Reference Guide

Bidirectional Forwarding Detection (BFD) | 165
To change parameters for IS-IS sessions on an interface:
View session parameters using the command
show bfd neighbors detail, as shown in Figure 8-18.
Disabling BFD for IS-IS
If BFD is disabled globally, all sessions are torn down, and sessions on the remote system are placed in a
Down state. If BFD is disabled on an interface, sessions on the interface are torn down, and sessions on the
remote system are placed in a Down state (Message 3). Disabling BFD does not trigger a change in BFD
clients; a final Admin Down packet is sent before the session is terminated.
To disable BFD sessions with all IS-IS neighbors:
To disable BFD sessions with all IS-IS neighbors out of an interface:
Configuring BFD for BGP
BFD for BGP is only supported on the S5000 platform.
In a BGP core network, BFD provides rapid detection of communication failures in BGP fast-forwarding
paths between internal BGP (iBGP) and external BGP (eBGP) peers for faster network reconvergence.
BFD for BGP is supported on 1GE, 10GE, 40GE, port-channel, and VLAN interfaces. BFD for BGP does
not support IPv6 and the BGP multihop feature.
Prerequisites
Before configuring BFD for BGP, you must first configure the following settings:
1. Configure BGP on the routers that you want to interconnect as described in Chapter 9, Border
Gateway Protocol IPv4 (BGPv4).
Step Task Command Syntax Command Mode
1 Change parameters for all IS-IS
sessions out of an interface.
isis bfd all-neighbors interval milliseconds
min_rx milliseconds multiplier value role
[active | passive]
INTERFACE
Step Task Command Syntax Command Mode
1 Disable BFD sessions with all IS-IS
neighbors.
no bfd all-neighbors ROUTER-ISIS
Step Task Command Syntax Command Mode
1 Disable BFD sessions with all IS-IS
neighbors out of an interface.
isis bfd all-neighbors disable INTERFACE