System to intermediate system Intermediate., the IS-is or iPhone SMS-iPhone SMS (IS-IS) mode, short phrase, Intermediate Sysytem-Intermediate System is a method designed to transfer useful data in a computer network, a group of computers connected together for physical and or similar devices.

This protocol by determining the best path for data transmission in a network of the type of switching pack, do it.The protocol in ISO/IEC 10589:2002 as an international standard on the reference model the OSI, or The Associated open systems was defined. Although it is originally an ISO standard. with this organization, the IETF defined the protocol as a standard internet released. IS-IS or system interfaces-system interfaces, as a de facto standard for backbone service providers Great be considered.