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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.
S4820T
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
9.7(0.0) Introduced on the S6000-ON.
9.0.2.0 Introduced on the S6000.
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 1/10 Desg 128.140 128 200000 FWD 0 P2P No
Te 1/12 Dis 128.142 128 200000 DIS 0 P2P No
Per-VLAN Spanning Tree Plus (PVST+)
1443