I am working on a project to design and implement new data center infrastructure Also migrate users from the old network . The current setup is that network has several vlans and each switch is connected to the main switch via fibre. The new network infrastructure will have two core switches 6509, several 4500 series switches for wiring closet and 3750 switches where the devices will be connected. 4500 switch will be connected to both core switches 6509 via fibre. In this situation, what will be the proper network design? Will appreciate any thoughts.