Cisco 2950G 24 Software Configuration Guide - Page 308
If a loop occurs, the MSTP uses the path cost when selecting an
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Configuring RSTP and MSTP Features Chapter 12 Configuring RSTP and MSTP Configuring the Path Cost The MSTP path cost default value is derived from the media speed of an interface. If a loop occurs, the MSTP uses cost when selecting an interface to put in the forwarding state. You can assign lower cost values to interfaces that you want selected first and higher cost values that you want selected last. If all interfaces have the same cost value, the MSTP puts the interface with the lowest interface number in the forwarding state and blocks the other interfaces. Beginning in privileged EXEC mode, follow these steps to configure the MSTP cost of an interface: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Command Purpose configure terminal Enter global configuration mode. interface interface-id Enter interface configuration mode, and specify an interface to configure. Valid interfaces include physical ports and port channels. Valid port-channel numbers are 1 to 6. spanning-tree mst instance-id cost cost Configure the cost for an MST instance. If a loop occurs, the MSTP uses the path cost when selecting an interface to place into the forwarding state. A lower path cost represents higher-speed transmission. • For instance-id, the range is 0 to 15. • For cost, the range is 1 to 200000000; the default value is derived from the media speed of the interface. end Return to privileged EXEC mode. show spanning-tree mst interface interface-id Verify your entries. or show spanning-tree mst instance-id copy running-config startup-config (Optional) Save your entries in the configuration file. Note The show spanning-tree mst interface interface-id privileged EXEC command displays information only for ports that are in a link-up operative state. Otherwise, you can use the show running-config privileged EXEC command to confirm the configuration. To return the interface to its default setting, use the no spanning-tree mst instance-id cost interface configuration command. 12-18 Catalyst 2950 Desktop Switch Software Configuration Guide 78-14982-01
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