Here's what you have to do to get it going: http://www.vmdork.com/?p=137
Basically, you'll need to install the SNMP Daemon via YaST, configure it, then poll it with Orion. Once SNMP is configured correctly, Orion will see it as a vCenter and you should be squared away.
Let me know if you have further questions as I had this same issue at my previous organization and was able to get it working following these same steps.