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Workaround is:
1. Downgrade N7k to version n7700-s2-dk9.6.2.10
2. Configure and connect N2K-C2248TP-E-1GE to N77k
3. Upgrade N5K-C5672UP to version n6000-uk9.7.1.3.N1.2
4. Disconnect FEX from N77k and connect to n5672UP the same manner ( port-channel...