How does forwarding occur when splitting 40G QSFP to 10G SFP?

Question

Computer networks

Colleagues, tell me about the question below.
There is a diagram:
Port 40G QSFP --->MTP_Cable--->Cassette_splitter_4x10G--->Further 4x10G links go to SFP 10G ports of various devices
Please tell me, on what basis does forwarding occur in this case?
How are SRC_MAC addresses selected / assigned to 10G interfaces if the packet comes from the side of the split QSFP 40G?

Answer 1

Well, somewhere in the depths of my soul 40G is Etherchannel 4x10G
Therefore, when installing a splitter cable for 4 to 10G, this etherchannel is simply broken and work goes on with 4 separate ports.