Administrator Guide

To establish a session on a port-channel, use the bfd neighbor ip-address command in INTERFACE PORT-CHANNEL mode.
View the established sessions using the show bfd neighbors command, as shown in Changing Port-Channel Session
Parameters.
Viewing Established Sessions for VLAN Neighbors
R2(conf-if-po-1)#bfd neighbors 2.2.2.1
R2(conf-if-po-1)#do show bfd neighors
* - Active session role
Ad Dn - Admin Down
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
V - VRRP
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 2.2.2.2 2.2.2.1
Po 1 Up 100 100 3 C
Changing Physical Port Session Parameters
Congure BFD sessions with default intervals and a default role.
The parameters that you can congure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.
Congure these parameters per interface; if you change a parameter, the change aects all physical port sessions on that interface.
CAUTION: When conguring BFD on VLAN or LAG interfaces, Dell Networking recommends a minimum value of 500
milliseconds for both the transmit and minimum receive time, which yields a nal detection time of (500ms *3) 1500
milliseconds.
Change session parameters for all sessions on an interface.
INTERFACE PORT-CHANNEL mode
bfd interval milliseconds min_rx milliseconds multiplier value role [active | passive]
View session parameters using the show bfd neighbors detail command.
Disabling BFD for Port-Channels
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 are placed in a Down state.
To disable BFD for a port-channel, use the following command.
• Disable BFD for a port-channel.
INTERFACE PORT-CHANNEL mode
no bfd enable
Conguring Protocol Liveness
Protocol liveness is a feature that noties the BFD manager when a client protocol is disabled.
When you disable a client, 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.
To enable protocol liveness, use the following command.
• Enable Protocol Liveness.
CONFIGURATION mode
bfd protocol-liveness
Bidirectional Forwarding Detection (BFD)
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