Configuring Bfd For Bgp - Dell Force10 C150 Configuration Manual

Configuring BFD for BGP

BFD for BGP is only supported on platforms:
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 perform the following tasks:
1. Configure BGP on the routers that you want to interconnect as described in
page 225.
2. Enable fast fall-over for BGP neighbors to reduce convergence time (
described in
Establishing sessions with BGP neighbors
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.
Figure 9-13. BFD Session Between BGP Neighbors
Interior BGP
AS 1
Force10(conf )# bfd enable
Force10(conf )# router bgp 1
Force10(conf-router-bgp)# neighbor 2.2.4.3 remote-as 2
Force10(conf-router-bgp)# neighbor 2.2.4.3 no shutdown
Force10(conf-router-bgp)# bfd all-neighbors interval 200 min_rx 200
multiplier 6 role active
OR
Force10(conf-router-bgp)# neighbor 2.2.4.3 bfd
BGP fast fall-over on page
Router 1
2/2
2.2.4.2
Exterior BGP
e c
235.
Interior BGP
Router 2
1/1
2.2.4.3
AS 2
Force10(conf )# bfd enable
Force10(conf )# router bgp 2
Force10(conf-router-bgp)# neighbor 2.2.4.2 remote-as 1
Force10(conf-router-bgp)# neighbor 2.2.4.2 no shutdown
Force10(conf-router-bgp)# bfd all-neighbors interval 200 min_rx 200
multiplier 6 role active
OR
Force10(conf-router-bgp)# neighbor 2.2.4.2 bfd
BGP Configuration on
neighbor fall-over
command) as
Bidirectional Forwarding Detection | 185