Reference Guide

Bidirectional Forwarding Detection | 199
Configuring BFD for VLANs is a two-step process:
1. Enable BFD globally on all participating routers. See Enabling BFD globally.
2. Establish sessions with VLAN neighbors. See page 199.
Related configuration tasks
• Change session parameters. See page 200.
• Disable BFD for VLANs. See page 182.
Establishing sessions with VLAN neighbors
To establish a session, BFD must be enabled at interface level on both ends of the link, as shown in
Figure 9-25. The session parameters do not need to match.
Figure 9-25. Establish Sessions with VLAN Neighbors
To establish a BFD session with a VLAN neighbor:
View the established sessions using the command
show bfd neighbors, as shown in Figure 9-26.
Step Task Command Syntax Command Mode
1 Establish sessions with a VLAN neighbor.
bfd neighbor ip-address
INTERFACE VLAN
fnC0043mp
Force10(config-if-gi-4/25)# switchport
Force10(config-if-gi-4/25)# no shutdown
Force10(config-if-gi-4/25)# interface vlan 200
Force10(config-if-vl-200)# ip address 2.2.3.1/24
Force10(config-if-vl-200)# untagged gigabitethernet 4/25
Force10(config-if-vl-200)# no shutdown
Force10(config-if-vl-200)# bfd neighbor 2.2.3.2
4/25 2/3
VLAN 200
Force10(config-if-gi-2/3)# switchport
Force10(config-if-gi-2/3)# no shutdown
Force10(config-if-gi-2/3)# interface vlan 200
Force10(config-if-vl-200)# ip address 2.2.3.2/24
Force10(config-if-vl-200)# untagged gigabitethernet 2/3
Force10(config-if-vl-200)# no shutdown
Force10(config-if-vl-200)# bfd neighbor 2.2.3.2
R1
R2