36-3
Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 36 Configuring Fallback Bridging
Configuring Fallback Bridging
Configuring Fallback Bridging
These sections describe how to configure fallback bridging on your switch:
• Default Fallback Bridging Configuration, page 36-3
• Fallback Bridging Configuration Guidelines, page 36-3
• Creating a Bridge Group, page 36-4
• Preventing the Forwarding of Dynamically Learned Stations, page 36-5
• Configuring the Bridge Table Aging Time, page 36-6
• Filtering Frames by a Specific MAC Address, page 36-6
• Adjusting Spanning-Tree Parameters, page 36-7
Default Fallback Bridging Configuration
Table 36-1 shows the default fallback bridging configuration.
Fallback Bridging Configuration Guidelines
A maximum of 31 bridge groups can be configured on the switch.
An interface (an SVI or routed port) can be a member of only one bridge group.
Use a bridge group for each separately bridged (topologically distinct) network connected to the switch.
Table 36-1 Default Fallback Bridging Configuration
Feature Default Setting
Bridge groups None are defined or assigned to an interface. No
VLAN-bridge STP is defined.
Switch forwards frames for stations that it has
dynamically learned
Enabled.
Bridge table aging time for dynamic entries 300 seconds.
MAC-layer frame filtering Disabled.
Spanning tree parameters:
• Switch priority
• Interface priority
• Interface path cost
• Hello BPDU interval
• Forward-delay interval
• Maximum idle interval
• 32768.
• 128.
• 10 Mbps: 100.
100 Mbps: 19.
1000 Mbps: 4.
• 2 seconds.
• 20 seconds.
• 30 seconds.
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