SNMP SMIv2

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SMIv2 = Structure of Management Information Version 2

The STATUS clause in indicates whether this definition is current or historic. 

• “current" means that the definition is current and valid. 
• "obsolete" means the definition is obsolete and should not be implemented and/or can be removed if previously implemented. 
• "deprecated" also indicates an obsolete definition, it permits new/continued implementation in order to foster interoperability with older/existing implementations.

Reference:

RFC2578 SMIv2, section6.1