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Jul 7, 2017 at 17:09 comment added Ron Maupin QoS marking on layer-2 is CoS. You need VLAN tags in order to mark at layer-2. That means you need trunk links.
Jul 7, 2017 at 13:17 comment added Fixitrod QoS is not layer 3 only. There are tagging methods that work in layer 3 but there are other methods that work in layer 2 as well. There is even mapping from layer 2 to 3 for QoS.
Jul 6, 2017 at 16:13 history answered Ron Maupin CC BY-SA 3.0