The Infrastrcuture for Network management in Java

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The Infrastrcuture for Network management
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analogy, the MIB corresponds to quantitative data (measures of activity, productivity, and budget, with the latter being setable by the managing entity!) exchanged between the branch office and the main office We'll study MIBs in detail in section 83 Finally, also resident in each managed device is a network management agent, a process running in the managed device that communicates with the managing entity, taking local actions on the managed device under the command and control of the managing entity The network management agent is the branch manager in our human analogy
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The third piece of a network management architecture is the network management protocol The protocol runs between the managing entity and the managed devices, allowing the managing entity to query the status of managed devices and indirectly effect actions in these devices via its agents Agents can use the the network management protocol to inform the managing entity of exceptional events (eg, component failures or violation of performance thresholds)
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Although the infrastructure for network management is conceptually simple, one can often get bogged down with the network-management-speak vocabulary of "managing entity," "managed device," "managing agent," and "management information base" Hopefully, keeping the human organizational analogy and its obvious parallels with network management in mind will be of help as we continue through this chapter Our discussion of network management architecture above has been generic, and broadly applied to a number of the network management standards and efforts that have been proposed over the years Network management standards began maturing in the late 1980's, with OSI CMISE/CMIP (the Common Management Service Element/Common Management Information Protocol) [Piscatello 1993, Stallings 1993, Glitho 1998] and the Internet SNMP (Simple Network Management Protocol) [Stallings 1993, RFC 2570, Stallings 1999, Rose 1996] emerging as the two most important standards Both are designed to be independent of vendor-specific products or networks Because SNMP was quickly designed and deployed at a time when the need for network management was becoming painfully clear, SNMP found widespread use and acceptance Today, SNMP has emerged as the most widely used and deployed network management framework We cover SNMP in detail in the following section
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References
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[Glitho 1998] R Glitho, "Contrasting OSI Systems Management to SNMP and TMN," Journal of Network and Systems Management, Vol 6, No 2, (June 1998), pp 113-131 [Piscatello 1993] D Piscatello and A Lyman Chapin, "Open Systems Networking", Addison Wesley, 1993 [RFC 2570] J Case, R Mundy, D Partain, B Stewart, "Introduction to Version 3 of the Internetstandard Network Management Framework" RFC 2570, May 1999 [Rose 1996] M Rose, "Simple Book, The: An Introduction to Internet Management, Revised Second Edition," Prentice Hall, 1996
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The Infrastrcuture for Network management
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[Stallings 1993] W Stallings, "SNMP SNMP v2 and CMIP The Practical Guide to Network Management Standards," Addison Wesley 1993 [Stallings 1999] W Stallings, "Snmp, Snmpv2, Snmpv3, and Rmon 1 and 2," Addison Wesley, 1999
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Copyright 1999 James F Kurose and Keith W Ross All Rights Reserved
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The Internet Network Management Framework
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83 The Internet Network Management Framework
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Contrary to what the name SNMP (Simple Network Management Protocol) might suggest, network management in the Internet is much more than just a protocol for moving management data between a management entity and its agents, and has grown to be more complex than the word "simple" might suggest The current Internet Standard Management Framework traces it roots back to the Simple Gateway Monitoring Protocol , SGMP [RFC 1028] that was designed by a group of university network researchers, users, and manager; their experience with SGMP allowed them to design, implement, and deploy SNMP in just a few months [Lynch 1993] - a far cry from today's rather drawn out standardization process Since then, SNMP has evolved from SNMPv1 through SNMPv2 to the most recent version, SNMPv3 [RFC2570], released in April 1999 When describing any framework for network management, certain questions must inevitably be addressed:
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What (from a semantic viewpoint) is being monitored And what form of control can be exercised by the network administrator What is the specific form of the information that will be reported and/or exchanged What is the protocol for communication protocol for exchanging this information
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Recall our human organizational analogy from the previous section The boss and the branch managers will need to agree on the measures of activity, productivity and budget used to report the branch office's status Similarly, they'll need to agree on the actions the boss can take (eg, cut budget, order the branch manager to change some aspect of the office's operation) At a lower level of detail, they'll need to agree on the form in which this data is reported (eg, In what currency (dollars, euros ) will the budget be reported In what units will productivity be measured ) While these are trivial details, but they be agreed upon, nonetheless Finally, the manner in which information is conveyed between the main office and the branch offices (ie, their communication protocol) must be specified The Internet Network Management Framework exactly addresses the the questions posed above The framework consists of four parts:
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definitions of network management objects known as MIB objects In the Internet network management framework, management information is represented a collection of managed objects that together form a virtual information store, known as the Management Information Base (MIB) A MIB object might be a counter, such as the number of IP datagrams discarded at a router due to errors in an IP datagram header or the number of carrier sense errors in an Ethernet interface, descriptive information such as the server software running on a DNS server; status information such as whether a particular device is functioning correctly or not, or protocol-specific information such as a routing path to a destination MIB objects thus define the management information maintained by a managed node Related MIB objects are gathered into so-called MIB modules In our human organization analogy, the MIB defines the information conveyed between the branch office and the main office a data definition language, known as SMI (Structure of Management Information) that defines the
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