rx
milliseconds
Enter the keyword min_rx to specify the minimum rate at which
the local system would like to receive control packets from the
remote system. The range is from 50 to 1000. The default is
200.
multiplier value Enter the keyword multiplier to specify the number of
packets that must be missed in order to declare a session down.
The range is from 3 to 50. The default is 3.
role [active |
passive]
Enter the role that the local system assumes:
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