Reviewer: Charlie Kaufman
Review result: Ready

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 document primarily concerns the syntax for extensions to the IS-IS and OSPF protocols to carry information about alternative metrics and constraints on path selection. As described in Security Considerations, there are attacks possible if this new information is corrupted or miscommunicated, but those attacks are addressed in other existing RFCs.

	--Charlie