Cisco Nexus 7K Series FDB

I don’t know whether it’s a bug or just lacking of implementation.
But only arp table work , the FDB table is empty on Nexus7K.
It works fine on 2960 Series.

Cisco does not implement the MIB to expose the FDB table (at least on Nexus5k. I suppose 7k is the same). So there is no way to do it.