Bridge Placement and Bridging Loops
There are two issues that you must consider when using bridges. The first is the bridge placement, and the other is the elimination of bridging loops:
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Placement Bridges should be positioned in the network using the 80/20 rule. This rule dictates that 80% of the data should be local and that the other 20% should be destined for devices on the other side of the bridge.
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Bridging loops Bridging loops can occur when more than one bridge is implemented on the network. In this scenario, the bridges can confuse each other by leading one another to believe that a device is located on a certain segment when it is not. To combat the bridging loop problem, the IEEE 802.1d Spanning Tree protocol enables bridge interfaces to be assigned a value that is then used to control the bridge-learning process.