Enabling Uplinkfast For Use With Redundant Links - Cisco Catalyst 2950 Software Configuration Manual

Chapter 15 Configuring Optional Spanning-Tree Features
Beginning in privileged EXEC mode, follow these steps to globally enable the BPDU filtering feature.
This procedure is optional.
Command
Step 1 configure terminal
Step 2 spanning-tree portfast bpdufilter default
Step 3
interface interface-id
Step 4 spanning-tree portfast
Step 5 end
Step 6
show running-config
Step 7
copy running-config startup-config
To disable BPDU filtering, use the no spanning-tree portfast bpdufilter default global configuration
command.
You can override the setting of the no spanning-tree portfast bpdufilter default global configuration
command by using the spanning-tree bpdufilter enable interface configuration command.

Enabling UplinkFast for Use with Redundant Links

UplinkFast cannot be enabled on VLANs that have been configured for switch priority. To enable
UplinkFast on a VLAN with switch priority configured, first restore the switch priority on the VLAN to
the default value by using the no spanning-tree vlan vlan-id priority global configuration command.
When you enable UplinkFast, it affects all VLANs on the switch. You cannot configure UplinkFast on
Note
an individual VLAN.
You can enable the UplinkFast feature for rapid PVST+ or for the MSTP, but the feature remains disabled
(inactive) until you change the spanning-tree mode to PVST+.
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Purpose
Enter global configuration mode.
Globally enable BPDU filtering.
By default, BPDU filtering is disabled.
Specify the interface connected to an end station, and enter
interface configuration mode.
Enable the Port Fast feature.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Configuring Optional Spanning-Tree Features
15-17