http://www.rfc-editor.org/rfc/rfc5520.txt
RFC 5520: Preserving Topology Confidentiality in Inter-Domain Path Computation Using a Path-Key-Based Mechanism, R. Bradford, JP. Vasseur, A. Farrel2009-04-01T23:00:00-00:00This document defines a mechanism to hide the contents of a segment of a path, called the Confidential Path Segment (CPS). The CPS may be replaced by a path-key that can be conveyed in the PCE Communication Protocol (PCEP) and signaled within in a Resource Reservation Protocol TE (RSVP-TE) explicit route object. [STANDARDS-TRACK]