Hi,

I have been selected as the Operational Directorate (opsdir) reviewer for this Internet-Draft. 

The Operational Directorate reviews all operational and management-related Internet-Drafts to ensure alignment with operational best practices and that adequate operational considerations are covered.

A complete set of _"Guidelines for Considering Operations and Management in IETF Specifications"_ can be found at https://datatracker.ietf.org/doc/draft-ietf-opsawg-rfc5706bis/.

While these comments are primarily for the Operations and Management Area Directors (Ops ADs), the authors should consider them alongside other feedback received.


- Document: [draft-ietf-intarea-multicast-application-port-04]

- Reviewer: [Jen Linkova]

- Review Date: [March 19 2026]

- Intended Status: [Standards Track] 

 
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## Summary 

- Ready: No issues found. This document is ready for publication. 

## General Operational Comments Alignment with RFC 5706bis 

I believe the document would benefit from an Operational Consideration section discussing the migration path. Maybe just a few sentences saying that if a unicast application is using this port currently, clients might gradually stop ability to connect to it, as those client hosts become compliant with this document?

## Major Issues 

 > No major issues found. 

 

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## Minor Issues 


The document currently says:

"The Multicast Application Port SHALL NOT be used as a destination port for any non-multicast messages. It MAY be used as a source port by an application that exclusively uses multicast messages. If any application messages are unicast, then a different port should be used for the source port."

- Is 'should' in the last sentence intentionally lower-case? 

Is it allowed (MAY/SHOULD NOT or even MUST NOT) to send a unicast message from src port == mcast-app-port?
Or is it intentional that the case of a unicast message with src port == mcast-app-por is unspecified?
(it would also explains why Section 3 says that "Hosts SHALL discard all incoming, non-multicast packets that use this destination port" but doesn't say anything about packets with that source port).