Ok, time for a design lesson. Cisco's states the following - "Cisco's philosophy discourages trunking across the core, therefore discrete VLAN1 connections are made between the distribution and core switches". Let's step back and see. There is no Layer 3 activity that needs to go on in the core. The core is strictly Layer 2, for the purpose of fast switching. If you carry trunks between your core switches, then you carry all the unnecessary VLANs and other traffic, something that in a large environment has no purpose to travel through the core.
Now, I'm not saying trunks won't work, but why carry everything else, if all you need is VLAN1? All I'm saying is that if you're designing a Campus Network, that's the recommended design from Cisco. Doesn't mean anyone has to follow their reference design, but since they manufacture and design their equipment, have the necessary labs to actually build and test all of these technologies in practice, shouldn't we at least look and see if they have a point? Maybe their model is the one that is most suitable if you're trying to design a robust and resilient campus network?
All things to consider. I was suggesting, looking at sreid's post, that it looks like his network would be a candidate for the switchblock design.
Piass, maybe you want to consider reading through CiscoPress's Building Cisco MultiLayer Switched Networks, ISBN# 1578700930.
