Cisco NM-8B-U User Guide - Page 124
Filtering Frames by a Specific MAC Address, Adjusting Spanning-Tree Parameters, bridge, aging-time
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 To return to the default aging-time interval, use the no bridge bridge-group aging-time global configuration command. Filtering Frames by a Specific MAC Address A switch examines frames and sends them through the internetwork according to the destination address; a switch does not forward a frame back to its originating network segment. You can use the software to configure specific administrative filters that filter frames based on information other than the paths to their destinations. You can filter frames with a particular MAC-layer station destination address. Any number of addresses can be configured in the system without a performance penalty. Beginning in privileged EXEC mode, follow these steps to filter by the MAC-layer address: Step 1 Step 2 Step 3 Step 4 Step 5 Command Purpose configure terminal Enters global configuration mode. bridge bridge-group address mac-address Specifies the MAC address to discard or forward. {forward | discard} [interface-id] • For bridge-group, specify the bridge group number. The range is 1 to 255. • For address mac-address, specify the MAC-layer destination address to be filtered. • Specify forward if you want the frame destined to the specified interface to be forwarded. Specify discard if you want the frame to be discarded. • (Optional) For interface-id, specify the interface on which the address can be reached. end Returns to privileged EXEC mode. show running-config Verifies your entry. copy running-config startup-config (Optional) Saves your entry in the configuration file. To disable the frame forwarding ability, use the no bridge bridge-group address mac-address global configuration command. Adjusting Spanning-Tree Parameters You might need to adjust certain spanning-tree parameters if the default values are not suitable for your switch configuration. Parameters affecting the entire spanning tree are configured with variations of the bridge global configuration command. Interface-specific parameters are configured with variations of the bridge-group interface configuration command. You can adjust spanning-tree parameters by performing any of the tasks in these sections: • Changing the Switch Priority, page 125 • Changing the Interface Priority, page 125 • Assigning a Path Cost, page 126 • Adjusting BPDU Intervals, page 126 • Disabling the Spanning Tree on an Interface, page 128 124 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