Hello,

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and
sometimes on special request. The purpose of the review is to provide
assistance to the Routing ADs. For more information about the Routing
Directorate, please see:

  http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs,
it would be helpful if you could consider them along with any other
IETF Early Review/Last Call  comments that you receive, and strive to
resolve them through discussion or by updating the draft.

Document: draft-ietf-mpls-mna-hdr-04.txt
Reviewer: Acee Lindem
Review Date: 04/26/2024
IETF LC End Date: N/A - Early Review
Intended Status: Standards Track

Summary:
This abstract very succinctly summarises the draft as defining the the
MPLS Network Action (MNA) sub-stack solution for carrying Network Actions
and Ancillary Data in the label stack. The document is well-written
but one really needs to have read draft-ietf-mpls-mna-fwk and it is
also benefiical to have read draft-ietf-mpls-mna-requirements.

My review didn't uncover any defects in the encodings and backward
compatibility. However, while I follow the MPLS WG, I didn't have
the time bandwidth to participate in the design team. Nevertheless, I feel
this is important work and support its advancement.

Given the multiple levels methods of encoding, the implications, and
backward compatibility considerations, I feel that implementations should
be required prior to publication.

Major Issues: None

Minor Issues:
   Possibly consider removing the examples in section 5.6 and referring to
   the more detailed examples in section 14.

Nits:

   I've attached some editorial suggestions including the hyphenation of
   multi-word adjectives to improve readability.

Thanks,
Acee