We are replacing our CAT5 cable with CAT6 and found that that the Windows Server 2003, Enterprise Edition Node1 and Node2 servers are linked to each other via a CAT5 cable running between the servers to their second nic card. The first nic's on each are connected to the switch like a normal server.
This resulted in the network connection being broken when the cable CAT5 cable to the switch was swapped for CAT6 which also means the connection to the network has no backup. In this particular case, Node1 lost the connection and Node2 does not take over automatically, it needed to be enabled.
Is it normal for clustered servers node1 and node2 to be linked directly via nic and rj45 cable and what is the function of this connection?
Should a third additional NIC be installed to backup nic one?