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 describes the BGP encodings and procedures for exchanging the information elements required by Multicast in MPLS/BGP IP VPNs, as specified in draft-ietf-l3vpn-2547bis-mcast. I would like to draw the Security AD's attention to consider whether the security considerations section of this draft contains adequate information. The security considerations section of this draft list a number of security requirements, but very few considerations. That is, the section list requirements but says very little, if anything at all, about the security threats that are addressed by these requirements or whether handling of these security threats falls inside or outside the scope of this document. It is hard to review these security requirements in absence of a discussion of the threats they are supposed to address. /Stefan