Administrator Guide

Configure BFD for VLANs
BFD on Dell Networking systems is a Layer 3 protocol.
Use BFD with routed virtual local area networks (VLANs). BFD on VLANs 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 first 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.
Configuring BFD for VLANs is a two-step process:
1 Enable the BFD globally. Refer to Enabling BFD Globally.
2 Establish sessions with VLAN neighbors. Refer to Establish Sessions with VLAN Neighbors.
Related Configuration Task
• Changing VLAN Session Parameters.
• Disabling BFD for VLANs.
Establish Sessions with VLAN Neighbors
To establish a session, enable BFD at interface level on both ends of the link, as shown in the following
illustration. The session parameters do not need to match.
Figure 16. Establishing Sessions with VLAN Neighbors
To establish a BFD session with a VLAN neighbor, follow this step.
Bidirectional Forwarding Detection (BFD) 190