9-30
Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 9 Configuring STP
Configuring Advanced STP Features
Configuring Advanced STP Features
These sections include advanced STP configuration information:
• Configuring Port Fast, page 9-30
• Configuring BPDU Guard, page 9-31
• Configuring UplinkFast for Use with Redundant Links, page 9-32
• Configuring Cross-Stack UplinkFast, page 9-33
• Configuring BackboneFast, page 9-34
• Configuring Root Guard, page 9-34
Configuring Port Fast
A port with the Port Fast feature enabled is moved directly to the spanning-tree forwarding state without
waiting for the standard forward-time delay.
Caution Use Port Fast only when connecting a single end station to an access port. Enabling this feature on an
interface connected to a switch or hub could prevent STP from detecting and disabling loops in your
network, which could cause broadcast storms and address-learning problems.
Beginning in privileged EXEC mode, follow these steps to enable Port Fast on an access port:
To disable the Port Fast feature, use the no spanning-tree portfast interface configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify an interface to
configure. Valid interfaces include physical interfaces and
port-channel logical interfaces (port-channel
port-channel-number).
Step 3
spanning-tree portfast Enable Port Fast on an access port connected to a single
workstation or server.
By default, Port Fast is disabled on all interfaces.
Step 4
end Return to privileged EXEC mode.
Step 5
show running interface interface-id Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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