Re: [Detnet] Magnus Westerlund's Discuss on draft-ietf-detnet-mpls-over-udp-ip-07: (with DISCUSS)

Balázs Varga A <balazs.a.varga@ericsson.com> Wed, 02 December 2020 17:24 UTC

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To: Magnus Westerlund <magnus.westerlund@ericsson.com>, The IESG <iesg@ietf.org>
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Thread-Topic: [Detnet] Magnus Westerlund's Discuss on draft-ietf-detnet-mpls-over-udp-ip-07: (with DISCUSS)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/kQK4Y3BkxxvmxmeSHkK4fq8ZOOE>
Subject: Re: [Detnet] Magnus Westerlund's Discuss on draft-ietf-detnet-mpls-over-udp-ip-07: (with DISCUSS)
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Hi,

Chapter 5. of draft-ietf-detnet-mpls-over-udp-ip provides a _non-exhaustive_ list of control and management plane information. 
DetNet does not changes rules of rfc7510: if the exceptions listed in 3.1 of rfc7510 applies, then using zero checksum is allowed; 
otherwise not. 

A possible solution can be to add an additional information element to the list in chapter 5, which allow or not the usage of
zero-checksum.

Thanks & Cheers
Bala'zs


-----Original Message-----
From: detnet <detnet-bounces@ietf.org> On Behalf Of Magnus Westerlund via Datatracker
Sent: Wednesday, December 2, 2020 4:47 PM
To: The IESG <iesg@ietf.org>
Cc: eagros@dolby.com; detnet@ietf.org; draft-ietf-detnet-mpls-over-udp-ip@ietf.org; detnet-chairs@ietf.org
Subject: [Detnet] Magnus Westerlund's Discuss on draft-ietf-detnet-mpls-over-udp-ip-07: (with DISCUSS)

Magnus Westerlund has entered the following ballot position for
draft-ietf-detnet-mpls-over-udp-ip-07: Discuss

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for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-detnet-mpls-over-udp-ip/



----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

So there might be something missing here in regards to zero-checksum in UDP when using IPv6. So Section 3.1 in RFC 7510 discusses this for MPLS over UDP and have some considerations that needs to be done if one are intending to use zero checksum. To me it appears that DETNET flows can not be guaranteed to always fulfill these, and in case you think you can motivate it should probably be stated explicitly and normatively allow it. So if it can't be guaranteed to fulfill these requirements then the next question exists: Do the possibility to use zero-checksum for this flow become something the control plane needs to signal it?





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