Re: [Teas] New Slicing revision: I-D Action: draft-ietf-teas-ietf-network-slices-01.txt

"Dongjie (Jimmy)" <jie.dong@huawei.com> Tue, 27 April 2021 06:40 UTC

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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: Daniele Ceccarelli <daniele.ceccarelli=40ericsson.com@dmarc.ietf.org>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "teas@ietf.org" <teas@ietf.org>
Thread-Topic: [Teas] New Slicing revision: I-D Action: draft-ietf-teas-ietf-network-slices-01.txt
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Date: Tue, 27 Apr 2021 06:39:53 +0000
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Subject: Re: [Teas] New Slicing revision: I-D Action: draft-ietf-teas-ietf-network-slices-01.txt
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Hi Daniele, 

Please see some comments inline:

> -----Original Message-----
> From: Teas [mailto:teas-bounces@ietf.org] On Behalf Of Daniele Ceccarelli
> Sent: Monday, April 19, 2021 5:14 PM
> To: adrian@olddog.co.uk; teas@ietf.org
> Subject: Re: [Teas] New Slicing revision: I-D Action:
> draft-ietf-teas-ietf-network-slices-01.txt
> 
> Hi Adrian,
> 
> Completely agree.
> Please see in line for some more comments.
> 
> BR
> Daniele
> 
> > -----Original Message-----
> > From: Adrian Farrel <adrian@olddog.co.uk>
> > Sent: den 16 april 2021 21:06
> > To: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>om>;
> > teas@ietf.org
> > Subject: RE: [Teas] New Slicing revision: I-D Action:
> > draft-ietf-teas-ietf-network- slices-01.txt
> >
> > Hi Daniele,
> >
> > > Regarding the discussion on realization.
> > >
> > > Maybe we could have section 6 split into an analysis of existing
> > > tools,
> > something like:
> > >
> > > 6.  Applicability of existing IETF tools to IETF Network Slices
> > > 6.1 ACTN
> > > 6.2 Enhanced VPN
> > > 6.3 draft-bestbar
> >
> > Yes, that's the split I am seeing (although may need a better name for 6.3).
> 
> [DC] yes definitely. Maybe something like: "Network slicing and slice
> aggregates in IP/MPLS networks"

Before listing draft-bestbar or slice aggregate as one of the "existing tools", its relationship with the enhanced VPN work needs to be clarified first. And since it is currently an individual document, maybe it is a little early to be considered as an "existing IETF tool"? 

