Reference Guide

178 | Bidirectional Forwarding Detection (BFD)
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To change session parameters on an interface:
View session parameters using the command
show bfd neighbors detail, as shown in Figure 8-10
Disabling BFD for VLANs
If BFD is disabled on an interface, sessions on the interface are torn down. A final Admin Down control
packet is sent to all neighbors, and sessions on the remote system change to the Down state (Message 3).
To disable BFD on a VLAN interface:
Configuring BFD for Port-Channels
Configuring BFD for port-channels is supported on the S5000 platform.
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. 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. Enabling BFD globally.
2. Establishing sessions on port-channels.
Related configuration tasks
• To establish a session on a port-channel:.
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 the
example below. The session parameters do not need to match.
Step Task Command Syntax Command Mode
1 Change session parameters for all
sessions on an interface.
bfd interval milliseconds min_rx milliseconds
multiplier value role
[active | passive]
INTERFACE VLAN
Step Task Command Syntax Command Mode
1 Disable all sessions on a VLAN interface. no bfd enable INTERFACE VLAN