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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
spanning-tree stack-port
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.
spanning-tree stack-port
no spanning-tree stack-port
Syntax Description This command has no arguments or keywords.
Defaults 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.
Examples 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.
Release Modification
12.1(6)EA2 This command was introduced.
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