[20446] in North American Network Operators' Group
RE: IGPs in use
daemon@ATHENA.MIT.EDU (Thom Youngblood)
Tue Oct 13 14:53:06 1998
Reply-To: <thom@cais.net>
From: "Thom Youngblood" <thom@cais.net>
To: <nanog@merit.edu>
Date: Tue, 13 Oct 1998 14:14:21 -0400
In-Reply-To: <3.0.2.32.19981013130425.03b768f8@lint.cisco.com>
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> If BGP rides on TCP, how are the TCP sessions built if BGP itself is
used
> as the IGP?
This question should come after the next one.
> How does this affect the hierarchy of the network since all iBGP
speakers
> must be fully meshed?
You're assuming not only that it has to be fully meshed, but that each
router does not have a single hop distance to every other router.
You don't *have* to fully mesh it. You can use confederations, or you
can use route reflection. Or both, or some other method I didn't
think of.
Or, and this is more likely case, if you only have a few routers, and
each has a direct link to every other one, (Very likely with 2 or 3
routers), you can make a full mesh without problems.
As our network grew here, we used these methods to avoid an IGP until
we needed it. (Right now, we're using OSPF, if you're curious.)
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