Appendix B: Glossary

A-E

AAL5oMPLS

ATM protocol layer AAL5 to MPLS

ATM

Asynchronous Transfer Mode

AtoM

Any Transport over MPLS

Back-up Path

The path that traffic takes if there is a failure on the primary path

BGP

Border Gateway Protocol

Binding

The process of relating an FEC to a label.

BW

Bandwidth

CBR

Constant Bit Rate

CIR

Committed Information Rate

CR-LDP

Constraint-based Routing over Label-Distribution Protocol.

CRoMPLS

Constraint-based Routing over MPLS

DiffServ

Differentiated Services; a Layer-3 marking and classifying protocol.

DOD

Downstream On Demand

DOU

Downstream Unsolicited

Dropped Packets

Percentage of packets lost as they move from end to end.

DWDM

Dense Wavelength Division Multiplexing

EIGRP

Enhanced Interior Gateway Routing Protocol

EoMPLS

Ethernet over MPLS

Explicit Route

A path across the Internet wherein all routers are specified. Packets must follow this route and cannot detour.

Explicit Routing

Clearly detailed or expressed routing, such as strict source routing and MPLS.

F-L

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.