Best regards,
Jie

> 
> >
> > However, I don't envision much text in each section. IMHO, this
> > document is not the place to expound in detail on the realisation
> > possibilities. Once we have established the key architectural points
> > in this document, people can write other documents (applicability
> > statements) to explain how their favourite approach can be applied to satisfy
> the architecture.
> 
> [DC] Makes sense. It's not the scope of the framework to define solutions. An
> hook to existing work is more than enough. Maybe solution drafts might go
> into a more detailed analysis of how each solution can meet the requirements.
> 
> >
> > > (I still believe the VTN can be a particular type of VN...but this
> > > is
> > another story)
> >
> > That is a discussion that is really worth continuing, but I think it
> > is outside the scope of this document.
> >
> > > Willing to be more creative we could split them into data plane, and
> > control/management
> > > plane?
> >
> > I wonder whether this should find its way into...
> >      5.5.  Realizing IETF Network Slice  . . . . . . . . . . . . . .  20
> >        5.5.1.  Underlying Technology . . . . . . . . . . . . . . . .
> > 20
> >
> [DC]  yes, that's a valuable option. Even if as you said above it would be just
> an reference.
> 
> > Cheers,
> > Adrian
> >
> > -----Original Message-----
> > From: Teas <teas-bounces@ietf.org> On Behalf Of Adrian Farrel
> > Sent: den 16 april 2021 12:39
> > To: teas@ietf.org
> > Cc: adrian@olddog.co.uk
> > Subject: [Teas] New Slicing revision: I-D Action:
> > draft-ietf-teas-ietf-network-slices-01.txt
> >
> > Hi,
> >
> > In this revision, I have tidied the text. That involved:
> > - Fixing inconsistent editorial standards between the source documents
> > - Some more minor editorials
> > - Moving a couple of sections around
> > - Collapsing a little duplication arising from pulling text from two
> > places
> > - Removing cross-references between the source documents
> > - Removing the tagging of the source material
> >
> > In doing so, there were two small paragraphs that didn't seem to belong.
> > These can be seen in the Appendix.
> >
> > ACTION: All: Please shout if you believe this text should not be deleted.
> >
> > While this document is now in a condition that can be reviewed and
> > commented on, I propose to make some suggestions to reduce and
> > consolidate the text. I will bring these to the list as separate
> > threads (some have already been seen on the list, but we should make
> > the proposed changes clear). They will
> > cover:
> >
> > - Discussion of realisation.
> >   This should be a discussion of architectural realisation, not of
> > underlying technologies.
> >   Currently we have:
> >    - a large section on ACTN
> >    - a couple of references to VPN+
> >    - no mention of the architecture underlying
> > draft-bestbar-teas-yang-slice- policy
> >   I already suggested (on list) a way to reduce the ACTN text, but it
> > has since been
> >   proposed to me that all discussion of realisation of the architecture can
> be best
> >   achieved with brief paragraphs and references. I will propose text.
> >
> > - Isolation and "unmeasurable SLOs"
> >   This has long been a contentious topic. I think we had reached a bit
> > of a compromise
> >   in the definitions draft, but doing the merge has caused me to
> > re-read it and I am
> >   uneasy. I will be making a text suggestion to clarify the purpose
> > and meaning of the
> >   section on isolation, and that will depend on us also clarifying the
> > description of
> >   "directly measurable SLOs" and "indirectly measurable SLOs.
> >
> > - Revisiting the definition of a network slice
> >   This is obviously pretty core to our work! John Drake previously
> > sent a suggestion to
> >   the list (2021-04-03). This caused a bit of discussion and raises a
> > number of points.
> >   I plan to try to tease out the various points to see whether we can agree
> them
> >   Separately and then come up with new definitions text. This may be a
> > good topic
> >   For our first telechat on the document.
> >
> > ACTION: Chairs: Decide what the rules are for having telechat meetings
> > for this document.
> >
> > Thanks,
> > Adrian
> >
> > -----Original Message-----
> > From: I-D-Announce <i-d-announce-bounces@ietf.org> On Behalf Of
> > internet- drafts@ietf.org
> > Sent: 16 April 2021 11:19
> > To: i-d-announce@ietf.org
> > Cc: teas@ietf.org
> > Subject: I-D Action: draft-ietf-teas-ietf-network-slices-01.txt
> >
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts directories.
> > This draft is a work item of the Traffic Engineering Architecture and
> > Signaling WG of the IETF.
> >
> >         Title           : Framework for IETF Network Slices
> >         Authors         : Adrian Farrel
> >                           Eric Gray
> >                           John Drake
> >                           Reza Rokui
> >                           Shunsuke Homma
> >                           Kiran Makhijani
> >                           Luis M. Contreras
> >                           Jeff Tantsura
> > 	Filename        : draft-ietf-teas-ietf-network-slices-01.txt
> > 	Pages           : 33
> > 	Date            : 2021-04-16
> >
> > Abstract:
> >    This document describes network slicing in the context of networks
> >    built from IETF technologies.  It defines the term "IETF Network
> >    Slice" and establishes the general principles of network slicing in
> >    the IETF context.
> >
> >    The document discusses the general framework for requesting and
> >    operating IETF Network Slices, the characteristics of an IETF Network
> >    Slice, the necessary system components and interfaces, and how
> >    abstract requests can be mapped to more specific technologies.  The
> >    document also discusses related considerations with monitoring and
> >    security.
> >
> >    This document also provides definitions of related terms to enable
> >    consistent usage in other IETF documents that describe or use aspects
> >    of IETF Network Slices.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-teas-ietf-network-slices/
> >
> > There are also htmlized versions available at:
> > https://tools.ietf.org/html/draft-ietf-teas-ietf-network-slices-01
> > https://datatracker.ietf.org/doc/html/draft-ietf-teas-ietf-network-sli
> > ces-01
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-teas-ietf-network-slices-
> > 01
> >
> >
> > Please note that it may take a couple of minutes from the time of
> > submission until the htmlized version and diff are available at tools.ietf.org.
> >
> > Internet-Drafts are also available by anonymous FTP at:
> > ftp://ftp.ietf.org/internet-drafts/
> >
> >
> > _______________________________________________
> > I-D-Announce mailing list
> > I-D-Announce@ietf.org
> > https://www.ietf.org/mailman/listinfo/i-d-announce
> > Internet-Draft directories: http://www.ietf.org/shadow.html or
> > ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> >
> > _______________________________________________
> > Teas mailing list
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> 
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