Re: [Detnet-dp-dt] changes to document pushed & some questions...

Balázs Varga A <balazs.a.varga@ericsson.com> Mon, 26 June 2017 15:00 UTC

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From: Balázs Varga A <balazs.a.varga@ericsson.com>
To: Lou Berger <lberger@labn.net>, "Detnet-dp-dt@ietf.org" <Detnet-dp-dt@ietf.org>
Thread-Topic: [Detnet-dp-dt] changes to document pushed & some questions...
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Subject: Re: [Detnet-dp-dt] changes to document pushed & some questions...
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Hi,



I have reviewed all the changes. I am fine with almost all of them with the remarks below:



Figure4: In my view it should be the same figure as Figure 3, as DetNet End Systems are connected.

In this case the End Systems generate IPv6 packets with included seq-num and are connected to

Relay nodes, what results in no difference regarding the DetNet functionalities.

It would be a more interesting figure where IPv6 DetNet End Systems are connected

to an MPLS based DetNet domain, but it is similar from DetNet function perspective to Figure 2.

Let's list the possible combinations:

- We have three End System types: (1) TSN, (2) IPv6 and (3) MPLS-capable

- We have two PSN encapsulations: (1) IPv6 and (2) PWoMPLS

There are six possible combinations, however they result in 2 major variants from DetNet functions

perspective:

(1) End System type <> PSN type (TSN + IPv6, TSN + PWoMPLS, IPv6 + PWoMPLS, MPLS-capable + IPv6)

Edge node needed to ensure PSN specific encapsulation

(2) End System type = PSN type  (IPv6 + IPv6, MPLS-capable + PWoMPLS)

No need for Edge node as the encapsulation does not change.

(Note: I think we should treat "MPLS-capable + IPv6" as an invalid combination ... )

Figure 2 and Figure 3 are the representation of these two major variants. So do we really need Figure 4?



> 522       DetNet composite flow, perhaps even when both LSPs appear on the

522       DetNet compound flow, perhaps even when both LSPs appear on the



> doesn't the above (sec 5.2.2.) imply the PREF with IPv6 is always end-to-end, ...

I think this needs further discussion. The intention is to make PREF independent of domain borders and

domain encapsulations.



> 1033 7.4.  Bidirectional traffic

This chapter is very much MPLS focused, however the findings are also valid for IPv6. Should we make that

more clear?



Cheers

Bala'zs





-----Original Message-----
From: Detnet-dp-dt [mailto:detnet-dp-dt-bounces@ietf.org] On Behalf Of Lou Berger
Sent: 2017. június 21. 4:25
To: Detnet-dp-dt@ietf.org
Subject: [Detnet-dp-dt] changes to document pushed & some questions...



All,



I made a bunch of changes based on going though the document.  Most of the comments I discussed.  I put non-discussed ones in their own commits so it would be easier to eliminate them.  Changes are as follows:

    commit f79188034b23c80dab2985dc359176e93855376e

                Update txt to match change set

    commit 01a1798e4645518bb61acf42444b17466c3b56c1

                Make capitalization of section headings consistent.

                Not saying I agree with what's there, but now it's consistent.

    commit 27103f9af301d1a270ca7d6c9bd59a358dc9d1b0

                Revise CoS and QoS sections

    commit c98c0efda04c714db22a1cea6eefb77f04d10c4b

                General edits:

                    Fix some capitalization and minor nits

                    Add intro paragraph and pointer to arch doc, and basic scope of

                       document

                    Add not on why not using PW over IP

                    Add placeholder for IP native service figure (4)

                    Start clarification on congestion protection and latency control

                    Add some comments

    commit 5355f195f205d944d21d8242738fab0a6a8363ba

                Cleanup L-label and T-label language

    commit 78e937b1a25f07618b4b221140fc7fcfc2a43d02

       Move Time Sync into it's own section (new 8)

    commit 42bcb46dde2384cb4e3f76406780137086904bae

       Use arch defined terms DetNet compound flow and DetNet member flow





I also came up with following specific questions/comments, which are also captured in comments in the file:





WRT the title:



    <!-- LB: doesn't "Encapsulation" better fit the scope of the current

         document than "Solution"? -->

    <title abbrev="DetNet Data Plane Solution">



    WRT L-Label

    <!-- LB: why is this called L-Label, I think it'll be confused with

         the current DiffServ L-LSPs, perhaps a using "(S)vc" would be

         better and is aligned with Figure 12 of RFC5921  -->



  <!-- LB: unclear what the following means.  Perhaps restate or drop. -->

  However, transit nodes may have limited capabilities to recognize DetNet

  specific fields (e.g., in case of MPLS the PW label). Therefore, identifying each

  individual DetNet flow on a transit node may not be achieved in some network

  scenarios.



  in Section 5.2.1

    <!-- possibly reference new interworking considerations section -->



  In section 5.3.2

    <!-- LB: doesn't the above (sec 5.2.2.) imply the PREF with IPv6 is

         always end-to-end, or are you PREF domains with replication of

         incoming packets and scoped domain elimination? I think this

         should be explicitly discussed either way -->



I ran out of steam at the end, but this is enough -- I think...



Thanks,

Lou



PS given that I now have contributed text to the document, I should be added as a contributor (or author) but I didn't do this as there was no contributor section...



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