There are a number of different methods for connecting Cisco C-Series UCS servers back to the Fabric interconnect (FI) depending on the traffic types you want as well as the speed of the link.
UCS servers generally need 2 paths back to the UCS, data and management. I have a feeling there is a way of combining these into 1 but as of this point I cannot find it.
One of the scenarios (possibly the cheapest) involves connecting the data connection directly into the FI. The management connection goes through the FEX as normal and the data connection can plug directly into the FI using an onboard gigabit ethernet port and a GLC-T optic in the FI. The caveat on this is that it would be data only with no support for FC / FCOE. For this you would need to use a PCI-E VIC card in the server.
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