DETAILED STEPS
PurposeCommand or Action
Enables privileged EXEC mode. Enter your password if
prompted.
enable
Example:
Switch> enable
Step 1
Enters the global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 2
Disables UplinkFast and CSUF on the switch and all of
its VLANs.
no spanning-tree uplinkfast
Example:
Switch(config)# no spanning-tree uplinkfast
Step 3
Returns to privileged EXEC mode.end
Example:
Switch(config)# end
Step 4
When UplinkFast is disabled, the switch priorities of all VLANs and path costs of all interfaces are set to
default values if you did not modify them from their defaults.
When you disable the UplinkFast feature using these instructions, CSUF is automatically globally disabled
on nonstack port interfaces.
Enabling BackboneFast
You can enable BackboneFast to detect indirect link failures and to start the spanning-tree reconfiguration
sooner.
You can configure the BackboneFast feature for Rapid PVST+ or for the MSTP, but the feature remains
disabled (inactive) until you change the spanning-tree mode to PVST+.
This procedure is optional. Follow these steps to enable BackboneFast on the switch.
Before You Begin
If you use BackboneFast, you must enable it on all switches in the network. BackboneFast is not supported
on Token Ring VLANs. This feature is supported for use with third-party switches.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
309
How to Configure Optional Spanning-Tree Features
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