Acronym Glossary - BGP Design and Implementation - page 611

IGP Interior Gateway Protocol. A type of routing protocol for exchanging
routing information within a domain.

Interior Gateway Routing Protocol. An IGP developed by Cisco. IGRP

implicit null. One of the reserved labels used in LDP and TDP. Imp-Null

input/output. A BGP process.

I/O

Internet Protocol. An IETF network layer protocol. IP

IPC Inter-Process Communication. A mechanism to exchange messages among
different processes in a system.

IP version 4. The current version of IP used in most networks. IPv4

IS-IS Intermediate System-to-Intermediate System. An IETF and ISO protocol
to disseminate interior routing information.

ISP Internet service provider. A service provider that delivers Internet
connectivity.

LDP Label Distribution Protocol. An IETF protocol to distribute label binding
information between LSRs.

Label Edge Router. A router that performs label imposition or disposition. LER

LFIB Label Forwarding Information Base. A database for labeled packet
processing.

LIB Label Information Base. A database used by an LSR to store labels learned
from other LSRs, as well as labels assigned by the local LSR.

LSP Label Switched Path. A sequence of hops in which a labeled packet travels
by means of label-switching mechanisms.

LSR Label Switch Router. A router that forwards a packet based on the value of
a label encapsulated in the packet.

MAC Media Access Control. An IEEE protocol that deals with Layer 2 control
and encapsulation.

Message Digest 5. A one-way hashing algorithm that produces a 128-bit MD5

hash.