Reference Guide

130 | Bidirectional Forwarding Detection (BFD)
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To re-enable BFD on an interface:
Configuring BFD for Static Routes
Configuring BFD for Static Routes is supported on C-Series and E-Series only.
BFD gives systems a link state detection mechanism for static routes. With BFD, systems are notified to
remove static routes from the routing table as soon as the link state change occurs, rather than having to
wait until packets fail to reach their next hop.
Configuring BFD for static routes is a three-step process:
1. Enable BFD globally. See Enabling BFD globally.
2. On the local system, establish a session with the next hop of a static route.
3. On the remote system, establish a session with the physical port that is the origin of the static route.
See Establishing a session on physical ports.
Related configuration tasks
• Change session parameters.
• Disable BFD for all static routes.
Establishing sessions for static routes
Sessions are established for all neighbors that are the next hop of a static route.
Figure 7-9. Enabling BFD for Static Routes
Step Task Command Syntax Command Mode
1 Enable BFD on an interface. bfd enable INTERFACE
2.2.2.1/24
4/24
2/1
2/2
6/0
FTOS(config)# interface gigabitethernet 2/2
FTOS(conf-if-gi-2/2)# ip address 2.2.3.1/24
FTOS(conf-if-gi-2/2)# no shutdown
FTOS(config)# interface gigabitethernet 4/24
FTOS(conf-if-gi-4/24)# ip address 2.2.2.1/24
FTOS(conf-if-gi-4/24)# no shutdown
FTOS(config)# ip route 2.2.3.0/24 2.2.2.2
FTOS(config)# ip route bfd
FTOS(config)# interface gigabitethernet 6/0
FTOS(conf-if-gi-6/0)# ip address 2.2.3.2/24
FTOS(conf-if-gi-6/0)# no shutdown
FTOS(config)# interface gigabitethernet 2/1
FTOS(conf-if-gi-2/1)# ip address 2.2.2.2/24
FTOS(conf-if-gi-2/1)# no shutdown
FTOS(conf-if-gi-2/1)# bfd neighbor 2.2.2.1
R1
2.2.3.2/24
2.2.3.1/242.2.2.2/24
R2
R3