Re: [Teas] IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

["Xufeng Liu" <[e-mail]>]

Hi Gert,

 

Yes. We do benefit from the reference that you mentioned.

Thanks,

- Xufeng

 

From: Gert Grammel [mailto:[e-mail]] 
Sent: Thursday, February 23, 2017 1:15 PM
To: Xufeng Liu <[e-mail]>; 'Xufeng Liu' <[e-mail]>; 'Belotti, Sergio (Nokia - IT)' <[e-mail]>; Vishnu Pavan Beeram <[e-mail]>; 'Igor Bryskin' <[e-mail]>; 'Oscar Gonzalez De Dios' <[e-mail]>; 'Tarek Saad' <[e-mail]>; 'Himanshu Shah' <[e-mail]>; 'Lou Berger' <[e-mail]>; 'BRUNGARD, DEBORAH A (ATTLABS)' <[e-mail]>; 'Susan Hares' <[e-mail]>; 'Zafar Ali (zali)' <[e-mail]>; EXT - Mazen Khaddam <[e-mail]>; Tony Le <[e-mail]>; 'Beller, Dieter (Nokia - DE)' <[e-mail]>; 'Rajan Rao' <[e-mail]>; 'Zhangxian (Xian)' <[e-mail]>; 'Anurag Sharma' <[e-mail]>; 'Italo Busi' <[e-mail]>
Cc: [e-mail]
Subject: Re: [Teas] IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Xufeng,

 

Thank you for the references (expanded below for better reading).  They are predominantly GMPLS related, which suggests the DT is looking at modelling control plane entities. So coming back to the initial question about interpreting the DT output. Would interpretation #3 kind of capture the intention of the example?  

<snip> 3.  Perhaps it shall represent a control plane view on switching rather than a data plane view. <snip>

 

Given the different history of people in the DT, you may also benefit from considering as a reference https://tools.ietf.org/html/rfc4397:

<snip>  Because the GMPLS and ASON architectures were developed by different people in different standards bodies, and because the architectures have very different historic backgrounds (the Internet, and transport networks respectively), the terminology used is different. <snip>

 

The WG would certainly benefit if terminology used by the DT is clarified to avoid ambiguity in interpreting the output.

 

Thanks

 

Gert

 

*	https://tools.ietf.org/html/rfc4328 Generalized Multi-Protocol Label Switching (GMPLS) Signaling Extensions for G.709 Optical Transport Networks Control
*	https://tools.ietf.org/html/rfc4206 Label Switched Paths (LSP) Hierarchy with Generalized Multi-Protocol Label Switching (GMPLS) Traffic Engineering (TE)
*	https://tools.ietf.org/html/rfc5212 Requirements for GMPLS-Based Multi-Region and Multi-Layer Networks (MRN/MLN)
*	https://tools.ietf.org/html/rfc5339 Evaluation of Existing GMPLS Protocols against Multi-Layer and Multi-Region Networks (MLN/MRN)
*	https://tools.ietf.org/html/rfc6001 Generalized MPLS (GMPLS) Protocol Extensions for Multi-Layer and Multi-Region Networks (MLN/MRN)
*	https://tools.ietf.org/html/rfc7926 Problem Statement and Architecture for Information Exchange between Interconnected Traffic-Engineered Networks
*	https://tools.ietf.org/html/rfc5623 Framework for PCE-Based Inter-Layer MPLS and GMPLS Traffic Engineering
*	https://tools.ietf.org/html/rfc7138 Traffic Engineering Extensions to OSPF for GMPLS Control of Evolving G.709 Optical Transport Networks

 

 

 

 

 

From: Xufeng Liu <[e-mail] <mailto:[e-mail]> >
Date: Thursday 23 February 2017 at 08:31
To: Gert Grammel <[e-mail] <mailto:[e-mail]> >, 'Xufeng Liu' <[e-mail] <mailto:[e-mail]> >, "'Belotti, Sergio (Nokia - IT)'" <[e-mail] <mailto:[e-mail]> >, Pavan Beeram <[e-mail] <mailto:[e-mail]> >, 'Igor Bryskin' <[e-mail] <mailto:[e-mail]> >, "[e-mail] <mailto:[e-mail]> " <[e-mail] <mailto:[e-mail]> >, 'Tarek Saad' <[e-mail] <mailto:[e-mail]> >, 'Himanshu Shah' <[e-mail] <mailto:[e-mail]> >, Lou Berger <[e-mail] <mailto:[e-mail]> >, Deborah Brungard <[e-mail] <mailto:[e-mail]> >, Susan Hares <[e-mail] <mailto:[e-mail]> >, Zafar Ali <[e-mail] <mailto:[e-mail]> >, EXT - Mazen Khaddam <[e-mail] <mailto:[e-mail]> >, Tony Le <[e-mail] <mailto:[e-mail]> >, Dieter Beller <[e-mail] <mailto:[e-mail]> >, "[e-mail] <mailto:[e-mail]> " <[e-mail] <mailto:[e-mail]> >, Zhangxian <[e-mail] <mailto:[e-mail]> >, 'Anurag Sharma' <[e-mail] <mailto:[e-mail]> >, 'Italo Busi' <[e-mail] <mailto:[e-mail]> >
Cc: TEAS WG <[e-mail] <mailto:[e-mail]> >
Subject: RE: [Teas] IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Hi Gert,

 

Those include  4328,  4206, 5212, 5339, 6001, 7926, 5623, 7138.

