[57703] in North American Network Operators' Group
Re: [Re: selective auto-aggregation]
daemon@ATHENA.MIT.EDU (Jack Bates)
Fri Apr 18 11:24:46 2003
Date: Fri, 18 Apr 2003 10:24:21 -0500
From: Jack Bates <jbates@brightok.net>
To: Joshua Smith <joshua.ej.smith@usa.net>
Cc: nanog@merit.edu
In-Reply-To: <659HDRozY9968S01.1050677510@uwdvg001.cms.usa.net>
Errors-To: owner-nanog-outgoing@merit.edu
Joshua Smith wrote:
> i have been told that it is that way for 'backup' purposes (they
> announce one or two /2[456]s to me with about 15 as prepends, and
> announce their entire /20, plus all of their longer prefixes, to another
> provider)
> they also told me that it will not be changed...apparently, as routers
> get more powerful and memory gets 'cheaper', they feel that it is not
> their responsibility to help maintain global routing table sizes
>
That's just beyond me. Since local preference is chosen before AS hop
count, providers that are setup right allow for easily crafting your
routing. I run an AS prepend out Sprint with default LP, which allows
any packet that makes it to their network to come strait to me, but
anyone that is multi-homed or exterior will probably go out another way.
I work with communities to make routing symetrical as possible (not
perfect, but close). Then I shoot out my aggregates via Qwest untouched
and it's smooth sailing with a backup.
Then again, when dealing with various providers over the years, I've
gotten some funny looks when I start talking communities and the need
for symetrical routing.
-Jack
