Reference Guide

154 | Bidirectional Forwarding Detection (BFD)
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Configuring BFD for Physical Ports
Configuring BFD for Physical Ports is supported on the S5000 platform.
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. Enabling BFD globally.
2. Establishing a session on physical ports
Related configuration tasks
• Viewing Established Sessions for Physical Ports.
• Disabling and re-enabling BFD.
Enabling BFD globally
BFD must be enabled globally on both routers, as shown in the illustration in Establishing a session on
physical ports.
To enable BFD globally:
Verify that BFD is enabled globally using the command
show running bfd, as shown in the example below.
Figure 8-4. 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 the
illustration below. The configuration parameters do not need to match.
Step Task Command Syntax Command Mode
1 Enable BFD globally. bfd enable CONFIGURATION
FTOS(conf)#bfd ?
enable Enable BFD protocol
protocol-liveness Enable BFD protocol-liveness
FTOS(conf)#bfd enable
FTOS(conf)#do show running-config bfd
!
bfd enable
FTOS(conf)#
BFD Enabled Globally