I reviewed the document "OSPFv3 LSA Extendibility" (draft-ietf-ospf-ospfv3-lsa-extend-20.txt) as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the operational area directors. Document editors and WG chairs should treat these comments just like any other last call comments. Intended status: Standards Track Current IESG state: In Last Call (ends 2018-01-11) IANA State: IANA - Review Needed Updates RFC 5340 (OSPF for IPv6) and RFC 5838 (Support of Address Families in OSPFv3) Summary: The document extends the Link State Advertisement (LSA) format by encoding the existing OSPFv3 LSA information in Type-Length-Value (TLV) tuples and allowing advertisement of additional information with additional TLVs. The document provides backward compatibility mechanisms. There are no relevant nits in the document. I believe the document does not cause any issues related to operations and management. It has a clear language and looks ready for publication. Mehmet