There are lots of discovery algorithms that run depending upon what technologies the devices do or do not support. There is no attribute that controls what the connectivity does. In the discovery gui, there are discovery options that you can choose (most are on by default).
To try and figure out why the connections are not made, you can turn on the Autodiscovery debug (from the VNM – Component Detail – AutoDiscovery Control – Debug Options – Debug On).
Run the discovery again, or run a Reconfiguration – Discover Connections. Once complete, disable the debug and on the SS you were trying to discover the connections on, review the $SPECROOT>/SS/AdiscDebug* file.
Cheers
Jay