This question may sound strange, but I do wonder if we can cascade two CN1610's to form the cluster interconnection. By that I mean a node is connected to a CN1610, and this CN1610 is connected to another CN1610, then to another node. To provide path redundency, another 2 CN1610's are needed, so this involves total 4 CN1610's.
If I recall correctly, NetApp uses Automatic Private IP Addressing (APIPA) for the IP addresses of cluster LIF, that is an IP address like 169.254.x.x. For each interconnection, 2 CN1610's form a single Layer-2 so two controllers at each side can still communicate with each other using its 169.254.x.x IP address as if only one CN1610 is between them.
Any replication would be appreciated in advance. Thank you.