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Re: [spring] PSP and a logical application of RFC8200

"Darren Dukes (ddukes)" <ddukes@cisco.com> Mon, 02 March 2020 21:10 UTC

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From: "Darren Dukes (ddukes)" <ddukes@cisco.com>
To: Fernando Gont <fgont@si6networks.com>
CC: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>, 6man WG <ipv6@ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: PSP and a logical application of RFC8200
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Date: Mon, 02 Mar 2020 21:09:54 +0000
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References: <39544C17-1AD0-412E-A8BD-E17376537FCF@cisco.com> <bf9d68e6-cbae-2b19-11e0-1e452f0bf654@gmail.com> <FD806998-8218-4C70-B383-332C5F934A73@cisco.com> <cd7cbeef-d502-20d8-fdd6-ba8473acb6fd@si6networks.com>
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Subject: Re: [spring] PSP and a logical application of RFC8200
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Fernando, you are wrong.  SRH processing only occurs at the segment endpoint, there is no "processing the routing header again”.

Darren


> On Mar 2, 2020, at 3:45 PM, Fernando Gont <fgont@si6networks.com> wrote:
> 
> On 2/3/20 17:02, Pablo Camarillo (pcamaril) wrote:
>> Brian,
>> The PSP pseudocode is presented as a modification to the End pseudocode starting at line S14 of such.
>> Please go through the PSP pseudocode in conjunction with the End pseudocode (Section 4.1).
>> You will see that the ingress state of the packet is (Segments Left == 1 and Destination Address == the PSP node's address).
> 
> You are also changing the semantics of routing headers: if you prcessed the RH when Segments Left == N, you don't get to decrement SegmentsLeft and process the routing header again.
> 
> So, again, you should be updating RFC8200, and probably even the segment-routing-header I-D.
> 
> Thanks,
> -- 
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
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> 
> 
>

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