SP Communication

How exactly do I communicate with SPA and SPB to access navisphere?  I connected the crossover cable to each SP and set an IP on the same range as the control station.

I have all my CGE ports connected to an isolated network, not connected to my internal network.  When i try to ping the SP's I get no response.  MY question is, do the SP's communicate through the control station or through the CGE ports?

If its the cge ports, I guess I will then have to connect my iscsi network to my internal lan using VLAN's so I can access the SP's.   Any input is appreciated.