The Journey of a Network Engineer

Nov 7 2011   4:35AM GMT

How to filter routes in RIP?

Sulaiman Syed Profile: Sulaiman Syed

Filtering routes in RIP

Although rip is not the best routing protocols, the mechanism of filtering routes can be applied to other routing protocols a well. My personal advice will be to stay away as much as possible from RIP. RIP is a routing loop magnet, you never know when you created a loop by yourself.

In this entry, I would like to mention two methods that i found interesting, cause it will be helpful even in later as we go on. Lets read the syntax below

Router rip
distribute-list 100 in serial 1/0
access-list 100 deny ip host host
access-list 100 permit ip any any

in the rip process i have included a distribute-list. This list has to statements. The second one to permit all route updates to be installed in the routing table that are coming from Interface Serial 1/0. The first access list deny route to network which is advertised by

Keep in mind that distribute-list can be used with BGP and it has different meaning! so lets summarize this

access list 100 deny ip host x.x.x.x (router) host y.y.y.y (Network) ————- IN IGB
access list 100 deny ip host x.x.x.x (network) host y.y.y.y (mask) ————– IN BGP

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