Deployment Guide

Version Description
8.2.1.0 Introduced BFD for OSPF and ISIS on the E-Series.
7.6.1.0 Introduced BFD for OSPF on the C-Series.
7.5.1.0 Introduced BFD for ISIS on the E-Series.
7.4.1.0 Introduced BFD for OSPF on the E-Series.
Usage Information
All neighbors inherit the timer values congured with the bfd neighbor command except in the following cases:
• Timer values congured with the isis bfd all-neighbors or ip ospf bfd all-neighbors
commands in INTERFACE mode override timer values congured 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 congured with the bfd neighbor command or congured for the peer group to which a neighbor
belongs. The neighbors inherit only the global timer values (congured with the bfd neighbor command).
You can only enable BFD for VRRP in INTERFACE command mode (vrrp bfd all-neighbors).
You can enable BFD on a nondefault VRF for OSPFv2.
bfd disable
Disable BFD on an interface.
Syntax
bfd disable
Re-enable BFD using the no bfd disable command.
Defaults BFD is disabled by default.
Command Modes INTERFACE VRRP
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.
bfd enable (Conguration)
Enable BFD on all interfaces.
Syntax
bfd enable
Disable BFD using the no bfd enable command.
Defaults BFD is disabled by default.
Command Modes CONFIGURATION
274 Bidirectional Forwarding Detection (BFD)