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Re: [Detnet-dp-dt] New update of the draft available

Loa Andersson <loa@pi.nu> Sat, 11 March 2017 02:38 UTC

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From: Loa Andersson <loa@pi.nu>
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Date: Sat, 11 Mar 2017 10:38:11 +0800
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Subject: Re: [Detnet-dp-dt] New update of the draft available
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Jouni,

Mostly looks very good, the thing I don't understand is why you still 
say that the L-label is optional, it really isn't.

- we need it to deliver the d-pw label unchanged
- since we can't guarantee that the "P" nodes are not able to do
   DetNet NSP, we can't set up the d-pw label with signaling that
   exposes the "request for DetNet NSP/FRER" to P nodes.
- needed for protection
- the end-to-end tunnel must be the innermost tunnel, carrying
   pw label

There is one case, if two DA-*-PEs are immediately adjacent, there the
L-lable will be an implicit NULL label and not appear in the stack, but
for the control plane it is there.

/Loa

On 2017-03-11 07:25, Jouni Korhonen wrote:
> * Added Loa’s comments on the L-label.
> * Added Janos’ comments.
> * Added extended forwarder text.
> * Added (speculative text.. can be removed) D bit to flow-id word so that we can check in a ring case the direction of the flow (note this does not double history buffer space as claimed.. did not bother to fix that)
> * reworked the PW encapsulation pictures.
> * Added more content to DA-*-PE descriptions.
>
> - Jouni
>
>

-- 


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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