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._________________________________________________________________________________________________________________________________________________________________________________________________________23 Discuss the output of the show bridge [bridge-number] command._________________________________________________________________________________________________________________________________________________________________________________________________________24 What messages does the debug vlan packets command display?_________________________________________________________________________________________________________________________________________________________________________________________________________25 What are the two forms of the Cisco IOS s debug span command?_________________________________________________________________________________________________________________________________________________________________________________________________________ This chapter covers the following topics that you will need to master to pass the CCNPSupport exam:Objective Description1 Frame Relay troubleshooting process.2 The IETF frame structure for Frame Relay.3 The Frame Relay diagnostic show commands.4 Frame Relay loopback testing.5 The Frame Relay diagnostic debug commands.6 Frame Relay problem isolation. C H A P T E R10Diagnosing and Correcting FrameRelay ProblemsFrame Relay is a connection-oriented OSI Layer 2 protocol.Frame Relay fits in the packet-switching category for wide-area network technology.Currently most of theimplementations use permanent virtual circuits (PVCs) to connect remote offices, andmany organizations are testing switched virtual circuits (SVCs).This chapter s focus is ondiagnosing and correcting Frame Relay PVC networking on Cisco serial interfaces.Eventhough the chapter is not intended to provide a course on Frame Relay configuration, thetroubleshooting tips discussed involve many of the Frame Relay configuration commands.A comprehensive list of related Cisco IOS show and debug commands is presented toenhance your diagnostic skills to support Frame Relay networks. Do I Know This Already? QuizIf you wish to evaluate your knowledge of the contents of this chapter before you getstarted, answer the following questions.The answers are provided in Appendix A, Answers to Quiz Questions. If you are having difficulty providing correct answers, youshould thoroughly review the entire chapter.If all or most of your answers are correct, youmight want to skim this chapter for only those subjects you need to review.You can also usethe  Foundation Summary section to quickly review topics.Once you have completed thechapter, you should reevaluate yourself with the questions in the  Q&A section at the end.Finally, use the companion CD-ROM to evaluate your knowledge of the topics and see ifyou need a review.1 What is the default frame type for the serial interfaces of Cisco routers that have beenconfigured with the encapsulation frame-relay command?_________________________________________________________________________________________________________________________________________________________________________________________________________ 308 Chapter 10: Diagnosing and Correcting Frame Relay Problems2 What are the two frame types supported on the Frame Relay (serial) interfaces of aCisco router?______________________________________________________________________________________________________________________________________________________________________________________________________3 Can the LMI type be autosensed by any of the IOS releases?______________________________________________________________________________________________________________________________________________________________________________________________________4 What are the LMI types supported by Cisco IOS?______________________________________________________________________________________________________________________________________________________________________________________________________5 Does the LMI type have to be identical on both ends of a Frame Relay connection?______________________________________________________________________________________________________________________________________________________________________________________________________6 What are the main pieces of information that you can obtain from the output of theshow interface serial n command?______________________________________________________________________________________________________________________________________________________________________________________________________7 If the LMI type of Cisco is used on a Cisco router s serial interface, which DLCInumber is used on that interface for LMI purposes?______________________________________________________________________________________________________________________________________________________________________________________________________  Do I Know This Already? Quiz 3098 If the LMI type of ANSI is used on a Cisco router s serial interface, which DLCInumber is used on that interface for LMI purposes?_________________________________________________________________________________________________________________________________________________________________________________________________________9 Give at least two reasons for a Frame Relay serial interface being reported as up andits line protocol reported as down._________________________________________________________________________________________________________________________________________________________________________________________________________10 Discuss the reasons for a serial interface being reported as down [ Pobierz całość w formacie PDF ]

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