Reference Guide

ROUTER BGP mode
no neighbor {ip-address | peer-group-name} bfd disable
Use BFD in a BGP Peer Group
You can establish a BFD session for the members of a peer group (the neighbor peer-group-name bfd command in
ROUTER BGP configuration mode).
Members of the peer group may have BFD:
● Explicitly enabled (the neighbor ip-address bfd command)
● Explicitly disabled (the neighbor ip-address bfd disable command)
● Inherited (neither explicitly enabled or disabled) according to the current BFD configuration of the peer group. For
information about BGP peer groups, refer to Configure Peer Groups.
If you explicitly enable (or disable) a BGP neighbor for BFD that belongs to a peer group:
● The neighbor does not inherit the BFD enable/disable values configured with the bfd all-neighbors command or
configured for the peer group to which the neighbor belongs.
● The neighbor inherits only the global timer values that are configured with the bfd all-neighbors command (interval,
min_rx, and multiplier).
If you explicitly enable (or disable) a peer group for BFD that has no BFD parameters configured (for example, advertisement
interval) using the neighbor peer-group-name bfd command, the peer group inherits any BFD settings configured with
the bfd all-neighbors command.
Displaying BFD for BGP Information
You can display related information for BFD for BGP.
To display information about BFD for BGP sessions on a router, use the following commands and refer to the following
examples.
● Verify a BFD for BGP configuration.
EXEC Privilege mode
show running-config bgp
● Verify that a BFD for BGP session has been successfully established with a BGP neighbor. A line-by-line listing of established
BFD adjacencies is displayed.
EXEC Privilege mode
show bfd neighbors [interface] [detail]
● Check to see if BFD is enabled for BGP connections.
EXEC Privilege mode
show ip bgp summary
● Displays routing information exchanged with BGP neighbors, including BFD for BGP sessions.
EXEC Privilege mode
show ip bgp neighbors [ip-address]
The following example shows viewing a BGP configuration.
R2# show running-config bgp
!
router bgp 2
neighbor 1.1.1.2 remote-as 1
neighbor 1.1.1.2 no shutdown
neighbor 2.2.2.2 remote-as 1
neighbor 2.2.2.2 no shutdown
neighbor 3.3.3.2 remote-as 1
neighbor 3.3.3.2 no shutdown
bfd all-neighbors
Bidirectional Forwarding Detection (BFD)
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