Concept Guide
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 15. Establishing Sessions with VLAN Neighbors
To establish a BFD session with a VLAN neighbor, follow this step.
• 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 congured with default intervals and a default role.
The parameters that you can congure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role. You can
change parameters per interface, if you make a conguration change, the change aects all sessions on that interface.
CAUTION
: When conguring 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.
To change parameters for a session, use the following commands.
• Change session parameters for all sessions on an interface.
Bidirectional Forwarding Detection (BFD)
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