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[spring] Some questions regarding Replication SID

Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Tue, 15 October 2019 13:31 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>, "cfilsfil@cisco.com" <cfilsfil@cisco.com>, "riparekh@cisco.com" <riparekh@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Some questions regarding Replication SID
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Date: Tue, 15 Oct 2019 13:30:49 +0000
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Subject: [spring] Some questions regarding Replication SID
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Dear colleagues,
I have read the Replication SID draft<https://tools.ietf.org/html/draft-voyer-spring-sr-replication-segment-00>, and I have a few questions dealing with possible instantiation of the Replication SOD in SR-MPLS<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-22>.


1.       The draft says that "each branch is abstracted to a <Downstream Node, Downstream Replication-SID>".  Does that mean that the Downstream Replication-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://tools.ietf.org/html/rfc8402>?

2.       The draft also says that "A Replication branch to a particular Downstream Node could be represented by the node's Node SID".  Does this mean that the Replication Node sends the packets it receives with the Replication SID as the active segment with the labels representing the downstream Node SID as the active segment across such a replication branch?

3.       The draft also says that "Replication segment is instantiated at Downstream nodes and at the Replication node".  Does that mean that the list of SIDs associated with the specific replication Branch is pushed by the Replication Node on top of the label representing the Replication SID in the Downstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nodes downstream-allocated by these nodes or upstream-allocated by the replication node?

5.       The draft also says that  "A Replication segment can be either provisioned locally on a node or programmed by a PCE". These two options look exactly the same to me from the POV of the node on which the Replication segment is programmed - what, if anything, did I miss?

6.       Did you consider a possibility of advertising the Replication Segment from the Downstream nodes to the Replication one using some multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
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Email:   Alexander.Vainshtein@ecitele.com


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