http://www.rfc-editor.org/rfc/rfc6882.txt
RFC 6882: Support for Resource Reservation Protocol Traffic Engineering (RSVP-TE) in Layer 3 Virtual Private Networks (L3VPNs), K. Kumaki, T. Murai, D. Cheng, S. Matsushima, P. Jiang2013-03-01T23:00:00-00:00The VPNs may support a number of customer services, including RSVP and Resource Reservation Protocol Traffic Engineering (RSVP-TE) traffic. This document describes how to support RSVP-TE between customer sites when a single PE supports multiple VPNs and labels are not used to identify VPNs between PEs.