Cisco 2950G 24 Software Configuration Guide - Page 332

Configuring Optional Spanning-Tree Features Chapter 13 Configuring Optional Spanning-Tree Features Enabling Cross-Stack UplinkFast Before enabling CSUF, make sure your stack switches are properly connected. For more information, see the "Connecting the Stack Ports" section on page 13-8. The CSUF feature is supported only when the switch is running PVST. Beginning in privileged EXEC mode, follow these steps to enable CSUF: Step 1 Step 2 Step 1 Step 2 Step 3 Step 4 Step 5 Command Purpose configure terminal Enter global configuration mode. spanning-tree uplinkfast [max-update-rate pkts-per-second] Enable UplinkFast on the switch. (Optional) For max-update-rate pkts-per-second, specify the number of packets per second at which update packets are sent. The range is 0 to 65535; the default is 150 packets per second. interface interface-id Enter interface configuration mode, and specify the GBIC interface on which to enable CSUF. spanning-tree stack-port Enable CSUF on only one stack-port GBIC interface. The stack port connects to the GigaStack GBIC multidrop backbone. If you try to enable CSUF on a Fast Ethernet or a Gigabit-capable Ethernet port, you receive an error message. If CSUF is already enabled on an interface and you try to enable it on another interface, you receive an error message. You must disable CSUF on the first interface before enabling it on a new interface. Use this command only on access switches. end Return to privileged EXEC mode. show running-config Verify your entries. copy running-config startup-config (Optional) Save your entries in the configuration file. To disable CSUF on an interface, use the no spanning-tree stack-port interface configuration command. To disable UplinkFast on the switch and all its VLANs, use the no spanning-tree uplinkfast global configuration command. 13-18 Catalyst 2950 Desktop Switch Software Configuration Guide 78-14982-01