Concept Guide

The default is Active.
Defaults See Parameters
Command Modes INTERFACE
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
This command provides the exibility to ne-tune the timer values based on individual interface needs when ISIS
BFD is congured in CONFIGURATION mode. Any timer values specied with this command overrides timers set
using the bfd all-neighbors command. Using the no form of this command does not disable BFD if BFD is
congured in CONFIGURATION mode.
To disable BFD on a specic interface while BFD is congured in CONFIGURATION mode, use the keyword
disable.
neighbor bfd
Explicitly enable a BFD session with a BGP neighbor or a BGP peer group.
Syntax
neighbor {ip-address | peer-group-name} bfd
Parameters
ip-address Enter the IP address of the BGP neighbor that you want to explicitly enable for BFD
sessions in dotted decimal format (A.B.C.D).
peer-group-name Enter the name of the peer group that you want to explicitly enable for BFD sessions.
Defaults none
Command Modes ROUTER BGP
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
When you enable a BFD session with a specied BGP neighbor or peer group using the bfd neighbor
command, the default BFD session parameters are used (interval: 200 milliseconds, min_rx: 200 milliseconds,
multiplier: 3 packets, and role: active) if you have not specied parameters with the bfd neighbor command.
When you explicitly enable a BGP neighbor for a BFD session with the bfd neighbor command:
• The neighbor does not inherit the global BFD enable values congured with the bfd neighbor command or
congured for the peer group to which the neighbor belongs.
284 Bidirectional Forwarding Detection (BFD)