HP 3020 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide, - Page 308
Configuring a Secondary Root Switch, Configuring Port Priority
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Configuring Spanning-Tree Features Chapter 13 Configuring STP Configuring a Secondary Root Switch When you configure a switch as the secondary root, the switch priority is modified from the default value (32768) to 28672. The switch is then likely to become the root switch for the specified VLAN if the primary root switch fails. This is assuming that the other network switches use the default switch priority of 32768 and therefore are unlikely to become the root switch. You can execute this command on more than one switch to configure multiple backup root switches. Use the same network diameter and hello-time values that you used when you configured the primary root switch with the spanning-tree vlan vlan-id root primary global configuration command. Beginning in privileged EXEC mode, follow these steps to configure a switch to become the secondary root for the specified VLAN. This procedure is optional. 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, you can specify a single VLAN identified by VLAN ID number, a range of VLANs separated by a hyphen, or a series of VLANs separated by a comma. The range is 1 to 4094. • (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; the default is 2. 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 13-14. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To return to the default setting, use the no spanning-tree vlan vlan-id root global configuration command. Configuring 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. 13-16 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide OL-8915-01
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