Reference Guide

172 | Bidirectional Forwarding Detection
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Enabling BFD globally
BFD must be enabled globally on both routers, as shown in Figure 11-4.
To enable BFD globally:
Verify that BFD is enabled globally using the command
show running bfd, as shown in the following
example.
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)#
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 11-4. The configuration parameters do not need to match.
Figure 11-4. Establishing a BFD Session for Physical Ports
To establish a session:
Step Task Command Syntax Command Mode
1 Enable BFD globally. bfd enable CONFIGURATION
Step Task Command Syntax Command Mode
1 Enter interface mode interface CONFIGURATION
2 Assign an IP address to the interface if one is not already
assigned.
ip address ip-address INTERFACE
R1: ACTIVE Role
R2: ACTIVE Role
FTOS(config)# bfd enable
FTOS(config)# interface gigabitethernet 4/24
FTOS(conf-if-gi-2/1)# ip address 2.2.2.1/24
FTOS(conf-if-gi-2/1)# bfd neighbor 2.2.2.2
fnC0038m
p
2/14/24
FTOS(config)# bfd enable
FTOSconfig)# interface gigabitethernet 2/1
FTOS(conf-if-gi-2/1)# ip address 2.2.2.2/24
FTOS(conf-if-gi-2/1)# bfd neighbor 2.2.2.1