I tried to monitor a switch with SCOM through SNMP. The switch is found but I just see if it's up or down.
No port, CPU or memory information is shown.
I read somewhere that there is a management pack available, but I can't find it for downloading.
Does it need to be purchased?
You might be thinking of the BNA -> SCOM management pack? This needs BNA, it doesn't go direct from SCOM -> switch.