Administrator Guide

Establish sessions with a VLAN neighbor.
INTERFACE VLAN mode
bfd neighbor ip-address
View the established sessions using the show bfd neighbors command, as shown in the following
example.
R2(conf-if-vl-200)#bfd neighbor 2.2.3.2
R2(conf-if-vl-200)#do show bfd neighbors
* - 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
* 2.2.3.2 2.2.3.1
Vl 200 Up 200 200 3 C
Changing VLAN Session Parameters
BFD sessions are configured with default intervals and a default role.
The parameters that you can configure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier,
and system role. You can change parameters per interface, if you make a configuration change, the change
affects all sessions on that interface.
CAUTION
: When configuring 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
final detection time of (500ms *3) 1500 milliseconds.
To change parameters for a session, use the following commands.
Change session parameters for all sessions on an interface.
INTERFACE VLAN mode
bfd interval milliseconds min_rx milliseconds multiplier value role [active |
passive]
To view session parameters, use the show bfd neighbors command, as shown in the example
Changing Physical Port Session Parameters.
Disabling BFD for VLANs
If you disable BFD 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.
To disable BFD on a VLAN interface, use the following command.
Disable all sessions on a VLAN interface.
INTERFACE VLAN mode
Bidirectional Forwarding Detection (BFD) 191