Re: [Teas] 答复: Proposed charter update

Lou Berger <> Mon, 15 October 2018 14:50 UTC

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To: Aijun Wang <>, 'Vishnu Pavan Beeram' <>, 'TEAS WG' <>, 'TEAS WG Chairs' <>
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From: Lou Berger <>
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Date: Mon, 15 Oct 2018 10:50:09 -0400
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Hi Aijun,
    Thank you for the comments.  Please see below for responses in-line.

On 10/11/2018 9:55 PM, Aijun Wang wrote:
> Hi, Vishnu and Lou:
> I have the following suggestions(inline) for the charter, please see 
> whether they are appropriate or not?
> Best Regards.
> Aijun Wang
> Network R&D and Operation Support Department
> China Telecom Corporation Limited Beijing Research Institute,Beijing, 
> China.
> *发件人:*Vishnu Pavan Beeram []
> *发送时间:*2018年10月8日14:50
> *收件人:*TEAS WG; TEAS WG Chairs
> *主题:*[Teas] Proposed charter update
> Hi,
> Over the past few months we've noted that our charter could use a bit of
> an update to match the current state of TEAS and other working groups.
> We've taken a pass at this and have a proposed revision.  Once the WG
> agrees on changes, we'll pass those changes along to our AD who is the
> actual owner of our charter.  The text is enclosed below as well as
> available with changes tracked at:
> Please discuss any proposed changes on the list, i.e., changes to the
> charter that are suggested in the google-doc but not agreed to here 
> will be ignored.
> We'd like to have the changes agreed to by the end of this month so the
> IESG may have time to review/act before  IETF103.
> Thank you,
> Pavan and Lou
> --
> Draft Update to TEAS WG Charter (Version 1)
> The Traffic Engineering Architecture and Signaling (TEAS) Working Group
> is responsible for defining IP, MPLS and GMPLS traffic engineering
> architecture and identifying required related control-protocol
> functions, i.e., routing and path computation element functions. The
> TEAS group is also responsible for standardizing generalized, i.e.,
> non-technology specific, RSVP-TE signaling protocol mechanisms,
> [Aijun Wang]: Is it more suitable to say “non-domain specific” instead 
> of “non-technology specific” ? I guess the author may mention that 
> RSVP-TE can be used in packet and non-packet network here.
How about:
   The TEAS group is also responsible for standardizing RSVP-TE 
signaling protocol mechanism that are not related to a specific 
switching technology.

> Traffic Engineering (TE) is the term used to refer to techniques that
> enable operators to control how specific traffic flows are treated
> within their networks. TE is applied to packet networks via MPLS TE
> tunnels and LSPs, but may also be provided by other mechanisms such as
> forwarding rules similar to policy-based routing. The MPLS-TE control
> plane was generalized to additionally support non-packet technologies
> via GMPLS.  RSVP-TE is the signaling protocol used for both MPLS-TE and
> GMPLS. Centralized and logically centralized control models are also
> supported, e.g., via Abstraction and Control of Traffic Engineered
> Networks (ACTN) and stateful-PCE.
> [Aijun Wang]: Is it more concise here to say “Centralized control 
> model are also supported”?

It may be more concise, but I think it is less clear so would prefer to 
leave as is.

>  The TEAS WG is responsible for:
>    a) Traffic-engineering architectures for generic applicability
> across packet and non-packet networks.. This includes, for example, both
> networks that include the use of PCE and those that conform with ACTN
> principles but don't make use of PCE. The PCE architecture itself is out
> of the WG scope.
> [Aijun Wang]: Is there any situation that conform with ACTN principles 
> but don’t’ make use of PCE? Is it more generalized to say “This 
> includes, for example, both networks that include the use of PCE or not”?
I don't believe ACTN requires use of PCE so I think the current text 
covers such cases while the proposed revision does not.

