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Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
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Chapter 16 Configuring MPLS Layer 2 VPNs
Glossary
Glossary
ATM—Asynchronous Transfer Mode. A method of data transportation, whereby fixed-length packets
are sent over a switched network. The method’s ability to ensure reliable delivery of packets at a high
rate makes it suitable for carrying voice, video, and data.
AToM—Any Transport over MPLS. AToM is a solution for transporting Layer 2 packets over an MPLS
backbone. AToM enables service providers to supply connectivity between customer sites with existing
data link layer (Layer 2) networks by using a single, integrated, packet-based network infrastructure—a
Cisco MPLS network. Instead of separate networks with separate network management environments,
service providers can deliver Layer 2 connections over an MPLS backbone.
Dot1q—IEEE 802.1Q is the networking standard that supports virtual LANs (VLANs) on an Ethernet
network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying
procedures to be used by bridges and switches in handling such frames.
EoMPLS—Ethernet over MPLS. This technology leverages an existing MPLS backbone network to
deliver Transparent LAN Services based on Ethernet connectivity to the customer site.
GEC—Gigabit EtherChannel. A high-performance Ethernet technology that provides gigabit per second
transmission rates. It provides a flexible and scalable bandwidth with resiliency and load sharing across
links for switches, router interfaces, and servers. Supports up to eight links per channel.
HDLC—High-Level Data Link Control (HDLC) is a bit-oriented code-transparent synchronous data
link-layer protocol developed by the International Organization for Standardization (ISO).
MPLS—Multiprotocol Label Switching. A mechanism in high-performance telecommunications
networks that directs and carries data from one network node to the next. MPLS makes it easy to create
virtual links between distant nodes. It can encapsulate packets of various network protocols.
QinQ—IEEE 802.1ad is an Ethernet networking standard informally known as IEEE 802.1QinQ, and is
an amendment to the IEEE standard 802.1Q-1998. The technique is also known as provider bridging,
Stacked VLANs, or simply QinQ or Q-in-Q.
VPLS—Virtual Private LAN Service. A method to provide Ethernet-based multipoint-to-multipoint
communication over IP and MPLS networks.