IP Routing Primer (Networking Technology) by Robert Wright

By Robert Wright

A radical advisor to realizing IP habit in a router-based networkLearn IP habit in a Cisco router-based community from an expertExamine confirmed, potent troubleshooting innovations to do away with the necessity for extra technical supportMaster IP basics that everybody helping an IP community must knowStudy visible causes of complicated real-world eventualities IP Routing Primer makes a speciality of how IP routing behaves in a Cisco router surroundings and in addition exhibits how one can use Cisco routers as a studying instrument. as well as instructing the middle basics, this publication complements your skill to troubleshoot IP routing difficulties your self, frequently casting off the necessity to demand extra technical help. In circumstances the place extra help is needed, this ebook can help you're employed extra successfully with customer service engineers through bettering your skill to explain difficulties correctly.The details is gifted in an approachable, workbook-type structure with dozens of targeted illustrations and genuine lifestyles eventualities built-in all through.

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Extra info for IP Routing Primer (Networking Technology)

Sample text

The following example, which uses the show ip protocol command at the command prompt of RouterA, shows the default timers used by RIP. These are the timers that a Cisco router uses to control the way RIP reacts to changes in its routing table. It is possible to override these defaults by using the timers basic command. See the Cisco command reference for the version of IOS you are using for more information on this command. Note The timers basic command should be used with caution. Inappropriate use of this command can have a catastrophic effect on the IP routing functionality of your router.

Any router connected to the same network can be used to investigate what the problem is and possibly resolve it. It could be something like an Ethernet segment with excessive collisions that is constantly resetting or a beaconing Token Ring segment. The traceroute command is available on Cisco routers and most other hosts that use TCP/IP. 0 command from RouterA would end up at RouterC using the path via RouterB after RouterA had converged on the new path. An investigation of RouterC would have turned up the fact that someone had configured an access list against RIP.

If it is used on an active route (one that is not in holddown), temporary connectivity loss can occur. It is best to experiment with this command in a lab environment to understand how it will affect IP connectivity before using it in a live environment. Note The administrator can also use the traceroute command to find a router that has a connection to the network that is in holddown. Depending on the topology of the network and the status of the routing tables in the routers that the traceroute command encounters, it may actually end up at the router that was advertising the route that has gone into holddown.

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