Hierarchical Network Management Based on Extended SNMP

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In this paper, we present an analysis of the problems involved in both centralized and distributed network management architectures and present a scheme of Hierarchical Network Management based on Extended SNMP as our solution. The status field in SNMP PDU Format is newly defined so that various management policies can be encapsulated into the SNMP PDU and sent from main manager to sub manager. The management task, which achieves concrete management activities on side of the sub manage, is created and executed according to management policy. One of the advantages of the proposed method is distribution of all monitoring tasks and data processing tasks to each sub manager so that the load of main manager and the traffic of management information on the backbone network can be significantly decreased. In addition, it is possible to obtain high-level management result from the sub manager directly by using free-designed management policy. The management framework is easy to implement on all versions of SNMP and makes the management system more flexible and scalable. Implementation examples are also given.

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