CLI Guide

The default is active.
Defaults Refer to Parameters.
Command Modes
ROUTER OSPF
ROUTER OSPFv3
ROUTER BGP
ROUTER ISIS
INTERFACE (BFD for VRRP only)
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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 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).
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.
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Bidirectional Forwarding Detection (BFD)