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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Greg, Please see inline. From: Greg Mirsky Sent: Wednesday, February 17, 2021 2:38 AM To: Bruno Decraene Cc: spring@ietf.org; draft-ietf-spring-nsh-sr@ietf.org Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr Dear All, I have several questions about the draft: * When using the approach described in Section 4, i.e., SR-based SFC wi= th the integrated NSH, how does a re-Classifier scenario be handled? If I u= nderstand it correctly, a re-Classifier can change the SPI of the NSH comin= g back from the SF. If that is the case, the SFF will not match it to the s= aved SR information because the SPI had changed. How would SFF forward the = NSH and the payload? Jim> A reclassification both in service chaining and segment routing means = that the original path is replaced by a new path. In this case a new SPI wo= uld forward the packet based upon the SFF lookup just like any other servic= e chain; the original path would be replaced and the network programmed to = support that new path based upon the policy action. Of course the network o= perator would need to program this in such a way that if necessary the orig= inal SR path (or parts thereof) are integrated into the new path. * Related to the scenario from the above. The stored SR information tha= t is not being used appears to become stale. It seems that it creates a lea= k of resources in a system that should be controlled somehow. Jim> yes you are right Greg and we probably need to add some text to suppor= t the caching operation which was also suggested by Dhruv in another email.= If you have any suggested text that would be great but I will also look in= to it. Regards, Greg On Tue, Feb 9, 2021 at 10:31 AM > wrote: Dear WG, This message starts a 2 weeks WG last call for draft-ietf-spring-nsh-sr [1]= . After review of the document please indicate whether you believe this docum= ent should be progressed to the IESG. In addition to yes/no, please consider providing a technical review of this= document; in particular if you care for this document. Indeed, since WG adoption, this document had benefited from little reviews = from the WG, so we need more review from the SPRING WG. If you are aware of an implementation of this document, please report the i= mplementation either on the list or to the chairs so that the shepherd can = report implementations in the writeup. Note that I'll forward that call to the SFC WG. Thanks! [1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr --Bruno ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. _______________________________________________ spring mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring --_000_MN2PR13MB420613FEF849F7E5F7A4BA9CD2529MN2PR13MB4206namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Greg,

 

Please see inline.

 

From: Greg Mirsky <gregimirsky@gmail.com&g= t;
Sent: Wednesday, February 17, 2021 2:38 AM
To: Bruno Decraene <bruno.decraene@orange.com>
Cc: spring@ietf.org; draft-ietf-spring-nsh-sr@ietf.org
Subject: Re: [spring] WG Last Call draft-ietf-spring-nsh-sr

 

Dear All,

I have several questions about the draft:=

  • When using the approach described in Section 4, i.e., SR-based SFC with the= integrated NSH, how does a re-Classifier scenario be handled? If I un= derstand it correctly, a re-Classifier can change the SPI of the NSH c= oming back from the SF. If that is the case, the SFF will not match it to the saved SR information because the SPI= had changed. How would SFF forward the NSH and the payload?

Jim> A reclassification both in service chaining and segment ro= uting means that the original path is replaced by a new path. In this case = a new SPI would forward the packet based upon the SFF lookup just like any other service chain; the original path w= ould be replaced and the network programmed to support that new path based = upon the policy action. Of course the network operator would need to progra= m this in such a way that if necessary the original SR path (or parts thereof) are integrated into the new path.<= o:p>

  • Related to the scenario from the above. The stored SR information that is n= ot being used appears to become stale. It seems that it creates a leak of r= esources in a system that should be controlled somehow.

    • Jim> yes you are right Greg and we probably need to add some te= xt to support the caching operation which was also suggested by Dhruv in an= other email. If you have any suggested text that would be great but I will also look into it.

    Regards,

Greg

 

On Tue, Feb 9, 2021 at 10:31 AM <bruno.decraene@orange.com> wrote:<= /o:p>

Dear WG,

 

This message starts a 2 weeks WG last call fo= r draft-ietf-sprin= g-nsh-sr [1].

After review of the document please indicate = whether you believe this document should be progressed to the IESG.<= span lang=3D"FR">

 

In addition to yes/no, please consider provid= ing a technical review of this document; in particular if you care for this= document.

Indeed, since WG adoption, this document had = benefited from little reviews from the WG, so we need more review from the = SPRING WG.

 

If you are aware of an implementation of this= document, please report the implementation either on the list or to the ch= airs so that the shepherd can report implementations in the writeup.

 

Note that I’ll forward that call to the= SFC WG.

 

Thanks!

 

[1] https://tools.ietf.org/html/draft-ietf-spring-nsh-sr<= /p>

 

--Bruno

 

____________________________________________________=
_____________________________________________________________________<=
/o:p>
 
Ce message et ses pieces jointes peuvent contenir de=
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a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.
 
This message and its attachments may contain confide=
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they should not be distributed, used or copied witho=
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If you have received this email in error, please not=
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Thank you.

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