I had the same thing with Cisco 3850's and 3650's and a slightly older version of NPM/NCM. The issue was resolved when we upgraded to the current version 11.5.2 and 7.4. I bet the Nexus 56128's will be recognized at the next version upgrade, just as my newer Cisco switches were unrecognized by Machine Type previously, and now are correctly identified for sorting.
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