The MPLS-OPS Archive

[fraanro <fraanro@arrakis.es>]

Luis, 
   I do not think there is any direct relationship between using an 
access technology (xDSL, Frame Relay, Ethernet, etc) and the fact that 
the service is a L2 VPN or a L3 VPN. You can have a L2 VPN with the 
customer connected through ADSL, Frame Relay or Ethernet, for example, 
and you can have a L3 VPN using all those access mechanisms (plus dial 
up which I do not think is possible today for L2 VPN).
   The access technology clearly defines the economics of a service and 
the final access rate is dependent on the requirements of the customer 
in terms of bandwidth, but I do not think there is any direct 
implication of the L2 or L3 VPN on which access technology should be 
available. There are some other economics related to L2 and L3 VPNs, 
but have nothing to do with the access media. 

   Hope this helps
   Javier.

----- Mensaje Original -----
Remitente: "Luis Manuel Antunes dos Santos" <luis-m-a-santos@telecom.pt>
Fecha: Martes, Marzo 23, 2004 6:19 pm
Asunto: RE: [MPLS-OPS]: Question about L2VPN over MPLS

> Dear Steinar, Roger, Javier and all,
> 
> Thanks for the inputs you provided;
> I agree I can re-formulate the question as follows:
> 
> What would be the minimum bitrate and what access technology, for 
> which it would make economic sense to deploy VPLS?  (as opposed 
> to, for instance, having more "traditional" L3 VPNs such as 
> BGP/MPLS or Virtual Router)
> 
> Thanks again,
> 
> Luís Santos
> DOP/SGR/TFS1
> ' 215002059
> * http://PC121765/cngr/grs4
> 
> 
> 
> -----Original Message-----
> From: Javier Perez LLedo [mailto:javi.pll@telefonica.net] 
> Sent: 23-03-2004 11:32
> To: 'Roger Clark Williams'; 'MPLS-ops Mailing List'
> Subject: RV: [MPLS-OPS]: Question about L2VPN over MPLS
> 
> 
> 
> Hi,
> 
> In general terms, I agree Roger. But, under my understanding, it 
> is not obvious the question in the case of VPLS. The risk, I've 
> observed is that a low speed for the service could impact in the 
> behaviour and performance of the applications over a LAN (local 
> broadcasts, response time, etc) when in fact aren´t in local 
> network, ;)
> 
> In the case of VPLS or EoMPLS, you should consider the apps the 
> users will run and their features, specially in you want to 
> provide a low speed between sites.
> 
> JAVI
> 
> -----Mensaje original-----
> De: Roger Clark Williams [mailto:rogerw@nordlink.com] 
> Enviado el: lunes, 22 de marzo de 2004 20:34
> Para: MPLS-ops Mailing List
> Asunto: Fwd: Re: [MPLS-OPS]: Question about L2VPN over MPLS
> 
> Luis,  Steinar is quite right, it depends. However, as an example, 
> I am 
> working now on a system that is using a GE-WAN interface from a 
> Cisco 7606 
> PE pointing towards the CEs. It will be configured as a Multi-VRF 
> interface, passing a number of streams of various customers' 
> traffic. How 
> fast the traffic may actually travel will be based on the Service 
> Level 
> Agreement between the individual customer and the provider, right 
> up to the 
> capacity of the entire physical interface. There is nothing 
> typical unless 
> the provider is selling services that replace present standard 
> telco 
> services, in which case maybe a "typical" speed might be 64k, 
> 128k, T1 or 
> the like. It would be controlled by something like the Cisco IOS 
> rate-limit 
> command or the policing command which limits the customer to a 
> given 
> throughput.
> 
> Roger Williams
> 
> 
> >X-Real-To: rogerw@nordlink.com
> >Resent-Date: Mon, 22 Mar 2004 14:01:22 -0500
> >X-Authentication-Warning: host.secure4-hosting.net: mplsrc12 set 
> sender 
> >to
> >mpls-ops-request@mplsrc.com using -f
> >To: luis-m-a-santos@telecom.pt
> >Cc: mpls-ops@mplsrc.com
> >Subject: Re: [MPLS-OPS]: Question about L2VPN over MPLS
> >From: sthaug@nethelp.no
> >X-Mailer: Mew version 1.05+ on Emacs 19.34.1
> >Date: Mon, 22 Mar 2004 19:47:18 +0100
> >Resent-From: mpls-ops@mplsrc.com
> >X-Mailing-List: <mpls-ops@mplsrc.com> archive/latest/6905
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> >
> > > Can anyone pls recommend one typical bit rate used between CE 
> and 
> > > PE, on implementations of the VPLS service (Layer 2 VPNs) ? 
> And the 
> > > technology of that Access?
> >
> >Why do you think there is such a thing as a typical bit rate 
> between CE 
> >and PE?
> >
> >The bit rate will normally be whatever the customer wants (and pays
> >for) - anything from 64 kbps to several Mbps. Similarly, there is 
> no 
> >one typical access technology for VPLS - DSL, traditional serial 
> lines 
> >and Ethernet are all examples of access technologies that can be 
> used.>
> >I think you need to reformulate your question.
> >
> >Steinar Haug, Nethelp consulting, sthaug@nethelp.no
> >
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