Currently, SNMP has three versions:

• SNMPv1—This version is the first version of the protocol. It is described in RFC 1157.
• SNMPv2—This version is an evolution of the first version, and it adds a number of improvements to SNMPv1. It is described in RFCs 1902 through 1908.
• SNMPv3—This version improves the security model in SNMPv2 and adds support for proxies. It is described in RFCs 3413 through 3415.

The vRouter supports SNMPv2 with community string (SNMPv2c) and SNMPv3 with SNMPv3 users.