Cisco Systems 3750E manual Default Fallback Bridging Configuration, Creating a Bridge Group, 44-4

Chapter 44 Configuring Fallback Bridging

Configuring Fallback Bridging

Default Fallback Bridging Configuration

Table 44-1shows the default fallback bridging configuration.

Table 44-1 Default Fallback Bridging Configuration

Feature		Default Setting
Bridge groups		None are defined or assigned to a port. No
		VLAN-bridge STP is defined.
Switch forwards frames for stations that it has		Enabled.
dynamically learned
Spanning tree parameters:
•	Switch priority	•	32768.
•	Port priority	•	128.
•	Port path cost	•	10 Mb/s: 100.
			100 Mb/s: 19.
			1000 Mb/s: 4.
•	Hello BPDU interval	•	2 seconds.
•	Forward-delay interval	•	20 seconds.
•	Maximum idle interval	•	30 seconds.

Fallback Bridging Configuration Guidelines

Up to 32 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.

Do not configure fallback bridging on a switch configured with private VLANs.

All protocols except IP (Version 4 and Version 6), Address Resolution Protocol (ARP), reverse ARP (RARP), LOOPBACK, and Frame Relay ARP are fallback bridged.

Creating a Bridge Group

To configure fallback bridging for a set of SVIs or routed ports, these interfaces must be assigned to bridge groups. All interfaces in the same group belong to the same bridge domain. Each SVI or routed port can be assigned to only one bridge group.

Note The protected port feature is not compatible with fallback bridging. When fallback bridging is enabled, it is possible for packets to be forwarded from one protected port on a switch to another protected port on the same switch if the ports are in different VLANs.

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

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