You must clear the port and bridge costs modified by UplinkFast using the clear spantree uplinkfast command shown below:

catalyst5000> (enable) clear spantree uplinkfast

This command will cause all portcosts, portvlancosts, and the bridge priority on all vlans to be set to default.

Do you want to continue (y/n) [n]? y VLANs 1−1005 bridge priority set to 32768.

The port cost of all bridge ports set to default value. The portvlancost of all bridge ports set to default value. uplinkfast all−protocols field set to off.

uplinkfast disabled for bridge.

Verifying the UplinkFast Configuration

To verify the UplinkFast configuration on a Set/Clear command−based switch, you can use the following Privileged mode command:

show spantree uplinkfast

You should get output similar to the following—notice that the VLANs followed by a comma, module number, and port number are forwarding to 3/1:

station

update rate set to 15

packets/100ms.

uplinkfast all−protocol field

set to off.

VLAN

port list

 

—————————————————————

13/1(fwd)

23/2(fwd),3/1

23/3(fwd),3/1

53/4(fwd),3/1

Enabling UplinkFast on a Cisco IOS Command−Based Switch

To enable UplinkFast on a Cisco IOS command−based switch, use this command in Global Configuration mode:

uplink−fast

Disabling UplinkFast on a Cisco IOS Command−Based Switch

To disable UplinkFast on a Cisco IOS command−based switch, use this command in Global Configuration mode:

no uplink−fast

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Cisco Systems RJ-45-to-AUX Verifying the UplinkFast Configuration, Enabling UplinkFast on a Cisco IOS Command−Based Switch