• Use a device that is very stable— Because Spanning Tree is a protocol that constantly seeks out the most attractive Root Bridge, placing the Root Bridge on a device that reboots or fails frequently can disturb the entire network unnecessarily.
• Use a device that can carry the load— Because the Root Bridge functions as a central switching node for all of the branches of the Spanning Tree, it must be able to handle the potentially high aggregate load.
When implementing a Spanning Tree design, most organizations adopt one of two strategies:
• Distributed Root Bridges
• Centralized Root Bridges
Distributed Root Bridge placement is useful in situations where network designers want to spread the centralized switching load over more than one bridge. Besides increasing the overall available bandwidth, this technique can also improve network stability by not forcing the entire network to depend on one or two switches for Root Bridge services. However, distributing the Root Bridges can significantly increase troubleshooting complexity in your network by creating a different logical topology for every VLAN.
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