[Teas] FW: New Version Notification for draft-lee-teas-actn-pm-telemetry-autonomics-17.txt

Leeyoung <leeyoung@huawei.com> Wed, 08 May 2019 16:50 UTC

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From: Leeyoung <leeyoung@huawei.com>
To: TEAS WG <teas@ietf.org>
Thread-Topic: New Version Notification for draft-lee-teas-actn-pm-telemetry-autonomics-17.txt
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Date: Wed, 8 May 2019 16:50:38 +0000
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Subject: [Teas] FW: New Version Notification for draft-lee-teas-actn-pm-telemetry-autonomics-17.txt
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Hi, 

This revision incorporated Dieter's comments (exchanged privately --- see the attachment for this content of Dieter's comments). 

If there are still further comments before being ready for WG adoption, we'd appreciate your providing comments in a timely manner.  

Thanks & Best regards,
Young (on behalf of co-authors)

-----Original Message-----
From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] 
Sent: Wednesday, May 8, 2019 11:43 AM
To: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>;; Satish Karunanithi <satish.karunanithi@gmail.com>;; Leeyoung <leeyoung@huawei.com>;; Dhruv Dhody <dhruv.dhody@huawei.com>;; Daniel King <d.king@lancaster.ac.uk>;; Ricard Vilata <ricard.vilalta@cttc.es>;; Ricard Vilalta <ricard.vilalta@cttc.es>;
Subject: New Version Notification for draft-lee-teas-actn-pm-telemetry-autonomics-17.txt


A new version of I-D, draft-lee-teas-actn-pm-telemetry-autonomics-17.txt
has been successfully submitted by Young Lee and posted to the IETF repository.

Name:		draft-lee-teas-actn-pm-telemetry-autonomics
Revision:	17
Title:		YANG models for VN & TE Performance Monitoring Telemetry and Scaling Intent Autonomics
Document date:	2019-05-08
Group:		Individual Submission
Pages:		30
URL:            https://www.ietf.org/internet-drafts/draft-lee-teas-actn-pm-telemetry-autonomics-17.txt
Status:         https://datatracker.ietf.org/doc/draft-lee-teas-actn-pm-telemetry-autonomics/
Htmlized:       https://tools.ietf.org/html/draft-lee-teas-actn-pm-telemetry-autonomics-17
Htmlized:       https://datatracker.ietf.org/doc/html/draft-lee-teas-actn-pm-telemetry-autonomics
Diff:           https://www.ietf.org/rfcdiff?url2=draft-lee-teas-actn-pm-telemetry-autonomics-17

Abstract:
   This document provides YANG data models that describe performance
   monitoring telemetry and scaling intent mechanism for TE-tunnels and
   Virtual Networks (VN).

   The models presented in this draft allow customers to subscribe to
   and monitor their key performance data of their interest on the
   level of TE-tunnel or VN. The models also provide customers with the
   ability to program autonomic scaling intent mechanism on the level
   of TE-tunnel as well as VN.



                                                                                  


Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat

--- Begin Message ---
Hi Young,

here are some more comments as promised:

Other terms which are not defined are:


*       scaling intent (the description in section 4 is very poor and does not describe what scaling intent is all about),

*       network autonomics



The term performance monitoring (PM) is being used in transport networks for many years and typically relates to 15min/24h PM counters and PM history.
Streaming telemetry data is rather new for transport network equipment and care should be taken to distinguish streaming telemetry data  from classical PM data
unless the classical PM counters are streamed, which is also an option.

Regarding the scaling intent: I was expecting to find a description of "scaling intent" in order to understand what it means:



      Scaling intent configuration mechanism allows the client to
      configure automatic scale-in and scale-out mechanisms on both the
      TE-tunnel and the VN level. Various conditions can be set for auto-
      scaling based on the PM telemetry data.


   What are the "automatic scale-in and scale-out mechanisms"? What are the configuration parameters of these mechanisms? This is totally unclear to me:


      There are a number of parameters involved in the mechanism:

        . scale-out-intent or scale-in-intent: whether to scale-out or
           scale-in.


   The tree view in section 4 is not providing any clarity either:


      module: ietf-te-kpi-telemetry
        augment /te:te/te:tunnels/te:tunnel:
          +-rw te-scaling-intent
          |  +-rw scale-in-intent
          |  |  +-rw threshold-time?            uint32
          |  |  +-rw cooldown-time?             uint32
          |  |  +-rw scale-in-operation-type?   scaling-criteria-operation
          |  |  +-rw scaling-condition* [performance-type]
          |  |     +-rw performance-type           identityref
          |  |     +-rw threshold-value?           string
          |  |     +-rw te-telemetry-tunnel-ref?
                      -> /te:te/tunnels/tunnel/name
          |  +-rw scale-out-intent
          |     +-rw threshold-time?             uint32
          |     +-rw cooldown-time?              uint32
          |     +-rw scale-out-operation-type?   scaling-criteria-operation
          |     +-rw scaling-condition* [performance-type]
          |        +-rw performance-type           identityref
          |        +-rw threshold-value?           string
          |        +-rw te-telemetry-tunnel-ref?
                      -> /te:te/tunnels/tunnel/name


   The meaning of the attributes (e.g. cooldown-time, scale-in-operation-type) are not explained.


