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.

The summary of the review is Ready

The document adds a specific TLV for peer-up messages instead of sharing TLVs with initiation messages.  This seems straightforward and the reference to RFC 7854 security considerations seems appropriate.