Hi Tom,
Thank you for the comments.
Please see inline.
Cheers,
Med
> -----Message d'origine-----
> De : tom petch <daedulus@xxxxxxxxxxxxx>
> Envoyé : mercredi 18 mai 2022 10:40
> À : last-call@xxxxxxxx
> Cc : adrian@xxxxxxxxxxxx; opsawg@xxxxxxxx; opsawg-chairs@xxxxxxxx;
> draft-ietf-opsawg-l2nm@xxxxxxxx
> Objet : Re: Last Call: <draft-ietf-opsawg-l2nm-15.txt> (A YANG
> Network Data Model for Layer 2 VPNs) to Proposed Standard
>
> On 29/04/2022 15:40, The IESG wrote:
> > The IESG has received a request from the Operations and
> Management Area > Working Group WG (opsawg) to consider the
> following document: - 'A YANG > Network Data Model for Layer 2
> VPNs'
> > <draft-ietf-opsawg-l2nm-15.txt> as Proposed Standard
>
> Two more YANG quirks, belatedly.
[Med] Comments are still welcome as we still have two weeks before the IESG telechat.
>
> s.7.6 has
> | +--:(evpn-bgp)
> | +--rw df-preference?
> uint16
> | +--rw vpws-service-instance
> while s.7.6.2 has
> | +--:(evpn-bgp)
> | +--rw vpws-service-instance
> df-preference is present in the YANG module so I think that the
> approach in s.7.6 is preferable to that of s.7.6.2.
[Med] 7.6.2 does not aim to provide the full structure as it only zooms into "EVPN-VPWS Service Instance" part that wasn't expanded in 7.6:
| +--:(evpn-bgp)
| +--rw df-preference? uint16
| +--rw vpws-service-instance
| ... <============
I updated 7.6.2 to re-list "df-preference", though.
>
>
> s.7.5.2 has
> +--rw (signaling-option)? choice
> | +--:(bgp) case
> | | ... choice bgp-type
> | +--:(ldp-or-l2tp) case
>
> so I expect to see
> choice signaling-option which I do on page 87
> case bgp also on page 87
> ....
> case ldp-or-l2tp nowhere to be seen.
[Med] ACK. We do basically have the following choices:
7.5.2. Signaling Options . . . . . . . . . . . . . . . . . . 27
7.5.2.1. BGP . . . . . . . . . . . . . . . . . . . . . . . 29
7.5.2.2. LDP . . . . . . . . . . . . . . . . . . . . . . . 30
7.5.2.3. L2TP . . . . . . . . . . . . . . . . . . . . . . 31
As discussed during the AD review, ldp-or-l2tp are bundled because they share a set of common attributes. This is why we do have this part repeated in both 7.5.2.2 and 7.5.2.3:
| +--:(ldp-or-l2tp)
| +--rw ldp-or-l2tp
| +--rw agi?
| | rt-types:route-distinguisher
| +--rw saii? uint32
| +--rw remote-targets* [taii]
| | +--rw taii uint32
| | +--rw peer-addr inet:ip-address
| +--rw (ldp-or-l2tp)?
If we don't bundle them, we will have to use distinct names to refer to the same parameter to comply with rfc7950#section-4.2.7, which is unfortunate:
YANG allows the data model to segregate incompatible nodes into
distinct choices using the "choice" and "case" statements. The
"choice" statement contains a set of "case" statements that define
sets of schema nodes that cannot appear together. Each "case" may
contain multiple nodes, but each node may appear in only one "case"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
under a "choice".
^^^^^^^^^^^^^^^^
I updated the draft to call this out:
NEW:
Note that LDP and L2TP choices are bundled ("ldp-or-l2tp") because
they share a set of common parameters that are further detailed in
Sections 7.5.2.2 and 7.5.2.3.
> In fact, there is no case, rather there is a container with that
> identifier on page 93. This is valid YANG - a container can
> stand in
> for a case - but with six pages of YANG in-between, this is hard
> to
> follow. I would suggest /container/case/ or if there is a reason
> for
> not using case, then add a comment to that effect in the YANG
> module
> prior to the container statement.
>
> Tom Petch
>
> >
> > The IESG plans to make a decision in the next few weeks, and
> solicits final
> > comments on this action. Please send substantive comments to the
> > last-call@xxxxxxxx mailing lists by 2022-05-13. Exceptionally,
> comments may
> > be sent to iesg@xxxxxxxx instead. In either case, please retain
> the beginning
> > of the Subject line to allow automated sorting.
> >
> > Abstract
> >
> >
> > This document defines an L2VPN Network YANG Model (L2NM)
> which can be
> > used to manage the provisioning of Layer 2 Virtual Private
> Network
> > services within a network (e.g., service provider network).
> The L2NM
> > complements the Layer 2 Service Model (L2SM) by providing a
> network-
> > centric view of the service that is internal to a service
> provider.
> > The L2NM is particularly meant to be used by a network
> controller to
> > derive the configuration information that will be sent to
> relevant
> > network devices.
> >
> > Also, this document defines a YANG module to manage Ethernet
> segments
> > and the initial versions of two IANA-maintained modules that
> defines
> > a set of identities of BGP Layer 2 encapsulation types and
> pseudowire
> > types.
> >
> >
> >
> >
> > The file can be obtained via
> > https://datatracker.ietf.org/doc/draft-ietf-opsawg-l2nm/
> >
> >
> >
> > No IPR declarations have been submitted directly on this I-D.
> >
> >
> >
> >
> >
> > _______________________________________________
> > IETF-Announce mailing list
> > IETF-Announce@xxxxxxxx
> > https://www.ietf.org/mailman/listinfo/ietf-announce
> > .
> >
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