The bold line shows that BFD is enabled.
R1(conf)#bfd ?
enable Enable BFD protocol
protocol-liveness Enable BFD protocol-liveness
R1(conf)#bfd enable
R1(conf)#do show running-config bfd
!
bfd enable
R1(conf)#
Establishing a Session on Physical Ports
To establish a session, enable BFD at the interface level on both ends of the link, as shown in the
following illustration. The configuration parameters do not need to match.
Figure 10. Establishing a BFD Session on Physical Ports
1. Enter interface mode.
CONFIGURATION mode
interface
2. Assign an IP address to the interface if one is not already assigned.
INTERFACE mode
ip address ip-address
3. Identify the neighbor that the interface participates with the BFD session.
INTERFACE mode
bfd neighbor ip-address
Example of Verifying Session Creation
Example of the Viewing Detailed BFD Session Information
To verify that the session is established, use the show bfd neighbors command.
The bold line shows the BFD session.
R1(conf-if-gi-4/24)#do show bfd neighbors
* - Active session role
Ad Dn - Admin Down
Bidirectional Forwarding Detection (BFD) 149