By Inc. Cisco Systems

Should you can examine the matter, Internetworking Troubleshooting guide most likely has the answer - a minimum of by way of networking difficulties. This 714-page tome is admittedly extra special in scope. even though you'll now not locate in-depth scholarly discussions of networking woes, you can find pragmatic assistance which may assist you via an instantaneous trouble. And the configuration monitors, tables, and diagrams are either crucial and priceless additions to the text.Divided into six sections, the 1st outlines basic problem-solving innovations in addition to to be had troubleshooting instruments from Cisco and third-party proprietors. subsequent, the authors cope with undefined, booting, and media (which basically capacity solutions as to what might be fighting the community routers or switches from immediately firing up). moreover, power Ethernet, FDDI (Fiber dispensed information Interface), and Token Ring malfunctions are greater than sufficiently addressed.The seven chapters of part three deal solely with routing protocols from TCP/IP to AppleTalk to the extra imprecise Banyan VINES. As for WAN connectivity, greater than a hundred pages are devoted to serial line, dial-in, ISDN, body relay, and X.25 connections. And in case you are experiencing trouble on your ATM or LAN switching setting, along with your defense servers, or with CiscoWorks, this workforce of authors has supplied necessary counsel for these concerns besides. The 5 appendices - "Creating center Dumps," "Memory Maps," "Technical help Information," "References and suggested Reading," and "Troubleshooting Worksheets" - also are important.

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The initialization process will vary depending on the type of boot server. conf file. If the TFTP server is not included in this file, add the appropriate line and cause inetd to reload its configuration. Router image is in the wrong directory 1. Look at the server configuration file to see whether it points to the directory in which the router image is located. 2. Move the router image to the correct directory, if necessary. 3. Make sure that the /tftpboot directory is reachable over the network.

The router enters setup mode. 5. Press Ctrl-C to bypass the setup. 6. Enter the configure memory privileged exec command. 7. Obtain an uncompressed system image. From the router prompt, use the privileged exec command copy flash tftp to send the compressed image back to the TFTP1 server. Decompress the image at the TFTP server. This cannot be done at the router. 8. Use the copy tftp flash privileged exec command at the router to retrieve the uncompressed image. The following is an example of the use of the copy tftp flash command: router# copy flash tftp filename continues Internetworking Troubleshooting Handbook, Second Edition 3-28 1-58705-005-6 Chapter 3 Troubleshooting Hardware and Booting Problems Troubleshooting Booting Problems Table 3-8 Booting: Vector Error Occurs When Booting from Flash Memory (continued) Possible Problem Solution Compressed system image (continued) The router asks you for the IP address of the TFTP server and the name of the image file that you are copying to the server.

For information about configuration register settings, refer to your hardware installation and maintenance documentation. 2. Power-cycle the router. 3. Within the first 60 seconds of booting, press the Break key to access the ROM monitor. 4. At the ROM monitor prompt (>), enter o/r 0x1 to set the configuration register to boot from ROM. 5. Enter i to reinitialize the router, which causes the router to enter setup mode. 6. Obtain the correct system image. If necessary, contact your technical support representative to determine which image is correct.

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