I have attached a network diagram to show you how the network is set out.
Everything in the diagram was working until I went to install Managed Switch4 in the diagram. As soon as I connect Managed Switch4 Port8 to Managed Switch3 Port3 we lose connection to the Backup Site and all clients in the Primary Site cannot connect to other devices on the LAN. Strangely as soon as I make the above mentioned connection Cisco ASA A and Cisco ASA B both become Active.
I have configured the network EXACTLY as it is in the diagram. Can you see any problem with my VLANS that would cause the clients in the Primary site to lose LAN connectivity? This all literally happens the second I connect Managed Switch4 Port8 to Managed Switch3 Port3.
I would really appreciate any help, in theory this all looks like it should work fine.