I have been tasked to design a redundant connection point between my enterprise network and my internet provider.
I have multiple buidlings. Two of them have a direct fiber line from the provider to our buildings.
The first one has an S4 router that is our single point of contact. In addition, it has the DHCP Server, and a SonicWall Firewall IDS.
The second has just the incoming cable with no connections.
What I want to do is build up the second wall for "Cluster" operations (can't find the right word). If building one goes down, then building two can handle the load. We are also considering a second Exchange server there.
I need a recommendation on how to handle that second point. I want to find a way to create the second "gateway", IDS, and domain controller.
The concern I have is what I don't know. my fear is spanning tree issues due to multiple gateways. In addition, I fear competing services, as well as other things I don 't know.
How do I get started?