Adjusting Spanning-Tree Parameters - Cisco WS-C3550-12G Software Configuration Manual

Chapter 26 Configuring Fallback Bridging
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.
This example shows how to forward a frame with MAC address 0800.cb00.45e9 through an interface in
bridge group 1:
Switch(config)# bridge 1 address 0800.cb00.45e9 forward gigabitethernet0/1

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:
•
•
•
•
•
Only network administrators with a good understanding of how switches and STP function should
Note
make adjustments to spanning-tree parameters. Poorly planned adjustments can have a negative
impact on performance. A good source on switching is the IEEE 802.1d specification; for more
information, refer to the "References and Recommended Reading" appendix in the Cisco IOS
Configuration Fundamentals Command Reference.
78-11194-03
Changing the Switch Priority, page 26-8
Changing the Interface Priority, page 26-8
Assigning a Path Cost, page 26-9
Adjusting BPDU Intervals, page 26-10
Disabling the Spanning Tree on an Interface, page 26-12
Purpose
Enter global configuration mode.
Specify the MAC address to discard or forward.
• 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.
Return to privileged EXEC mode.
Verify your entry.
(Optional) Save your entry in the configuration file.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Fallback Bridging
26-7