Spanning-Tree Stack-Port - Cisco Catalyst 3550 Command Reference Manual

Multilayer switch

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Chapter 2 Catalyst 3550 Switch Cisco IOS Commands

spanning-tree stack-port

Use the spanning-tree stack-port interface configuration command to enable cross-stack UplinkFast

(CSUF) on an interface and to accelerate the choice of a new root port when a link or switch fails or

when spanning tree reconfigures itself. Use the no form of this command to return to the default setting.

Syntax Description

This command has no arguments or keywords.

CSUF is disabled on all interfaces.

Command Modes

Interface configuration

Command History

Usage Guidelines

This command is effective only if you enable the UplinkFast feature by using the spanning-tree

uplinkfast global configuration command.

Use this command only on access switches.

The CSUF feature is supported only when the switch is running per-VLAN spanning-tree plus (PVST+).

It is not supported when the switch is running rapid PVST+ or multiple spanning tree (MST).

You can enable CSUF only on one stack-port Gigabit Interface Converter (GBIC) interface. The stack

port connects to the GigaStack GBIC multidrop backbone. If you try to enable CSUF on a Fast Ethernet

or a copper-based Gigabit Ethernet port, you receive an error message.

If CSUF is already enabled on an interface and you try to enable it on another interface, you receive an

error message. You must disable CSUF on the first interface before enabling it on a new interface.

This example shows how to enable CSUF on the GBIC interface:

Switch(config)# interface gigabitethernet0/1

Switch(config-if)# spanning-tree stack-port

You can verify your settings by entering the show running-config privileged EXEC command.

spanning-tree stack-port

no spanning-tree stack-port

Modification

This command was introduced.

Catalyst 3550 Multilayer Switch Command Reference

spanning-tree stack-port

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