From: mohamed.boucadair@orange.com
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To: Gunter Van de Velde <gunter.van_de_velde@nokia.com>, The IESG
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Thread-Topic: Gunter Van de Velde's No Objection on
 draft-ietf-opsawg-teas-common-ac-14: (with COMMENT)
Thread-Index: AQHbaNfemfeWpGhQ1EOdlysx+hnHMLMa65hg
Date: Fri, 17 Jan 2025 12:56:57 +0000
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Hi Gunter, =


Thank you for the comments. =


I adopted most of your suggested edits as you can see at: https://author-to=
ols.ietf.org/api/iddiff?url_1=3Dhttps://boucadair.github.io/attachment-circ=
uit-model/draft-ietf-opsawg-teas-common-ac.txt&url_2=3Dhttps://boucadair.gi=
thub.io/attachment-circuit-model/gunter-iesg-review/draft-ietf-opsawg-teas-=
common-ac.txt

Also echoed the changes to Section 3 in the other documents of the AC I-Ds =
set.

Cheers,
Med

> -----Message d'origine-----
> De=A0: Gunter Van de Velde via Datatracker <noreply@ietf.org>
> Envoy=E9=A0: vendredi 17 janvier 2025 13:04
> =C0=A0: The IESG <iesg@ietf.org>
> Cc=A0: draft-ietf-opsawg-teas-common-ac@ietf.org; opsawg-
> chairs@ietf.org; opsawg@ietf.org; rrokui@ciena.com;
> rrokui@ciena.com
> Objet=A0: Gunter Van de Velde's No Objection on draft-ietf-opsawg-
> teas-common-ac-14: (with COMMENT)
> =

> =

> Gunter Van de Velde has entered the following ballot position for
> draft-ietf-opsawg-teas-common-ac-14: No Objection
> =

> When responding, please keep the subject line intact and reply to
> all email addresses included in the To and CC lines. (Feel free
> to cut this introductory paragraph, however.)
> =

> =

> =

> =

> -----------------------------------------------------------------
> COMMENT:
> -----------------------------------------------------------------
> =

> # Gunter Van de Velde, RTG AD, comments for draft-ietf-opsawg-
> teas-common-ac-14
> =

> =

> # This is a well written document. I have few non-blocking
> editorial comments
> =

> #DETAILED COMMENTS
> #=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =

> 92	   Connectivity services are provided by networks to
> customers via
> 93	   dedicated terminating points (e.g., Service Functions
> (SFs), Customer
> 94	   Premises Equipment (CPEs), Autonomous System Border
> Routers (ASBRs),
> 95	   data centers gateways, or Internet Exchange Points).  A
> connectivity
> 96	   service is basically about ensuring data transfer
> received from (or
> 97	   destined to) a given terminating point to (or from) other
> terminating
> 98	   points that belong to the same customer/service, an
> interconnection
> 99	   node, or an ancillary node.  A set of objectives for the
> connectivity
> 100	   service may eventually be negotiated and agreed upon
> between a
> 101	   customer and a network provider.  For that data transfer
> to take
> 102	   place within the provider network, it is assumed that
> adequate setup
> 103	   is provisioned over the links that connect customer
> terminating
> 104	   points and a provider network (a Provider Edge (PE),
> typically) so
> 105	   that data can be successfully exchanged over these links.
> The
> 106	   required setup is referred to in this document as an
> attachment
> 107	   circuits (ACs), while the underlying link is referred to
> as "bearer".
> =

> "
> Connectivity services are provided to customers by networks via
> dedicated terminating
> points (e.g., Service Functions (SFs), Customer Premises
> Equipment (CPEs), Autonomous
> System Border Routers (ASBRs), data center gateways, or Internet
> Exchange Points).
> A connectivity service ensures that data transferred from (or
> destined to) a given
> terminating point can reach (or originate from) other terminating
> points belonging
> to the same customer or service, or associated with an
> interconnection node or
> ancillary node. Objectives for such a connectivity service may be
> negotiated and
> agreed upon between a customer and a network provider.
> =

> For data to traverse the provider network, it is assumed that
> appropriate
> provisioning is in place over the links connecting the customer's
> terminating
> points to the provider network (typically, a Provider Edge (PE)),
> thereby
> enabling successful data exchange. This necessary provisioning is
> referred to
> in this document as "attachment circuits (ACs)," while the
> underlying link
> is referred to as the "bearer."
> "
> =

> 109	   When a customer requests a new service, the service can
> be bound to
> 110	   existing attachment circuits or trigger the instantiation
> of new
> 111	   attachment circuits.  Whether these attachment circuits
> are specific
> 112	   for a given service or are shared to deliver a variety of
> services is
> 113	   deployment-specific.
> =

> "
> When a customer requests a new service, that service can be
> associated with existing
> attachment circuits or may require the instantiation of new
> attachment circuits.
> Whether these attachment circuits are dedicated to a particular
> service or shared
> among multiple services depends on the specific deployment.
> "
> =

