Hi all,
More questions regarding the definition of the Replication State of a
Replication Segment:
The draft states that:
If a Downstream Node is an egress (aka leaf) of the multi-point service, i.e.
no further replication is needed, then that leaf node's Replication segment
will not have any Replication State...
IMHO this is not aligned with the definition of the elements of the Replication
Segment (already quoted below) and Replication State. It would be more
appropriate to express the behavior of a Leaf node by stating that its
Replication state (defined as quoted below) is an empty list of branches.
With this approach a Replication SID of a bud node of a service could be
defined as an SID with the Replication state including, as one of the
branches - but not the only branch in the list - a Replication SID with itself
as the Node-ID and with an empty list of branches.
Regards,
Sasha
From: Alexander Vainshtein
Sent: Sunday, December 11, 2022 12:54 PM
To: draft-ietf-spring-sr-replication-segment.auth...@ietf.org
Cc: p...@ietf.org; spring-cha...@ietf.org; SPRING WG <spring@ietf.org>; James
Guichard <james.n.guich...@futurewei.com>; Nitsan Dolev
<nitsan.do...@rbbn.com>; Michael Gorokhovsky <michael.gorokhov...@rbbn.com>;
Nitsan Dolev <nitsan.do...@rbbn.com>; Michael Gorokhovsky
<michael.gorokhov...@rbbn.com>; Ron Sdayoor <ron.sday...@rbbn.com>
Subject: RE: WGLC for draft-ietf-spring-sr-replication-segment
Hi all,
I have a technical question on the following aspect of the SR Replication
Segment for Multi-point Service Delivery
draft<https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-replication-segment-10#name-replication-segment>.
The draft states that:
A Replication segment is identified by the tuple <Replication-ID, Node-ID>,
where:
* Replication-ID: An identifier for a Replication segment that is unique
in context of the Replication Node.
* Node-ID: The address of the Replication Node that the Replication
segment is for. Note that the root of a multi-point service is also a
Replication Node.
A Replication segment includes the following elements:
* Replication SID: The Segment Identifier of a Replication segment. This
is a SR-MPLS label or a SRv6 SID
[RFC8402<https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-replication-segment-10#RFC8402>].
* Downstream Nodes: Set of nodes in Segment Routing domain to which a
packet is replicated by the Replication segment.
* Replication State: See below.
Replication State is a list of replication branches to the Downstream Nodes. In
this document, each branch is abstracted to a <Downstream Node, Downstream
Replication SID> tuple.
My question is:
Can the same "Downstream Replication ID in a given "Downstream Node" be
included/ in the Replication state of multiple Replication segments, especially
of Replication segments identified by different Node IDs?
I have not found any answer to this question in the text of the draft. At the
same time I think that a positive answer to my question would contradict the
definitions in Section 3.1 of the MVPN and EVPN with SR P2MP and Ingress
Replication
draft<https://datatracker.ietf.org/doc/html/draft-ietf-bess-mvpn-evpn-sr-p2mp-06#name-mpls-label>
because these definitions assume that the Replication SID can be used as the
"context label" for resolving the context label space space for looking up the
upstream allocated label advertised in the PTA attribute of the suitable
Mutlicast VPN route (in the case of aggregated P-tunnels).
IMHO and FWIW an explicit and unambiguous answer to my question should be
provided by the authors in order to advance the draft.
Regards, and lots of thanks in advance,
Sasha
Regards,
Sasha
From: spring <spring-boun...@ietf.org<mailto:spring-boun...@ietf.org>> On
Behalf Of James Guichard
Sent: Tuesday, October 18, 2022 6:18 PM
To: SPRING WG <spring@ietf.org<mailto:spring@ietf.org>>
Cc: p...@ietf.org<mailto:p...@ietf.org>;
spring-cha...@ietf.org<mailto:spring-cha...@ietf.org>
Subject: [EXTERNAL] [spring] WGLC for draft-ietf-spring-sr-replication-segment
Dear WG:
This email starts a 3 week Working Group Last Call for
draft-ietf-spring-sr-replication-segment [1].
Please read this document if you haven't read the most recent version and send
your comments to the SPRING WG list no later than November 6th 2022.
If you are raising a point which you expect will be specifically debated on the
mailing list, consider using a specific email/thread for this point.
Lastly, if you are an author or contributor please response to indicate whether
you know of any undisclosed IPR related to this document.
Thanks!
Jim, Joel & Bruno
[1]
https://datatracker.ietf.org/doc/draft-ietf-spring-sr-replication-segment/<https://clicktime.symantec.com/15sLvRMR98Uy4qFgjBRVq?h=BxqfSEE4yhnFTweS-HkSx6apYbqZcVz9G_EXdBH6dp8=&u=https://datatracker.ietf.org/doc/draft-ietf-spring-sr-replication-segment/>
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