OSI model by layer |
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Intermediate System to Intermediate System (IS-IS, also written ISIS) is a routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It accomplishes this by determining the best route for data through a packet switching network.
The IS-IS protocol is defined in ISO/IEC 10589:2002[2][3] as an international standard within the Open Systems Interconnection (OSI) reference design. The Internet Engineering Task Force (IETF) republished IS-IS in RFC 1142, but that RFC was later retracted and marked as historic[4] because it republished a draft rather than a final version of the (International Organization for Standardization) ISO standard, causing confusion.
In 2005, IS-IS was called "the de facto standard for large service provider network backbones".[5]
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