Force VLAN traffic through specified interfaces

        I have two VLANs, VLAN1 for "clients" and VLAN2 for (web)servers. Both VLANs have two ports in etherchannel (one Cisco switch). I would like to put transparent (WAF) device in bridge mode between the VLANs in order to monitor/block traffic. What could be the method in order to accomplish this in case of Cisco device (or eliminate this kind of problem). 
For example if I use two physical switches, and connect the trunk ports (and bonded) via the transparent device bridge interfaces I can see the traffic. Im curios about, is it possible to do in one switch between VLANs, if yes what the name or method i should search for? Thank you!

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