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Basic Troubleshooting
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Use the undebug all or no debug all command to disable all debug functions
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EXERCISE 17-2 Using the Router s Troubleshooting Tools
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ON THE CD
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The last few sections dealt with the router s troubleshooting tools This exercise will help you reinforce this material You ll perform these steps using Boson s NetSim simulator You can find a picture of the network diagram for the simulator in the Introduction of this book After starting up the simulator, click the LabNavigator button Next, double-click Exercise 17-2 and click the Load Lab button This will load the lab configuration based on the exercises in s 11 and 16 1 Access the 2600-1 router in the simulator on the CD See what neighbors are directly connected to the router What is the IP address of the 2600-2 router At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 Use the show cdp neighbors command to view the 2600-1 s neighbors you may have to wait 60 seconds to see all the neighbors connected to this device (repeat the command as necessary) You should see one of the 2950 switches and the 2600-2 router Use the show cdp neighbors detail command to view the 2600-2 s address: it is 19216822 2 Access the 2950-2 switch in the simulator on the CD See what neighbors are directly connected to the router Which neighbors do you see What are their IP addresses At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-2 Use the show cdp neighbors command to view your neighbors You should see the 2950-1 switch and 2600-1 router You ll see the 2950-1 twice since there are two connections between these two switches Add the detail parameter to the preceding command to see the neighbors IP addresses
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17: IOS Device Management
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You should be more comfortable with the some of the router s troubleshooting tools
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INSIDE THE EXAM
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Router Configuration Files
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You should be intimately familiar with configuration files and when they are overwritten versus merged when using the copy command: re-examine Table 17-2 for an overview of this process configuration to allow SSH access into your IOS device, as well as how to disable the use of telnet on the VTYs
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Basic Troubleshooting
You should be able to determine what router commands you can use to troubleshoot problems at the various OSI Reference Model layers Know how CDP, including its timers, works and the kinds of information shared between directly connected Cisco devices Be able to display the CDP tables on an IOS device and understand their output Know how to troubleshoot layer 3 problems with ping and traceroute, starting with testing of the TCP/IP protocol stack on a user s computer Understand the different message responses you can see when using the ping command and what they mean from a troubleshooting perspective You should know how to configure your VTYs to allow telnet access, and be able to determine whether this is not set up correctly Remember how to suspend a telnet from an IOS device, resume it, and display your open sessions Know how to disable debug commands on your IOS device
Changes in Your Network
No Exam Watches are in this section: only practical knowledge you should always apply before making any changes on your IOS devices
IOS Image Files
You should be familiar with the commands to verify the files located in flash as well as what IOS image your device loaded from flash You need to understand how to upgrade your IOS with the copy command and know what happens during the upgrade, as well as how to determine whether the upgrade failed
Remote Access to Your IOS Device
You need to be able to compare telnet and SSH, and you should know how both are set up: review 11 for setting up your VTYs for telnet access Understand the basic
Certi cation Summary
CERTIFICATION SUMMARY
Use the copy commands to manipulate files, including configuration files and IOS images Any time you copy something into RAM, the IOS uses a merge process For any other location, the IOS uses an overwrite process On IOS devices, use the erase startup-config command to delete the startup-config file in NVRAM SSH should be used instead of telnet for remote terminal (CLI) access to the router since it encrypts traffic between your desktop and an IOS device CDP is a Cisco-proprietary protocol that functions at the data link layer Every 60 seconds, Cisco devices generate a multicast on each of their interfaces containing basic information about themselves, including the device type, the version of software they re running, and their IP address(es) To disable CDP globally, use the no cdp run command To see a list of your neighbors, use the show cdp neighbors command The ping and traceroute commands support an extended version at Privilege EXEC mode If you want to suspend an active telnet session, use the CTRL-SHIFT-6, X control sequence Pressing ENTER on a blank command line resumes the last suspended telnet session Use the resume command to resume a telnet connection Use the show sessions command to see your open telnet session Use the disconnect command to disconnect a suspended telnet session To disable debug on your IOS device, use undebug all or no debug all Debug functions only at Privilege EXEC mode
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