Re: [OPSAWG] Last Call: <draft-ietf-opsawg-l2nm-15.txt> (A YANG Network Data Model for Layer 2 VPNs) to Proposed Standard BGP L2

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Hi Tom, 

Thank you for the comments. 

Please see inline. 

Cheers,
Med

> -----Message d'origine-----
> De : tom petch <[e-mail]>
> Envoyé : vendredi 13 mai 2022 11:23
> À : [e-mail]
> Cc : [e-mail]; [e-mail]; [e-mail];
> [e-mail]
> Objet : Re: Last Call: <draft-ietf-opsawg-l2nm-15.txt> (A YANG
> Network Data Model for Layer 2 VPNs) to Proposed Standard BGP L2
> 
> I find some lack of clarity with regard of the BGP Layer 2
> Encapsulation Types module.
> 
> I see no description of the module in the body of the document,
> only the module itself and the IANA Considerations (S.10.2).

[Med] Hmm ... we do already have the following in Section 5:

   Also, the L2NM uses the IANA-maintained modules "iana-bgp-l2-encaps"
   (Section 8.1) and "iana-pseudowire-types" (Section 8.2) to identify a
   Layer 2 encapsulation type.

and then in Section 7, you can read things such as:

   Remote CEs that are entitled to connect to the same VPN should fit
   with the CE range ('ce-range') as discussed in Section 2.2.3 of
   [RFC6624]. 'pw-encapsulation-type' is used to control the PW
   encapsulation type (Section 3 of [RFC6624]).  The value of the 'pw-
   encapsulation-type' are taken from the IANA-maintained "iana-bgp-
   l2-encaps" module (Section 8.1).

Is there anything else you think we should say? 

> 
> S.10.2 says ' add this note to both modules'.  I only see one
> module.

[Med] This was fixed as per the genart review. Thanks for catching this as well. 

> 
> It gives the name of the registry but not what Group it is part of
> i.e.
> 'Border Gateway Protocol(BGP) Parameters'.  Admittedly this is one
> of the better chosen Group names but it is always good practice
> IMO to specify Group name and Registry name when referencing IANA
> entries.

[Med] The note will be placed under the BGP parameters registry. I don't think adding "under BGP parameters...registry" to the note is useful.    

> 
> It also says that the name of the 'identity' is the lower case of
> the encapsulation name provided in the description.  This is not
> what happens here, in the module, in many if not most cases.  The
> identity name is based on the Description in the IANA Registry but
> heavily abbreviated.  Who will decide on an acceptable
> abbreviation, meaningful, unique, for future additions?

[Med] I think this one was clarified as part of Dale's genart review. Please check the diff shared in that thread. 

> 
> 'Unassigned or reserved values..' worth spelling out that those
> are the values in the BGP Layer 2 Encapsulation Types registry.

[Med] Yes.

> 
> And what about the Experimental Use values? They are not in the
> IANA module but why not?

[Med] If such values appear in the re

> 
> 'unique revision date' well yes but the current date would seem
> more useful.
> 

[Med] This wording was agreed with Rob as there was a case where IANA accidentally created two entries with the same revision date when adding two types. 

> Section 8.1 describes the module as 'YANG data types defined by
> IANA'
> which seems odd.  The underlying data types are defined by the IDR
> WG; perhaps 'maintained by'.

[Med] Indeed. Changed to:

    "This module contains a collection of IANA-maintained YANG 
     data types that are used for referring to BGP Layer 2 
     encapsulation types. ..

> 
> I note that Section 8.2 which contains the other IANA module,
> IANA-pseudowire-types, has a section title of 'IANA Encapsulation
> Types'
> which seems odd in the absence of any explanation.
> 

[Med] Good catch. Changed to "IANA-Maintained Module for Pseudowire Types"

> 
> Tom Petch
> 
> 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
> >
> > 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
> > [e-mail] mailing lists by 2022-05-13. Exceptionally,
> comments may
> > be sent to [e-mail] 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
> > [e-mail]
> > https://www.ietf.org/mailman/listinfo/ietf-announce
> > .
> >

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