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the internetworks This information is used to facilitate the troubleshooting process by allowing users to be located quickly It also is used as a reference to know the number and location of network users to plan for network growth Connectivity testing Many problems are the result of not being able to establish a connection between two devices on the network A protocol analyzer can become a node on the network and send frames (such as a ping) to a network device and then determine if a response was sent and, if so, the response time In the case of multiple paths through the network, a more sophisticated test can determine which paths were taken Connectivity can be verified in many WANs by executing a call placement sequence that establishes a call connection to enable a data transfer Conformance testing Conformance testing is used to test data communications devices for conformance to specific standards These conformance tests consist of a set of test suites (or scenarios) that exercise data communications equipment fully and identify procedural violations that will cause problems These conformance tests are used by developers of data communications equipment and by carriers to prevent procedural errors before connection to the network is allowed Conformance tests are based on the applicable protocol standard 246 Protocol Analysis Measurements Protocol analyzer functionality varies depending upon the network technology, such as LAN vs WAN; the targeted user, such as R&D vs installation; and the specific application, such as fault isolation vs performance monitoring Protocol analysis includes the entire set of measurements that allow a user to analyze the information on a computer communications network But no single product provides all of the following measurements for all networking technologies:
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Protocol decodes Protocol statistics Expert analysis Traffic generation Bit error rate tests Simulation Programming language
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Because protocol analysis requires combining and integrating the results of different measurements, the listed measurements typically are made in combination Thus, protocol analyzers include different sets or combination of these measurements A good user interface combines and presents pertinent information for the user in a maximally useful way
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Protocol decodes, also referred to as packet traces, interpret the bit streams being transmitted on the physical media A protocol decode, as the name suggests, actuDownloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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ally decodes the transmitted bit stream, identifying it and breaking it into information fields The decoded fields are compared to the expected values in the protocol standards, and information is displayed as values, symbols, and text If unexpected values are encountered, then an error is flagged on the decode display Protocol decodes follow the individual conversations and point out the significance of the frames on the network by matching replies with requests, monitoring packet sequencing activity, and flagging errors Protocol decodes let the user analyze data frames in detail by presenting the frames in a variety of formats Decodes typically are used for troubleshooting The ability to troubleshoot a problem is directly related to the ability to capture the frames from the network Protocol conversations are based on sequences of frames If a protocol analyzer misses frames, then protocol conversations are not recorded accurately and the troubleshooter cannot tell which is at fault, the protocol analyzer or the network It is therefore essential to capture all of the frames without dropping or missing any Since protocol analysis can be done in one of two ways, either real-time or postprocess, most analyzers provide a method for capturing and storing frames for subsequent decoding Some analyzers also provide the capability to decode frames as they are captured (in real time) This allows the user to display data traffic as it occurs, eliminating the need to stop the testing to find out what is happening on the network Network problems are isolated by starting at an overview level and then focusing in on the network traffic in ever-increasing detail Since a protocol stack is essentially a virtual network operating on the physical medium, and many such virtual networks can coexist on one physical medium, protocol decodes can display all of the network traffic or the protocol decode can be filtered to isolate a single protocol stack or a particular protocol
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Decode display formats Protocol decodes typically are displayed in three formats: a summary decode, a detailed decode, and a data decode (Figures 246a, 246b, and 246c) These examples show a frame captured from the World Wide Web The HTTP protocol is executing over TCP/IP on a 10Base-T network The summary decode shows a consolidated view of the frame information The contents of each frame are summarized into one line on the display This is used to quickly determine the type of traffic being transmitted on the network and to determine the upper-layer protocol conversations that are occurring The summary decode uses an underline cursor to aid in viewing a specific frame, as well as to indicate the frame that is examined in further detail using a drill-down user interface In Figure 246a, frame number 4624 is underlined The summary decode gives a reference number for the frame, a timestamp for the specific frame, the source and destination addresses (in this case the MAC addresses), and the description field of the information contained in the frame, including encapsulated protocols, address and control information, and error information The detailed decode (Figure 246b) breaks out all of the protocols in the underlined frame and identifies all of the fields in each protocol It describes each field in the protocol layer and identifies all parameters with a textual description as well as the actual field values This decode view is used to troubleshoot specific problems within a protocol or in a transaction between devices on a network
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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