why does Spanning Tree Protocol assign root bridge to lowest MAC

Discussion in 'Computing and Networks' started by u-will-neva-no, Oct 28, 2012.

  1. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
    Hey everyone, I was learning about the spanning tree protocol and was wondering why the root bridge is assigned to the lowest MAC. Would it make any difference if the highest root bridge was used?

  2. stickmann

    New Member

    Nov 9, 2012
    Spanning Tree Protocol (STP) uses a default priority number for all ports, which is the main factor when determining the root bridge. If all switches or bridges have the same priority number, it will use the lowest MAC address as a tie-breaker.

    You can change the priority number on a device to ensure it is the root bridge. The lowest priority number becomes the root bridge. Technically, it does not matter which which bridge becomes root, but you want your root bridge to be the switch closest to your network so STP converges faster.