Physical interface
A tunnel interface or a VLAN interface is a true logical interface; it behaves like any other interface (with a few exceptions; for example, tunnel interface does not have an output queue) and you can use most QoS actions (including shaping) on it. A dialer interface is even more “conceptual”. It can never be operational on its own – as soon as the link is established, it’s bound to a physical (for example, BRI0:1) or virtual access interface (which is yet again bound to a physical interface) and the shaping is performed on the final physical interface.
Reference2
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