I know I have problem understanding the structure. If there is one or more CPU how do you identify the instance. I usually add .0 or .1 at the end of the OID but it`s not always that simple...How do you intrepret the mib file to make sure the value received is relly what you expect
SNMP MIB objects are of two types: scalar and vector(tabular).In the former case, mostly suffixing of .0 gives you the instance. Latter case requires the table row index to be known for retrieving a particular instance.
Because cpmCPUTotal5minRev is part of a table, one has to provide the index to be able to perform GetRequest or in other words getone from the toolkit perspective.
In such cases, one needs to do a walk to retrieve unknown instances. Every genuine SNMP manager toolkit will have a binary that achieves this walk functionality, and you should use the corresponding binary from the toolkit that you are using.
1) Do a walk on cpmCPUTotalTable
2) cpmCPUTotalPhysicalIndex on each row provides you entPhysicalIndex, a mapping to the corresponding entity represented in entPhysicalTable
Refer to the description clause of cpmCPUTotalPhysicalIndex in the MIB for the complete details
3) Now retrieve the corresponding entPhysicalDescr to find out more details about the physical entity
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