RSTP Port Roles
RSTP also defines different Spanning Tree roles for ports:
■ Root port—The best path to the root (same as STP).
■ Designated port—Same role as with STP.
■ Alternate port—A backup to the root port.
■ Backup port—A backup to the designated port.
■ Disabled port—One not used in the Spanning Tree.
■ Edge port—One connected only to an end user.