Cisco 2950 Software Configuration Guide - Page 358
Enabling UplinkFast for Use with Redundant Links
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Configuring Optional Spanning-Tree Features Chapter 16 Configuring Optional Spanning-Tree Features Beginning in privileged EXEC mode, follow these steps to globally enable the BPDU filtering feature. This procedure is optional. Step 1 Step 2 Command configure terminal spanning-tree portfast bpdufilter default Step 3 interface interface-id Step 4 Step 5 Step 6 Step 7 spanning-tree portfast end show running-config copy running-config startup-config 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. 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. Note When you enable UplinkFast, it affects all VLANs on the switch. You cannot configure UplinkFast on 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+. Beginning in privileged EXEC mode, follow these steps to enable UplinkFast. This procedure is optional. Step 1 Step 2 Step 3 Command Purpose configure terminal Enter global configuration mode. spanning-tree uplinkfast [max-update-rate Enable UplinkFast. pkts-per-second] (Optional) For pkts-per-second, the range is 0 to 32000 packets per second; the default is 150. If you set the rate to 0, station-learning frames are not generated, and the spanning-tree topology converges more slowly after a loss of connectivity. end Return to privileged EXEC mode. 16-16 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10
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