White Papers

Per-VLAN Spanning Tree Plus (PVST+)
The Dell Networking Operating System (OS) implementation of per-VLAN spanning tree plus (PVST+) is based on the IEEE
802.1w standard spanning tree protocol, but it creates a separate spanning tree for each VLAN configured.
NOTE: For easier command line entry, the plus (+) sign is not used at the command line.
Topics:
• description
• disable
• edge-port bpdufilter default
• extend system-id
• protocol spanning-tree pvst
• show spanning-tree pvst
• spanning-tree pvst
• spanning-tree pvst err-disable
• tc-flush-standard
• vlan bridge-priority
• vlan forward-delay
• vlan hello-time
• vlan max-age
description
Enter a description of the PVST+.
Syntax
description {description}
To remove the description, use the no description {description} command.
Parameters
description Enter a description to identify the spanning tree (80 characters maximum).
Defaults none
Command Modes SPANNING TREE PVST+ (The prompt is “config-pvst”.)
Supported Modes Full—Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Related
Commands
protocol spanning-tree pvst — enter SPANNING TREE mode on the switch.
disable
Disable PVST+ globally.
Syntax
disable
To enable PVST+, use the no disable command.
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930 Per-VLAN Spanning Tree Plus (PVST+)