>    b) Definition of protocol-independent metrics and parameters
> (measurement and/or service attributes) for describing links and
> tunnels/paths required for traffic engineering (and related routing,
> signaling and path computation). These will be developed in conjunction
> with requests and requirements from other WGs to ensure overall 
> usefulness.
>    c) Functional specification of extensions for routing (OSPF, ISIS)
> and for path computation (PCE), including those that provide general
> enablers of traffic-engineering systems that also use RSVP-TE. Protocol
> formats and procedures that embody these extensions will be done in
> coordination with the WGs supervising those protocols.
> [Aijun Wang]: Is it more accurate to say “Functional specification of 
> extensions for routing (OSPF, ISIS) and for path computation _protocol 
> (PCEP)_,..”
I'm not sure, I really don't see any difference in the language.

Rereading this that it should say "may also use RSVP-TE".

>    d) Functional specification of generic (i.e., not data plane
> technology-specific) extensions for RSVP-TE, and the associated protocol
> formats and procedures that embody these extensions.
>    e) Definition of control plane mechanisms and extensions to allow
> the setup and maintenance of TE paths and TE tunnels that span multiple
> domains and/or switching technologies, where a domain may be an IGP
> area, an Autonomous System, or any other region of topological visibility.
>    f) Definition and extension of management and security techniques
> for RSVP-TE signaling. This includes configuring and monitoring RSVP-TE
> as well as mechanisms used to configure, control, and report OAM within
> TE networks. YANG and MIB modules may be considered.
> [Aijun Wang]: Is it more accurate to say “Definition and extension of 
> management and security techniques for TE path and TE tunnels 
> signaling….”, instead of only mentioning the “RSVP-TE signaling”?
This is a fair point.  How about "...for TP path and tunnel control"?

>   The TEAS working group is chartered to deliver the following:
>    1. Definition of additional abstract service, link, and path
> properties such as jitter, delay, and diversity. Extensions to IGPs to
> advertise these properties, and extensions to RSVP-TE to request and to
> accumulate these properties. Work with PCE WG to include these
> properties in computation requests.
>    2. Specification of terminology, architecture, and protocol
> requirements for abstraction and distribution of TE information between
> interconnected TE domains/layers.
>    3. Specification and protocol extensions for a GMPLS External
> Network-to-Network Interface (E-NNI), i.e., multi-domain GMPLS support.
>    4. Protocol mechanisms to signal associated LSPs in particular with
> different source nodes.
>    5. Requirements and protocol extensions for additional protection
> mechanisms including end-point protection, protection of P2MP LSPs, and
> inter-domain protection.
> [Aijun Wang]: Is it more generalized to replace “end-point protection” 
> with “TE-path and TE-tunnel protection”?
These are just examples.  How about: "including, for example, ..."?

Thank you again for the feedback!

>    6. YANG models in support of Traffic Engineering, in coordination
> with working groups working on YANG models for network topology and for
> technology-specific network attributes.
>   Requirements may be documented in stand-alone RFCs, may be folded
> into architecture or solutions RFCs, may be recorded on a wiki, or may
> be documented in an Internet-Draft that is not progressed to RFC.
>   The TEAS WG will coordinate with the following working groups:
>    - With the MPLS WG to maintain and extend MPLS-TE protocol
> mechanisms and to determine whether they should be generalized.
>    - With the CCAMP WG to maintain and extend non-packet, data plane
> technology-specific TE protocol mechanisms and to determine whether they
> should be generalized.
>    - With the LSR (OSPF and ISIS) WG to maintain or extend TE routing
> mechanisms.
>    - With the PCE WG on uses of a PCE in the traffic-engineering
> architecture, on PCE extensions per the above, and on RSVP-TE extensions
> to support PCE WG identified requirements.
>    - With the IDR WG on the use of BGP-LS in TE environments.
>    - With the DetNet WG on mechanisms (YANG models and protocols) to
> support DetNet use cases.
>    - With the SPRING WG on TE architecture and, where appropriate,
> TE-related protocol extensions.
> In doing this work, the WG will cooperate with external SDOs (such as
> the ITU-T and the IEEE 802.1) as necessary.
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