F-L

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Fast ReRoute (FRR)

A protection plan in which a failure can be detected without a need for error notification or failure signaling. (Cisco)

FEC

Forward Equivalence Class; also, Functional Equivalent Class

FWQ

Fair-Weight Queuing

GMPLS

Generalized Multi-Protocol Label Switching

GRE

Generic Routing Encapsulation (RFC 1701)

Hard State

A link, path, or call that will stay alive until it is specifically shut down.

Implicit Routing

Routing that is not detailed but is implied, such as traditional IP routing.

Independent Control

A label-distribution method in which there is no designated label manager, and routers generate and distribute their own cross-connect tables.

IntServ

Integrated Service; allows traffic to be classified into three groups: guaranteed, controlled load, and best effort. IntServ works together with the RSVP protocol.

IP

Internet Protocol

IS-IS

Intermediate System to Intermediate System

IS-IS-TE

Intermediate System to Intermediate System with Traffic Engineering

ISP

Internet Service Provider

Jitter

Unpredictable variable in delay caused by congestion.

L2TP

Layer-2 Tunneling Protocol

L2TPv3

Layer-2 Tunneling Protocol, version 3

L2VPN

Layer-2 Virtual Private Network; L2VPN may support DLCI maps for Frame Relay or VPI mapping for ATM. It may also support Ethernet switching MAC tables.

L3VPN

Layer-3 Virtual Private Network is a VPN that uses routing tables.

Latency

Time that it takes a signal to move through a device.

LDP

Label Distribution Protocol

LER

Label Edge Router

LIB

Label Information Base

Link Protection

A backup method that replaces the entire link or path of a failure.

LMP

Link Management Protocol

LSP

Label Switch Path

LSR

Label Switch Router

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