[133482] in North American Network Operators' Group
Re: Start accepting longer prefixes as IPv4 depletes?
daemon@ATHENA.MIT.EDU (Robert Bonomi)
Fri Dec 10 06:31:21 2010
Date: Fri, 10 Dec 2010 05:30:46 -0600 (CST)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
To: drc@virtualized.org, jbates@brightok.net
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> From nanog-bounces+bonomi=mail.r-bonomi.com@nanog.org Wed Dec 8 15:36:44 2010
> Date: Wed, 08 Dec 2010 15:34:47 -0600
> From: Jack Bates <jbates@brightok.net>
> To: David Conrad <drc@virtualized.org>
> Subject: Re: Start accepting longer prefixes as IPv4 depletes?
> Cc: NANOG list <nanog@nanog.org>
>
> On 12/8/2010 3:12 PM, David Conrad wrote:
> > Cameron,
> >
> > On Dec 8, 2010, at 12:01 PM, Cameron Byrne wrote:
> >> I believe a lot of folks think the routing paths should be tightly
> >> coupled with the physical topology.
> >
> > The downside, of course, being that if you change your location
> > within the physical topology, you have to renumber. Enterprises have
> > already voted with their feet that this isn't acceptable with IPv4
> > and they'll no doubt do the same with IPv6.
> >
> >> In a mature IPv6 world, that is sane, i am not sure what the real
> >> value of LISP is.
> >
> > Sanity is in the eye of the beholder. The advantage a LISP(-like)
> > scheme provides is a way of separating location from identity,
> > allowing for arbitrary topology change (and complexity in the form of
> > multi-homing) without affecting the identities of the systems on the
> > network. Changing providers or multi-homing would thus not result in
> > a renumbering event or pushing yet another prefix into the DFZ.
> >
>
> I think the issue, and correct me if I'm wrong, is that LISP does not
> address issues of traffic engineering? A lot of the additional routes in
> DFZ are there specifically to handle traffic engineering.
The primary thing that a LISP-like approach accomplishes is the 'de-coupling"
of infrastructure and leaf networks. You can mess with either one, w/o
having any effect on the other.
