Users Guide

• Congure BFD for Port-Channels
• Congure BFD for Static Routes
• Congure BFD for OSPF
• Congure BFD for OSPFv3
• Congure BFD for BGP
• Congure BFD for VRRP
• Congure BFD for VLANs
• Conguring Protocol Liveness
Congure BFD for Physical Ports
BFD on physical ports is useful when you do not enable the routing protocol.
Without BFD, if the remote system fails, the local system does not remove the connected route until the rst failed attempt to send a
packet. When you enable BFD, the local system removes the route as soon as it stops receiving periodic control packets from the remote
system.
Conguring BFD for a physical port is a two-step process:
1 Enable BFD globally. Refer to Enabling BFD Globally.
2 Establish a session with a next-hop neighbor.
Related Conguration Tasks
• Changing Physical Port Session Parameters.
• Disabling and Re-Enabling BFD.
Enabling BFD Globally
You must enable BFD globally on both routers.
To enable the BFD globally, use the following command.
• Enable BFD globally.
CONFIGURATION mode
bfd enable
Example of Verifying BFD is Enabled
To verify that BFD is enabled globally, use the show running bfd command.
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)#
Bidirectional Forwarding Detection (BFD)
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