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Re: [Tsv-art] Tsvart early review of draft-ietf-trill-over-ip-10 - ECN & DSCP considerations

Wesley Eddy <wes@mti-systems.com> Wed, 12 July 2017 19:32 UTC

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From: Wesley Eddy <wes@mti-systems.com>
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Date: Wed, 12 Jul 2017 15:31:54 -0400
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Subject: Re: [Tsv-art] Tsvart early review of draft-ietf-trill-over-ip-10 - ECN & DSCP considerations
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On 7/1/2017 2:03 PM, Donald Eastlake wrote:
> On Sat, Jul 1, 2017 at 10:53 AM, Black, David <David.Black@dell.com> wrote:
>> Also, as noted earlier in this discussion, RFC 7657 explicitly discourages use of multiple DSCPs in a single TCP connection.  That needs to be reflected in the TCP encapsulation text in the trill-over-ip draft - in particular, the current text in Section 4.3 on mapping to DSCPs from TRILL priority and DEI does not appear to be consistent with RFC 7657 for TCP-based encapsulation.
> I'm surprised it only "discourages" rather than "prohibits"...
>
>

RFC 1122 section 4.2.4.2 might be of interest.

It says that TOS "SHOULD" be able to change during TCP connection 
lifetime.  The example given there is an SMTP connection whose nature 
might change during its lifetime.

I'm not saying whether or not this is really still a sensible concern, 
just pointing it out.

The change from TOS to DSCP terminology and semantics didn't make any 
change here as far as I can tell.

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