Interior Gateway Protocol


Interior Gateway Protocol (IGP) is a type of networking protocol used to exchange routing information within a single, autonomous network system or domain. It is designed for routing within an organization’s internal networks, allowing information between connected sub-networks to be shared efficiently. Examples of IGP protocols include Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Interior Gateway Routing Protocol (IGRP).


The phonetics of “Interior Gateway Protocol” is: In-tee-ree-or Gayt-way Proh-tuh-kawl

Key Takeaways

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  1. Interior Gateway Protocol (IGP) is a type of routing protocol that is used by routers to exchange routing data within an autonomous system(AS).
  2. Two types of IGPs, Link-state protocols and Distance-vector protocols, operate in a network by specifying different methods to decide on preferred paths. These protocols include Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Interior Gateway Routing Protocol (IGRP).
  3. IGP is essential for the efficient operation of a network since it simplifies routing decisions and reduces CPU usage in routers. However, in large network architectures, IGPs alone may not be sufficient and may require additional routing protocols to operate effectively.

“`These main points provide an overview of what Interior Gateway Protocol is, its types, and its importance in network operations.


The technology term Interior Gateway Protocol (IGP) is important because it serves a crucial role in how routers communicate with each other within a network. IGP facilitates the sharing of information about the topology of the autonomous system that a specific router belongs to. This allows for the configuration of dynamic routing, providing an adaptable, automatic solution to manage pathfinding for packets within a network. With the IGP, networks can automatically adjust and select the most efficient route for data packet transfers, especially during periods of high congestion or when a failure occurs. IGPs such as Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Interior Gateway Routing Protocol (IGRP) therefore contribute to optimizing network performance and reliability.


Interior Gateway Protocol (IGP) is an essential technology term associated with network communication. Its main function is to transfer information packets within a single autonomous system on a network. An autonomous system is essentially a network or group of networks under a common administration. Thus, IGP is responsible for ensuring data gets transferred efficiently within this domain, allowing for smooth communication and operation across various platforms on the network.An Interior Gateway Protocol operates under a specific routing protocol, simplifying the process of routing information. Examples of IGPs are Routing Information Protocol (RIP) and Open Shortest Path First (OSPF), which have unique ways of conducting data transmission. RIP works in a way that the shortest route to transmit information from one device to the other is based on distance, evaluated as the number of routers a dataset must pass through. On the other hand, OSPF measures the shortest path based upon a customizable value set by the network admin. The ultimate function of the Interior Gateway Protocol is to enhance network communication by making data routing more organized and efficient.


Interior Gateway Protocols (IGPs) are networking protocols used by routers to exchange routing information within an Autonomous System (AS). These protocols are primarily used for internal routing. Here are three real-world examples:1. **Open Shortest Path First (OSPF)**: OSPF is widely used in large enterprise networks. It allows routers to dynamically learn routes from other routers and advertise routes to their peers by creating a map of the network. OSPF can determine the best (or “shortest”) path for data to travel. An example could be the internal network of a large organization where different branches and offices need to connect to the central data centers, requiring efficient routing of data packets. 2. **Routing Information Protocol (RIP)**: RIP is an older IGP often used in smaller networks due to its simplicity and ease of configuration. It’s best suited for smaller networks without many routers as it can’t handle complex or large networks effectively. An example of this may be a small business’s local area network where RIP is used for sharing routing information amongst the few routers present.3. **Intermediate System to Intermediate System (IS-IS)**: This protocol is widely used by telecommunication providers in their core networks. IS-IS works well in large networks because it scales effectively. An example could be a telecommunication company’s mobile network, which needs efficient routing to handle the high volume of data traffic.

Frequently Asked Questions(FAQ)

Q: What is an Interior Gateway Protocol (IGP)?A: An Interior Gateway Protocol (IGP) is a type of protocol used for exchanging routing information within a single autonomous system (AS) such as an enterprise’s local network.Q: What is the main function of an IGP?A: IGPs determine network path selection for a single network structure. They are responsible for routing packets and data within a local area or internal network.Q: What are some examples of Interior Gateway Protocols?A: Common examples of IGPs include Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Intermediate System to Intermediate System (IS-IS).Q: What is the key difference between IGPs and Exterior Gateway Protocols (EGPs)?A: The main difference lies in their areas of operation. IGPs operate within a single network or autonomous system, while EGPs route information between separate autonomous systems.Q: Are IGPs appropriate for all sizes and types of networks?A: Not necessarily. Some IGPs, like RIP, work well for small networks, but for larger networks with more routers and complex structures, a more scalable IGP like OSPF may be more suitable.Q: Is it possible for a network to use more than one IGP?A: Yes, in complex network environments, it may be necessary to use multiple IGPs. This is typically managed by a function known as redistribution.Q: How do IGPs typically choose the best path for data transfer?A: IGPs typically choose the best path based on the smallest number of hops, the shortest path, or the least cost, depending on the specific protocol used.Q: Does IGP affect internet speeds?A: Yes. A well-configured IGP can provide more efficient path selection, reducing data latency and potentially increasing internet speeds within the local network.

Related Tech Terms

  • Routing Information Protocol (RIP)
  • Open Shortest Path First (OSPF)
  • Enhanced Interior Gateway Routing Protocol (EIGRP)
  • Intermediate System to Intermediate System (IS-IS)
  • Routing Protocol Metrics

Sources for More Information

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