Concept Guide

Prerequisites
Before conguring BFD for BGP, you must rst congure the following settings:
• Congure BGP on the routers that you want to interconnect.
Establishing Sessions with BGP Neighbors for Default VRF
To establish sessions with either IPv6 or IPv4 BGP neighbors for the default VRF, follow these steps:
1 Enable BFD globally.
CONFIGURATION mode
bfd enable
2 Specify the AS number and enter ROUTER BGP conguration mode.
CONFIGURATION mode
router bgp as-number
3 Add a BGP neighbor or peer group in a remote AS.
CONFIG-ROUTERBGP mode
neighbor {ip-address | peer-group name} remote-as as-number
4 Enable the BGP neighbor.
CONFIG-ROUTERBGP mode
neighbor {ip-address | peer-group-name} no shutdown
5 Add a BGP neighbor or peer group in a remote AS.
CONFIG-ROUTERBGP mode
neighbor {ipv6-address | peer-group name} remote-as as-number
6 Enable the BGP neighbor.
CONFIG-ROUTERBGP mode
neighbor { ipv6-address | peer-group-name} no shutdown
7 To establish BFD sessions for IPv6 neighbors, specify the address family as IPv6.
CONFIG-ROUTERBGP mode
address-family ipv6 unicast
8 Activate the neighbor in IPv6 address family.
CONFIG-ROUTERBGPv6_ADDRESSFAMILY mode
neighbor ipv6-address activate
9 Congure parameters for a BFD session established with all neighbors discovered by BGP. Or establish a BFD session with a specied
BGP neighbor or peer group using the default BFD session parameters.
CONFIG-ROUTERBGP mode
bfd all-neighbors
DellEMC(conf)#router bgp 1
DellEMC(conf-router_bgp)#neighbor 10.1.1.2 remote-as 2
DellEMC(conf-router_bgp)#neighbor 10.1.1.2 no shutdown
DellEMC(conf-router_bgp)#neighbor 20::2 remote-as 2
DellEMC(conf-router_bgp)#neighbor 20::2 no shutdown
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Bidirectional Forwarding Detection (BFD)