Hi
I have a stack of two 3850s connected to a Nexus 7k via a L2 access port.
We have found that unless the VLANs match on the 3850 and the Nexus 7K access port you cannot ping between the 3850 and the Nexus 7k (or indeed between hosts connetced to these switches).
So
3850
switchport access vlan 12
switchport mode access
int vlan 12
ip address 10.1.1.1.2 255.255.255.0
N7K
switchport mode access
switchport access vlan 22
int vlan 22
ip address 10.1.1.1 255.255.255.0
Ping from 10.1.1.1 to 10.1.1.2 fails.
Move the port and SVI on the 3850 to VLAN 22 and it works !
This is strange as access ports should not be tagging frames so the vlan should be irrelevant (so long as the SVI is on the matching VLAN).