Cisco 2950G 24 Software Configuration Guide - Page 283
Configuring the Port Priority
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Chapter 11 Configuring STP Configuring Spanning-Tree Features Beginning in privileged EXEC mode, follow these steps to configure a switch to become the secondary root for the specified VLAN: Step 1 Step 2 Step 3 Step 4 Step 5 Command configure terminal spanning-tree vlan vlan-id root secondary [diameter net-diameter [hello-time seconds]] end show spanning-tree detail copy running-config startup-config Purpose Enter global configuration mode. Configure a switch to become the secondary root for the specified VLAN. • For vlan-id, the range is 1 to 4094 when the EI is installed and 1 to 1005 when the SI is installed. Do not enter leading zeros. • (Optional) For diameter net-diameter, specify the maximum number of switches between any two end stations. The range is 2 to 7. • (Optional) For hello-time seconds, specify the interval in seconds between the generation of configuration messages by the root switch. The range is 1 to 10 seconds; the default is 2 seconds. Use the same network diameter and hello-time values that you used when configuring the primary root switch. See the "Configuring the Root Switch" section on page 11-12. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To return the switch to its default setting, use the no spanning-tree vlan vlan-id root global configuration command. Configuring the Port Priority If a loop occurs, spanning tree uses the port priority when selecting an interface to put into the forwarding state. You can assign higher priority values (lower numerical values) to interfaces that you want selected first and lower priority values (higher numerical values) that you want selected last. If all interfaces have the same priority value, spanning tree puts the interface with the lowest interface number in the forwarding state and blocks the other interfaces. Cisco IOS uses the port priority value when the interface is configured as an access port and uses VLAN port priority values when the interface is configured as a trunk port. Beginning in privileged EXEC mode, follow these steps to configure the port priority of an interface: Step 1 Step 2 Command configure terminal interface interface-id 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). 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 11-15
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