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Chapter 19: Network Management

Chapter 19: Network Management. Business Data Communications, 4e. Network Management Requirements. Fault Management Accounting Management Configuration and Name Management Performance Management Security Management. Fault Management.

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Chapter 19: Network Management

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  1. Chapter 19:Network Management Business Data Communications, 4e

  2. Network Management Requirements • Fault Management • Accounting Management • Configuration and Name Management • Performance Management • Security Management Business Data Communications, 4e

  3. Fault Management • A fault is an abnormal condition that requires management attention (or action) to repair • Fault is usually indicated by failure to operate correctly or by excessive errors • Users expect quick and reliable resolution Business Data Communications, 4e

  4. Responding to Faults • When faults occur, it is critical to quickly: • Determine exactly where the fault is • Isolate the rest of the network from the failure so that it can continue to function without interference • Reconfigure or modify the network to minimize the effect of removing the failed component(s) • Repair or replace the failed components to restore the network to its initial state Business Data Communications, 4e

  5. Accounting Management • Reasons for accounting management: • Internal chargebacks on network use • User(s) may be abusing access privileges and burdening the network at the expense of other users • Users may be making inefficient use of the network, and the network • The network manager is in a better position to plan for network growth if user activity is known in sufficient detail. Business Data Communications, 4e

  6. Configuration Management • Concerned with: • initializing a network and grace-fully shutting down part or all of the network • maintaining, adding, and updating the relationships among components and the status of components themselves during network operation Business Data Communications, 4e

  7. Performance Management • Issues of concern to the network manager include: • What is the level of capacity utilization? • Is there excessive traffic? • Has throughput been reduced to unacceptable levels? • Are there bottlenecks? • Is response time increasing? • Network managers need performance statistics to help them plan, manage, and maintain large networks Business Data Communications, 4e

  8. Security Management • Concerned with • generating, distributing, and storing encryption keys • monitoring and controlling access to networks • access to all or part of the network management information • collection, storage, and examination of audit records and security logs Business Data Communications, 4e

  9. Network Management Systems • Collection of tools for network monitoring and control, integrated in these ways: • A single user-friendly operator interface for performing most or all network management tasks • A minimal amount of separate equipment • consists of incremental hardware and software additions implemented among existing network components Business Data Communications, 4e

  10. Network Management System Architecture Business Data Communications, 4e

  11. All nodes run the Network Management Entity (NME) software Network control host or manager runs the Network Management Application (NMA) Other nodes are considered agents Components of the NMS Business Data Communications, 4e

  12. Network Management Entity • Collection of software contained in each network node, devoted to the network management task • Performs the following tasks: • Collect statistics on communications and network-related activities. • Store statistics locally • Respond to commands from the network control center • Send messages to NCC when local conditions undergo a significant change Business Data Communications, 4e

  13. IBM Network Management Architecture and NetView • Associated with IBM’s Systems Network Architecture (SNA) • IBM wants to provide the single, unifying framework into which all other network management products feed and from which all the equipment in a user’s network can be controlled Business Data Communications, 4e

  14. Network Management Categories • SNA network management is composed of: • Problem management • Change management • Configuration management • Performance and accounting management Business Data Communications, 4e

  15. Problem Management • Problem determination • Problem diagnosis • Problem bypass and recovery • Problem resolution • Problem tracking and control Business Data Communications, 4e

  16. Change Management • Software change control • Microcode change control • Hardware change control Business Data Communications, 4e

  17. Configuration Management • Physical/logical resource identification • Resource relationship identification Business Data Communications, 4e

  18. Performance & Accounting Management • Response-time monitoring • Availability monitoring • Utilization monitoring • Component delay monitoring • Performance tuning • Performance tracking and control • Accounting Business Data Communications, 4e

  19. Control facility Provides the capability to operate the network. Hardware monitor collects notifications of failures or significant events Session monitor Collects session-related information on logical components of the network; includes measurements of data on response time, session failure Status monitor Displays status information; reactivates network resources following failures Help facilities Descriptions of fields on displays, and a systematic problem-solving facility Customization facilities: Permits a user to tailor NetView NetView Software Business Data Communications, 4e

  20. Technical Control • Automatic and remote testing and monitoring of the system, to reduce downtime due to the need to locate service personnel • Restoring and/or reconfiguring the system upon failure in real time • Providing network performance and functioning statistics to facilitate planning and management for high availability Business Data Communications, 4e

  21. Component-Level Technical Control • Line Monitors • Captures the signal between a host system and the network • Generally employed only on the network end • Protocol Analyzers • Can also simulate various network components • Can test communication protocols and codes • Typically handles up to layer 3 of the OSI architecture Business Data Communications, 4e

  22. Network Technical Control Systems • Integrate control devices and centralize the control of the network Business Data Communications, 4e

  23. Performance Monitoring • After availability, the second most important characteristic of a network is performance • Performance data must be available in sufficient detail to be able to assess the bottleneck that is causing the problem and to plan appropriate remedial action Business Data Communications, 4e

  24. Component-Level Monitoring • Response-time monitors • Measures, displays, and records response time of each transaction and the average response time • Hardware monitors • Events: Number of occurrences of specific events • Timing: Timing the duration of a specific signal • Software monitors • Gathers and reports statistics on hardware and systems and applications software activity Business Data Communications, 4e

  25. Network Monitoring Systems Business Data Communications, 4e

  26. Indicators Reported by Network Monitors • Service Parameters • Availability • Response Time • Accuracy and Integrity • Efficiency Parameters • Througput • Polling • Utilization Business Data Communications, 4e

  27. Simple Network ManagementProtocol (SNMP) • Network Management Model • Management station • Management agent • Management information base • Network management protocol Business Data Communications, 4e

  28. Role of SNMP Business Data Communications, 4e

  29. Protocol Specification • Transmission of a message • Receipt of a message • Variable bindings Business Data Communications, 4e

  30. SNMPv2 • Released in 1992, revised in 1996 • Addressed functional deficiencies in SNMP • Accommodates decentralized network management • Improves efficiency of data transfer Business Data Communications, 4e

  31. SNMPv3 • Released in 1998, addressed security deficiencies in SNMP and SNMPv2 • Does not provide a complete SNMP capability; defines an overall SNMP architecture and a set of security capabilities for use with SNMPv2 • Provides three important services: authentication, privacy, and access control Business Data Communications, 4e

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