Re: [Teas] FW: New Version Notification for draft-bestbar-teas-ns-packet-01.txt

"Joel M. Halpern" <jmh@joelhalpern.com> Sun, 07 February 2021 19:15 UTC

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To: Igor Bryskin <i_bryskin=40yahoo.com@dmarc.ietf.org>
Cc: TEAS WG <teas@ietf.org>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [Teas] FW: New Version Notification for draft-bestbar-teas-ns-packet-01.txt
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I disagree.
The edge of the domain receives and classifies the packet.  It can use 
any information it can to decide what aggregate the slice belongs in. 
Once that is done, the IETF network slice implementation network should 
simply obey the instruction as to what aggregate the packet belongs in. 
  The carrying network does not need to care about the external network 
slices.  And by avoiding such concern, all the parts scale better and we 
get a clean division of responsibility.

Yours,
Joel

On 2/7/2021 1:58 PM, Igor Bryskin wrote:
> Pavan,
> 
> I assume:
> - that a node, generally speaking, needs to make a forwarding decision 
> based on the packet's slice topology;
> - said topology may change dynamically, and so is the slice membership 
> in the slice aggregate.
> Therefore. It is better, in my opinion, to carry slice ID in packets and 
> let nodes (re-)define slice aggregate membership independently.
> 
> Igor
> 
> Get Outlook for Android <https://aka.ms/ghei36>
> 
> ------------------------------------------------------------------------
> *From:* Teas <teas-bounces@ietf.org> on behalf of Vishnu Pavan Beeram 
> <vishnupavan@gmail.com>
> *Sent:* Sunday, February 7, 2021, 11:48 AM
> *To:* Igor Bryskin
> *Cc:* Tarek Saad; Gyan Mishra; TEAS WG; 
> draft-bestbar-teas-ns-packet@ietf.org
> *Subject:* Re: [Teas] FW: New Version Notification for 
> draft-bestbar-teas-ns-packet-01.txt
> 
> Igor, Hi!
> 
> Please see inline.
> 
> Regards,
> -Pavan (as a co-author)
> 
> On Sun, Feb 7, 2021 at 8:03 AM Igor Bryskin <i_bryskin@yahoo.com 
> <mailto:i_bryskin@yahoo.com>> wrote:
> 
>     Gyan and Pavan,
> 
>     When a packet arrives at a node participating in a multi-slice
>     network, the packet needs to be treated and *routed* according to
>     the slice it belongs to. Because the physical data link over which
>     the packet has arrived could be used by more than one slices, the
>     packet needs to carry somewhere the slice ID. IMHO because the slice
>     topology may dynamically change, it would be simpler and cleaner to
>     carry the slice ID, rather than slice aggregate ID, as suggested by
>     the draft.
> 
> 
> [VPB] The packet needs to carry some identifier that would help 
> determine the specific forwarding treatment (scheduling and drop policy) 
> to be applied before the packet is forwarded further (this is not needed 
> in the "Control Plane Slice Policy" mode). In the model that is proposed 
> in the draft, we have one or more IETF Network Slices mapped onto a 
> single slice aggregate and each slice aggregate has a specific Per Hop 
> Behavior associated with it. In other words, the packet needs to carry 
> an identifier that maps onto the slice aggregate. Also note that in the 
> proposed model, multiple slice aggregates can map onto the same topology.
> 
> 
>     I also agree with Gyan that the COS field may not be the best choice
>     for the task.
> 
> 
> [VPB] I'm not sure what you mean by the COS field here.  If there is a 
> need to allow differentiation of forwarding treatments for packets 
> within a slice aggregate, the slice aggregate traffic may further carry 
> a Diffserv Class Selector.
> 
> 
>     Regards,
>     Igor
> 
>     Get Outlook for Android <https://aka.ms/ghei36>
>     ------------------------------------------------------------------------
>     *From:* Teas <teas-bounces@ietf.org <mailto:teas-bounces@ietf.org>>
>     on behalf of Vishnu Pavan Beeram <vishnupavan@gmail.com
>     <mailto:vishnupavan@gmail.com>>
>     *Sent:* Thursday, February 4, 2021 3:49:37 PM
>     *To:* Gyan Mishra <hayabusagsm@gmail.com <mailto:hayabusagsm@gmail.com>>
>     *Cc:* Tarek Saad <tsaad=40juniper.net@dmarc.ietf.org
>     <mailto:40juniper.net@dmarc.ietf.org>>;
>     draft-bestbar-teas-ns-packet@ietf.org
>     <mailto:draft-bestbar-teas-ns-packet@ietf.org>
>     <draft-bestbar-teas-ns-packet@ietf.org
>     <mailto:draft-bestbar-teas-ns-packet@ietf.org>>; TEAS WG
>     <teas@ietf.org <mailto:teas@ietf.org>>
>     *Subject:* Re: [Teas] FW: New Version Notification for
>     draft-bestbar-teas-ns-packet-01.txt
>     Gyan, Hi!
