What Is IGP?

Are you curious to know what is IGP? You have come to the right place as I am going to tell you everything about IGP in a very simple explanation. Without further discussion let’s begin to know what is IGP?

In the realm of computer networking, efficient and reliable communication is paramount. To facilitate the routing of data packets within a network, various routing protocols are employed. One key category of these protocols is Interior Gateway Protocols (IGPs). In this blog, we will delve into the concept of IGP, its significance in network communication, and the popular IGPs used in the world of networking.

What Is IGP?

Iterior Gatewnay Protocol, abbreviated as IGP, is a type of routing protocol used within an autonomous system (AS). An autonomous system is a network or collection of networks under a single administrative control. IGPs are designed to manage and control routing within this autonomous system, ensuring that data packets are efficiently directed to their intended destinations.

Key Characteristics Of IGPs:

  1. Single Autonomous System: IGPs operate within a single autonomous system. They are responsible for managing the routing of data within this specific network.
  2. Interior Routing: IGPs are used for interior routing, which means they handle the routing of data within the boundaries of the autonomous system and not between different autonomous systems.
  3. Dynamic Routing: IGPs are dynamic routing protocols, which means they adjust and update routing tables based on changes in the network, such as link failures or the addition of new devices.
  4. Distance Vector or Link-State: IGPs can be further categorized into two main types: Distance Vector and Link-State protocols. Each type has its own way of calculating and updating routing information.

Significance Of IGPs In Networking

IGPs play a critical role in ensuring efficient and reliable data transmission within an autonomous system. Here’s why IGPs are significant in networking:

  1. Routing Table Management: IGPs maintain routing tables that contain information about the network topology within the autonomous system. These tables are used to determine the best path for data packets to reach their destinations.
  2. Automatic Updates: IGPs automatically update routing tables in response to changes in the network, such as device failures or changes in network topology. This adaptability ensures that data continues to flow even in the face of network changes.
  3. Efficient Routing: IGPs aim to find the most efficient path for data packets to travel within the autonomous system, optimizing network performance and reducing latency.

Common Interior Gateway Protocols

Several IGPs are commonly used in networking. Here are a few notable ones:

  1. Routing Information Protocol (RIP): RIP is a distance-vector IGP that uses hop count as a metric to determine the best route. It’s simple but has limitations in handling larger networks.
  2. Open Shortest Path First (OSPF): OSPF is a popular link-state IGP that calculates routes based on the cost of links. It’s highly scalable and efficient for larger networks.
  3. Intermediate System to Intermediate System (IS-IS): IS-IS is another link-state IGP used mainly in large service provider networks. It’s known for its fast convergence and scalability.
  4. Enhanced Interior Gateway Routing Protocol (EIGRP): EIGRP is a Cisco proprietary hybrid routing protocol that combines features of both distance-vector and link-state protocols. It offers fast convergence and is suitable for Cisco-based networks.


Interior Gateway Protocols (IGPs) are a vital component of computer networking, responsible for efficient routing within autonomous systems. They dynamically manage routing tables, adapt to network changes, and optimize data transmission within the boundaries of an autonomous system. Understanding IGPs is essential for network administrators and engineers, as it enables them to design, configure, and maintain robust and responsive networks that meet the demands of modern communication.

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What Are The Three Types Of IGP?

Specific examples of IGPs include Open Shortest Path First (OSPF), Routing Information Protocol (RIP), Intermediate System to Intermediate System (IS-IS) and Enhanced Interior Gateway Routing Protocol (EIGRP).

What Are The Two Types Of IGP?

Interior gateway protocols can be divided into two categories: distance-vector routing protocols and link-state routing protocols. Specific examples of IGP protocols include Open Shortest Path First (OSPF), Routing Information Protocol (RIP) and Intermediate System to Intermediate System (IS-IS).

What Is The Difference Between IGP And Ospf?

IGPs, as opposed to exterior gateway protocols (EGPs), distribute routing information within one autonomous system, such as your LAN. OSPF works on the basis of dividing your network into areas. An area consists of network nodes and routers that can logically be grouped together.

Which Protocols Are IGP?

Routing: IGP and EGP Protocols | Baeldung on Computer Science

The most popular IGP protocols are Open Shortest Path First (OSPF), Intermediate System to Intermediate System (IS-IS), Routing Information Protocol (RIP), and Enhanced Interior Gateway Routing Protocol (EIGRP).

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