Tài liệu Remote ISDN Site not Answering doc

1-2 Semester 8 Internetwork Troubleshooting v1.0 - Lab 9.2.4 Copyright  2001, Cisco Systems, Inc. Lab 9.2.4: Remote ISDN Site not Answering ISDN Atlas 550 192.168.16.0/24 4/1 4/2 BRI0/0 51055512340001 51055512350001 BRI0/0 51055540000001 51055540010001 .3 .7 192.168.0.0/24 192.168.200.0/24 SanJose3 London .3 .1 Fa0/0 Fa0/0 Objective: Establish an ISDN BRI to ISDN BRI call from a branch office to a central site. Scenario: The London network administrator informs you that there is no WAN connectivity. ISDN connectivity has been lost between London and San Jose. After some investigation you contact the San Jose administrator. Based on logs maintained in San Jose, there has not been a successful ISDN session since yesterday when a security audit was performed. Though International Travel Agency (ITA) does not rely on sensitive “top- secret” information, the database of customer information has to be kept confidential. Also, the integrity of the reservation systems is mission-critical. Partners and customers need access to information, but the ability to modify information must be restricted and monitored. Step 1 Cable the lab as shown in the diagram. Load the Lab9-2-4-London-BrokenConfig.txt and Lab9-2-4-SanJose3- BrokenConfig.txt configuration files. Step 2 Start by turning on debug dialer and debug isdn events while attempting to ping London from SanJose3. Is the call being connected? 2-2 Semester 8 Internetwork Troubleshooting v1.0 - Lab 9.2.4 Copyright  2001, Cisco Systems, Inc. Step 3 Gather more information by attempting an ISDN session with PPP specific debugging turned on. SanJose3#undebug all All possible debugging has been turned off SanJose3#debug ppp authentication PPP authentication debugging is on SanJose3#debug ppp negotiation PPP protocol negotiation debugging is on London#undebug all All possible debugging has been turned off London#debug ppp authentication PPP authentication debugging is on London#debug ppp negotiation PPP protocol negotiation debugging is on London#ping SanJose3 Step 4 Based on the output of the previous commands, what are some possible reasons an ISDN call cannot be established between London and SanJose3? What is your action plan to resolve the problem and establish ISDN connectivity between London and SanJose3? Step 5 Implement your action plan and observe results by attempting an ISDN session. Step 6 Document your work with summary of problem, troubleshooting methods and resolution. . - Lab 9.2.4 Copyright  2001, Cisco Systems, Inc. Lab 9.2.4: Remote ISDN Site not Answering ISDN Atlas 550 192.168.16.0/24 4/1 4/2 BRI0/0 51055512340001. London .3 .1 Fa0/0 Fa0/0 Objective: Establish an ISDN BRI to ISDN BRI call from a branch office to a central site. Scenario: The London network administrator