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Spanning Tree Optimization Root Bridge Placement

Posted by: admin  :  Category: CCNA, CCNP, Packet Tracer, Switching

With the ever expanding use of multilayer switches in today’s modern networks the ability to understand, configuring and optimize Spanning Tree has become very important part of setting up and maintaining today’s multilayer switched networks.

Originally Spanning Tree (STP) called Common Spanning Tree (CST) covered by the IEEE Standard 802.1Q was designed to operate in a bridged environment and was used to prevent loops and recover from topology changes in a redundant network design containing a single VLAN.


With new Multilayer Level 3 switches such as the Catalyst 3560 the need for additional functionality to support multiple VLANs lead to the expansion of the Protocol to support multiple VLANs and was called Per-VLAN Spanning Tree (PVST) and the Cisco proprietary protocol referred to as Per-VLAN Spanning Tree Plus (PVST+) The protocol supports all three CST, PVST and PVST+ within the same network.

The objective of this lab is to help you understand the importance of proper placement of the Root Bridge and how to configure a Primary and Secondary Root Bridge to insure proper operation of Spanning Tree Protocol with a multilayered switched network environment.

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