Reference Guide

188 | Bidirectional Forwarding Detection
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Configuring BFD for Port-Channels
BFD on port-channels is analogous to BFD on physical ports. If no routing protocol is enabled, and a
remote system fails, the local system does not remove the connected route until the first failed attempt to
send a packet. If BFD is enabled, the local system removes the route when it stops receiving periodic
control packets from the remote system.
There is one BFD Agent for VLANs and port-channels, which resides on RP2 as opposed to the other
agents which are on the line card. Therefore, the 100 total possible sessions that this agent can maintain is
shared for VLANs and port-channels.
Configuring BFD for port-channels is a two-step process:
1. Enable BFD globally on all participating routers. Refer to Enabling BFD globally.
2. Enable BFD at interface level at both ends of the port-channel. Refer to Establishing sessions on
port-channels.
Related configuration tasks
• Changing port-channel session parameters.
• Disabling BFD for port-channels.
Establishing sessions on port-channels
To establish a session, BFD must be enabled at interface level on both ends of the link, as shown in
Figure 11-4. The session parameters do not need to match.
Figure 11-10. Establishing Sessions on Port-Channels\
To establish a session on a port-channel:
Step Task Command Syntax Command Mode
1 Establish a session on a port-channel. bfd neighbor ip-address INTERFACE PORT-CHANNEL
fnC0044mp
4/24
FTOS(config-if-range-gi-4/24-5)# port-channel-protocol lacp
FTOS(config-if-range-gi-4/24-5)# port-channel 1 mode active
FTOS(config-if-range-gi-4/24-5)# no shutdown
FTOS(config-if-range-gi-4/24-5)# interface port-channel 1
FTOS(config-if-po-1)# ip address 2.2.2.1/24
FTOS(config-if-po-1)# no shutdown
FTOS(config-if-po-1)# bfd neighbor 2.2.2.2
2/1
4/25 2/2
Port Channel 1
4/24
4/25
FTOS(config-if-range-gi-2/1-2)# port-channel-protocol lacp
FTOS(config-if-range-gi-2/1-2)# port-channel 1 mode active
FTOS(config-if-range-gi-2/1-2)# no shutdown
FTOS(config-if-range-gi-2/1-2)# interface port-channel 1
FTOS(config-if-po-1)# ip address 2.2.2.2/24
FTOS(config-if-po-1)# no shutdown
FTOS(config-if-po-1)# bfd neighbor 2.2.2.1