Re: Draft on ISP broad-band deployment scenarios

[Salman Asadullah <sasad@cisco.com>]

Thanks for your feedback Gert.

We are working on the second version of our draft and integrating all the
feedback we have received.

Regards,
Salman


At 06:48 PM 10/7/2004 +0200, Gert Doering wrote:
> Hi,
>
> answering a specific bit out of this...
>
> On Fri, Sep 24, 2004 at 10:32:22AM +0300, Pekka Savola wrote:
> > > This is true but we have observed many of the BB ISPs are
> interested in 
> > > deploying native IPv6, driven by new services such as VoD using
> Multicast 
> > > and etc.  Some of the examples for these BB ISPs, who are
> deploying IPv6 
> > > are NTT in Japan, Spacenet in Germany, Dolphin in Switzerland,
> Nerim in 
> > > France, XS4ALL in The Netherlands and etc.
> > 
> > Sure.  But do these ISPs use a link-layer which supports
> multicast,
> > e.g., bridged-mode DSL (I think it does..)?
> > 
> > That is, if you do something like L2TPoE (which I think many are
> > doing), doesn't that require that multicast transmission be 
> > duplicated (on a lower layer) in any case, causing equal amount of
> > traffic as a tunneling based distribution?
>
> Our (SpaceNet's) DSL stuff is either PPPoE/L2TP based or
> ATM-PVC-based
> (bridged or routed mode).
>
> Neither has native support for Multicast (in the sense of "the
> network
> duplicates the packets"), so the benefits of multicasts are
> only
> in the uplink towards the DSL aggregation routers, and possibly if
> multiple users behind the same DSL line (small offices) are
> receiving
> the same multicast data stream.
>
> [..]
> > Extra investment is always possible, and many will certainly do it. 
> > The question is just how the ISPs would transition from
> "v4-only" to 
> > "v4+v6 natively".  My argument is that it would be easier
> for the ISPs 
> > to start with tunneling and native v6 where possible, than to
> require 
> > through-out upgrade to native v6.
>
> Full ACK here.  Some parts are just hard/expensive to get v6 on, 
> while others can be done fairly easily.  So you end up tunneling
> around those "difficult" bits, even if the rest of the network
> is
> already native.
>
> Gert Doering
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