For those of you who are wondering what network devices are supported and to what extent out of the box by SCOM 2012 Microsoft has published a spreadsheet.
Microsoft System Center Operations Manager 2012 provides the ability to discover and monitor network routers and switches, including the network interfaces and ports on those devices and the virtual LAN (VLAN) that they participate in. Operations Manager can tell you whether network devices are online or offline, and can monitor the ports and interfaces for those devices.
Operations Manager 2012 can monitor network devices that support SNMP, and can provide port monitoring for devices that implement interface MIB (RFC 2863) and MIB-II (RFC 1213) standards.
You can find the list here: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=26831
