Last Call Review of draft-ietf-rmcat-sbd-10
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Reviewer: Dan Romascanu
Review Date: 2018-03-01
IETF LC End Date: 2018-03-16
IESG Telechat date: 2018-04-05
This is an interesting and well-written document. The method described in the document have a proposed status of Experimental that seems appropriate, and I liked the fact that the expected feedback from the experiments is mentioned in Section 6. I believe that the document is almost ready for publication from the Gen-ART perspective, but lacks reference and relation to existing work in the IETF related to the definitions and measurement methods for metrics like packet loss or one-way delay. Adding this information would make clear what is currently missing and why this work is needed.
1. The document does not refer or relate to existing work in the IETF. Metrics like packet loss or one-way-delay have been defined in IETF WGs like IPPM and dealt with in real-time applications context by XRBLOCK. For example Packet Loss is defined by RFC 2680, OWD by RFC 7679. Are these applicable? What is missing and why new work is necessary? I assume that there are good answers to these questions, but these are not included in the document.
1. It would be useful to explain what the authors mean in this document by 'signal' as the usage of the term is different than in other context. For example in section 1.2, or more specifically in section 1.2.1 where a sentence like 'Packet loss is often a relatively rare signal.' is hard to understand without such context explanation.
1. Several acronyms are not expanded at first occurrence - for example, but not limited to: RTP, ECN, etc.