Juniper Networks Field Guide and Reference

In MPLS, 20-bit unsigned integer in the range 0 through 1,048,575 used to identify a packet traveling along an LSP.

Sequence of routers that cooperatively perform MPLS operations for a packet stream. The first router in an LSP is called the ingress router, and the last router in the path is called the egress router. An LSP is a point-to-point, half-duplex connection from the ingress router to the egress router. (The ingress and egress routers cannot be the same router.)

Communication path between two neighbors. A link is up when communication is possible between the two end points.

Packets that contain information about the state of adjacencies to neighboring systems.

Optional BGP path attribute carried in internal BGP update packets that indicates the degree of preference for an external route.

In the context of traffic engineering, a path that can use any route or any number of other intermediate (transit) points to reach the next address in the path.

Label-switching router. A router on which MPLS and RSVP are enabled and is thus capable of processing label-switched packets.