Cisco Catalyst 3750 Metro Command Reference Manual page 709

Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
If you set the max-update-rate to 0, station-learning frames are not generated, so the spanning-tree
topology converges more slowly after a loss of connectivity.
Examples
This example shows how to enable UplinkFast:
Switch(config)# spanning-tree uplinkfast
You can verify your setting by entering the show spanning-tree summary privileged EXEC command.
Related Commands Command
show spanning-tree
spanning-tree vlan
OL-9645-10
Description
summary Displays a summary of the spanning-tree interface states.
root primary Forces this switch to be the root switch.
Catalyst 3750 Metro Switch Command Reference
spanning-tree uplinkfast
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