I dont see any NMS server would be able to give you data for utilization in KB/MB, as it is not a single value to be polled. It is a formula which polls a couple of values and calculate it to give a % of utilization.
Interface use is the primary measure used for network use. Use this formulas, based on whether the connection you measure is half-duplex or full-duplex. Shared LAN connections tend to be half-duplex, mainly because contention detection requires that a device listen before it transmits. WAN connections are full-duplex because the connection is point-to-point; both devices can transmit and receive at the same time because they know there is only one other device that shares the connection. Because MIB-II variables are stored as counters, you must take two poll cycles and figure the difference between the two, hence delta value.
For more details on how it is calculated see :
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a008009496e.shtml
-Thanks
-Thanks
Vinod
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