Reference Guide

no ip address
switchport
no shutdown
Dell-1#show interfaces port-channel 100 brief
Codes: L - LACP Port-channel
LAG Mode Status Uptime Ports
L 100 L2 up 03:33:48 Te 0/48 (Up)
Te 0/50 (Up)
Verify VLT is up. Verify that the VLTi (ICL) link, backup link connectivity (heartbeat status), and VLT peer link (peer chassis) are
all up.
Dell-2#show vlt brief
VLT Domain Brief
------------------
Domain ID: 5
Role: Primary
Role Priority: 32768
ICL Link Status: Up
HeartBeat Status: Up
VLT Peer Status: Up
Local System MAC address: 00:01:e8:8c:4d:08
Remote System MAC address: 00:01:e8:8c:4d:1c
Dell-2#show vlt detail
Local LAG Id Peer LAG Id Local Status Active VLANs
------------ ----------- ------------ ------------
2 2 Up 1000-1199
Verify that the VLT LAG is up in both VLT peer units.
Dell-2#show interfaces port-channel 2 brief
Codes: L - LACP Port-channel
LAG Mode Status Uptime Ports
L 2 L2L3 up 03:43:24 Te 0/40 (Up)
Dell-4#show interfaces port-channel 2 brief
Codes: L - LACP Port-channel
LAG Mode Status Uptime Ports
L 2 L2L3 up 03:33:31 Te 0/18 (Up)
PVST+ Configuration
PVST+ is supported in a VLT domain.
Before you configure VLT on peer switches, configure PVST+ in the network. PVST+ is required for initial loop prevention during
the VLT startup phase. You may also use PVST+ for loop prevention in the network outside of the VLT port channel.
Run PVST+ on both VLT peer switches. PVST+ instance will be created for every VLAN configured in the system. PVST+
instances running in the Primary Peer will control the VLT-LAGs on both Primary and Secondary peers. Only the Primary VLT
switch determines the PVST+ roles and states on VLT ports and ensures that the VLT interconnect link is never blocked. PVST+
instance in Primary peer will send the role/state of VLT-LAGs for all VLANs to the Secondary peer. Secondary peer will use this
information to program the hardware. PVST+ instance running in Secondary peer will not control the VLT-LAGs.
Dell Networking recommends configuring the primary VLT peer as the primary root device for all the configured PVST+
Instances and configuring the secondary VLT peer as the secondary root device for all the configured PVST+ Instances.
Sample PVST+ Configuration
The following examples show the PVST+ configuration that you must perform on each peer switch to prevent forwarding loops.
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Virtual Link Trunking (VLT)