Administrator Guide
Disabling BFD for VLANs
If you disable BFD on an interface, sessions on the interface are torn down.
A nal Admin Down control packet is sent to all neighbors and sessions on the remote system change to the Down state.
To disable BFD on a VLAN interface, use the following command.
• Disable all sessions on a VLAN interface.
INTERFACE VLAN mode
no bfd enable
Congure BFD for Port-Channels
BFD on port-channels is analogous to BFD on physical ports.
If you enable the no routing protocol, and a remote system fails, the local system does not remove the connected route until the rst
failed attempt to send a packet. If you enable BFD, 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 that resides on RP2, as opposed to the other agents that are on the line card.
Therefore, the 100 total possible sessions that this agent can maintain is shared for VLANs and port-channels.
Conguring BFD for port-channels is a two-step process:
• Enable BFD globally. Refer to Enabling BFD Globally.
• Establish sessions on port-channels. Refer to Establish Sessions on Port-Channels.
Related Conguration Tasks
• Changing Port-Channel Session Parameters.
• Disabling BFD for Port-Channels.
Establish Sessions on Port-Channels
To establish a session, you must enable BFD at interface level on both ends of the link, as shown in the following example. The
session parameters do not need to match.
Figure 16. Establishing Sessions on Port-Channels
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Bidirectional Forwarding Detection (BFD)