Traffic-shaping - at what point does it actually occur

Unanswered Question

if we have two routers connected over IPSec/GRE tunnel (tun0 interface at either end) they are sourced to/from each others external Gig1 and each has an internal interface Gig0. IF traffic shaping and qos pre-classification is enabled on the Tun0 - where, exactly, does the traffic shaping occur. Is it on the output queue of the tun or the external outbound interface - is it before or after the encryption encapsulation?

I have this problem too.
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