Last Call Review of draft-ietf-teas-5g-ns-ip-mpls-15
review-ietf-teas-5g-ns-ip-mpls-15-secdir-lc-salowey-2025-01-29-00

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG. These comments were written primarily for the benefit of the
security area directors. Document editors and WG chairs should treat
these comments just like any other last call comments.

The summary of the review is ready, but could possibly be improved.

The document does have security considerations that highlight some of the areas
in the architecture where security controls can be applied.  It leaves most of
the details of the these controls to other documents, which seems appropriate.
As someone not intimately familiar with slices I found it little hard to
determine if other should be considered in other sections of the document to
help enforce the desired isolation.  It would be helpful to understand what
security guarantees the isolation is expected to provide and what deployment
parameters and choices affect those guarantees. It could be that the list in
the security considerations section is complete, but it seemed a bit short. 
For example it mentions NSC authentication in security considerations as out of
scope, an this is the only mention of the NSC authentication. As a somewhat
naive reader I'm not sure where this control would be applied and how it
affects the architecture, this may be discussed in other documents but after a
brief investigation this wasn't clear. The authors should consider if the
document should list additional places where security controls can be applied
to reach isolation goals.