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Network management is a process to control networks with great efficiency. So far, network management protocols have changed from SNMPv1, SNMPv2 to SNMPv3. This paper briefly compares and analyses these versions on SMI & MIB, protocol operation, security and access control. Besides, it thoroughly summarizes most research aspects of recent SNMP developments, especially the next generation network and new technologies. It also analyses and points out the most promising aspects. 1 SNMP’S DEVELOPMENT AND HISTORY With networks’ growing popularity in recent years, network management has become more and more difficult and important. In order to effectively manage all kinds of networks and instruments, IAB published the first SNMP (simple network management protocol) in August 1988. However, SNMPv1 contains several flaws. IAB published a group of standard MIB managed objects called RMON in November 1991. Moreover, in order to strengthen security in SNMPv1, IAB introduced SNMPsec in July 1992. Based on both the RMON and SNMPsec, SMP was put forward and used as a foundation for SNMP version 2. SNMPv2, published in 1993, makes great progress in distributed network management, data types, ability to deal with malfunctions, compared with SNMPv1. Yet SNMPv2’s security performance hasn’t been improved significantly. Therefore, SNMPv2u, SNMPv2p and SNMPv2* were developed under the demands of equipment providers.In order to unify all the versions, IETF published SNMPv2c in 1996, which is a modified version based on SNMPv2, and focuses on functional improvement. IETF SNMPv3 group released RFC2271-2275 in January 1998, which is SNMPv3. SNMPv3 includes all the functions and frameworks which are implemented in both SNMPv1 and SNMPv2. Besides, SNMPv3 defines new security characters such as identification and encryption. 2 SNMP’S COMPARISON AND ANALYSIS There are several aspects included in SNMP: • SMI & MIB • Management operation • Security and access control During SNMP’s major versions’ developments, three aspects above have been modified and improved continuously. The following parts will tersely discuss and compare the major versions of SNMP separately in three aspects through tables.

SURVEY ON SNMP IN NEXT GENARATION NETWORK