{"id":37743,"date":"2025-06-05T14:13:49","date_gmt":"2025-06-05T14:13:49","guid":{"rendered":"https:\/\/www.resellerclub.com\/blog\/?p=37743"},"modified":"2026-02-04T13:09:37","modified_gmt":"2026-02-04T13:09:37","slug":"interior-gateway-protocol-igrp","status":"publish","type":"post","link":"https:\/\/www.resellerclub.com\/blog\/interior-gateway-protocol-igrp\/","title":{"rendered":"Types of Interior Gateway Protocol (IGRP)"},"content":{"rendered":"

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Summary<\/strong><\/p>\n

Routing protocols help routers decide the best path for data to travel across a network. These protocols guide how information moves from one device to another. Routing protocols are mainly divided into two categories: Interior Gateway Protocols (IGP) and Exterior Gateway Protocols (EGP). IGPs work within a single network, such as an office or campus network, while EGPs connect different networks. IGRP is one type of Interior Gateway Protocol that is used to manage routing inside one network.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

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Routers communicate data on the optimal network routes via a routing protocol. They direct the movement of data from one location to another. Routing protocols are split into two main groups: interior gateway protocol (IGP) and exterior gateway protocol (EGP). <\/p>\n

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IGP works inside a single network, like a company or campus, while EGP connects different networks. IGRP is a type of interior gateway protocol designed to manage routes within one system.<\/p>\n

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Main Types of <\/strong>IGP: Interior Gateway Protocol<\/strong> (IGRP)<\/strong><\/h2>\n

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There are different gateway routing protocols under the IGP category, and IGRP is one of them. Here are the main types, including IGRP, explained:<\/p>\n

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IGRP (Interior Gateway Routing Protocol)<\/strong><\/h3>\n

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The IGRP routing protocol was created by Cisco. Within a network, it lets servers communicate about the best routes. To find the best way, it looks at things like delay and capacity. Updating happens every 90 seconds, and it can handle up to 255 hops, or router steps. Larger networks can use it, but subnet sizes can not be changed.<\/p>\n

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RIP (Routing Information Protocol)<\/strong><\/h3>\n

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RIP is a simple IGP protocol. It looks for routes by counting hops, but it stops after 15 hops, which is good for small networks. Once every 30 seconds, which might make things take longer if your network is busy.<\/p>\n

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OSPF (Open Shortest Path First)<\/strong><\/h3>\n

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OSPF is another IGP type. It maps the network and picks the shortest path using more than just hops. It is faster than IGRP and works well in big networks.<\/p>\n

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Each type has its strengths, but IGRP stands out for its use in Cisco systems and larger setups.<\/p>\n

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How to Choose the Right IGRP?<\/strong><\/h2>\n

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Choosing the right Interior Gateway Protocol depends on the size of your network and how much control you need over routing. For smaller networks with limited routers, simpler protocols like RIP can work, since they are easy to configure and maintain. However, as the network grows, limitations such as hop count and slower updates can become a problem.<\/p>\n

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For medium to large networks, protocols that consider multiple factors like bandwidth and delay are more suitable. IGRP was designed to meet these requirements, especially for Cisco-based environments. It offers better route selection than basic hop count methods.<\/p>\n

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Understanding network size, performance needs, and hardware compatibility helps in selecting the most appropriate IGP.<\/p>\n

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Limitations of <\/strong>IGRP<\/strong> in Modern Networks<\/strong><\/h2>\n

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While IGRP was effective when it was first introduced, it has certain limitations that make it less common today. One major drawback is that it is a Cisco proprietary protocol, which limits its use in mixed vendor environments. It also does not support variable-length subnet masks, reducing flexibility in network design.<\/p>\n

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Another limitation is its slower convergence as compared to newer protocols. Routing updates are exchanged at fixed intervals, which can delay response to network changes. Because of these reasons, IGRP has largely been replaced by other advanced alternatives in modern networks.<\/p>\n

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Useful Tips for Working With <\/strong>Interior Gateway Protocols<\/strong><\/h2>\n

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