Hi Darren, What subnets are you using in your external EPG for the two L3Outs? Try using a more specific subnet for one of them. There is also a specific forum for ACI:   https://supportforums.cisco.com/t5/application-centric/bd-p/12206936-discussion...

The vPC seconday will show the Peer-link as the root port and the vPC facing the root switch. The vPC Primary will only show the vPC faving the STP root as the root port. This is expected for vPC.

Hi Ashley,Is the HP server on the Nexus connected via 1G or 10G? I would be interested to see the pause counters on the server interface and the c7000 interfaces. Could you attach the appropriate 'show interface' outputs? Thanks,Carlo 

Luis,Have you tried:1) Reseating the SFP2) Plugged a laptop, or a known working device with a known into the SFP without any patch pannels 3) Try configuring a different port on the Nexus with "speed 1000" and moving the SFP there 4) Test the SFP in ...