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Dell EMC VxRail Multirack Deployment Guide
5.3
Configure Virtual Link Trunk (VLT)
To configure a Virtual Link Trunking (VLT) domain perform the following steps:
1. To configure the VLT interconnect (VLTi) member links enter the following commands:
sfo01-leaf03(config)#
interface range ethernet 1/1/49-1/1/52
sfo01-leaf03(conf-range-eth1/1/49-1/1/52)#
description VLTi
sfo01-leaf03(conf-range-eth1/1/49-1/1/52)#
no shutdown
sfo01-leaf03(conf-range-eth1/1/49-1/1/52)#
no switchport
sfo01-leaf03(conf-range-eth1/1/49-1/1/52)#
exit
2. Use the following commands to configure a VLT domain:
sfo01-leaf03(config)#
vlt-domain 1
sfo01-leaf03(conf-vlt-1)#
backup destination 100.67.166.34
sfo01-leaf03(conf-vlt-1)#
discovery-interface ethernet 1/1/49-1/1/52
sfo01-leaf03(conf-vlt-1)#
peer-routing
sfo01-leaf03(conf-vlt-1)#
exit
3. Enter the following commands to configure a dedicated L3 underlay path to reach the VLT peer if
there is a VLTi link failure:
sfo01-leaf03(config)#
interface vlan 4000
sfo01-leaf03(conf-if-vl-4000)#
description L3-VLT-peer
sfo01-leaf03(conf-if-vl-4000)#
no shutdown
sfo01-leaf03(conf-if-vl-4000)#
mtu 9216
sfo01-leaf03(conf-if-vl-4000)#
ip address 10.255.2.4/31
sfo01-leaf03(conf-if-vl-4000)#
ip ospf 1 area 0.0.0.0
sfo01-leaf03(conf-if-vl-4000)#
exit
Note:
This guide uses the 2x 200 GbE (QSFP-DD) ports to provide a 400 GbE VLTi link. As an alternative,
QSFP28 100 GbE cables can be used in the same interfaces provided a 200 GbE VLTi link.
5.4
Configure Uplink Failure Detection (UFD)
Configure Uplink Failure Detection (UFD) with uplinks upstream network interfaces and downstream for all
VxRail node interfaces. If all upstream connectivity to the spine layer is lost, the VxRail node interfaces are
shut down.
sfo01-leaf03(config)#
uplink-state-group 1
sfo01-leaf03(conf-uplink-state-group-1)#
enable
sfo01-leaf03(conf-uplink-state-group-1)#
downstream ethernet
1/1/1,1/1/3,1/1/5,1/1/7
sfo01-leaf03(conf-uplink-state-group-1)#
upstream ethernet1/1/53-1/1/54
sfo01-leaf03(conf-uplink-state-group-1)#
exit