Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
spanning-tree mode
spanning-tree mode
To switch between PVST+ and MST modes, use the spanning-tree mode command. To return to the
default settings, use the no form of this command.
spanning-tree mode {pvst | mst | rapid-pvst}
no spanning-tree mode {pvst | mst | rapid-pvst}
Syntax Description
Defaults PVST+ mode
Command Modes Global configuration mode
Command History
Usage Guidelines
Caution Be careful when using the spanning-tree mode command to switch between PVST+ and MST modes.
When you enter the command, all spanning-tree instances are stopped for the previous mode and
restarted in the new mode. Using this command may cause disruption of user traffic.
Examples This example shows how to switch to MST mode:
Switch(config)# spanning-tree mode mst
Switch(config)#
This example shows how to return to the default mode (PVST):
Switch(config)# no spanning-tree mode
Switch(config)#
Related Commands
pvst Specifies PVST+ mode.
mst Specifies MST mode.
rapid-pvst Specifies Rapid PVST mode.
Release Modification
12.1(8a)EW Support for this command was introduced on the Catalyst 4500 series switch..
12.1(19)EW Support for the rapid-pvst keyword.
Command Description
show spanning-tree mst Displays MST protocol information.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E