[mpls] Re: Ketan Talaulikar's No Objection on draft-ietf-mpls-spring-lsp-ping-path-sid-10: (with COMMENT)

[[e-mail]]

Hi Ketan,

Thank you for the prompt response.
Please see inline.

Original


From: KetanTalaulikar <[e-mail]>
To: 肖敏10093570;
Cc: [e-mail] <[e-mail]>;[e-mail] <[e-mail]>;[e-mail] <[e-mail]>;[e-mail] <[e-mail]>;[e-mail] <[e-mail]>;
Date: 2025年05月29日 14:39
Subject: Re: Ketan Talaulikar's No Objection on draft-ietf-mpls-spring-lsp-ping-path-sid-10: (with COMMENT)

Hi Xiao Min,
 
This is about the only remaining point. The other one is left to the WG.
 
As clarified by you, there is a data plane and control plane aspect. My
concern is that the current text is half baked as it references only the
(data plane) verification of PSID reaching the tailend but not the rest
about validating the context associated with that PSID (i.e., the control
plane part). Do you see a problem in updating the text to clarify what you
stated in your response below?
 [XM]>>> This part of text was first added by me and then improved by Med to address his another DISCUSS point.
NEW text that was added by me:
Among them,checking correct operation of the PSID means that the initiator can useLSP Ping to check whether the PSID reached the responder and got processedby the responder correctly; verifying the PSID against the control planemeans that the initiator can use LSP Ping to verify whether the responderhas the same understanding with the initiator on how the PSID was constructedby the control plane.NEW text that was proposed by Med:
Checking correct operation means that   an initiator can use LSP Ping to check whether a PSID reached the intended node and got processed   by that node correctly. Moreover, verifying a PSID against the control plane   means that the initiator can use LSP Ping to verify whether a given node has the same understanding with the initiator on how the PSID was constructed   by the control plane.Overall, this part of text contains two sentences, one is to clarify the check of the data plane, another is to clarify the verification of the data plane against the control plane.

Cheers,
Xiao Min


Thanks,
Ketan
 
 
On Thu, May 29, 2025 at 11:59 AM <[e-mail]> wrote:
 
> Hi Ketan,
> 
> 
> Thank you for the prompt reply.
> 
> Please see inline with [XM-2]>>>.
> Original
> *From: *KetanTalaulikar <[e-mail]> 
> *To: *肖敏10093570;
> *Cc: *[e-mail] <[e-mail]>;
> [e-mail] < 
> [e-mail]>;[e-mail] < 
> [e-mail]>;[e-mail] <[e-mail]>;[e-mail] < 
> [e-mail]>;
> *Date: *2025年05月29日 12:59
> *Subject: **Re: Ketan Talaulikar's No Objection on
> draft-ietf-mpls-spring-lsp-ping-path-sid-10: (with COMMENT)*
> Hi Xiao Min,
> 
> Thanks for your quick response. Please check inline below for my
> follow-up/clarification. I've trimmed out the parts where we have converged
> 
> [XM-2]>>> The following text was truncated by my mailbox, so pasted from
> MPLS archive.
> 
> On Thu, May 29, 2025 at 7:52 AM <[e-mail]> wrote:
> 
> > Hi Ketan,
> > 
> > 
> > Thanks for clearing your DISCUSS and carefully reviewing the -10 version.
> > 
> > I've posted a new -11 version attempting to address your comments. Link as
> > below.
> > 
> > 
> > <https://datatracker.ietf.org/doc/html/draft-ietf-mpls-spring-lsp-ping-path-sid-11> 
> > https://datatracker.ietf.org/doc/html/draft-ietf-mpls-spring-lsp-ping-path-sid-11> 
> > 
> >  < trimmed > 
> 
> 100        verify the PSID against the control plane.  Checking correct
> > 
> > 101        operation means that an initiator can use LSP Ping to check whether a
> > 102        PSID reached the intended node and got processed by that node
> > 103        correctly.  Moreover, verifying a PSID against the control plane
> > 
> > 
> > <major> PSID is not about getting to the correct endpoint/tailend node. That
> > 
> > is the property of the Node SID of that node. The PSID is about identification
> > of the correct context of the SR Path on that endpoint/tailend node - is it
> > matching the correct SL, CP, or SR Policy.
> > 
> > [XM]>>> I would argue that comparing to a data packet carrying PSID, an
> > LSP Ping packet carrying PSID can be used differently, because for LSP Ping
> > there is a query/response mechanism. I suggest to remain the text as is