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A-7

Catalyst 4224 Access Gateway Switch Software Configuration Guide

OL-2031-02

Appendix A Command Reference for Voice VLAN

spanning-tree portfast

You can disable STP on a VLAN that is not currently active, and verify the change

by using the privileged EXEC show running-config or the show spanning-tree

vlan stp-list command. The setting takes effect when the VLAN is activated.

If the variable stp-list is omitted, the command applies to the STP instance

associated with VLAN 1.

You can enable STP on a VLAN that has no ports assigned to it.

Example

The following example shows how to disable STP on VLAN 5:

Switch(config)# no spanning-tree vlan 5

You can verify the previous command by entering the show spanning-tree

command in privileged EXEC mode. In this instance, VLAN 5 does not appear in

the list.

spanning-tree portfast

Use the spanning-tree portfast interface configuration command to enable the

Port Fast feature on a port in all its associated VLANs. When the Port Fast feature

is enabled, the port changes directly from a blocking state to a forwarding state

without making the intermediate STP status changes. Use the no form of this

command to return the port to default operation.

Syntax

spanning-tree portfast

no spanning-tree portfast

Syntax Description

This command has no keywords or arguments.

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