Title: secdir review of draft-ietf-trill-rbridge-protocol-14 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. I have limited my review to security related issues and whether the document have a reasonable security considerations section. I have not reviewed the technical content of the document. The document seems sound form a security perspective. The security considerations section is clear on the fact layer 2 bridging is not inherently secure but appears to make a reasonable job at describing guidance on how to address various security issues related to this protocol. I find no major issues that the security ADs should be aware of. /Stefan