The MPLS WG Archive

[Curtis Villamizar <curtis@workhorse.fictitious.org>]

In message <39D2B5A4.239B0C17@alcatel.com>, "Kainia Cloutier" writes:
> 
> I'm currently in London, attending the MPLS Next Generation Networking
> conference. I came to this conference with one objective: finding out
> how to map an LSP to specific ATM switching hardware, while using
> RSVP-TE. For the last several weeks, I read RFCs 2205, 2210, 2212 and
> several IETF drafts and still couldn't find one paper describing "an
> edge LSR, sending a path message with these parameters set in the ADSPEC
> and FLOWSPEC object, will receive, from a downstream node,  an ATM CBR
> label mapping". (and so on and so forth for RT-VBR, NRT-VBR, UBR label
> mappings).


QoS is supported with the services defined in the diff-serv WG and to
the extent that diff-serv services such as EF, AF, etc can be mapped
onto ATM you have compatibility with the legacy ATM devices.

Apparently the experts you talked to failed to inform you that
draft-ietf-mpls-diff-ext-07 has gone through last call and will become
an RFC.  It maps LSPs onto services defined in diff-serv.  Mapping
these diff-serv services onto ATM is also defined, though three drop
preferences of AF doesn't map exactly to ATM and few ATM switches do
RED (probably none), but that may have been their shortsightedness.
[I can remember going to Fore in 1994 and telling them they needed to
forget this UBR, VBR, ABR stuff and do RED.]

Curtis

ps- There has been little or no effort to preserve what was regarded
as bad ideas and the ATM traffic management was regarded at the time
as one of those ATM bad ideas (and they still are regarded that way).