DELL S50V User Manual

Bidirectional Forwarding Detection | 185

BFD for BGP is only supported on platforms: 

e c 

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 

.

2. Enable fast fall-over for BGP neighbors to reduce convergence time (

neighbor fall-over

 command) as 

.

Establishing sessions with BGP neighbors

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.

AS 1

AS 2

Router 1

Router 2

Interior BGP

Exterior BGP

Interior BGP

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2.2.4.3

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 

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 

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2.2.4.2