[spring] SRV6 OAM (USP SID)

Rajesh M <mrajesh@juniper.net> Mon, 14 September 2020 09:36 UTC

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From: Rajesh M <mrajesh@juniper.net>
To: "Zafar Ali (zali)" <zali@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
CC: "G. Sri Karthik Goud" <gkarthik@juniper.net>, Deepti Rathi <deeptir@juniper.net>, SPRING WG <spring@ietf.org>
Thread-Topic: SRV6 OAM (USP SID)
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Date: Mon, 14 Sep 2020 09:36:07 +0000
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Subject: [spring] SRV6 OAM (USP SID)
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When ingress pings a USP SID, at the egress below code is executed.

4.16.2<https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-18#section-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) {

 S03.1.      Update the Next Header field in the preceding header to the

                Next Header value of the SRH

 S03.2.      Decrease the IPv6 header Payload Length by the Hdr Ext Len

                value of the SRH

 S03.3.      Remove the SRH from the IPv6 extension header chain

 S03.4.      Proceed to process the next header in the packet

 S04.     }


May be we should explicitly state here "if next header is Upper layer header then execute section 4.1.1"



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