Reference Guide

128 | Bidirectional Forwarding Detection (BFD)
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• Troubleshooting BFD
Configuring BFD for Physical Ports
Configuring BFD for Physical Ports is supported on C-Series and E-Series only.
BFD on physical ports is useful when no routing protocol is enabled. Without BFD, if the remote system
fails, the local system does not remove the connected route until the first failed attempt to send a packet.
When BFD is enabled, the local system removes the route as soon as it stops receiving periodic control
packets from the remote system.
Configuring BFD for a physical port is a two-step process:
1. Enable BFD globally.
2. Establish a session with a next-hop neighbor.
Related configuration tasks
• Change session parameters.
• Disable or re-enable BFD on an interface.
Enabling BFD globally
BFD must be enabled globally on both routers, as shown in the following illustration
To enable BFD globally:
Verify that BFD is enabled globally using the command
show running bfd, as shown in the following
figure.
Figure 7-4. Enabling BFD Globally
Step Task Command Syntax Command Mode
1 Enable BFD globally. bfd enable CONFIGURATION
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)#
BFD Enabled