Users Guide

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 conguration
parameters do not need to match.
Figure 12. 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
Examples of the show bfd neighbors command.
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
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 2.2.2.1 2.2.2.2
Gi 4/24 Up 100 100 3 C
To view specic information about BFD sessions, use the show bfd neighbors detail command.
R1(conf-if-gi-4/24)#do show bfd neighbors detail
Session Discriminator: 1
Neighbor Discriminator: 1
Local Addr: 2.2.2.1
Local MAC Addr: 00:01:e8:09:c3:e5
Remote Addr: 2.2.2.2
Remote MAC Addr: 00:01:e8:06:95:a2
Int: GigabitEthernet 4/24
State: Up
Bidirectional Forwarding Detection (BFD)
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