Dell Force10 S4820T FTOS Command Reference Guide - Page 1195
Use Extend System ID to augment the Bridge ID with a VLAN ID so that PVST, PROTOCOL PVST
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Related Commands protocol spanning-tree pvst Enter SPANNING TREE mode on the switch. extend system-id c e s Use Extend System ID to augment the Bridge ID with a VLAN ID so that PVST+ differentiate between BPDUs for each VLAN. If for some reason on VLAN receives a BPDU meant for another VLAN, PVST+ will then not detect a loop, and both ports can remain in forwarding state. Syntax extend system-id Defaults Disabled Command Modes PROTOCOL PVST Command History version 8.3.19.0 Version 8.3.7.0 Version 8.3.1.0 Introduced on S4820T Introduced on S4810 Introduced Example Related Commands FTOS(conf-pvst)#do show spanning-tree pvst vlan 5 brief VLAN 5 Executing IEEE compatible Spanning Tree Protocol Root ID Priority 32773, Address 0001.e832.73f7 Root Bridge hello time 2, max age 20, forward delay 15 Bridge ID Priority 32773 (priority 32768 sys-id-ext 5), Address 0001.e832.73f7 We are the root of Vlan 5 Configured hello time 2, max age 20, forward delay 15 Interface Name PortID Prio Cost Gi 0/10 128.140 128 200000 Gi 0/12 128.142 128 200000 Designated Sts Cost Bridge ID PortID FWD 0 32773 0001.e832.73f7 128.140 DIS 0 32773 0001.e832.73f7 128.142 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge Gi 0/10 Desg 128.140 128 200000 FWD 0 P2P No Gi 0/12 Dis 128.142 128 200000 DIS 0 P2P No protocol spanning-tree pvst Enter SPANNING TREE mode on the switch. Per-VLAN Spanning Tree Plus (PVST+) | 1195