Re: Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming

Stefano Salsano <stefano.salsano@uniroma2.it> Thu, 27 February 2020 16:22 UTC

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Subject: Re: Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming
To: Fernando Gont <fernando@gont.com.ar>, Ted Lemon <mellon@fugue.com>, "Maojianwei (Mao)" <maojianwei@huawei.com>
Cc: SPRING WG List <spring@ietf.org>, "6man@ietf.org" <6man@ietf.org>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
References: <6B803B308679F94FBD953ABEA5CCCCD701089509@dggema524-mbx.china.huawei.com> <6E7A3022-DEC7-4E35-9A56-0F708CD41180@fugue.com> <58c706f7-2370-2b63-37df-0b5daf1ad8a5@gont.com.ar>
From: Stefano Salsano <stefano.salsano@uniroma2.it>
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Date: Thu, 27 Feb 2020 17:22:05 +0100
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Fernando,

Il 2020-02-27 12:11, Fernando Gont ha scritto:

[... removed non-technical discussion]

> One of their last inventions has been to pretend that IPv6 allows EH 
> insertion/deletion en-route, based on their reading of RFC8200. Based on 
> a curious interpretation of the text, they claim that each waypoint 
> (intermmediate router that received the packet because its address was 
> set as de Destination Address) can insert/remove EHs, and they claim 
> that that's not a violation of RFC8200.
> 
> However, the PSP behavour doesn't even fit in that fictional 
> interpretation of RFC8200.
> 
> What PSP does is that, given:
> 
>   ---- B ----- C
> 
> routers, when B realizes, after processing the SRH and setting the Dest 
> Addr to the last segment, SegmentsLeft==0, it removes the SRH.
> 
> This case is not even covered by their fictional interpretation of RFC8200.

router B receives a packet whose DA belongs to B

in the pseudo code router B sets the DA of the packet to C before 
removing the SRH, this is only the description of the internal 
processing that happens in the router

this does *NOT* mean that router B can remove an SRH in a received 
packet in which the DA belongs to C

Stefano

[... removed non-technical discussion]



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Stefano Salsano
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