An interior protocol for routing within an Autonomous System (AS), i.e., a group of routers within a given administrative domain. IGP was described in IETF RFC 1074 (1988). Common IGPs include the Routing Information Protocol (RIP) and the Open Shortest Path First (OSPF) protocol. See also AS, domain, exterior protocol, IETF, interior protocol, OSPF, protocol, RIP, router, and routing.
(2) (Integrated Graphics Processor) The inclusion of a graphics processing unit (GPU) on the motherboard. In a PC, it typically refers to the chipset, such as the Northbridge. An IGP refers to enhanced video capabilities that accelerate 3D rendering in contrast to an "integrated graphics controller" (IGC) that is more basic. See integrated graphics.