For the past few days i have been trying to get multiple VLan's working that are redundantly connected. One VLan would be connected through a controller and to the other switch. Then a second cable to make this connection redundant. Also, there are servers connected on both switches that need to communicate with all the controllers (on all VLans). And I cannot seem to get it to work.
So my first question is.. Is this even possible? And if so.. How would I go about this?
This network is a simple representation of the bigger network with more switches and more controllers. The normal connection for our controller is that they are connected between the switches and a cable from 1 switch to another. This is because we need it to be redundant in case 1 of the cables breaks, and we cannot afford a disconnection at any time. The reason we started thinking of VLAN's is because the traffic in our network is getting very large and out controllers are slowly reaching their limits.
Our entire network runs on a single subnet because that is how we identify all of our controllers in the network.
Edit: Our controllers also act as switches The controller ports are running RSTP. I have the VLAN setup so port 1 and 2 have a PVID of 10 and 3,4 of 20 (on both switches). The servers both have Tags of the VID 10 & 20.
Edit2: I have tried the setup with 2 VLAN's and 1 Trunk cable. RSTP. If I disconnect the trunk cable (on the left switch), the right server cannot connect (ping) the controller on VLAN 10 (the other way around as well). Disconnecting either VLAN cables does not affect the system.