Sample PVST+ ConfigurationThe following examples show the PVST+ configuration that you must perform on each peer switch toprevent forwarding loops.Configure PVST+ on VLT Peers to Prevent Forwarding Loops (VLT Peer 1)Dell_VLTpeer1(conf)#protocol spanning-tree pvstDell_VLTpeer1(conf-pvst)#no disableDell_VLTpeer1(conf-pvst)#vlan 1000 bridge-priority 0Configure PVST+ on VLT Peers to Prevent Forwarding Loops (VLT Peer 2)Dell_VLTpeer2(conf)#protocol spanning-tree pvstDell_VLTpeer2(conf-pvst)#no disableDell_VLTpeer2(conf-pvst)#vlan 1000 bridge-priority 4096Configure both ends of the VLT interconnect trunk with identical PVST+ configurations. When youenable VLT, the show spanning-tree pvst brief command output displays VLT information.Dell#show spanning-tree pvst vlan 1000 briefVLAN 1000Executing IEEE compatible Spanning Tree ProtocolRoot ID Priority 0, Address 90b1.1cf4.9b79Root Bridge hello time 2, max age 20, forward delay 15Bridge ID Priority 0, Address 90b1.1cf4.9b79We are the root of Vlan 1000Configured hello time 2, max age 20, forward delay 15InterfaceDesignatedName PortID Prio Cost Sts Cost Bridge IDPortID---------- -------- ---- ------ ----------- ------- ----------------------------Po 1 128.2 128 188 FWD(vltI) 0 0 90b1.1cf4.9b79128.2Po 2 128.3 128 2000 FWD(vlt) 0 0 90b1.1cf4.9b79128.3Te 1/10/1 128.230 128 2000 FWD 0 090b1.1cf4.9b79 128.230Te 1/13/1 128.233 128 2000 FWD 0 090b1.1cf4.9b79 128.233InterfaceName Role PortID Prio Cost Sts Cost Link-type Edge---------- ------ -------- ---- ------- ----------- ------- --------- ----Po 1 Desg 128.2 128 188 FWD 0 (vltI)P2P NoPo 2 Desg 128.3 128 2000 FWD 0 (vlt) P2P NoTe 1/10/1 Desg 128.230 128 2000 FWD 0 P2P YesTe 1/10/3 Desg 128.233 128 2000 FWD 0 P2P NoDell#eVLT Configuration ExampleThe following example demonstrates the steps to configure enhanced VLT (eVLT) in a network.In this example, you are configuring two domains. Domain 1 consists of Peer 1 and Peer 2; Domain 2consists of Peer 3 and Peer 4, as shown in the following example.Virtual Link Trunking (VLT) 951
