Currently running some ISR4400s as my ISP CEs and looking to eliminate these for reasons that I stopped arguing with leadership on. I believe they should be there, but honestly internet edge is simple enough I do not really need them. I did get some layer 3 switches to put in front of my firewalls though, which I can essentially make "routers" so win/win. But that being said I have seen people use this internet switch layer as layer 2 vs layer 3. Any reason to do one vs the other? I have three blocks of IPs that are assigned to me. ISP gives me ethernet hand off with a /30 and I use my blocks on the other side of that /30. So currently my routers terminate the /30 on the outside interface and my assigned blocks on the inside interface. Moving to the switches, I was going to just terminate the /30 on a no switchport interface and make my public blocks vlan interfaces and assign ports in those vlans to my firewall outside interfaces.
How are you running this edge internet design? I already have simulated it and it works fine with my design, but looking to see others perspective.
