RE: IGPs in use

["Thom Youngblood" <thom () cais net>]

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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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