A customer of mine wants to use two interconnected clatalyst 4500R switch on a redundant industrial network. One computer is connected to a 2800 switch that is connected to both 4500R. On the otherside of the network, a PLC is also connected to a 2800 that also connect to both 4500R.
I know that spanning tree protocol will prevent the loops and close redundant port. In case of failure of a network device, then the redundant port will be opened and the traffic will pass through this new route.
What I want to know is on wich OSI level this works. how does the switch sees that traffic can not be forwarded. We do not use TCP/IP for our connection, but directly mac adresses, will this trafic also be routed to the correct adress in case of failure?
Thanks for your help