Re: [Lsr] [spring] clarification of END Point behavior in draft-ietf-spring-srv6-network-programming

Parag Kaneriya <pkaneria@juniper.net> Mon, 06 July 2020 09:16 UTC

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From: Parag Kaneriya <pkaneria@juniper.net>
To: "lsr@ietf.org" <lsr@ietf.org>, SPRING WG <spring@ietf.org>
Thread-Topic: Re: [spring] [Lsr] clarification of END Point behavior in draft-ietf-spring-srv6-network-programming
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Date: Mon, 6 Jul 2020 09:16:35 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/32CW79Vvemhz8qkPNbF98E3j6OY>
Subject: Re: [Lsr] [spring] clarification of END Point behavior in draft-ietf-spring-srv6-network-programming
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Hello,

I am going through recent draft https://tools.ietf.org/pdf/draft-ietf-spring-srv6-network-programming-16.pdf

Changes are follow ,

4.1. End: Endpoint

S01. When an SRH is processed {
S02. If (Segments Left == 0) {
S03. Proceed to process the next header in the packet, whose type is identified by the Next Header field in the routing header.
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. }


With these change, I have below few question


  1.  Can END SID can be last SID of the SID list ?   earlier draft (not sure which version), it was explicitly mentioned that last SID can't be END sid ( Most basic flavors ).
  2.  IF yes then When/Who will remove the SRH header when last sid is END SID in the sid list.

Regards
Parag


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