I've been doing some research regarding the Interwork Design Guide and Data Center Infrastructure Design Guide, my question is how does the idea of the 3-tiered model hold true for virtual machine hosts. We are looking at servers with 6 connected NICs, at 20 servers a rack, that's 120 connections to the access layer per rack. Is that normal? I'm also not seeing any value in an aggregation layer. We have no campus core in our datacenter, it's servers connected to switches and switches uplinked to a core switch.