Looking to redesign a flat network, and would like advice in terms of design/equipment needed. The current network has 500 users. Their are 15 data closets with HP 4000 switches, being fed back to one switch via fiber. No vlans are in use. Most network traffic is used to run medical software spread across 6 servers, all housed in the same data center. My plan is to replace the 15 HP switches with catalyst 3500 series switches. I will need to stack these access switches I am assuming as I have up to 60 users connecting per closet, being fed back via fiber. Each closet will be divided into it's own vlan, and will feed via fiber 802.1q trunk, to a distribution switch, where inter-vlan routing for the other switches/subnets can take place. 2 distribution switches will be used. The servers will also connect to the distribution switches this way I am thinking. Any traffic not destined for another vlan/subnet, will be sent right to the pix firewall for internet access, or via static route to our service providers layer 3 switch to our MPLS cloud, which will have 5 remote sites connected. All remote sites are less than 35 users. One site does use voip. Right now, they have their own dedicated 3mbp pipe for voice. In the future, that pipe will be removed and traffic will come back via the mpls cloud. My question is, what flavor catalyst will work in the access and distribution layer to support this environment. Distribution I was thinking a 4500 series? HSRP will be running on the distribution switches, as each access switch will have a connection to both distribution switches.