By James Boney
Cisco routers are available all sizes and styles and just about all of them, from the smallest to the biggest, run the IOS working procedure. IOS is a very robust and complicated working approach, with an equivalently complicated configuration language. there are various instructions, with many strategies, and if something is configured incorrectly, the total corporation may well locate itself offline. Cisco IOS in a Nutshell covers IOS configuration for the TCP/IP protocol kin. The publication is split into components: the 1st contains chapters at the consumer interface, configuring traces and interfaces, entry lists, routing protocols, and dial-on-demand routing and safety. the second one half is a vintage O'Reilly-style speedy connection with the entire instructions it's essential to paintings with TCP/IP, together with the lower-level protocols on which it is predicated, and plenty of examples of the main as a rule encountered configuration steps for the routers themselves.
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Extra resources for Cisco IOS in a Nutshell: A Desktop Quick Reference for IOS on IP Networks
Ftp FTP server. null Bit bucket; files copied to a null destination are discarded. The null prefix is useful for testing connectivity and determining file size. nvram Nonvolatile memory. rcp RCP server. slot0 First PCMCIA flash memory card. slot1 Second PCMCIA flash memory card. system Volatile system memory. Often used for access to the currently running system configuration. tftp TFTP server. You can view and copy files on remote servers using the TFTP, RCP, and FTP protocols, but you cannot delete files from them.
To upload a new image, use the same five-step process outlined in the previous section, but replace tftp with rcp in the copy commands. For example, in Step 2, use the command: Router#copy flash rcp Be aware that many sites consider the remote shell protocols a security problem and disable them. You can also run RCP from your Unix workstation. rhosts file. 2 Using the IOS Filesystem for Images The upgrade procedure described in the previous sections is for a Class B IOS filesystem. Class B filesystems are probably the most common, but they aren't universal—particularly on high-end routers.
5. 6. 7. 8. 9. 10. 1 Configuration Soapbox Managing a handful of routers quickly becomes a large task, and managing thousands of routers is even worse. You can minimize your administrative burden by configuring your routers carefully, completely, and consistently. I strongly recommend that you use every helpful item possible—even if the configuration item is not required. Every moment spent doing configuration groundwork translates into many hours saved when you are troubleshooting or performing maintenance tasks.