Abstract: With the development of triple play, the type of business increases and the number of devices increases dra- matically. Some problems, such as the data repeat sending, large broadband overhead and low efficiency, are more serious in typical SNMP network management system based on unicast mock. An improved SNMPv3 model supporting multi- cast was proposed and the concepts of multicast group and the entity of group proxy were introduced. In the improved SNMPv3 modcl,the definition of MII3 was extended and the SNMP engine was improved to identify and process the multicast messages. The improved model and main modules on management stations and proxies were given respective- 1y. Then the implementation flows of group management and data collection based on improved model were described. hhe test results for the prototype system show that the data collection based on multicast polling can save the resource of senders, reduce network traffic and improve the data query and data collection efficiency greatly.

Key words: Multicast, SNMPv3 , Network management, Management information base