There are also provisions for the unsolicited notification of events, through the use of traps. A trap is a user-configurable threshold for a parameter. When this threshold is crossed, the values for one or more parameters are sent to a specified location. A benefit of trap generation is that polling for certain parameters can be stopped or the polling interval lengthened, and instead an automatic notice is sent to the management system when an event occurs.
It is usually easier to instrument network devices with SNMP. SNMP is used in monitoring, instrumentation, and configuration mechanisms, all of which are discussed in the following sections. The monitoring process involves collecting data about the desired characteristics, processing some or all of these data, displaying the processed data, and archiving a subset of these data.
Data are usually collected through a polling actively probing network devices for management data or monitoring process involving a network management protocol e. As we will see later in this chapter, several techniques may be used to get this data, as well as to ensure that the data are current and valid. When the data are gathered, they may or may not reflect the characteristics we wish to monitor.
Values for some characteristics may have to be derived from the gathered data, and other values may be modified e.
This is processing of the data. Sets of raw unprocessed and processed data will need to be displayed. There are different types of displays you may use, including standard monitor displays, field-of-view or wide-screen displays, and special-purpose displays.
Along with choosing displays, you will also want to consider how the data will be shown to the user, administrator, or manager. There are several techniques to display data, such as logs and textual displays, graphs and charts both static and moving , and alarms. Some data may be abstracted by symbols, such as showing parts of the network as a cloud.
At some time during this process, some or all of the data are saved to a semi permanent media or system. This part of the process may have multiple steps, including primary storage, the staging of data for short periods, which could be at the network management server; secondary storage, the aggregation of data from multiple primary storage sites, at a storage server for the network; and tertiary storage, which is usually the most permanent—and slowest—storage within the network.
Secondary and tertiary storage is often termed storage archives. Figure 7. Monitoring for Event Notification An event is something that occurs in the network that is worthy of noting. This may be a problem or failure in a network device, across the network, or when a characteristic crosses a threshold value. It may only be something that is informational to the user, administrator, or manager, such as notification of an upgrade. Events may be noted in a log file, on a display, or by issuing an alarm, depending on the level of priority of the event.
Events are similar to transients, which are short-lived changes in the behavior of the network. Thresholds or boundaries may be set on end-to-end, per-link, or per-element characteristics for short-term or immediate notification of events and transients. This is termed here real-time analysis.
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Ping is used to gather round-trip delay information, which is presented as a chart on the monitoring system. A threshold of ms has been chosen for this display. When this threshold is crossed, it triggers an alarm to notify the network manager that a problem may exist in the network. This book is not yet featured on Listopia.
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Students who are taking CS must make it a habit to check IVLE regularly for Lecture notes, tutorials, assignments and announcements. This website does not have any of the materials that are distributed via IVLE, and has only announcements and information about the module for the benefit of all those students who do not have access to IVLE prior to registering this module.
The module CS is now revamped and students must note the following important information. Since prerequisite for CS is CS, it is assumed that students have all basic knowledge of networking. Our objective in this practical oriented course is to maximize the educational experience of those students who bring a sincere effort and serious interest in the subject matter to the classroom. Last updated : To enable students to analyze networking requirements, ask proper networking questions, and know where to seek answers to those questions.
To enable students to acquire sufficient knowledge and self-confidence to undertake such tasks as design, administration, and troubleshooting of networks after a couple of years of working experience. Final Exam. Mid Term. Tutorial Participation. Davie, Morgan Kaufmann Pub, Inc. Keshav, Addison Wesley Logman, Inc. Moy, Addison Wesley. Thursday Tutorial Meets.
Network Management Know It All
One hour per session, 11 sessions. First Tutorial. Week on 27 August. Tutorial Sessions. Friday, 30 November Afternoon. Week 0.
Network Management Know It All (Morgan Kaufmann Know It All)
Revision of Concepts. Lecture 1. Week 2. Lecture 2.
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