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extend system-id
To augment the Bridge ID with a VLAN ID so that PVST+ differentiate between BPDUs for each VLAN, use
extend system ID. If the VLAN receives a BPDU meant for another VLAN, PVST+ does not detect a loop,
and both ports can remain in Forwarding state.
Z9500
Syntax
extend system-id
Defaults Disabled
Command
Modes
PROTOCOL PVST
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.3.1.0 Introduced.
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
1458
Per-VLAN Spanning Tree Plus (PVST+)