RtBrick Inc. Juniper Networks, Inc. Juniper Networks, Inc. Juniper Networks, Inc. Juniper Networks, Inc. eBay The MPLS source routing paradigm provides path control for both intra- and inter- Autonomous System (AS) traffic. RSVP-TE is utilized for intra-AS path control. This documents outlines how MPLS routers may use the BGP labeled unicast protocol (BGP-LU) for doing traffic-engineering on inter-AS links.