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Prerequisites
Before conguring BFD for BGP, you must rst congure the following settings:
1 Congure BGP on the routers that you want to interconnect, as described in Border Gateway Protocol IPv4 (BGPv4).
2 Enable fast fall-over for BGP neighbors to reduce convergence time (the neighbor fall-over command), as described in BGP
Fast Fall-Over.
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
Bidirectional Forwarding Detection (BFD)
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