Subject: Re: MPLS based DSLAMs

From: Telecom Tom <[email-masked]>
Date: Wed, 19 Jan 2000 17:31:58 -0500

Antti,

Instead of MPLS-based DSLAMs, could we have MPLS-based DSLARs (DSL
access routers)? If so, could these be used as iPOPs (Internet POPs)
for direct connections between the customer premises and transit ISPs,
doing away with local/access ISPs? The old and new models look like
this:

Old model with local/access ISP
-------------------------------

Cust  <-> ILEC <-> access <-> ILEC <-> transit <-> Internet
prem       CO       ISP        CO      ISP POP      cloud

New model without local/access ISP
----------------------------------

Cust  <-> LEC <-> iPOP <-> Internet
prem      CO                cloud

So at the ILEC CO or CLEC wire center/headend, the new model would put
an MPLS-based DSLAR to route traffic between the end customer and the
Internet. The access ISP, er, goes on a long vacation, or better,
evolves to something else like a CLEC or server-farm operator offering
VoD and thin-client applications.

So is this DSLAR/iPOP a realistic application of MPLS that supports
end-to-end QoS and usage reporting/charging?

--Regards, TT
------------------------------------------------
Tom Nelson Scott         [email-masked]
The Veda Home Company    Bowling Green, Ohio USA
"In IP We Trust"         "E Pluribus Unix"
------------------------------------------------

-------- Original Message --------
Subject: MPLS based DSLAMs
Date: Tue, 11 Jan 2000 17:18:47 -0500
From: "Antti Kankkunen" <[email-masked]>
Reply-To: "Voice Over MPLS" <[email-masked]>
To: "Voice Over MPLS" <[email-masked]>
CC: <[email-masked]>, <[email-masked]>,
<[email-masked]>

Thomas and others,

a related comment below.

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]]On Behalf Of Thomas
> Wolfram
> Sent: Saturday, January 08, 2000 7:05 AM
> To: [email-masked]; [email-masked]
> Subject: RE: prime time MPLS/fiber
>

> But I think if you would want to use framed MPLS to replace
> cell ATM in an xDSL access network extending MPLS to the CPE
> could make sense. There the CPE isn't connected directly to the
> operator LSR having all the internet routes anyway. Perhaps
> several hundred CPEs are connected to DSLAMs and you have
> perhaps the LERs of several ISPs connected to the PoP. You
> could also have other service gateways connected to the
> PoP. All these ISP LERs route into the internet, i.e. to the
> same set of destinations. You wouldn't use MPLS on the local
> loop to pre-label the packets for transport through the core
> network but through the access network. By using different labels
> the customer could even choose to send different traffic to
> the same destination via different ISPs though he has only
> one physical xDSL link.
> I.e. I think you could use MPLS for the same purpose ATM is
> used in the access networks today.
>

There is already some effort in progress to address the kinds of
applications
you describe above.

In their Paris meeting early February, the DSL Forum will hold a BOF
session on
MPLS and its relevance to the DSL/DSLAM architectures being addressed
in the DSL
Forum set of recommendations. Please see
http://www.adsl.com/adsl_forum.html (Click on Meetings & Events /
Meeting
Information)

You need to be a DSL Forum member to attend the BOF session. The
session is held
on the evening of either 2/9 or 2/10.

Below please find a quote from an e-mail from Greg Wetzel of Covad
describing
the BOF session.

===Beginning of quote from Greg Wetzel==
The technical committee chair, Gavin Young, agreed just last week to
hold a
BoF on MPLS at the technical committee meeting in Paris.  It will be
chaired
by Martin Jackson, a member of the DSL Forum board of directors.  The
BoF
will be either Wed or Thu evening from 5:30-7:30pm.  An agenda will be
forthcoming shortly, but will include a 45 min MPLS tutorial from
David
Allan, Nortel, chair of the Architecture Working Group, and an hour on
the
discussion of how MPLS fits into the DSL Forum set of recommendations.
===End of quote====================

Best regards,

Antti K.

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