Hi everybody.

I do have following network topology.

My Router works as DHCP Server and Gateway. I am using different VLANS and all traffic goes through the router. This is basically clear and can be demonstrated very easily.

My front door bell (VLAN40) produces GB's of data, which is sent to the storage device (NAS) in VLAN30. Both devices are attached to the same "Switch Keller". you can see that data is passing the Gateway. So my question is, how does Inter-Switch routing work to avoid this? 

I checked several post but could not find some practical instructions. maybe that will not work with my switches at all.

Any ideas are appreciated