Designing Network Infrastructure

Hi,
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.
Thanks

through ur discription i havnt heard from u any thing about the ditribution layer!!
u need the distribution layer befor the core layer
in other words
it should be like
access switches-- distribution --core
basicaly
on the access layer creat all the required vlans but keep them on lyer two
dont make and vlan interface
on the distribution layer
creat the same vlans here layer two
and then creat a vlan interface SVI fopr each vlan
and this vlan interface will be the default gateway for the access switches in the corsponding vlan
next if u want or and u see it required make a core layer
while i think u dont need it
in ur case the distibution layer will be called
distribution/core layer
the link between the access switches and the dist. switches must be trunk
if u want redundancy and high availabilty
u need two dist switches with identical config to some extend
i mean the ip addresing not meant to be the same but in the same ranges with regard to each vlan
and configure hsrp on the dist switches
in the case the default gateway for each vlan access layer user will be the vertiual interface of that vlan hsrp group
also u have to make the active switch in the hsrp group the root switch in the spanning tree config
for dhcp make the ip helper address on each SVI on the dist. switching pointing to a dhcp server and useing the proper VIP for that vlan group as the default gateway
and add the
spanning-tree portfast on each access port that will be a dhcp client
good luck
please if helpful rate

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