Administrator Guide

Table Of Contents
shutdown
Dell#
Verify that the Port Channels used in the VLT Domain are Assigned to the VLAN-Stack VLAN
Configure 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 configuration in VLT domain
The following shows the sample configuration of BFD implementation in VLT environment:
ToR
1. Enable BFD globally.
TOR(conf)# bfd enable
2. Configure a VLT peer LAG.
3. Configure 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
4. Configure a VLAN.
TOR(conf)#interface vlan 100
TOR(conf-if-vl-100)#ip address 100.1.1.3/24
TOR(conf-if-vl-100)#tagged port-channel 10
TOR(conf-if-vl-100)#arp timeout 1
Virtual Link Trunking (VLT)
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