Re: [tsvwg] Chairs slides for interim meeting

["Rodney W. Grimes" <[e-mail]>]

> David,
> 	A comment in line below about your Hint to RFC 4774.
> 
> > I've posted the chairs slides for the interim meeting on how we plan (hope?) to make progress in the interim meeting and at the Vancouver meeting.  They focus on ECT(1) usage.
> > 
> > These slides and the rest of the materials for the interim meeting are (and will be) posted here: https://datatracker.ietf.org/meeting/interim-2020-tsvwg-01/session/tsvwg
> > 
> > Hint: RFC 4774 "Specifying Alternate Semantics for the Explicit Congestion Notification (ECN) Field" is relevant background, especially Section 4.3 (Option 3:  Friendly Coexistence with Competing Traffic).
> 
> In reading RFC 4774 Section 4.3 at paragraph 9 we find:
>    A requirement for compatibility with end-nodes using default ECN is
>    that if a packet that *could* be using default semantics is marked
>    with the ECN codepoint "00", this marking must not be changed to
>    "01", "10", or "11" in the network.  This prevents the packet from
>    being represented incorrectly to a default-ECN router downstream as
>    ECN-Capable.  Similarly, if a packet that *could* be using default
>    semantics is marked with the ECN codepoint "01", then this codepoint
>    should not be changed to "10" in the network (and a "10" codepoint
>    should not be changed to "01").  This requirement is necessary to
>    avoid interference with the transport protocol's use of the ECN nonce
>    [RFC3540].
> 
> For this purposes of this "Hint" can we consider that paragraph
> to be stricken since RFC3540 and ECN nonce have been made historical
> in scope?

Correction, last 2 sentences stricken, not the whole paragraph.

> Further I note that this RFC and BCP does not have an update to it
> that would make the above paragraph obsolete, should something be
> done about that?  An errata?
> 
> 
> Thanks,
> Rod
> 
> > Thanks, --David (with apologies for extending the IETF practice of just-in-time slide preparation)
> > ----------------------------------------------------------------
> > David L. Black, Sr. Distinguished Engineer, Dell EMC
> > Dell Technologies, Infrastructure Systems Group
> > 176 South St., Hopkinton, MA  01748
> > [phone]<tel:[phone]>           Mobile: [phone]<tel:[phone]>
> > [e-mail]<mailto:[e-mail]>
> > ----------------------------------------------------------------
> -- 
> Rod Grimes                                                 [e-mail]
> 
> 

-- 
Rod Grimes                                                 [e-mail]