HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 350
Optional Spanning-Tree Configuration Guidelines, Enabling Port Fast
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Configuring Optional Spanning-Tree Features Chapter 15 Configuring Optional Spanning-Tree Features Optional Spanning-Tree Configuration Guidelines You can configure PortFast, BPDU guard, BPDU filtering, EtherChannel guard, root guard, or loop guard if your switch is running PVST+, rapid PVST+, or MSTP. You can configure the UplinkFast or the BackboneFast feature for rapid PVST+ or for the MSTP, but the feature remains disabled (inactive) until you change the spanning-tree mode to PVST+. Enabling Port Fast An interface 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 or trunk port. Enabling this feature on an interface connected to a switch or hub could prevent spanning tree from detecting and disabling loops in your network, which could cause broadcast storms and address-learning problems. If you enable the voice VLAN feature, the Port Fast feature is automatically enabled. When you disable voice VLAN, the Port Fast feature is not automatically disabled. For more information, see Chapter 12, "Configuring Voice VLAN." You can enable this feature if your switch is running PVST+, rapid PVST+, or MSTP. Beginning in privileged EXEC mode, follow these steps to enable Port Fast. This procedure is optional. Step 1 Step 2 Command configure terminal interface interface-id Step 3 spanning-tree portfast [trunk] Purpose Enter global configuration mode. Specify an interface to configure, and enter interface configuration mode. Enable Port Fast on an access port connected to a single workstation or server. By specifying the trunk keyword, you can enable Port Fast on a trunk port. Note To enable Port Fast on trunk ports, you must use the spanning-tree portfast trunk interface configuration command. The spanning-tree portfast command will not work on trunk ports. Step 4 Step 5 Step 6 end show spanning-tree interface interface-id portfast copy running-config startup-config Caution Make sure that there are no loops in the network between the trunk port and the workstation or server before you enable Port Fast on a trunk port. 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. 15-10 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide OL-8915-01
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