Re: [Idr] Working group last call for draft-ietf-idr-tunnel-encaps-04

[<[e-mail]>]

> From: Eric C Rosen [mailto:[e-mail]]   > Sent: Tuesday, June 27, 2017 4:56 PM
> 
 > On 6/23/2017 6:56 AM, [e-mail] wrote:
 > > I wouldn't said that I have reviewed the document (-06), nor the discussion, but section
 > 3.3.1 " IPv4 DS Field" seems IPv4 specific and we probably need to also cover IPv6. Possibly,
 > the same sub-TLV may be used.
 > > In addition, there is the IPv6 flow label, but I don't know whether it would be useful to
 > specify it or not.
 > 
 > It's impossible for a single document to specify a sub-TLV for every
 > encapsulation header field that might possibly be useful.  I tried to
 > include in the document enough of a selection of sub-TLVs to indicate
 > how more might be added.  If someone wants to signal a value for the
 > IPv6 flow label field, it should be fairly straightforward to write a
 > draft specifying a suitable sub-TLV.

Fair point for the IPv6 flow label.

I don't think the argument work for making the "IPv4 DS Field" IPv4 specific with no provision for IPv6. I see 3 options to cover IPv6:
- one sub-TLV IP version agnostic
- two  2 sub-TLVs IPv4 QoS, IPv6 QoS
- if only one IP version specific sub-TLV can be defined, we may want it to be IPv6 rather than IPv4.

If it's impossible, I guess we can also remove the QoS field. 

--Bruno
 


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