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. This draft is well written. I only have two comments. 1. It is lack of manageability aspects to produce MIB; 2. Should be added flow examples for RPL; B. R. Tina http://tinatsou.weebly.com/index.html