BGP routes into IGP

Posted in NETWORKING/IP ROUTING by edeguzman on September 29, 2007

This is the configuration that I’d done during in our laboratory regarding on Border Gateway Protocol (BGP). Basically this configuration will give you an BGP routes be a part of the IGP route. Of course this configuration is configured in the Border Gateway of Autonomous System (AS). Below is the configuration, I will try to explain every details of the configuration.

router eigrp 200
redistribute bgp metric 10000 100 255 1 1500
passive-interface Serial0/0
no auto-summary
router bgp 200
bgp log-neighbor-changes
network mask
neighbor remote-as 100

Within the AS 200, the EIGRP is the IGP that runs within the AS. The router BGP runs in the AS, You must be aware that this BGP is the one responsible for communicating inter-AS, although there are other ways to do the inter-AS communication but still the BGP is the best choice. Choices like redistribution is not good enough b’coz it provides alot deficiency just like route feedback. But I’m not going to promote BGP hehe it always still depends on the kind of networks you are running.

The redistribute bgp metric 10000 100 255 1 1500 in the EIGRP process is the key points in injecting BGP routes into an IGP. Basically, the routes in the BGPtable is being redistributed into the IGP tables. One important point to consider whendoing the redistribution is metric of the IGP being used in the domain. Just like in my configuration whereas I’d used the EIGRP as my IGP within the domain.

You need totake note of the metric of the routing protocols, like EIGRP wherein it uses bandwidth,delay, realibility, load and MTU that’s why bandwidth=10000, delay=100, realibility=255,load=1 and MTU=1500 in my configuration. To verify that routes from BGP is successfully injected to the IGP routes. Check the routing table of the routers within the AS and compare it to the BGP table in the border gateway.


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