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Re: [Detnet-dp-dt] detnet LSPs and PWs

Jouni Korhonen <jouni.korhonen@broadcom.com> Mon, 13 February 2017 01:49 UTC

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From: Jouni Korhonen <jouni.korhonen@broadcom.com>
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Date: Sun, 12 Feb 2017 17:49:44 -0800
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To: Loa Andersson <loa@pi.nu>
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Subject: Re: [Detnet-dp-dt] detnet LSPs and PWs
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Thanks Loa bringing this up. I came to similar issue when writing down the draft text for T-PE, S-PE and forwarder descriptions. I did not think about having the d-pw go all way though (yet.. although that was part of the original Yokohama ‘proposal' in IETF 94 ;)

The excerpt from the Editor’s node in github text:

  <t>
   [Ed. Thinking of the DetNet label.. MAYBE we should just define a DetNet
   Control Word that keeps inside the e2e flow identification information what
   we now use the Detnet label for or change the ordering of the DetNet CW and
   the DetNet label. This would IMHO be a bit more cleaner approach - following
   the RFC5087 - and call it e.g., DetNet Adaptation Layer.  The current with
   DetNet label between the PW label and the CW does not seem to fit nicely
   into the existing PW architecture. On the other hand DetNet label could be used
   within the pipeline as an internal next-hop indicator.. I welcome discussion
   here..]
  </t>

- JOuni

--
Jouni Korhonen, Broadcom Ltd.
M: +1-408-391-7160

> On Feb 12, 2017, at 5:31 PM, Loa Andersson <loa@pi.nu> wrote:
> 
> Folks,
> 
> The mail from Yuanlong mmade me go back and check the PW architecture and consult with Andy Malis and Stewart Bryant. So I have one more thing
> that we should discuss on "Tuesday".
> 
> What Yaunlong said was: "IMHO, multiple layers of PW is a break from
> the PWE3 architecture, and all DP/CP/MP things will become more
> complicated."
> 
> It is correct that multi-layer pw's is problematic, though Andy said
> that "if you have a good use case, you can do it".
> 
> The problem is that there is a native service processing (NSP) at the end of the PW. Multi-layer PWs will only do NSP at one level. I think
> we should replace the MS-PW with an LSP. I've added one slide (9) and
> change slide 8,9 and 11 in the earlier package. The other slides arere
> for reference
> 
> I want Andy and Stewart to have a chance to review this prior to that
> we commit too hard to it. Copied them.
> 
> 
> /Loa
> -- 
> 
> 
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
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