Apologies if this seems kind of simple but I just can't get my head around it. The attatched network diagram is what my network looks like now but future connections will extend this at least 12 systems which will be connected in a daisy chain format, although not ideal but this is due to locations and expense of the Radio WPtP.
All devices that have an ip address on the network (30-40 per site) are currently all on the subnet in a class B format so that everyone can see everyone, there are 8 xp based machines at each site.
each site has 3 Cisco 3750G 24 ethernet port switchs, 2 hanging off the Main switch which also has the 2 Wireless PtP ethernet devices attached.
So what I have been trying to do unsuccesfully is to give each site a subnet and then allowing routing between each subnet, do to this network only having the Layer 3 switches I believe the way this should be done is put all the devices in a VLAN and therefore eseentially have a vlan per site. So my thought was to keep the two switches that go in the main switch as Layer 2 and then make the Main switch a Layer 3 allowing inter-vlan routing? Does this sound correct or have I totally got the wrong end of the stick?
I have read case studies that do creat 2+vlans per switch and then the top switch allows devices that are attached to the same vlan via another switch to talk.
If you think that this is a complecated process I would be more than happy to read up on it but I have been struggling to find configuration and explanations on the internet.