Reference Guide

Bidirectional Forwarding Detection (BFD) | 141
To disable BFD sessions with all OSPF neighbors:
To disable BFD sessions with all OSPF neighbors out of an interface:
Configuring BFD for BGP
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 10, Border
Gateway Protocol IPv4 (BGPv4), on page 179.
2. Enable fast fall-over for BGP neighbors to reduce convergence time (
neighbor fall-over command) as
described. in BGP fast fall-over on page 190.
Establishing sessions with BGP neighbors
Before configuring BFD for BGP, you must first configure BGP on the routers that you want to
interconnect. For more information, see Chapter 10, Border Gateway Protocol IPv4 (BGPv4), on page 159.
For example, Figure 9-13 shows a sample BFD configuration on Router 1 and Router 2 that use eBGP in a
transit network to interconnect AS1 and AS2. The eBGP routers exchange information with each other as
well as with iBGP routers to maintain connectivity and accessibility within each autonomous system.
Step Task Command Syntax Command Mode
1 Disable BFD sessions with all OSPF
neighbors.
no bfd all-neighbors
ROUTER-OSPF
Step Task Command Syntax Command Mode
1 Disable BFD sessions with all OSPF
neighbors out of an interface
ip ospf bfd all-neighbors disable
INTERFACE