I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. Document editors and WG chairs should treat these comments just like any other last call comments. This document primarily specifies the IS-IS code points and TLV/sub-TLV data structures for IS-IS support of traffic engineering and generalized multi-protocol label switching. The Security Considerations section is probably correct when it says that it raises no new security considerations. However, I would like to see a Reference to RFC 5304 added as pertaining to general IS-IS Security Considerations. Thanks, Donald =============================  Donald E. Eastlake 3rd   +1-508-333-2270 (cell)  155 Beaver Street  Milford, MA 01757 USA  d3e3e3 at gmail.com