SNMP Versions
Iotellect Network Manager supports SNMPv1 (Simple Network Management Protocol version 1), SNMPv2c (Community-Based Simple Network Management Protocol version 2) and SNMPv3 (Simple Network Management Protocol version 3).
SNMPv1 is the initial implementation of the SNMP protocol. This is still the primary SNMP implementation that many vendors support. The current state of the SNMPv1 is defined by RFC 1157, RFC 1155, RFC 1212, RFC 1213, RFC 1215.
SNMPv2c, defined in RFC 1901, RFC 2578, RFC 2579, RFC 2580, RFC 3416, RFC 3417 and RFC 3418, improves version 1 in the areas of performance and manager-to-manager communications. SNMPv2 is incompatible with SNMPv1 in two key areas: message formats and protocol operations.
The main issue about SNMPv1 and SNMPv2c is their poor security model.
SNMPv3 (also known as STD0062) enhances security by adding confidentiality, integrity and authentication features. This SNMP version is defined by RFC 3411 -- RFC 3418. IETF designated SNMPv3 a full Internet Standard (the highest maturity level for an RFC) and recognizes it as the current standard version of SNMP.
In practice, all the mentioned SNMP versions are currently widely used. RFC 3584 describes general aspects of coexistence between these SNMP versions.
 | If you receive a negative value for some OID and your device support a higher version of SNMP protocol please switch to it from SNMPv1. SNMPv1 doesn't support 64-bit counters, that's why big value of your OID can't be shown in correct way. |
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