The MPLS WG Archive

["Donkin, Richard" <rdonkin@orchestream.com>]

> -----Original Message-----
> From: Geoff Bennett [mailto:geoff.bennett@marconi.com]
> Sent: 18 April 2001 11:15
> To: MP LS; mpls-ops@mplsrc.com; mpls@uu.net
> Subject: Re: ATM-LSR do they use OSPF/IS-IS or PNNI??
> 
> 
> Hi Niels,
> 
> There may be some confusion arising depending on how you 
> configure the ATM
> switch.  In effect there are three modes of operation for 
> this device...
> 
> 3.  Ships in the Night (SIN).  In this case, both ATM and MPLS Control
> Planes operate simultaneously.  ATM signalling happens on VCI 
> 5, and MPLS
> signalling on VCI 32.  VCs that are set up as a result of 
> signalling are
> "owned" by one or other of these control planes.   SIN would allow an
> operator to continue to run high revenue voice services (and 
> maybe existing
> Frame Relay or native ATM services...they make money too)  
> over the ATM
> "character" of the switch.  They can then run the loss-making Internet
                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> services over the MPLS character.
^^^^^^^^^^

Very amusing... I'm sure this was just flame-bait, but first of all, MPLS
supports IP services, not just Internet traffic, and you can of course run
highly profitable IP VPN services over MPLS.

Ultimately, ATM/FR services (as seen by the customer) may well be carried
over an MPLS core, particularly as MPLS becomes one of the key signalling
mechanisms for all-optical core networks, but since much of the traffic
running over ATM/FR is actually IP, it may be simpler to deliver IP VPNs
directly to the customer premises. 

> Cheers,
> Geoff

Richard Donkin
T: +44 (0)20 7348 1507
Orchestream
Avon House, Kensington Village, Avonmore Road, London W14 8TS
T: +44 (0)20 7348 1500 F: +44 (0)20 7348 1501
www.orchestream.com


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