[172291] in North American Network Operators' Group
Re: Getting pretty close to default IPv4 route maximum for 6500/7600
daemon@ATHENA.MIT.EDU (Jimmy Hess)
Wed Jun 11 05:07:51 2014
X-Original-To: nanog@nanog.org
In-Reply-To: <20140611062807.GA21771@pob.ytti.fi>
From: Jimmy Hess <mysidia@gmail.com>
Date: Wed, 11 Jun 2014 04:07:22 -0500
To: Saku Ytti <saku@ytti.fi>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Wed, Jun 11, 2014 at 1:28 AM, Saku Ytti <saku@ytti.fi> wrote:
> On (2014-06-10 12:39 -0500), Blake Hudson wrote:
> There is nothing to summarize away from global BGP table, if you have number
> showing less, it's probably counter bug or misinterpretation.
> Global BGP table, single BGP feed, will take same amount of RIB and FIB.
[snip]
That depends.... if by "summarize" they mean filter prefixes
longer than say /22, or otherwise...: discard extraneous prefixes
from networks that were allocated a /16 network but chose to
deaggregate and advertise every /24 ------ choosing to accept only
the /16 advertisement instead of installing these extra /24 routes in
the FIB, then there are plenty of entries to "summarize" away.
--
-JH
