I'm studying for CCDP and am currently sitting on page 271 for those of you that have the official book (642-874).
Similar topology to book here.
If I understand correctly, in an Active/Active FEX design two Cisco Nexus 5000s plug into two Cisco Nexus 2000s which in turn plug into the server. There is a two way vPC between the 2000s and 5000s (it doesn't look like that's shown in the picture though). However, because there is a vPC between the FEXs and the Nexus 5000 you cannot have a vPC between the FEXs and the servers. Why is this? Any clarification on at a conceptual level of how an Active/Active FEX configuration works is also appreciated. I've read the section, but since I haven't had hands on with any of this equipment I'm having some trouble conceptualizing everything. Thanks for your time.