That’s right about using OME for the R720 and IT assistant for the 2950. The R720 comes with the iDRAC express, so that one you can configure to use SNMP directly with Openmanage Essentials directly. [URL]
               I want to monitor dell servers via snmp, but all i read tell me i need to install openmanager to get advance monitoring. This is the case, i have a open software to monitoring snmp and i want to centralized monitoring on it, i do not want to get server install local managing only external, and not web access to open manager, only i want get advancwe snmp work in order to retrieve data from other server. Is that possible? how?.    If not possible what option do I have? 
openmanager question