> 115	   An example of attachment circuits is depicted in Figure
> 1.  A
> 116	   Customer Edge (CE) may be a physical node or a logical
> entity.  A CE
> 117	   is seen by the network as a peer Service Attachment Point
> (SAP)
> 118	   [RFC9408].  CEs may be dedicated to one single service
> (e.g., Layer 3
> 119	   Virtual Private Network (VPN) or Layer 2 VPN) or host
> multiple
> 120	   services (e.g., Service Functions [RFC7665]).  A single
> AC (as seen
> 121	   by a network provider) may be bound to one or multiple
> peer SAPs
> 122	   (e.g., "CE1" and "CE2").  For example, and as discussed
> in [RFC4364],
> 123	   multiple CEs can be attached to a PE over the same
> attachment
> 124	   circuit.  This is typically implemented if the Layer 2
> infrastructure
> 125	   between the CE and the network provides a multipoint
> service.  The
> 126	   same CE may terminate multiple ACs.  These ACs may be
> over the same
> 127	   or distinct bearers.
> =

> "
> An example of attachment circuits is depicted in Figure 1. A
> Customer Edge (CE)
> may be realized as a physical node or a logical entity. From the
> network's
> perspective, a CE is treated as a peer Service Attachment Point
> (SAP) [RFC9408].
> CEs can be dedicated to a single service (e.g., Layer 3 Virtual
> Private Network (VPN)
> or Layer 2 VPN) or can host multiple services (e.g., Service
> Functions [RFC7665]).
> A single AC, as viewed by the network provider, may be bound to
> one or more peer
> SAPs (e.g., "CE1" and "CE2"). For instance, as discussed in
> [RFC4364], multiple
> CEs can attach to a PE over the same attachment circuit. This
> approach is
> typically deployed when the Layer 2 infrastructure between the CE
> and the
> network supports a multipoint service. A single CE may also
> terminate multiple
> ACs, which may be carried over the same bearer or over distinct
> bearers.
> "
> =

> 149	   This document specifies a common module ("ietf-ac-
> common") for
> 150	   attachment circuits (Section 5).  The model is designed
> with the
> 151	   intent to be reusable by other models and, therefore,
> ensure
> 152	   consistent AC structures among modules that manipulate
> ACs.  For
> 153	   example, the common model can be reused by service models
> to expose
> 154	   AC-as-a-Service (ACaaS) (e.g.,
> 155	   [I-D.ietf-opsawg-teas-attachment-circuit]), service
> models that
> 156	   require binding a service to a set of ACs (e.g., Network
> Slice
> 157	   Service [I-D.ietf-teas-ietf-network-slice-nbi-yang])),
> network models
> 158	   to provision ACs (e.g., [I-D.ietf-opsawg-ntw-attachment-
> circuit]),
> 159	   device models, etc.
> =

> "
> This document specifies a common module, "ietf-ac-common," for
> attachment circuits
> (see Section 5). The module is designed to be reusable by other
> models, thereby
> ensuring consistent AC structures across modules that manipulate
> ACs.
> For example, the common module can be reused by service models to
> expose
> AC-as-a-Service (ACaaS) (e.g., [I-D.ietf-opsawg-teas-attachment-
> circuit]) or by
> service models that require binding a service to a set of ACs
> (e.g., the Network
> Slice Service [I-D.ietf-teas-ietf-network-slice-nbi-yang]). It
> can also be
> employed by network models to provision ACs (e.g., [I-D.ietf-
> opsawg-ntw-attachment-circuit])
> and by device models, among others.
> "
> =

> 269	   "ietf-ac-common" is imported by "ietf-bearer-svc", "ietf-
> ac-svc", and
> 270	   "ietf-ac-ntw".  Bearers managed using "ietf-bearer-svc"
> may be
> 271	   referenced in the service ACs managed using "ietf-ac-
> svc".
> 272	   Similarly, a bearer managed using "ietf-bearer-svc" may
> list the set
> 273	   of ACs that use that bearer.  In order to ease
> correlation between an
> 274	   AC service requests and the actual AC provisioned in the
> network,
> 275	   "ietf-ac-ntw" uses the AC references exposed by "ietf-ac-
> svc".  To
> 276	   bind Layer 2 VPN or Layer 3 VPN services with ACs, "ietf-
> ac-glue"
> 277	   augments the LxSM and LxNM with AC service references
> exposed by
> 278	   "ietf-ac-svc" and AC network references exposed by "ietf-
> ac-ntw".
> =

> "
> The "ietf-ac-common" module is imported by "ietf-bearer-svc,"
> "ietf-ac-svc," and
> "ietf-ac-ntw." Bearers managed via "ietf-bearer-svc" may be
> referenced by
> service ACs managed using "ietf-ac-svc." Likewise, a bearer
> managed by
> "ietf-bearer-svc" may list the set of ACs that use that bearer.
> To facilitate
> correlation between an AC service request and the AC provisioned
> in the
> network, "ietf-ac-ntw" leverages the AC references exposed by
> "ietf-ac-svc."
> Furthermore, to bind Layer 2 VPN or Layer 3 VPN services with
> ACs,
> "ietf-ac-glue" augments the LxSM and LxNM with AC service
> references exposed
> by "ietf-ac-svc" and AC network references exposed by "ietf-ac-
> ntw."
> "
> =

> =

> Many thanks again for this document,
> =

> Kind Regards,
> Gunter Van de Velde,
> RTG AD
> =

> =


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