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BGP drawbacks?

We are considering using BGP in our organization. But I would like to find out what are the drawbacks of using BGP. We have 2 ISP and 3 T1 lines between the ISP's. BGP will mostly be used for fault tolerance and increase bandwidth. But what are the drawbacks of using BGP? line condition issue? delay? items like that besides being expensive. Thank you


Re: BGP drawbacks?

Not sure why you say that BGP is expensive. Here in the US, the only unavoidable cost (once you have the lines in place) is $500 for an Autonomous System Number. You don't need to run defaultless to get the fault tolerance benefits of BGP, you can do the job with a 2610 or 1705 router (although the 1705 will probably need to be upgraded to IP-plus feature set to get BGP).

You only need lots of memory and CPU cycles if you run defaultless, and there are few benefits to that (other than prestige) unless your ISPs have significantly different connectivity.

There are plenty of articles around on setting up BGP. There is a very brief, high level overview of all your options in the Multihoming white paper on my web site. You do want to spend the time to do it right, because mistakes can make you unpopular with your ISP or cause your router to crash (or if your ISP is lazy or incompetent and doesn't filter your advertisements, you could even make a mess of the Internet!).

Good luck and have fun!

Vincent C Jones