I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please treat these comments just like any other last call comments. For more information, please see the FAQ at . Document: draft-ietf-bess-ir-04 Reviewer: Paul Kyzivat Review Date: 2016-08-09 IETF LC End Date: 2016-08-10 IESG Telechat date: 2016-08-18 Summary: Unfortunately, I don't have the expertise to review this draft. (Of the review summaries available to me, the one I want to use is "This draft has serious issues, described in the review, and needs to be rethought." But I don't think I am in a position to make such a judgement given my lack of knowledge of the subject domain.) Issues: Major: 0 Minor: 2 Nits: 0 (1) MINOR: Section 5 begins: As previously specified, when the "Tunnel Type" field of a PTA is set to "IR", the "Tunnel Identifier" field of that PTA does not contain the IR P-tunnel identifier. This section specifies the procedures for setting the "Tunnel Identifier" field of the PTA when the "Tunnel Type" field of the PTA is set to "IR". I have trouble parsing this so it makes sense. The problem is with "As previously specified". Normally when I see something like this I expect it to mean "previously within this document". I think in this case it means in RFCs 6513 and/or 6514. I think this ought to be clearer. E.g., As specified in [RFC6513], ... (2) MINOR (?!?): Lacking any knowledge of the subject matter of this draft, I found it impossible to review in a meaningful way. But I tried! I came to the tentative conclusion that this document is struggling to document an extremely complex system. In such a situation publishing the sort of documentation provided here is probably better than not doing so. But I fear it isn't sufficient - that it will be unlikely that a new implementer, schooled in the subject matter, will be able to create a correct implementation. The problem is with the system/algorithms, not with the document. (NOTE: I've made this minor rather than major because I don't consider myself competent to say this is a real problem or if it is one that this draft should be expected to fix.)