For every best practice, there is a history as well as exceptions. The best practice you are talking about (separate physical links for different traffic types) is rooted in the 1GbE world where bandwidth was a consideration. In a 10GbE infrastructure, it is common to aggregate the traffic types on the same physical link because there is more bandwidth. If you still want NIC separation in the UCS you can always use the Virtual Interface Card (VIC) to carve up several vNICs for the different traffic types for both administrative separation and QoS opportunities on each NIC. As with any "best practice," it is best to question and know the history behind the best practice and examine whether it still applies today to your particular environment.
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