I would agree with @RobinClayton @OtakarKlier @jeremy.larsen here... this is not simply getting rid of a switch but also redesigning your outbound traffic layer... today, specific traffic (SIP/VoIP) is directed via some kind of route engineering (I assume) to go thru the PA220 and the rest is engineered to go thru CP and bypass the PA220... the proposed design now puts the PA220 in line with the CP and capacity issues aside you still need a common L2 north/south of the CP FWs for HA to work and pushing that to the PA220 is just moving the same functionality to a new spot...
If full resiliency is required, you have HA on the CP FWs, then having redundant L2 switches north/south gets you there as a failure on either switch means use lose outbound connectivity regardless of the HA on the CP FWs.
On the capacity front it would be recommended to understand the traffic load/rates currently going thru the CP FWs and add that to what the PA220 is currently doing to see if it can handle the additional load, you still would have a SPOF as the PA220 is not in HA...
Lots of things to consider, perhaps reaching out to your SE to have a more detailed conversation on this would be a good next step.
I should mention that what I want to do, we are currently doing with another/2nd PA-220 that we have that handles both the 1) gateway for our public Wi-Fi what 2) also feeds our main checkpoint firewall for another connection on the Checkpoint.
But in that case the Wi-Fi (using the PalAlto as the layer 3 router) and the connection to our Checkpoint Firewall (via a layer 2 to layer 3 connection on the Palo Alto) are using completely different subsets with their own distinct gateway.
I was hoping I could do the same thing with the PaloAlto PA220 that handles the SIP traffic and the Layer 2 connection from the unmanged switch to the Checkpoint firewall that both use the same subnet as originally proposed in this thread.
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