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 defines several subcodes for BGP Finite State Machine Error that could provide more information to help network operators in diagnosing BGP FSM issues and correlating network events. The Security Considerations section is short and to the point: "This document does not change the security properties of BGP." This is true, and I see no other security considerations needed... W