Reference Guide

Defaults Refer to Parameters .
Command Modes
ROUTER OSPF
ROUTER OSPFv3
ROUTER BGP
ROUTER ISIS
INTERFACE (BFD for VRRP only)
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 9.2.(0.0) Introduced BFD for VRRP and OSPFv3 on Z9000, S4810, and S4820T.
Version 9.0.0.0 Introduced BFD for BGP on the Z9000.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.8.0 Introduced BFD for BGP on the S4810.
Version 8.4.1.3 Introduced BFD for BGP on the E-Series ExaScale.
Version 8.2.1.0 Introduced BFD for OSPF and ISIS on the E-Series ExaScale.
Version 7.6.1.0 Introduced BFD for OSPF on the C-Series.
Version 7.5.1.0 Introduced BFD for ISIS on the E-Series.
Version 7.4.1.0 Introduced BFD for OSPF on the E-Series.
Usage
Information
All neighbors inherit the timer values configured with the bfd neighbor command except
in the following cases:
• Timer values configured with the isis bfd all-neighbors or ip ospf bfd
all-neighbors commands in INTERFACE mode override timer values configured
with the bfd neighbor command. Likewise, using the no bfd neighbor
command does not disable BFD on an interface if you explicitly enable BFD using the
isis bfd all-neighbors command.
• Neighbors that have been explicitly enabled or disabled for a BFD session with the
bfd neighbor or neighbor bfd disable commands in ROUTER BGP mode
do not inherit the global BFD enable/disable values configured with the
bfd
neighbor command or configured for the peer group to which a neighbor belongs.
The neighbors inherit only the global timer values (configured with the bfd
neighbor
command).
You can only enable BFD for VRRP in INTERFACE command mode (vrrp bfd all-
neighbors).
Related
Commands
show bfd neighbors — displays BFD neighbor information on all interfaces or a specified
interface.
bfd neighbor — explicitly enables a BFD session with a BGP neighbor or a BGP peer group.
neighbor bfd disable — explicitly disables a BFD session with a BGP neighbor or a BGP peer
group.
266