i've been tasked with installing a card swipe access system. Each door has a switch/controller combo which is wired to another door with a switch/controller combo then eventually to a cisco 3750 switch. So in essence, I have a series of loops all going to a main switch. I know this is not best practice, but unfortunately I have to work with the existing infrastructure. My issue is when a link in the loop goes down, I need to maintain access to the controller server.
I have 1 block of IP addresses to use, and there be approx. 200 of these switch/controller combos, one per door. Every IP device will have a static IP, so no DHCP. All switch/controllers will connect to a main cisco 3750 switch. The controller server is connected to this as well. Each controller communicates with the server.
I have a diagram to show how a portion of the network will look like to help describe the situation.
The switch/controller combo is a controller to manage door access and a switch to connect to the IP network. Ruggedcom switch I think.
The equipment was pre-purchased so I need to work with what I have.
I did use cisco packet tracer to "test" out this network using default configuration, and every time I broke a link in the middle of a loop, it took about 30 seconds to get a connection again. so my question is, how can i configure the cisco switch so that link from controller to server will be maintained via another "route" back to the main switch?
again....this is a physical loop...but i can't change it....sorry :(