I got a question concerning two Nexus 5020 and two Fabrix Extender 2000.
The Topology is quite easy. I have the two Nexus 5020 formed to a vPC-Domain and now there are two possibilities to connect the FEXs.
Each Fabric Extender is connected to a single Nexus 5020 with 2x10G. Everything should work fine but there is no redundancy for the FEXs if one Nexus 5020 goes down.
Each FEX is connected with 1x10G to each of the both Nexus 5020 so that there is cabling redundancy. The Nexus 5020 connect to the FEX via a vPC.
Both solutions work BUT....
...with the 1st solution it is possible that I can form a LACP Etherchannel from a Server with two NICs to the FEXs. One Port of the Server on the one FEX and one on the other. The Server has a Full Etherchannel to the Switches.
Now the question:
Is it possible to do this also with the FEXs cross-connected to the Nexus 5020 like in solution No.2? In the Cisco documentation it seems that this seems not to work and seems to be a restriction.