John Scudder has entered the following ballot position for
draft-ietf-ipsecme-labeled-ipsec-11: No Objection

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COMMENT:
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# John Scudder, RTG AD, comments for draft-ietf-ipsecme-labeled-ipsec-11
CC @jgscudder

Thanks for this document. I have just one comment.

## COMMENTS

I agree with Rob Wilton's point (4), about specifying things only once. The
place I bumped into this was that Section 2.2 says,

   The TS_SECLABEL Traffic Selector Type MUST NOT be the only TS_TYPE
   present in the TS payload.  If a TS payload is received with only
   TS_SECLABEL Traffic Selector types, an Error Notify message
   containing TS_UNACCEPTABLE MUST be returned.

whereas Section 3 says,

   TS_SECLABEL MUST NOT be used without another TS_TYPE in a Traffic
   Selector Payload, as it does not specify a complete set of traffic
   selectors on its own.  TS_SECLABEL is complimentary to another type
   of Traffic Selector.  There MUST be an IP address Traffic Selector
   type in addtion to the TS_SECLABEL Traffic Selector type in the
   Traffic Selector Payload.

The re-specification in Section 3 seems potentially problematic in that it
introduces a restriction not in the Section 2.2 text. That is, 2.2 says only
that TS_SECLABEL can't appear naked, whereas 3 says that it MUST be accompanied
by an IP address Traffic Selector type. Possibly this could be viewed as an
irrelevant difference, but (a) might there be other selector types introduced
in the future, that would sufficiently contextualize TS_SECLABEL without the
presence of an IP address selector, and (b) TS_FC_ADDR_RANGE is a thing?

Please consider specifying this only once. My impulse would be to remove the
quoted paragraph from Section 3 but what do I know?

### NITS

In the second quote above, s/addtion/addition/

## Notes

This review is in the ["IETF Comments" Markdown format][ICMF], You can use the
[`ietf-comments` tool][ICT] to automatically convert this review into
individual GitHub issues.

[ICMF]: https://github.com/mnot/ietf-comments/blob/main/format.md
[ICT]: https://github.com/mnot/ietf-comments



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