Adding to that you also can consider different platforms - single rack ones and bigger chassis with line cards. In both cases MAC learnt on a particular forwarding engine though mechanisms can be different.
Answering to your specific question "shortly, port has a mac address or a switch? " - mac is learnt when packet already received by port and the forwarding decesion is taken by particular engine. If forwarding decision taken by Line card then MAC is first learnt by that LC forwarding engine and stored in it's memory and further synched with all the other Line Cards and main CPU on platform. If it 1RU switch, then MAC learnt again during the forwarding decision by ASIC controlling that function.
So port itself can't learn as it can't inspect the packet - it is forwarding ASIC which is considering how the packet should be forwarded look at the MAC and stores that within appropriate table.
So yes it is done on port bases - but done by Forwarding Engine.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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