Concept Guide
Congure BFD in VLT Domain
Dell EMC Networking OS supports Bidirectional Forwarding Detection (BFD) to detect communication failures on an interface that is a part
of a VLT link aggregation group (LAG).
In VLT domain, BFD provides high availability path when there are communication failures in any one of the VLT LAG links. The VLT nodes
and top of rack (ToR) use the VLT LAG links to carry the BFD packets. When any one of the VLT LAG links connected to the ToR is down,
the BFD packets reach the VLT primary or secondary using the VLTi (ICL) link.
Sample BFD conguration in VLT domain
The following shows the sample conguration of BFD implementation in VLT environment:
ToR
1 Enable BFD globally.
TOR(conf)# bfd enable
2 Congure a VLT peer LAG.
TOR(conf)#interface gigabitethernet 1/1
TOR(conf-if-gi-1/1)#no ip address
TOR(conf-if-gi-1/1)#port-channel-protocol lacp
TOR(conf-if-gi-1/1)#port-channel 10 mode active
TOR(conf-if-gi-1/1)#no shutdown
TOR(conf)#interface gigabitethernet 1/2
TOR(conf-if-gi-1/2)#no ip address
TOR(conf-if-gi-1/2)#port-channel-protocol lacp
TOR(conf-if-gi-1/2)#port-channel 10 mode active
TOR(conf-if-gi-1/2)#no shutdown
3 Congure the port channel for the VLT interconnect on a ToR.
TOR(conf)# interface port-channel 10
TOR(conf-if-po-111)# no ip address
TOR(conf-if-po-111)# switchport
TOR(conf-if-po-111)# no shutdown
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Virtual Link Trunking (VLT)