By Kevin Dooley, Ian Brown
By no means has anything cried out for a cookbook particularly up to Cisco's Internetwork working method (IOS). IOS is strong and versatile, but in addition complicated and daunting. so much projects could be finished in numerous alternative ways. and also you don't need to spend priceless time knowing which approach is better if you find yourself attempting to resolve an issue speedy. that is what this cookbook is for. thankfully, such a lot router configuration initiatives should be damaged down into a number of roughly self sustaining steps: you configure an interface, you configure a routing protocol, you put up backup hyperlinks, you enforce packet filters and different entry keep an eye on mechanisms. What you really want is a suite of recipes that help you practice the commonest initiatives, so that you can speedy get a hold of an excellent configuration on your web site. and also you want to know that those recommendations paintings: you do not need to discover your self imposing a backup hyperlink at 2 A.M. simply because your major hyperlink is down and the backup hyperlink you place up in case you put in the router wasn't rather right.Thoroughly revised and improved, Cisco IOS Cookbook, second variation, provides sections on MPLS, defense, IPv6, and IP Mobility, and provides options to the most typical configuration difficulties, including:Configuring interfaces of many sorts, from serial to ATM and body Relay Configuring the entire universal IP routing protocols (RIP, EIGRP, OSPF, and BGP) Configuring authentication Configuring different prone, together with DHCP and NTP developing backup hyperlinks, and utilizing HSRP to configure backup routers dealing with the router, together with SNMP and different recommendations utilizing entry lists to regulate the site visitors throughout the routerIf you're employed with Cisco routers, you would like a booklet like this that can assist you clear up difficulties speedy and successfully. no matter if you are skilled, the ideas and vast reasons provides you with new principles and insights into router configuration. And in case you are now not experienced--if you've got simply been given accountability for dealing with a community with Cisco routers--this e-book can be a job-saver.
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Additional resources for Cisco IOS Cookbook, 2nd Edition (Cookbooks (O'Reilly))
If you do have problems with the boot system command, connect to the console and reload the router. This will display any error messages as the router boots. The router does not capture these messages anywhere, so this is the only way to see them. 3(4)T, Cisco introduced the concept of boot markers. Essentially, all boot system command lines are now placed between two permanent boot markers located within the configuration file. These markers cannot be erased and make locating the boot system commands easy.
On Unix systems, you can use the chmod command to change the file attributes. This will ensure that the file isn’t accidentally overwritten. Unlike configuration files, which you should never store in your TFTP directory, IOS images pose no security concerns, as long as they are not world writeable. 10 Copying an IOS Image Through the Console Problem You want to load an IOS image into your router through a serial connection to the console or AUX ports. Solution You can use the following set of commands to copy an IOS image onto a router through either the console or the AUX port: Router1#copy xmodem: slot1: **** WARNING **** x/ymodem is a slow transfer protocol limited to the current speed settings of the auxiliary/console ports.
If we had reversed the order of these commands, the router would have tried first to boot from flash, and would have resorted to TFTP if the router had trouble with the file on the flash. For redundancy purposes, you can configure the router to boot from multiple TFTP servers. Simply copy the same IOS image to an alternate set of TFTP servers and include a boot system command per server. This reduces the dependency of the router to a single TFTP server, although the router has to try each successive server and time out before moving on to the next one, which can increase the boot time.
Cisco IOS Cookbook, 2nd Edition (Cookbooks (O'Reilly)) by Kevin Dooley, Ian Brown