Packet routing in the Internet is divided into two general groups: interior and exteriorrouting. Interior routing happens inside or interior to an independent network system. In TCP/IP terminology, these independent network systems are called autonomous systems. Within an autonomous system (AS), routing information is exchanged using an interior routing protocol chosen by the autonomous system's administration. The exterior routing protocols, on the other hand are used between the autonomous systems.
Interior routing protocols determine the "best" route to each destination, and they distribute routing information among the systems on a network. There are several interior protocols:
- The Routing Information Protocol (RIP) is the interior protocol most commonly used on UNIX systems. RIP is included as part of the UNIX software delivered with most systems. RIP uses distance vector algorithm that selects the route with the lowest "hop count" (metric) as the best route. The RIP hop count represents the number of gateways through which data must pass to reach its destination. RIP assumes that the best route is the one that uses the fewest gateways.
- Hello is a protocol that uses delay as the deciding factor when choosing the best route. Delay is the length of time it takes a datagram to make the round trip between its source and destination. It was the interior protocol of the original 56 kbps NSFNET backbone and has had very little use otherwise.
- Intermediate System to Intermediate System (IS-IS) is an interior routing protocol from the OSI protocol suite. It is a link-state protocol. It was the interior routing protocol used on the T1 NSFNET backbone.
Open Shortest Path First (OSPF) is another link-state protocol developed for TCP/IP. It is suitable for very large networks and provides several advantages over RIP.
Interior Routing and Protocols
Related Terms: Exterior Routing, RIP, IS-IS, OSPF, LinkState Routing, Vector Distance Routing
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