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Re: [Detnet] IP Solution and use of DetNet-specific DSCPs (was Re: draft-ietf-detnet-architecture-10)

Balázs Varga A <balazs.a.varga@ericsson.com> Fri, 11 January 2019 09:36 UTC

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From: Balázs Varga A <balazs.a.varga@ericsson.com>
To: Norman Finn <norman.finn@mail01.huawei.com>, "Andrew G. Malis" <agmalis@gmail.com>, Lou Berger <lberger@labn.net>
CC: detnet WG <detnet@ietf.org>, Janos Farkas <Janos.Farkas@ericsson.com>, "Black, David" <David.Black@dell.com>
Thread-Topic: [Detnet] IP Solution and use of DetNet-specific DSCPs (was Re: draft-ietf-detnet-architecture-10)
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Date: Fri, 11 Jan 2019 09:36:43 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/Bs5lITUCm_vqMkYM0k2e6Iy3lwE>
Subject: Re: [Detnet] IP Solution and use of DetNet-specific DSCPs (was Re: draft-ietf-detnet-architecture-10)
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Hi Norm,

> 1. You may well need more than one DSCP for DetNet region for different classes of service.
Yes, and we have defined the 6-tupple match for flow identification, what allows multiple DSCP
values.

> 2. You don't want to discard unexpected packets with a DetNet DSCP -- you want to remark
> them to a non-DSCP code point.  Not good if configuring (or misconfiguring) a QoS feature
> destroys a bystander's connectivity.
That is an interesting topic. What do You mean by "unexpected packet"? If it breaks the
traffic profile we must drop. I am not sure remarking is a good idea. What do You mean by
"non-DSCP code point"?

General, I think configuration errors may destroy DetNet (and any other) flows connectivity.
We have to live with that. You can mitigate them e.g., by "proper maintenance procedures",
etc. That points to the importance of DetNet OAM being able to detect configuration (and
other) errors.

Cheers
Bala'zs

From: detnet <detnet-bounces@ietf.org> On Behalf Of Norman Finn
Sent: Monday, January 7, 2019 7:20 AM
To: Andrew G. Malis <agmalis@gmail.com>; Lou Berger <lberger@labn.net>
Cc: detnet WG <detnet@ietf.org>; Janos Farkas <Janos.Farkas@ericsson.com>; Black, David <David.Black@dell.com>
Subject: Re: [Detnet] IP Solution and use of DetNet-specific DSCPs (was Re: draft-ietf-detnet-architecture-10)

1. You may well need more than one DSCP for DetNet region for different classes of service.
2. You don't want to discard unexpected packets with a DetNet DSCP -- you want to remark them to a non-DSCP code point.  Not good if configuring (or misconfiguring) a QoS feature destroys a bystander's connectivity.

-- Norm

________________________________
From: detnet [detnet-bounces@ietf.org] on behalf of Andrew G. Malis [agmalis@gmail.com]
Sent: Monday, December 24, 2018 12:26 PM
To: Lou Berger
Cc: detnet WG; Black, David; János Farkas
Subject: Re: [Detnet] IP Solution and use of DetNet-specific DSCPs (was Re: draft-ietf-detnet-architecture-10)
Lou,

Thanks for following up.

Cheers,
Andy


On Mon, Dec 24, 2018 at 3:24 PM Lou Berger <lberger@labn.net<mailto:lberger@labn.net>> wrote:
Andy,

Just following up on one point on DetNet-specific DSCPs:

On 12/19/2018 1:11 PM, Andrew G. Malis wrote:
> In that case, the DetNet flows would most probably be a using
> DetNet-specific DSCP, and if the ingress interface isn't properly
> provisioned to know how to process packets with that DSCP, they'll at
> least be reduced to best-effort treatment.. We can also recommend that
> packets with DetNet-specific DSCPs be dropped if they arrive at an
> ingress interface that isn't otherwise provisioned to expect such packets.

While I personally think use of DSCPs will be useful in supporting
aggregated DetNet flows, the IP solution draft has no requirement that
operators or vendors restrict DetNet flows to a specific DSCP value.  --
I personally think this is an important design point.

Happy Holidays!

Lou

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