[193384] in North American Network Operators' Group
Re: BGP Route Reflector - Route Server, Router, etc
daemon@ATHENA.MIT.EDU (Brandon Ewing)
Fri Jan 13 17:39:37 2017
X-Original-To: nanog@nanog.org
Date: Fri, 13 Jan 2017 16:39:34 -0600
From: Brandon Ewing <nicotine@warningg.com>
To: Justin Krejci <JKrejci@usinternet.com>
Mail-Followup-To: Justin Krejci <JKrejci@usinternet.com>, nanog@nanog.org
In-Reply-To: <3E9C67DA261AC349B60FF3609F5E211D7D80357D@USI-2K10EX02-MT.usicorp.usinternet.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
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On Thu, Jan 12, 2017 at 08:32:44PM +0000, Justin Krejci wrote:
> What are the pros and cons of one design over another? On list or private=
off list replies would be great; I'd welcome real world experiences (espec=
ially any big gotchas or caveats people learned the hard way) as well as ju=
st links to previous discussions, PDFs, slideshows, etc. Heck even a good b=
ook suggestion that covers this topic would be appreciated.
>=20
One important thing to remember when migrating from full mesh to a RR design
is that you are reducing information available to the routers in the ASN.
When you had a full mesh, each router could select the best path from all
available paths, according to its position in the IGP. In a RR environment,
by default, routers only have available to them the best routes from the
RR's position in the IGP, which can lead to suboptimal exits being selected.
Work is being done to allow RRs to compute metrics from the client's
position in the IGP: See
https://tools.ietf.org/html/draft-ietf-idr-bgp-optimal-route-reflection-13
for more information
--=20
Brandon Ewing (nicotine@warningg.com)
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