Option A (B2B VRF) doesn't really scale in real life unless you're only doing a few of them.
I'd say Option B is commonly used although I'm not aware of an official study. You're explicitly trusting the other side to send you the right stuff though as you cannot filter based on label in IOS (last I checked). No such problems with option A. Kaj > From: Bryan Bartik <[email protected]> > Date: Wed, 9 Sep 2009 08:38:18 -0700 > To: Jo Knight <[email protected]> > Cc: <[email protected]>, Francisco <[email protected]>, > <[email protected]> > Subject: Re: [OSL | CCIE_SP] Inter-AS VPN Option B and send-label > > > I don't know that there is a normal one! As far as ease of configuration B2B > VRF is the easiest, everything else is some form of External MP-BGP (with > options for send-label, multi-hop, next-hop-self).
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