A specification (July 1997) from the ATM Forum (now merged into the MFA Forum) designed to enhance LAN Emulation (LANE) by enabling interELAN communications without the intervention of a router, and the associated packet delay. MPOA provides high-performance, scalable routing functionality over an ATM platform, expanding on LANE, Classical IP over ATM (RFC 1577), and the IETF's Next Hop Resolution Protocol (NHRP) in order to create a standardized notion of a virtual router within an ATM network. See also ATM, ATM Forum, Classical IP over ATM, ELAN, IETF, LANE, MFA Forum, NHRP, packet, router, and virtual.
(MultiProtocol Over ATM) An ATM Forum standard that provides routing of legacy protocols (IP, IPX, etc.) over ATM networks. MPOA separates the routing processing from the actual forwarding. A route server performs the routing calculations and sends its results to the ATM switches and edge devices which perform high-speed forwarding of the packets. Before MPOA, LAN emulation (LANE) required a router to communicate between subnets. See virtual routing, I-PNNI and LANE.