Can you analyze traffic?

Question

Computer networks

We have a local network, cisco router, internet and vpn to the central office. If you stick between cisco and a microtik switch as a switch. It is possible to analyze traffic using traffic flow
If there was access to the router, this question did not arise. The question arose due to an incomprehensible clogging of the vpn tunnel

Answer 1

First reply on google

Answer 2

Perhaps, if only the traffic will pass through this switch.

Answer 3

Tsiska lets all traffic through vpn? Or does some traffic just go to the Internet?
I think that: Just mikrotik as a switch will not be able to recognize traffic that is already wrapped in vpn. And if you put Mikrotik before the cisco, then Mikrotik itself must analyze which traffic to wrap in vpn, and which one to send just to the Internet.