   My conclusion: this document is not ready yet for WG adoption. The concerns I raised at IETF104 wer not properly addressed.


   Thanks,
   Dieter




   On 18.04.2019 20:58, Dieter Beller wrote:


   Hi Young,

   here is my very first comment:

   The abstract reads:


      Abstract

         This document provides YANG data models that describe performance
         monitoring telemetry and scaling intent mechanism for TE-tunnels and
         Virtual Networks (VN).

         The models presented in this draft allow customers to subscribe to
         and monitor their key performance data of their interest on the
         level of TE-tunnel or VN. The models also provide customers with the
         ability to program autonomic scaling intent mechanism on the level
         of TE-tunnel as well as VN.

   When I tried to find the definition of the term "key performance data" I failed. The terminology section reads:





      1.1. Terminology

         Refer to [RFC8453<https://tools.ietf.org/html/rfc8453>;], [RFC7926<https://tools.ietf.org/html/rfc7926>;], and [RFC8309<https://tools.ietf.org/html/rfc8309>;] for the key terms used
         in this document.


   The term "key performance data" is not defined in section 1.1 nor in the referenced RFSs!
   Frankly speaking, I have no clue what "key performance data" is.

   This is what I was criticizing when you presented the draft in Prague.

   More comments will follow.


   Thanks,
   Dieter




   On 18.04.2019 18:56, Dieter Beller wrote:


      Hi Young,

      I will have a look at the latest version. Unfortunately, I was not able to find the necessary time yet.


      Thanks,
      Dieter



      On 18.04.2019 18:27, Leeyoung wrote:


         Hi Pavan and Lou,

         To recap, the revision addressed all your comments in Prague meeting on the generalization of this draft so that it would be applicable in general contexts. And thanks to Tom, all other comments have been incorporated to improve the draft.

         The co-authors believe that this is ready for WG adoption. Please let us know if this is the case; otherwise, let us know what needs further to be done.

         Thanks & Best regards,
         Young (on behalf of co-authors)

         -----Original Message-----
         From: internet-drafts@ietf.org<mailto:internet-drafts@ietf.org> [mailto:internet-drafts@ietf.org]
         Sent: Thursday, April 18, 2019 11:18 AM
         To: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com><mailto:daniele.ceccarelli@ericsson.com>; Satish Karunanithi <satish.karunanithi@gmail.com><mailto:satish.karunanithi@gmail.com>; Leeyoung <leeyoung@huawei.com><mailto:leeyoung@huawei.com>; Dhruv Dhody <dhruv.dhody@huawei.com><mailto:dhruv.dhody@huawei.com>; Daniel King <d.king@lancaster.ac.uk><mailto:d.king@lancaster.ac.uk>; Ricard Vilata <ricard.vilalta@cttc.es><mailto:ricard.vilalta@cttc.es>; Ricard Vilalta <ricard.vilalta@cttc.es><mailto:ricard.vilalta@cttc.es>
         Subject: New Version Notification for draft-lee-teas-actn-pm-telemetry-autonomics-16.txt


         A new version of I-D, draft-lee-teas-actn-pm-telemetry-autonomics-16.txt
         has been successfully submitted by Young Lee and posted to the IETF repository.

         Name:          draft-lee-teas-actn-pm-telemetry-autonomics
         Revision:      16
         Title:         YANG models for VN & TE Performance Monitoring Telemetry and Scaling Intent Autonomics
         Document date: 2019-04-18
         Group:         Individual Submission
         Pages:         29
         URL:            https://www.ietf.org/internet-drafts/draft-lee-teas-actn-pm-telemetry-autonomics-16.txt
         Status:         https://datatracker.ietf.org/doc/draft-lee-teas-actn-pm-telemetry-autonomics/
         Htmlized:       https://tools.ietf.org/html/draft-lee-teas-actn-pm-telemetry-autonomics-16
         Htmlized:       https://datatracker.ietf.org/doc/html/draft-lee-teas-actn-pm-telemetry-autonomics
         Diff:           https://www.ietf.org/rfcdiff?url2=draft-lee-teas-actn-pm-telemetry-autonomics-16

         Abstract:
            This document provides YANG data models that describe performance
            monitoring telemetry and scaling intent mechanism for TE-tunnels and
            Virtual Networks (VN).

            The models presented in this draft allow customers to subscribe to
            and monitor their key performance data of their interest on the
            level of TE-tunnel or VN. The models also provide customers with the
            ability to program autonomic scaling intent mechanism on the level
            of TE-tunnel as well as VN.






         Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org.

         The IETF Secretariat

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--- End Message ---