Reference Guide

180 | Bidirectional Forwarding Detection (BFD)
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Changing port-channel session parameters
BFD sessions are configured with default intervals and a default role. The parameters that can be
configured are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.
These parameters are configured per interface; if you change a parameter, the change affects all sessions on
that interface.
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 port-channels
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 are placed in a Down state (Message 3).
To disable BFD for a port-channel:
Configuring Protocol Liveness
Protocol Liveness is a feature that notifies the BFD Manager when a client protocol is disabled. When a
client is disabled, all BFD sessions for that protocol are torn down. Neighbors on the remote system
receive an Admin Down control packet and are placed in the Down state (Message 3).
To enable Protocol Liveness:
Caution: When configuring BFD on VLAN or LAG interfaces on the C-Series, Dell Networking
recommends a minimum value of 500 milliseconds for both the transmit and minimum receive time, which
yields a final detection time of (500ms *3) 1500 milliseconds.
Step Task Command Syntax Command Mode
1 Change session parameters for all
sessions on a port-channel interface.
bfd interval milliseconds min_rx milliseconds
multiplier value role
[active | passive]
INTERFACE
PORT-CHANNEL
Step Task Command Syntax Command Mode
1 Disable BFD for a port-channel. no bfd enable INTERFACE PORT-CHANNEL
Step Task Command Syntax Command Mode
1 Enable Protocol Liveness bfd protocol-liveness CONFIGURATION