BGP and aggregation
Ralph Doncaster
ralph at istop.com
Sat May 11 22:15:23 UTC 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
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