I have about 5 access switches connected via fiber to a main switch in the MDF. The MDF switch has been manually configured as the root switch and 3 of the 5 switches acknowledge it as root. The final ones do not. Switch 4 is directly connected to the MDF via fiber and is also connected to switch 5 which regards its own self as root. Switch 5 is not directly connected to MDF, but is part of the switching fabric and is inheriting VLAN information. How do I make it so that the remaining switches view the MDF as root?