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MPLS-Enabled Applications: Emerging Developments and New Technologies, Third Edition by Ina Minei, Julian Lucek

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Chapter D: Acronyms

2G Second-generation mobile network
3G Third-generation mobile network
6PE A scheme to allow IPv6 traffic to be carried over an IPv4 MPLS network
AAL ATM Adaptation Layer
ABR Area Border Router. A router used to connect two OSPF areas
AC Attachment Circuit. In the context of Layer 2 VPNs, the physical or logical circuit used to connect a CE to a PE
ACH Associated Channel. In the context of VCCV, the ACH is the header that is added to the packet to trigger its processing by the control plane
AF Assured Forwarding DiffServ class
AFI Address Family Identifier. In BGP, the identity of the network layer protocol associated with the network layer reachability information being advertised
AIS Alarm Indication Signal. In SONET/SDH networks and ATM networks, a means of signaling in the downstream direction the existence of a fault
AN Access Node. Used especially in the context of Seamless MPLS, an AN is a generic term for a customer-facing device at the outer edge of the network, for example a DSLAM
APS Automatic Protection Switching. A method for providing protection at the SONET/SDH layer by moving the traffic to a standby link
ARP Address Resolution Protocol
AS Autonomous System. A collection of routers belonging to the same administrative entity and having a common external routing policy
ASBR Autonomous System Border Router. A router used to connect two ASs
ATM Asynchronous Transfer Mode
ATM PVC ATM Permanent Virtual Channel

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