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176 | Bidirectional Forwarding Detection
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Configuring BFD for Physical Ports
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. See page 176.
2. Establish a session with a next-hop neighbor. See page 176.
Related configuration tasks
• Change session parameters. See page 178.
• Disable or re-enable BFD on an interface. See page 179.
Enabling BFD globally
BFD must be enabled globally on both routers, as shown in Figure 9-5.
To enable BFD globally:
Verify that BFD is enabled globally using the command
show running bfd, as shown in Figure 9-4.
Figure 9-4. Enabling BFD Globally
Establishing a session on physical ports
To establish a session, BFD must be enabled at interface level on both ends of the link, as shown in
Figure 9-5. The configuration parameters do not need to match.
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 Globally