Configuring VLT is easy. You need just to run the following commands.
Configure a Static LAG between the VLT swithes
configure
interface range fortyGigE 0/56 , fortyGigE 0/60
no shutdown
interface port-channel 128
channel-member fortyGigE 0/56, 60
no shutdown
Configure a VLT Domain on each VLT Peer
On first switch
configure
vlt domain 1
primary-priority 10
back-up destination 1.1.1.2
peer-link port-channel 128
On second switch
configure
vlt domain 1
primary-priority 20
back-up destination 1.1.1.1
peer-link port-channel 128
In a split brain condition setting system mac on vlti configuration can avoid portchannel to shutted down.
As advise use as system-mac the Local System Mac of one switch ’cause it is unique.
Configure an LACP LAG for the VLT LAG on each VLT peer
configure
interface range te 0/46 – 47
port-channel-protocol lacp
port-channel 1 mode active
switchport
vlt-peer-lag port-channel 1
For verifying the configuration use the following commands
show vlt brief
show vlt statistics
show vlt backup-link
show vlt detail