Cisco NM-8B-U User Guide - Page 126
Assigning a Path Cost, Adjusting BPDU Intervals, bridge-group, priority, path-cost
UPC - 074632001001
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Configuration Tasks 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Step 3 Command bridge-group bridge-group priority number Step 4 Step 5 Step 6 end show running-config copy running-config startup-config Purpose Changes the priority of an interface. • For bridge-group, specify the bridge group number. The range is 1 to 255. • For number, enter a number from 0 to 255. The lower the number, the more likely that the interface on the switch will be chosen as the root. The default is 128. Returns to privileged EXEC mode. Verifies your entry. (Optional) Saves your entry in the configuration file. To return to the default setting, use the bridge-group bridge-group priority number interface configuration command. Assigning a Path Cost Each interface has a path cost associated with it. By convention, the path cost is 1000/data rate of the attached LAN, in Mbps. Beginning in privileged EXEC mode, follow these steps to assign a path cost: Step 1 Step 2 Command configure terminal interface interface-id Step 3 bridge-group bridge-group path-cost cost Step 4 Step 5 Step 6 end show running-config copy running-config startup-config Purpose Enters global configuration mode. Enters interface configuration mode, and specify the interface to set the path cost. Assigns the path cost of an interface. • For bridge-group, specify the bridge group number. The range is 1 to 255. • For cost, enter a number from 1 to 65536. The higher the value, the higher the cost. - For 10 Mbps, the default path cost is 100. - For 100 Mbps, the default path cost is 19. - For 1000 Mbps, the default path cost is 4. Returns to privileged EXEC mode. Verifies your entry. (Optional) Saves your entry in the configuration file. To return to the default path cost, use the no bridge-group bridge-group path-cost cost interface configuration command. Adjusting BPDU Intervals You can adjust BPDU intervals as described in these sections: • Adjusting the Interval between Hello BPDUs, page 127 126 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