Cisco RJ-45-to-AUX - Verifying the Uplinkfast Configuration; Enabling Uplinkfast on a Cisco IOS Command−Based Switch; Disabling Uplinkfast on a Cisco IOS Command−Based Switch

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
——— ——————————————————
1 3/1(fwd)
2 3/2(fwd),3/1
2 3/3(fwd),3/1
5 3/4(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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