Concept Guide

• 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]
• Display BFD packet counters for sessions with BGP neighbors.
EXEC Privilege mode
show bfd counters bgp [interface]
• 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]
Example of Verifying BGP Conguration
Example of Viewing All BFD Neighbors
Example of Viewing BFD Neighbor Detail
Example of Viewing Congured BFD Counters
Example of Viewing BFD Summary Information
Example of Viewing BFD Information for a Specied Neighbor
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
R2# show bfd neighbors
* - Active session role
Ad Dn - Admin Down
B - BGP
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
M - MPLS
V - VRRP
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 1.1.1.3 1.1.1.2 Te 6/0 Up 200 200 3
B
* 2.2.2.3 2.2.2.2 Te 6/1 Up 200 200 3 B
* 3.3.3.3 3.3.3.2 Te 6/2 Up 200 200 3 B
The bold lines show the BFD session parameters: TX (packet transmission), RX (packet reception), and multiplier (maximum number of
missed packets).
R2# show bfd neighbors detail
Session Discriminator: 9
Neighbor Discriminator: 10
Local Addr: 1.1.1.3
Local MAC Addr: 00:01:e8:66:da:33
162
Bidirectional Forwarding Detection (BFD)