I am planning the deployment of two 5520's which we want to use in transparent mode in order to get a better idea on the type of traffic we have before moving to routed mode. I'm trying to figure out how can I get these firewalls in between the multilayer switches I currently have in place since the firewall only recognizes layer 2 traffic while on transparent mode and switches are being used as layer 3. I am attaching a basic diagram to show you my current setup.
My area is switching and routing and I am now getting into firewalls so please be easy on me : ) Thanks in advance for your assistance!
Yes that's exactly what you can do. As i said though if the existing links between the switches are P2P using a /30 subnet you may need to change the subnet mask because you will need an additional IP from the subnet for the firewall. Note you only need 1 and not 1 for each interface.
Other than that you should be fine.