RE: [RPRWG] TDM or ATM/FR service emulation over RPR ring
Hi Yu Ning,
My comments are listed below.
-----Original Message-----
From: Yu Ning [mailto:yuning@xxxxxxxxxxxxxxx]
Sent: Wednesday, March 06, 2002 12:28 AM
To: Leon Bruckman
Cc: stds-802-17@xxxxxxxx
Subject: RE: [RPRWG] TDM or ATM/FR service emulation over RPR ring
Hi Leon,
Thanks for your timely reply, pls see my inline comment .
______________________________________
(Mr.) Yu Ning, Chief Engineer
ChinaNET (AS4134) Senior Support
Internet Dep. DCBU, China Telecom
Beijing, P.R.China +86-10-62072357
Personal Page-> http://navidog.126.com
______________________________________
|-----Original Message-----
|From: Leon Bruckman [mailto:leonb@xxxxxxxxxxxxx]
|Sent: Tuesday, March 05, 2002 5:20 PM
|To: 'Yu Ning'
|Cc: 'stds-802-17@xxxxxxxx'
|Subject: RE: [RPRWG] TDM or ATM/FR service emulation over RPR ring
|
|
|Hi Yu,
|RPR Standard defines a MAC and does not deal directly with how to transport
|the services. It provides Classes of Service that can be used to transport
|different services, but these classes are defined based on their
|characteristics (delay, delay variation,..) and not on the type of service.
|
|As for the specific way of transporting TDM/FR/ATM over packet networks I
|recommend you to look in the IETF PWE3 work.
|
Yes, thanks for your remindering. I've checked the charter of PWE3 WG, my
former question concerning encap. should be drafted there.
But it seems the detail draft with RPR as underlying transporting protocol
is
left empty now, possiblly due to the current pre-standard phase of RPR
itself.
PWE3 WG currently chooses only IP, L2TP, MPLS as transporting protocol.
So the current product like from Luminous, Riverstone is only proprietary
solution.
Vinay>>> Actually, that is not a accurate statement. RPR is a layer 2
technology
like any othe layer 2 technology. PWE3 draft is defining a mechanism to
provide
psuedo wires over a IP/MPLS networks. These IP/MPLS networks can be built
over any
layer 2 technology, like ATM, frame relay, Ethernet, Token ring, RPR and so
on..
As far as PWE3 is concerned, it is not defining or dictating what the layer
2
mechanisms are used. Whereas MEF (Metro Ethernet Forum) is trying to provide
similar services over a EtherMAC layer which again can be layered on top of
SONET, IP,
Frame relay, Ethernet and MPLS.
As far Luminous is concerned, I would not characterize it as a proprietary
solution,
rather a pre-standard implementation with the goal of RPR compliance as soon
as the
standard is officially formalized.
Thanks
Vinay