This document reviews multiple use cases for a new extension to MPLS, Network Action Indicators.

The entirety of the Security Considerations section reads:

This document introduces no new security considerations.

I am not convinced, and I think an explanation is needed on why MNA are more or less susceptible to attacks than the way these use cases are signaled today. That *could* lead to discussion of new security controls.

Specifically I would recommend to address the more difficult migration and coexistence scenarios listed in Sections 3 and 4.

In fact, even a reference to https://www.ietf.org/archive/id/draft-ietf-mpls-mna-fwk-10.html#name-security-considerations may do the job, assuming the authors believe the Security Considerations over in that document cover the use cases listed here.