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[tsvwg] Re: NQB claim of DSCP-

"Livingood, Jason" <jason_livingood@comcast.com> Fri, 31 May 2024 19:24 UTC

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From: "Livingood, Jason" <jason_livingood@comcast.com>
To: Sebastian Moeller <moeller0=40gmx.de@dmarc.ietf.org>
Thread-Topic: [tsvwg] Re: NQB claim of DSCP-
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Date: Fri, 31 May 2024 19:24:18 +0000
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Subject: [tsvwg] Re: NQB claim of DSCP-
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On 5/31/24, 03:10, "Sebastian Moeller" <moeller0=40gmx.de@dmarc.ietf.org <mailto:40gmx.de@dmarc.ietf.org>> wrote:
>>> We can easily see that my ISP (O2/Telefonica) does not remark DSCP decimal 45 (they do remap tos 192 (CS6) and tos 224 (CS7) but I assume that these DSCPs are used in the O2 network itself;
>> [JL] I wonder if that is unintentional - it would be great to pull in a Telefonica network engineer to see.

> [SM] Good question, curious to hear some answer to that one. What makes you believe that this might not be intended? 

[JL] Because I have seen many examples over the years where people claim we're doing X or Y due to some presumed policy decision only to find it is an error or something missing in a config on a limited number of devices. 

> Look, I understand that DSCPs do not currently traverse the internet reliably and robustly, but that is not the same as a reliable neutering of NQB over not NQB-aware paths. Delegating safety tor accidental configurations (that are not really aligned with IETF recommendations) seems neither robust nor reliable to me.

[JL] My observation as an operator is that every other network with which we connect is bleaching our inbound DSCP marks. That is one of the things that will make NQB challenging; we need to get networks to allow 45 marking inbound - so NQB will likely take more time for adoption that L4S, since in most cases ECN is not bleached on ingress.

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