Configuring Advanced Stp Features; Configuring Port Fast - Cisco Catalyst 2950 Software Manual

Configuring Advanced STP Features

Configuring Advanced STP Features
These sections include advanced STP configuration information:
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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.
Use Port Fast only when connecting a single end station to an access port. Enabling this feature on an
Caution
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:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
spanning-tree portfast
Step 4
end
Step 5
show running interface interface-id
Step 6 copy running-config startup-config
To disable the Port Fast feature, use the no spanning-tree portfast interface configuration command.
Catalyst 2950 Desktop Switch Software Configuration Guide
9-30
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
Purpose
Enter global configuration mode.
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).
Enable Port Fast on an access port connected to a single
workstation or server.
By default, Port Fast is disabled on all interfaces.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 9 Configuring STP
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