MPLS Terminology

This section provides an overview of the common MPLS-related terminology used for the rest of this book:

  • Forwarding Equivalence Class (FEC)— As noted in RFC 3031(MPLS architecture), this group of packets are forwarded in the same manner (over the same path with the same forwarding treatment).

  • MPLS Label Switch Router (LSR)— Performs the function of label switching; the LSR receives a labeled packet and swaps the label with an outgoing label and forwards the new labeled packet from the appropriate interface. The LSR, depending on its location in the MPLS domain, can either perform label disposition (removal, also called pop), label imposition (addition, also called push) or label swapping (replacing the top label in a label stack ...

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