> 
>     Thanks for taking the time to review the document. Please see inline
>     for responses (prefixed VPB).
> 
>     Regards,
>     -Pavan (as a co-author)
> 
>     On Wed, Feb 3, 2021 at 8:14 PM Gyan Mishra <hayabusagsm@gmail.com
>     <mailto:hayabusagsm@gmail.com>> wrote:
> 
> 
> 
>         Dear authors
> 
>         I reviewed the draft and have some comments.
> 
>         I noticed the draft  name and throughout the document it
>         mentions Network Slice in IP/MPLS networks and wonder if it
>         would be more appropriate to say network slice in SR/MPLS
>         networks.  As NS involves traffic steering either RSVP-TE or SR
>         steering my thoughts are it would be appropriate
> 
> 
>     [VPB] I’m not sure if I understood the comment. As you are aware,
>     Segment Routing can be instantiated on MPLS or IPv6 dataplanes. The
>     solution proposed in draft-bestbar-teas-ns-packet is intended for
>     realizing network slicing in IP(v4/v6) / MPLS networks. The proposed
>     solution works with any type of path control technology (e.g.RSVP-TE
>     paths, SR paths, FlexAlgo paths). If you are interested in how the
>     proposed solution works in SR deployments, please refer to
>     draft-bestbar-spring-scalable-ns.
> 
> 
>         This drafts main focus it seems is an example of NS using QOS CS
>         selector marking Differential service to be used for network
>         slicing.
> 
> 
> 
>     [VPB] Not really. The focus in this document is on the Slice Policy
>     construct which includes rules that control the following slice
>     aggregate attributes:
>     - Data plane policies (Slice Selectors, QOS profiles)
>     - Control plane policies (Guaranteed BW, Reservation priorities)
>     - Topology membership policies (Customized/Pre-defined)
> 
>     There are 3 types of Slice Policy Modes depending on how/where the
>     shared network resources are partitioned –
>     (1) Data Plane Slice Policy Mode
>     (2) Control Plane Slice Policy Mode
>     (3) Data and Control Plane Slice Policy Mode
> 
>     In modes (1) and (3), a Slice Selector (SS) is carried in the packet
>     to identify the slice aggregate and apply specific forwarding
>     treatment (scheduling treatment and drop probability). But this is
>     not needed in mode (2).
> 
>         In my mind QOS is completely orthogonal to the concept of
>         network slicing.  QOS involves shared resources and traffic
>         classification and scheduling based on shared pipe resources
>         which is completely orthogonal to network slicing which is a
>         cross section of underlying resources involving a degree of
>         isolation during provisioning to meet a customer  SLA.  QOS has
>         been around for a long time and the big downside to QOS is that
>         it is independent of underlying network resources.
> 
>         When QOS PHB scheduling occurs based on CS AF or EF selector,
>         packet are marked at the edge of trust boundary and PHB hop by
>         hop scheduled matching dscp value providing bandwidth guarantees
>         for profile traffic at or below the scheduling bandwidth which
>         is based on the shared physical link.
> 
> 
> 
>     [VPB] As noted above, it is certainly possible for a network slicing
>     solution to be put together without requiring a specific
>     per-hop-behavior to be applied on packets belonging to a slice
>     aggregate (we refer to this as “Control Plane Slice Policy Mode” -
>     Section 4.2 of draft-bestbar-teas-ns-packet-01). However, there are
>     cases where the Slice service requires strict QOS guarantees and
>     differentiation from other traffic – this is where the Data Plane
>     Slice Policy Mode comes into play.
