[spring] Re: [EXTERNAL] Re: My question at the mike about draft-dong-spring-srv6-inter-layer-programming

[Alexander Vainshtein <[e-mail]>]

Ktan, and all,
My personal summary of what you and I have said is lie following:

  *   Without L3 functionality on the endpoints of an underlay link between a pair of IP nodes, it will not pass IP traffic
  *   With some form of L3 functionality on the endpoints of an underlay link between a pair of IP nodes regular End.X SIDs suffice

What, if anything, do I miss?

Regards,
Sasha

From: Ketan Talaulikar <[e-mail]>
Sent: Friday, July 26, 2024 2:47 PM
To: Alexander Vainshtein <[e-mail]>
Cc: [e-mail]; [e-mail]
Subject: [EXTERNAL] Re: [spring] My question at the mike about draft-dong-spring-srv6-inter-layer-programming

Adding to what Sasha has said, RFC8986 that has specified End.X (refer https://www.rfc-editor.org/rfc/rfc8986.html#section-4.2<https://www.rfc-editor.org/rfc/rfc8986.html#section-4.2>) also allows for the same to be used for the underlying L2 bundle member links as well.

To me, the L3 interface with optical sub-channels under it, seems similar and makes me also wonder (same as Sasha) about why End.X is not sufficient.

Thanks,
Ketan


On Fri, Jul 26, 2024 at 2:28 PM Alexander Vainshtein <Alexander.Vainshtein=[e-mail]<mailto:[e-mail]>> wrote:
Hi all,
Just repeating the question about the draft<https://datatracker.ietf.org/doc/html/draft-dong-spring-srv6-inter-layer-programming-08> I’ve asked at he mike at the SPRING WG session today.


· Suppose that there is an underlay link between a pair of IP nodes  that is not “visible in he L3 topology”. To me this means that there no P-capable (logical) interfaces associated with the endpoints of this underlay link

· Suppose further that one of these nodes (the upstream one) allocates and advertises an SID with End.XU behavior for this underlay link

· The upstream node receives an IPv6 packets with the tops SRv6 SID on it being the End.XU. It strips this SID (this the common behavior of all End-like SIDs) and send the resulting IPv6 packet across the link to the downstream node/\.
Now the question: How should the downstream node process the received packet if its local endpoint of the undelay link s not associated with an IP-capable logical interface?

If the endpoints of the underlay ink are associated with L3 interfaces in both nodes, the link becomes visible in L3 topology, and a regular End.X SID can be allocated and advertised for it.

Hopefully this clarifies my question.

Regards,
Sasha



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