I have reviewed this document 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. I think the document is written very clear. The management & operation aspect of changing to topology-transparent zone from existing OSPF topology is described very clearly. Linda Dunbar Huawei USA IP Technology Lab 5340 Legacy Drive, Plano, TX 75024 Tel: +1 469-277 - 5840 Fax: +1 469 -277 - 5900