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The elements defined in the MIB can be extremely broad (for example, all objects created by private businesses) or they can be extremely specific (like a particular Trap message generated by a specific alarm point on an RTU.)
Each element in the MIB is given an object identifier, or OID. An OID is a number that uniquely identifies an element in the SNMP universe. Each OID is associated with a human-readable text label.
One of the best tactics for addressing MIB problems is to simply read through the file. As a MIB (SNMP) file is just ASCII text, you can view it in any word processor or text editor (even Notepad). Some manufacturers provide grouped MIBs in binary format, but those aren't readable. You want the raw ASCII version of the MIB (SNMP) file.
Your SNMP manager needs the MIB in order to process messages from your devices. The MIB is also your best guide to the real capabilities of an SNMP device. You need to be able to read the MIB so that you can have a good idea of what assets you do have.
The OIDs identify the data objects that are the subjects of an SNMP message. When your SNMP device sends a Trap or a GetResponse, it transmits a series of OIDs, paired with their current values.
The location of the OID within the overall SNMP packet is shown above.
Here's an example: 184.108.40.206.4.1.26220.127.116.11