Thanks,

- Xufeng

 

From: Gert Grammel [mailto:[e-mail]] 
Sent: Wednesday, February 22, 2017 3:26 PM
To: Xufeng Liu <[e-mail] <mailto:[e-mail]> >; 'Xufeng Liu' <[e-mail] <mailto:[e-mail]> >; 'Belotti, Sergio (Nokia - IT)' <[e-mail] <mailto:[e-mail]> >; Vishnu Pavan Beeram <[e-mail] <mailto:[e-mail]> >; 'Igor Bryskin' <[e-mail] <mailto:[e-mail]> >; 'Oscar Gonzalez De Dios' <[e-mail] <mailto:[e-mail]> >; 'Tarek Saad' <[e-mail] <mailto:[e-mail]> >; 'Himanshu Shah' <[e-mail] <mailto:[e-mail]> >; 'Lou Berger' <[e-mail] <mailto:[e-mail]> >; 'BRUNGARD, DEBORAH A (ATTLABS)' <[e-mail] <mailto:[e-mail]> >; 'Susan Hares' <[e-mail] <mailto:[e-mail]> >; 'Zafar Ali (zali)' <[e-mail] <mailto:[e-mail]> >; EXT - Mazen Khaddam <[e-mail] <mailto:[e-mail]> >; Tony Le <[e-mail] <mailto:[e-mail]> >; 'Beller, Dieter (Nokia - DE)' <[e-mail] <mailto:[e-mail]> >; 'Rajan Rao' <[e-mail] <mailto:[e-mail]> >; 'Zhangxian (Xian)' <[e-mail] <mailto:[e-mail]> >; 'Anurag Sharma' <[e-mail] <mailto:[e-mail]> >; 'Italo Busi' <[e-mail] <mailto:[e-mail]> >
Cc: [e-mail] <mailto:[e-mail]> 
Subject: Re: [Teas] IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Xufeng,

 

Which RFC numbers did you have in mind?

 

Gert

 

From: Xufeng Liu <[e-mail] <mailto:[e-mail]> >
Date: Wednesday 22 February 2017 at 06:40
To: Gert Grammel <[e-mail] <mailto:[e-mail]> >, 'Xufeng Liu' <[e-mail] <mailto:[e-mail]> >, "'Belotti, Sergio (Nokia - IT)'" <[e-mail] <mailto:[e-mail]> >, Pavan Beeram <[e-mail] <mailto:[e-mail]> >, 'Igor Bryskin' <[e-mail] <mailto:[e-mail]> >, "[e-mail] <mailto:[e-mail]> " <[e-mail] <mailto:[e-mail]> >, 'Tarek Saad' <[e-mail] <mailto:[e-mail]> >, 'Himanshu Shah' <[e-mail] <mailto:[e-mail]> >, Lou Berger <[e-mail] <mailto:[e-mail]> >, Deborah Brungard <[e-mail] <mailto:[e-mail]> >, Susan Hares <[e-mail] <mailto:[e-mail]> >, Zafar Ali <[e-mail] <mailto:[e-mail]> >, EXT - Mazen Khaddam <[e-mail] <mailto:[e-mail]> >, Tony Le <[e-mail] <mailto:[e-mail]> >, Dieter Beller <[e-mail] <mailto:[e-mail]> >, "[e-mail] <mailto:[e-mail]> " <[e-mail] <mailto:[e-mail]> >, Zhangxian <[e-mail] <mailto:[e-mail]> >, 'Anurag Sharma' <[e-mail] <mailto:[e-mail]> >, 'Italo Busi' <[e-mail] <mailto:[e-mail]> >
Cc: TEAS WG <[e-mail] <mailto:[e-mail]> >
Subject: RE: [Teas] IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Hi Gert,

 

The thermology used in the draft is consistent with existing RFCs. The slides shown here are used for our premilitary discussions, and the used terms will be adjusted before they are incorporated into the draft.

