Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module FTOS Command Line Referen - Page 451
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extend system-id 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 a 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 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module Example Figure 24-1. Command Example FTOS(conf-pvst)#do show spanning-tree pvst vlan 2 brief VLAN 2 Executing IEEE compatible Spanning Tree Protocol Root ID Priority 32768, Address 001e.c9f1.00f3 Root Bridge hello time 2, max age 20, forward delay 15 Bridge ID Priority 32768, Address 001e.c9f1.00f3 We are the root of Vlan 2 Configured hello time 2, max age 20, forward delay 15 Bpdu filter disabled globally Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID Po 23 128.24 128 1600 FWD 0 32768 001e.c9f1.00f3 128.24 Te 5/41 128.450 128 2000 DIS 0 32768 001e.c9f1.00f3 128.450 Te 5/50 128.459 128 2000 FWD 0 32768 001e.c9f1.00f3 128.459 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge BpduFilter Po 23 Desg 128.24 128 1600 FWD 0 P2P No No Te 5/41 Dis 128.450 128 2000 DIS 0 P2P No No Te 5/50 Desg 128.459 128 2000 FWD 0 P2P No No Related Commands protocol spanning-tree pvst Enter SPANNING TREE mode on the switch. Per-VLAN Spanning Tree Plus (PVST+) | 451