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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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Using Integrated Routing and Bridging (IRB) to Extend a VLAN

The following steps describe the process for creating a broadcast domain within the Layer 3 device and then mapping that to the VLAN through a trunk link:

1.
Create a bride group.
IOS
(global) bridge
											number
											protocol ieee
										
In global configuration mode, the bridge command creates a bridge group. The number option specifies the group; numbers can range from 1 to 255. If your VLAN on the switch is within this range, it is recommended to create a bridge group with the same number as the VLAN. The protocol option should always be ieee when working with switches because the switch does not understand the Digital Equipment Corporation Spanning-Tree Protocol (STP), and bridge loops may occur. ...

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