Thanks,

- Xufeng  

 

From: Gert Grammel [mailto:[e-mail]] 
Sent: Tuesday, February 21, 2017 2:41 PM
To: Xufeng Liu <[e-mail] <mailto:[e-mail]> >; Belotti, Sergio (Nokia - IT) <[e-mail] <mailto:[e-mail]> >; Vishnu Pavan Beeram <[e-mail] <mailto:[e-mail]> >; Igor Bryskin <[e-mail] <mailto:[e-mail]> >; Oscar Gonzalez De Dios <[e-mail] <mailto:[e-mail]> >; Tarek Saad <[e-mail] <mailto:[e-mail]> >; Himanshu Shah <[e-mail] <mailto:[e-mail]> >; Lou Berger <[e-mail] <mailto:[e-mail]> >; BRUNGARD, DEBORAH A (ATTLABS) <[e-mail] <mailto:[e-mail]> >; Susan Hares <[e-mail] <mailto:[e-mail]> >; Zafar Ali (zali) <[e-mail] <mailto:[e-mail]> >; EXT - Mazen Khaddam <[e-mail] <mailto:[e-mail]> >; Tony Le <[e-mail] <mailto:[e-mail]> >; Beller, Dieter (Nokia - DE) <[e-mail] <mailto:[e-mail]> >; Rajan Rao <[e-mail] <mailto:[e-mail]> >; Zhangxian (Xian) <[e-mail] <mailto:[e-mail]> >; [e-mail] <mailto:[e-mail]> ; Anurag Sharma <[e-mail] <mailto:[e-mail]> >; Italo Busi <[e-mail] <mailto:[e-mail]> >
Cc: [e-mail] <mailto:[e-mail]> 
Subject: Re: [Teas] IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Xufeng, Sergio, Dieter,

 

I had a look at the slide distributed by the Design Team earlier (see below) and wonder what it is supposed to depict. My starting point was a look at https://tools.ietf.org/html/rfc5212 which deals with optical only (covering what is called "Layer0" below). It would be great if the team could provide some more context as to where to drive the related YANG Model.

Let me share a few thoughts to illustrate the different interpretation without suggesting any of those would match the intention:

1.	At a glance, the drawing looks like the re-use of a classical ITU-T functional model but there the term "Layer" has a different connotation. If the intention is to depict data plane layers (according to ITU) then they should be spelled out in relevant terms (like OPU/ODU/OTU/OCH/OMS/OTS etc.). Evidently the picture would now grow from 3 to a double digit number of ITU-T Layers, but at least represent a half way accurate complexity/scale of the modelling effort.
2.	Maybe the aim is to depict technologies rather than Layers. However, in this case terms like "L0+L1-switch only" get problematic because there are several granularities of switching even inside technologies which aren't depicted here. So probably the YANG model would need to go into a deeper modelling exercise similar to point 1. 
3.	Perhaps it shall represent a control plane view on switching rather than a data plane view. In that case however we'd probably need to use terms of  https://tools.ietf.org/html/rfc5212 where applicable, but this would change the picture/model even more

 

 

Thanks

 

Gert

 



 

 

From: Teas <[e-mail] <mailto:[e-mail]> > on behalf of Xufeng Liu <[e-mail] <mailto:[e-mail]> >
Date: Tuesday 21 February 2017 at 08:59
To: "Belotti, Sergio (Nokia - IT)" <[e-mail] <mailto:[e-mail]> >, Pavan Beeram <[e-mail] <mailto:[e-mail]> >, Igor Bryskin <[e-mail] <mailto:[e-mail]> >, "[e-mail] <mailto:[e-mail]> " <[e-mail] <mailto:[e-mail]> >, Tarek Saad <[e-mail] <mailto:[e-mail]> >, Himanshu Shah <[e-mail] <mailto:[e-mail]> >, Lou Berger <[e-mail] <mailto:[e-mail]> >, Deborah Brungard <[e-mail] <mailto:[e-mail]> >, Susan Hares <[e-mail] <mailto:[e-mail]> >, Zafar Ali <[e-mail] <mailto:[e-mail]> >, EXT - Mazen Khaddam <[e-mail] <mailto:[e-mail]> >, Tony Le <[e-mail] <mailto:[e-mail]> >, Dieter Beller <[e-mail] <mailto:[e-mail]> >, "[e-mail] <mailto:[e-mail]> " <[e-mail] <mailto:[e-mail]> >, Zhangxian <[e-mail] <mailto:[e-mail]> >, "[e-mail] <mailto:[e-mail]> " <[e-mail] <mailto:[e-mail]> >, Anurag Sharma <[e-mail] <mailto:[e-mail]> >, Italo Busi <[e-mail] <mailto:[e-mail]> >
Cc: TEAS WG <[e-mail] <mailto:[e-mail]> >
Subject: Re: [Teas] IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Hi Sergio,

 

This should be good. We already got the slides from Dieter, and we will add it as an example. Since you are doing this already, can you send me the YANG mapping once you get it done?

