North American Network Operators Group
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Re: BGP and aggregation

  • From: Ralph Doncaster
  • Date: Sat May 11 18:17:11 2002 
> * BGP is an EGP, not an IGP
> * You might want to check out OSPF if you think your net will
>   grow
Using iBGP between the 2 cities right now.  May try OSPF later.

> * You don't want your IGP influencing your EGP.  Flap, flap.
> * Redistributing EGP into IGP isn't exactly good, either.
> 
> Are the upstreams the same in each city?  Why not announce the
> aggregate /20 normally, and set NO_REDISTRIBUTE and use MEDs on
> the /21s?  You're paying for transit, so MEDs are fair game.

Well, the assumption is that most of the time the circuit between the 2
cities will be up, so flapping should be rare.  The transit is from
different providers, so only announcing the /20 won't do the trick.

-Ralph