Re: [spring] The SPRING WG has placed draft-voyer-spring-sr-replication-segment in state "Candidate for WG Adoption"

Sasha,

If I have some content and I send it to you and your neighbour as two
unicast streams am I suddenly doing multicast ?

IMHO N number of replicated unicasts is still not a multicast.

Multicast in my definition requires  multicast groups, receiver joins, tree
building protocols etc ... and this draft does not suggest any of this. IN
contrast it just describes how can we have p2mp unicast distribution ...
call it fan out node.

Thx,
R.

On Wed, Nov 13, 2019 at 12:42 PM Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

> Hi all,
>
> I have a question regarding adoption of
> draft-voyer-sr-spring-replication-segment as a SPRING WG document.
>
>
>
> These concerns are based on the following:
>
> 1.       This draft (both based on its title and on its content) deals
> with local (in the Root node) ingress replication which, in its turn, is
> one of the issues that could be used for delivery of multicast.
>
> 2.       Local ingress replication is mentioned in the SPRING WG Charter
> as one of the “New types of segments mapping to forwarding behavior”. The
> charter further says that “Any of the above <*Sasha: New types of
> segments*> may require architectural extensions”
>
> 3.       The current (and, AFAIK, the only existing) Segment Routing
> Architecture document (RFC 8402 <https://tools.ietf.org/html/rfc8402>)
> explicitly states in Section 6 that “Segment Routing is defined for
> unicast. The application of the source-route concept to Multicast is not in
> the scope of this document”.
>
> The combinations of observations above strongly suggests to me that a
> document defining multicast-related extensions of segment routing
> architecture should be very useful (if not mandatory) for progressing the
> Replication Segment draft. From my POV the Replication Segment draft is not
> (and is not intended to be) such a document.
>
>
>
> I wonder if there is an intention to produce such a document in the
> timeframe that could be relevant for discussion of the Replication Segment
> draft.
>
>
>
> Nothing in this message should be interpreted as my objection to (or
> support of) adoption of the Replication Segment draft as a WG document *per
> se*.
>
> Bit I find it difficult to take a position any which way without a clear
> and commonly agreed upon framework for multicast in segment routing.
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
>
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of IETF Secretariat
> Sent: Tuesday, November 12, 2019 7:06 PM
> To: draft-voyer-spring-sr-replication-segment@ietf.org;
> spring-chairs@ietf..org; spring@ietf.org
> Subject: [spring] The SPRING WG has placed
> draft-voyer-spring-sr-replication-segment in state "Candidate for WG
> Adoption"
>
>
>
>
>
> The SPRING WG has placed draft-voyer-spring-sr-replication-segment in
> state Candidate for WG Adoption (entered by Bruno Decraene)
>
>
>
> The document is available at
>
>
> https://clicktime.symantec.com/3EMJRgfTdX6UyWKGnMPiVwZ6H2?u=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-voyer-spring-sr-replication-segment%2F
>
>
>
> Comment:
>
> IPR call:
>
>
> https://clicktime.symantec.com/3KG7A2qM3Xf2eqDctGju1e66H2?u=https%3A%2F%2Fmailarchive.ietf.org%2Farch%2Fmsg%2Fspring%2F_stJjBM5K6vr7QYw0HRKf-z0_us
>
>
>
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