Re: Carrier supporting carrier: Why not L2VPN?

Thanks, Brian. That makes a lot of sense. Coincidentally, it was your SP
videos I've been watching all afternoon. I had just finished the three
Inter-AS options and was just starting the CSC section when I thought,
"What the heck?? Why would anyone do this on purpose?" lol

On Sat, Dec 29, 2012 at 8:23 PM, Brian McGahan <bmcgahan_at_ine.com> wrote:

> It is a corner case design. Most SPs would buy lambdas on someone else's
> DWDM network or MPLS L2VPN etc. Routing at layer 3 through another SP
> overcomplicates the design.
>
> It's the same as like Inter-AS MPLS L3VPN option C. Just because you
> *can* do it doesn't mean you *should* do it.
>
> Personally I've never seen any SP run option C, and I've seen many many
> large implementations. I'm sure it's out there and maybe someone here on
> the list has seen it but the amount of politics and interoperability that's
> needed between the providers is the limiting factor.
>
> From a technology standpoint CSC and option C L3VPN are more scalable than
> dark fiber or DWDM or L2VPN AToM or VPLS, but from an operational point of
> view a lot of time they're just not practical.
>
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security)
> bmcgahan_at_INE.com
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
> On Dec 29, 2012, at 8:00 PM, "John Neiberger" <jneiberger_at_gmail.com>
> wrote:
>
> > I'm watching some videos for the SP track and I just started one on CSC
> > using L3VPN. It seems awfully complicated. I haven't even really gotten
> > into the configuration of it yet, so maybe I'll be able to answer my own
> > question shortly, but why not just use L2VPN for this? It seems like you
> > could accomplish basically the same thing with MPLS pseudowires or
> > something like that. Or maybe even VPLS or whatever. Not sure about that
> > since I haven't done VPLS yet. :-)
> >
> > So, what's the deal? What advantage does CSC via L3VPN bring that would
> > make it worth all the configuration hassle?
> >
> > Heck, why not just run MPLS over GRE?
> >
> > I'll keep watching the video and reading about it. There is probably some
> > huge advantage that I am completely missing. I'm a noob to some of this,
> so
> > go easy on me. :)
> >
> > John
> >
> >
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Received on Sat Dec 29 2012 - 20:41:01 ART