The IEEE 802.1D Spanning Tree Protocol (STP) was designed to automatically generate a tree-shaped LAN topology that does not contain loops and to update the topology to use backup resources if some active component fails.
The tree will be the "best" one that can be constructed using the bridge parameters that have been established by LAN administrators.
The first step in the STP is to choose a bridge that will act as the root of the tree.
The tree that is formed will consist of paths that radiate out from the root and reach every bridge and every subLAN.
A bridge identifier is made up of a priority number and the unique bridge MAC address. The root of the tree is the bridge with the smallest bridge identifier.
The root should have ...