Re: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-05.txt

["Pablo Camarillo (pcamaril)" <[e-mail]>]

Ravi,

Many thanks for your email.
I acknowledge that this is an editorial error which was not present in previous versions of the document. I will take care of it in the next revision of the draft.

Thanks,
Pablo.

From: Ravi M R <[e-mail]>
Date: Thursday, 28 November 2019 at 10:44
To: "Pablo Camarillo (pcamaril)" <[e-mail]>, "[e-mail]" <[e-mail]>
Cc: draft-ietf-spring-srv6-network-programming <[e-mail]>
Subject: RE: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-05.txt
Resent from: <[e-mail]>
Resent to: <[e-mail]>, <[e-mail]>, <[e-mail]>, <[e-mail]>, <[e-mail]>, <[e-mail]>
Resent date: Thursday, 28 November 2019 at 10:44


Authors,

Intent in section 4.16.2, for USP, seems to pop SRH and process IPv6 packet.

However text in draft does not match with the intention. Text says to substitute S02-S04 with given instructions.



4.16.2.  USP: Ultimate Segment Pop of the SRH



   The SRH processing of the End, End.X and End.T behaviors are

   modified: the instructions S02-S04 are substituted by the following

   ones:



   S02.   If (Segments Left == 0) {

   S03.       Pop the SRH

   S04.   }



If you just follow text in draft and replace S02-S04 in full set of instructions (copied below), we may execute some unwanted instructions like S09-S11, S13, S14. Could you update the text in the section so that draft is accurate.



  S01. When an SRH is processed {

  S02.   If (Segments Left == 0) {

  S03.      Send an ICMP Parameter Problem message to the Source Address

               Code TBD-SRH (SR Upper-layer Header Error),

               Pointer set to the offset of the upper-layer header,

               interrupt packet processing and discard the packet

  S04.   }

  S05.   If (IPv6 Hop Limit <= 1) {

  S06.      Send an ICMP Time Exceeded message to the Source Address,

               Code 0 (Hop limit exceeded in transit),

               interrupt packet processing and discard the packet

  S07.   }

  S08.   max_LE = (Hdr Ext Len / 2) - 1

  S09.   If ((Last Entry > max_LE) or (Segments Left > Last Entry+1)) {

  S10.      Send an ICMP Parameter Problem to the Source Address,

               Code 0 (Erroneous header field encountered),

               Pointer set to the Segments Left field,

               interrupt packet processing and discard the packet

  S11.   }

  S12.   Decrement Hop Limit by 1

  S13.   Decrement Segments Left by 1

  S14.   Update IPv6 DA with Segment List[Segments Left]

  S15.   Resubmit the packet to the egress IPv6 FIB lookup and

            transmission to the new destination

  S16. }





Thanks & Regards,

Ravi



-----Original Message-----
From: spring <[e-mail]> On Behalf Of Pablo Camarillo (pcamaril)
Sent: Friday, October 25, 2019 3:04 PM
To: [e-mail]
Cc: draft-ietf-spring-srv6-network-programming <[e-mail]>
Subject: Re: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-05.txt



Hi all,

We have just posted a new revision of draft-ietf-spring-srv6-network-programming.

This is a minor update with a clarification on the ethernet frames encapsulation and a fix to an editorial typo on the USD flavor.

Cheers,

Pablo.



-----Original Message-----

From: spring <[e-mail]<mailto:[e-mail]>> on behalf of "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>> Reply to: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>

Date: Friday, 25 October 2019 at 11:31

To: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>

Cc: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>

Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-05.txt





    A New Internet-Draft is available from the on-line Internet-Drafts directories.

    This draft is a work item of the Source Packet Routing in Networking WG of the IETF.



            Title           : SRv6 Network Programming

            Authors         : Clarence Filsfils

                              Pablo Camarillo Garvia

                              John Leddy

                              Daniel Voyer

                              Satoru Matsushima

                              Zhenbin Li

    Filename        : draft-ietf-spring-srv6-network-programming-05.txt

    Pages           : 41

    Date            : 2019-10-25



    Abstract:

       This document describes the SRv6 network programming concept and its

       most basic functions.







    The IETF datatracker status page for this draft is:

    https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/__;!8WoA6RjC81c!QV-W5MyGww8YIhsWimjZGLhx9-DAxYsI98IjcWlu52My2A_2qXS3Ykt6ThDvd3A$<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/__;!8WoA6RjC81c!QV-W5MyGww8YIhsWimjZGLhx9-DAxYsI98IjcWlu52My2A_2qXS3Ykt6ThDvd3A$>



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