Acronyms
| ABR | area border router |
| AFI | address family identifier |
| AS | autonomous system |
| ASN | autonomous system number |
| ASBR | autonomous system border router |
| BCD | Binary Coded Decimal |
| BDR | Backup Designated Router |
| BFD | Bidirectional Forwarding Detection |
| BGP | Border Gateway Protocol |
| BoS | Bottom of Stack |
| CBGP | confederated Border Gateway Protocol |
| CE | Customer Edge (router) |
| CLNP | Connectionless Network Protocol |
| CsC | Carrier Supporting Carrier |
| DCU | Destination Class Usage |
| DIS | designated intermediate system |
| DR | Designated Router |
| DUAL | Diffuse Update Algorithm |
| EBGP | exterior Border Gateway Protocol |
| ECMP | equal-cost multipafh |
| EGP | Exterior Gateway Protocol |
| EIGRP | Enhanced Interior Gateway Routing Protocol |
| EL-BGP | external Labeled BGP, see L-EBGP |
| FA-LSP | Forwarding Adjacency LSP |
| EEC | Forwarding Equivalence Class |
| FIB | Forwarding Information Base (forwarding table) |
| GMPLS | Generalized Multiprotocol Label Switching |
| GRE | Generic Routing Encapsulation |
| IANA | Internet Assigned Numbers Authority |
| IBGP | interior Border Gateway Protocol |
| IETF | Internet Engineering Task Force |
| IGP | Interior Gateway Protocol |
| IGRP | Interior Gateway Routing Protocol |
| IL-BGP | internal Labeled BGP, see L-IBGP |
| IS-IS | Intermediate System to Intermediate System routing protocol |
| ISO | International Standards Organization |
| L2 VPN | Layer 2 Virtual Private Network |
| L3VPN | Layer 3 Virtual Private Network |
| L-BGP | Labeled BGP |
| L-EBGP | Labeled exterior Border Gateway Protocol |
| L-IBGP | Labeled interior ... |