> 
>         Kind Regards
> 
>         Gyan
> 
> 
>         On Tue, Dec 22, 2020 at 1:59 PM Tarek Saad
>         <tsaad=40juniper.net@dmarc.ietf.org
>         <mailto:40juniper.net@dmarc.ietf.org>> wrote:
> 
>             Hi WG,____
> 
>             __ __
> 
>             We have published a new revision of this draft (just in time
>             for your holidays reading).____
> 
>             The changes include:____
> 
>               * additional co-authors have joined____
>               * introduction of new terms “slice policy” and “slice
>                 aggregate”____
>               * editorial nits to align with new terms introduced____
> 
>             __ __
> 
>             As usual, reviews and comments are welcome.____
> 
>             __ __
> 
>             Regards,____
> 
>             Tarek (on behalf of co-authors)____
> 
>             __ __
> 
>             __ __
> 
>             On 12/22/20, 1:42 PM, "internet-drafts@ietf.org
>             <mailto:internet-drafts@ietf.org>" <internet-drafts@ietf.org
>             <mailto:internet-drafts@ietf.org>> wrote:____
> 
>             __ __
> 
>                  [External Email. Be cautious of content]____
> 
>             __ __
> 
>             __ __
> 
>                  A new version of I-D,
>             draft-bestbar-teas-ns-packet-01.txt____
> 
>                  has been successfully submitted by Tarek Saad and
>             posted to the____
> 
>                  IETF repository.____
> 
>             __ __
> 
>                  Name:           draft-bestbar-teas-ns-packet____
> 
>                  Revision:       01____
> 
>                  Title:          Realizing Network Slices in IP/MPLS
>             Networks____
> 
>                  Document date:  2020-12-22____
> 
>                  Group:          Individual Submission____
> 
>                  Pages:          27____
> 
>                  URL:
>             https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-bestbar-teas-ns-packet-01.txt__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPzvuhQQRw$
>             <https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-bestbar-teas-ns-packet-01.txt__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPzvuhQQRw$>____
> 
>                  Status:
>             https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-bestbar-teas-ns-packet/__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPwWnIEvoQ$
>             <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-bestbar-teas-ns-packet/__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPwWnIEvoQ$>____
> 
>                  Htmlized:
>             https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-bestbar-teas-ns-packet__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPxBddbTdg$
>             <https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-bestbar-teas-ns-packet__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPxBddbTdg$>____
> 
>                  Htmlized:
>             https://urldefense.com/v3/__https://tools.ietf.org/html/draft-bestbar-teas-ns-packet-01__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPznNKoLDg$
>             <https://urldefense.com/v3/__https://tools.ietf.org/html/draft-bestbar-teas-ns-packet-01__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPznNKoLDg$>____
> 
>                  Diff:
>             https://urldefense.com/v3/__https://www.ietf.org/rfcdiff?url2=draft-bestbar-teas-ns-packet-01__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPzsN9oeaw$
>             <https://urldefense.com/v3/__https://www.ietf.org/rfcdiff?url2=draft-bestbar-teas-ns-packet-01__;!!NEt6yMaO-gk!UopixISsH-6laFtUNIg5vIaLsXzFthS8C65TCDCRk-5ayO6AAa-8IPzsN9oeaw$>____
> 
>             __ __
> 
>                  Abstract:____
> 
>                     Network slicing provides the ability to partition a
>             physical network____
> 
>                     into multiple logical networks of varying sizes,
>             structures, and____
> 
>                     functions so that each slice can be dedicated to
>             specific services or____
> 
>                     customers.  Network slices need to operate in
>             parallel while____
> 
>                     providing slice elasticity in terms of network
>             resource allocation.____
> 
>                     The Differentiated Service (Diffserv) model allows
>             for carrying____
> 
>                     multiple services on top of a single physical
>             network by relying on____
> 
>                     compliant nodes to apply specific forwarding
>             treatment (scheduling____
> 
>                     and drop policy) on to packets that carry the
>             respective Diffserv____
> 
>                     code point.  This document proposes a solution based
>             on the Diffserv____
> 
>                     model to realize network slicing in IP/MPLS
>             networks.____
> 
>             __ __
> 
>             __ __
> 
>             __ __
> 
>             __ __
> 
>                  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 <http://tools.ietf.org>.____
> 
>             __ __
> 
>                  The IETF Secretariat____
> 
>             __ __
> 
>             __ __
> 
> 
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> 
>         -- 
> 
>         <http://www.verizon.com/>
> 
>         *Gyan Mishra*
> 
>         /Network Solutions A//rchitect /
> 
>         /M 301 502-1347
>         13101 Columbia Pike
>         /Silver Spring, MD
> 
> 
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