Wednesday, April 17, 2013

Redistribute Routing Methods

Change a routing protocol from one type to another by redistribution.


A routing protocol takes an IP packet and sends it to remote networks. There are different ways of connecting one network to another, for example, using static routes, RIP, OSPF and Eigrp, to name a few. Redistribution is using a routing protocol to advertise (publish) routes that are originated by different means. Running a single routing protocol throughout your entire IP network is desirable, but multi-protocol routing is common. To make redistribution possible, it is important to understand and account for differences in routing protocol characteristics. Differences such as administrative distance, metrics, classful and classless capabilities can effect redistribution.


Instructions


1. Type "enable" to enter the router's privilege mode. In this mode, the command editor automatically launches and you can enter all commands or modify them. Think of a "mode" as a floor in a building. In the "ground floor" you can do certain things, but to do others, you have to go to a higher floor.


2. Type "config t" to enter the global configuration mode. This mode allows you to make modifications that are not available in privileged mode. Next type "router RIP". This command allows you to configure the RIP protocol.


3. Type "redistribute static", "redistribute ospf 1" and "default-metric 1". Here you have told the static route and ospf to convert its routing information into RIP.


4. Type "router eigrp 1" followed by "network 148.18.0.0". Type the redistribution commands "redistribute static", "redistribute ospf 1", "redistribute rip", followed by "default'metric 10000 100 255 1 1500". This sequence of commands will redistribute a static route, also ospf and rip, into eigrp. The default-metric command makes the redistribution possible because eigrp uses a metric of bandwidth, delay, reliability, load and maximum transmission unit (MTU). You must account for these metrics in the conversion.








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