Install Guide

Table Of Contents
Sample PVST+ Configuration
The following examples show the PVST+ configuration that you must perform on each peer switch to prevent forwarding loops.
Configure PVST+ on VLT Peers to Prevent Forwarding Loops (VLT Peer 1)
Dell_VLTpeer1(conf)#protocol spanning-tree pvst
Dell_VLTpeer1(conf-pvst)#no disable
Dell_VLTpeer1(conf-pvst)#vlan 1000 bridge-priority 0
Configure PVST+ on VLT Peers to Prevent Forwarding Loops (VLT Peer 2)
Dell_VLTpeer2(conf)#protocol spanning-tree pvst
Dell_VLTpeer2(conf-pvst)#no disable
Dell_VLTpeer2(conf-pvst)#vlan 1000 bridge-priority 4096
Configure both ends of the VLT interconnect trunk with identical PVST+ configurations. When you enable VLT, the show
spanning-tree pvst brief command output displays VLT information.
Peer Routing Configuration Example
This section provides a detailed explanation of how to configure peer routing in a VLT domain.
In the following example, devices are configured as follows:
Access switch A1 is connected to two VLT peers (Dell-1 and Dell-2).
The two VLT peers are connected to an upstream switch R1.
OSPF is configured in Dell-1, Dell-2, and R1 switches.
Dell-1 is configured as the root bridge.
Dell-1 is configured as the VLT primary.
As the Router ID of Dell-1 is the highest in the topology (highest loopback address of 172.17.1.1), Dell-1 is the OSPF
Designated Router.
As the Router ID of Dell-2 is the second highest in the topology (172.16.1.1), Dell-2 is the OSPF Backup Designated Router.
Virtual Link Trunking (VLT)
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