Cisco NM-8B-U - HW ROUTERS L-M User Manual page 124

Configuration Tasks
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:
Command
Step 1
configure terminal
Step 2 bridge bridge-group address mac-address
{forward | discard} [interface-id]
Step 3
end
Step 4
show running-config
Step 5 copy running-config startup-config
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:
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Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ
124
16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series
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
Purpose
Enters global configuration mode.
Specifies the MAC address to discard or forward.
For bridge-group, specify the bridge group number. The range is 1
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to 255.
For address mac-address, specify the MAC-layer destination
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address to be filtered.
Specify forward if you want the frame destined to the specified
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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.
Returns to privileged EXEC mode.
Verifies your entry.
(Optional) Saves your entry in the configuration file.