Connectivity Guide

BFD for BGP example
In this BFD for BGP conguration example, Router 1 and Router 2 use eBGP in a transit network to interconnect AS1 and AS2. The eBGP
routers exchange information with each other and with iBGP routers to maintain connectivity and accessibility within each autonomous
system.
When you congure a BFD session with a BGP neighbor, you can:
• Establish a BFD session with a specied BGP neighbor using the neighbor ip-address and bfd commands.
• Establish BFD sessions with all neighbors discovered by BGP using the bfd all-neighbors command.
For example:
Router 1
OS10(conf)# bfd enable
OS10(conf)# router bgp 1
OS10(config-router-bgp-1)# neighbor 2.2.4.3
OS10(config-router-neighbor)# bfd
OS10(config-router-neighbor)# no shutdown
OR
OS10(conf)# bfd enable
OS10(conf)# router bgp 1
OS10(config-router-bgp-1)# bfd all-neighbors interval 200 min_rx 200 multiplier 6 role active
Router 2
OS10(conf)# bfd enable
OS10(conf)# router bgp 2
OS10(config-router-bgp-2)# neighbor 2.2.4.2
OS10(config-router-neighbor)# bfd
OS10(config-router-neighbor)# no shutdown
OR
OS10(conf)# bfd enable
OS10(conf)# router bgp 2
OS10(conf-router-bgp-2)# bfd all-neighbors interval 200 min_rx 200 multiplier 6 role active
BFD packets originating from a router are assigned to the highest priority egress queue to minimize transmission delays. Incoming BFD
control packets received from the BGP neighbor are assigned to the highest priority queue within the control plane policing (CoPP)
framework to avoid BFD packets drops due to queue congestion.
BFD noties BGP of any failure conditions that it detects on the link. BGP initiates recovery actions.
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Layer 3