 

Thanks,

 

- Xufeng

 

From: Belotti, Sergio (Nokia - IT) [mailto:[e-mail]] 
Sent: Monday, February 20, 2017 10:39 AM
To: Xufeng Liu <[e-mail] <mailto:[e-mail]> >; Vishnu Pavan Beeram <[e-mail] <mailto:[e-mail]> >; Igor Bryskin <[e-mail] <mailto:[e-mail]> >; Oscar Gonzalez De Dios <[e-mail] <mailto:[e-mail]> >; Tarek Saad <[e-mail] <mailto:[e-mail]> >; Himanshu Shah <[e-mail] <mailto:[e-mail]> >; Lou Berger <[e-mail] <mailto:[e-mail]> >; BRUNGARD, DEBORAH A (ATTLABS) <[e-mail] <mailto:[e-mail]> >; Susan Hares <[e-mail] <mailto:[e-mail]> >; Zafar Ali (zali) <[e-mail] <mailto:[e-mail]> >; Khaddam, Mazen (CCI-Atlanta) <[e-mail] <mailto:[e-mail]> >; Tony Le <[e-mail] <mailto:[e-mail]> >; Beller, Dieter (Nokia - DE) <[e-mail] <mailto:[e-mail]> >; Rajan Rao <[e-mail] <mailto:[e-mail]> >; Zhangxian (Xian) <[e-mail] <mailto:[e-mail]> >; [e-mail] <mailto:[e-mail]> ; Anurag Sharma <[e-mail] <mailto:[e-mail]> >; Italo Busi <[e-mail] <mailto:[e-mail]> >
Cc: [e-mail] <mailto:[e-mail]> 
Subject: RE: IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Hi Xufeng, Igor

May be it would be good , based on slides Dieter shown last time, to add a “model mapping” to see real yang entities   involved for TL definition .

We are trying to do this job in Transport Design Team in CCAMP for specific use cases.

 

What do you think?

 

Thanks

Sergio

 

 

From: Xufeng Liu [mailto:[e-mail]] 
Sent: Monday, February 20, 2017 4:31 PM
To: Vishnu Pavan Beeram <[e-mail] <mailto:[e-mail]> >; Igor Bryskin <[e-mail] <mailto:[e-mail]> >; Oscar Gonzalez De Dios <[e-mail] <mailto:[e-mail]> >; Tarek Saad <[e-mail] <mailto:[e-mail]> >; Himanshu Shah <[e-mail] <mailto:[e-mail]> >; Lou Berger <[e-mail] <mailto:[e-mail]> >; BRUNGARD, DEBORAH A (ATTLABS) <[e-mail] <mailto:[e-mail]> >; Susan Hares <[e-mail] <mailto:[e-mail]> >; Zafar Ali (zali) <[e-mail] <mailto:[e-mail]> >; Khaddam, Mazen (CCI-Atlanta) <[e-mail] <mailto:[e-mail]> >; Tony Le <[e-mail] <mailto:[e-mail]> >; Belotti, Sergio (Nokia - IT) <[e-mail] <mailto:[e-mail]> >; Beller, Dieter (Nokia - DE) <[e-mail] <mailto:[e-mail]> >; Rajan Rao <[e-mail] <mailto:[e-mail]> >; Zhangxian (Xian) <[e-mail] <mailto:[e-mail]> >; [e-mail] <mailto:[e-mail]> ; Belotti, Sergio (Nokia - IT) <[e-mail] <mailto:[e-mail]> >; Anurag Sharma <[e-mail] <mailto:[e-mail]> >; Italo Busi <[e-mail] <mailto:[e-mail]> >
Cc: [e-mail] <mailto:[e-mail]> 
Subject: IETF TE Topology YANG Model Design Meeting Notes - 2017-02-15

 

Attendees:

Xufeng, Igor, Pavan, Carlo, Sergio, Tarek, Pawel Ka, Dieter

 

- Continued discussion on multi-layer topologies covering more than 2 layers.

  > Discussed the modeling transformation by using transitional link.

  > A 3-layer hybrid node might be decomposed into 3 logical nodes.

  > Dieter presented the use case of a multi-layer topology with 3 layers.

  > We have confirmed that the existing model can support such a

    modeling transformation. 

 

- Comments from Ievgen seem to be related to TE model (not this

  model). Will respond to the email.

 

- Draft text

  > Discussed the clarification on customized topology vs. abstract topology

  > Will add more clarification texts in the draft

 

- Logistics

  > We will move the weekly meeting one hour earlier to resolve some conflicts.

 

Thanks,

 

- Xufeng

 

Note: Please drop me an email if you need an invite for joining the weekly call.