Reference Guide

Defaults Disabled.
Command
Modes
CONFIGURATION (conf-pvst)
Command
History
Version 9.0(1.3) Introduced on the S5000.
Related
Commands
protocol spanning-tree pvst – enter PVST+ mode.
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 on VLAN receives a BPDU meant for another VLAN, PVST+ will
then not detect a loop, and both ports can remain in forwarding state.
S5000
Syntax
extend system-id
Defaults Disabled
Command
Modes
PROTOCOL PVST
Command
History
Version 9.0(1.3) Introduced on the S5000.
Example
Dell(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 Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
-------------------------------------------------------------
Te 0/10 128.140 128 200000 FWD 0 32773 0001.e832.73f7
128.140
Te 0/12 128.142 128 200000 DIS 0 32773 0001.e832.73f7
128.142
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
--------------------------------------------------------
Te 0/10 Desg 128.140 128 200000 FWD 0 P2P No
Te 0/12 Dis 128.142 128 200000 DIS 0 P2P No
1092
Per-VLAN Spanning Tree Plus (PVST+)