STP Root port electoin


Since I didn’t include this part at the beginning at the very low level, decided just add it here.

1. Select the port connected to the path with the lowest accumulated Spanning Tree Path Cost to the Root Bridge (Root Switch) as the Root Port, when a Non-Root Switch has multiple paths to reach the Root Switch.
2. If multiple paths are available to reach the Root Bridge (Root Switch) with the same accumulated Spanning Tree Path Cost in a Non-Root Switch, select the port connected to the neighbor switch which has the lowest Switch ID value as the Root Port.
3. If all the multiple paths go through the same neighboring switch to reach the Root Bridge (Root Switch), Non-Root Switch will select the local port which receives the lowest port Spanning Tree Port Priority value from neighbor Switch as the Root Port.
4. If the received Spanning Tree Port Priority value values are the same between the connecting ports to reach the Root Bridge (Root Switch), Non-Root Switch will select the port which receives the lowest physical port number from neighbor Switch as the Root Port.

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