Cisco 2950 Software Configuration Guide - Page 334
Step 3, instances separated by a hyphen, or a series of instances
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Configuring MSTP Features Chapter 15 Configuring MSTP Step 3 Step 4 Step 5 Command end show spanning-tree mst instance-id copy running-config startup-config Purpose 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 mst instance-id root global configuration command. Configuring a Secondary Root Switch When you configure a Catalyst 2950 or Catalyst 2955 switch that supports the extended system ID as the secondary root, the spanning-tree switch priority is modified from the default value (32768) to 28672. The switch is then likely to become the root switch for the specified instance 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. For Catalyst 2950 switches without the extended system ID support (software earlier than Cisco IOS Release 12.1(9)EA1), the switch priority is changed to 16384. 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 mst instance-id root primary global configuration command. Beginning in privileged EXEC mode, follow these steps to configure a switch as the secondary root switch. This procedure is optional. Step 1 Step 2 Command configure terminal spanning-tree mst instance-id root secondary [diameter net-diameter [hello-time seconds]] Step 3 Step 4 Step 5 end show spanning-tree mst instance-id copy running-config startup-config Purpose Enter global configuration mode. Configure a switch as the secondary root switch. • For instance-id, you can specify a single instance, a range of instances separated by a hyphen, or a series of instances separated by a comma. The range is 0 to 15. • (Optional) For diameter net-diameter, specify the maximum number of switches between any two end stations. The range is 2 to 7. This keyword is available only for MST instance 0. • (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 15-14. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. 15-16 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10
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