Command Line Reference Guide

1102 | Per-VLAN Spanning Tree plus (PVST+)
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disable
c e s
Disable PVST+ globally.
Syntax
disable
To enable PVST+, enter no disable.
Defaults
PVST+ is disabled
Command Modes
CONFIGURATION (conf-pvst)
Command
History
Related
Commands
description
c e s
Enter a description of the PVST+
Syntax
description {description}
To remove the description, use the no description {description} command.
Parameters
Defaults
No default behavior or values
Command Modes
SPANNING TREE PVST+ (The prompt is “config-pvst”.)
Command
History
Related
Commands
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
Version 7.6.1.0 Support added for S-Series
Version 7.5.1.0 Support added for C-Series
pre-Version 6.2.1.1 Introduced on E-Series
protocol spanning-tree pvst Enter PVST+ mode.
description
Enter a description to identify the Spanning Tree (80 characters maximum).
pre-7.7.1.0 Introduced
protocol spanning-tree pvst Enter SPANNING TREE mode on the switch.