[47738] in North American Network Operators' Group
Re: BGP and aggregation
daemon@ATHENA.MIT.EDU (E.B. Dreger)
Sat May 11 17:59:11 2002
Date: Sat, 11 May 2002 21:58:51 +0000 (GMT)
From: "E.B. Dreger" <eddy+public+spam@noc.everquick.net>
To: Ralph Doncaster <ralph@istop.com>
Cc: nanog@merit.edu
In-Reply-To: <Pine.LNX.4.21.0205111728250.2247-100000@cpu1693.adsl.bellglobal.com>
Message-ID: <Pine.LNX.4.20.0205112152090.10575-100000@www.everquick.net>
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Errors-To: owner-nanog-outgoing@merit.edu
RD> Date: Sat, 11 May 2002 17:34:39 -0400 (EDT)
RD> From: Ralph Doncaster
RD> I have transit in 2 cities. I have a circuit connecting the
RD> 2 cities as well. So far I've been using non-contiguous IPs,
RD> so there's been no opportunity for aggregation. Having just
RD> received my /20 from ARIN, I'm trying to plan my network.
RD> Lets say I split the /20 into 2 /21's, one for each city.
RD> I'd like to announce the aggregate /20 instead of 2 /21's, as
RD> long as the circuit connecting the 2 cities is working. If
RD> the circuit goes down I want each city to announce the local
RD> /21. Is this possible? (using either a Cisco router or
RD> Zebra)
* BGP is an EGP, not an IGP
* You might want to check out OSPF if you think your net will
grow
* 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.
--
Eddy
Brotsman & Dreger, Inc. - EverQuick Internet Division
Phone: +1 (316) 794-8922 Wichita/(Inter)national
Phone: +1 (785) 865-5885 Lawrence
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