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Difference between IGRP and EIGRP

Difference between IGRP and EIGRP

There are a few different routing protocols that can be used on Cisco routers, but two of the most popular are IGRP and EIGRP. They both have their pros and cons, but which one is right for your network? Let’s take a closer look at the differences between IGRP and EIGRP to help you decide.

What is IGRP?

  • IGRP is an internetworking protocol that was developed by Cisco Systems in the early 1990s. IGRP is a distance-vector routing protocol that uses hop count as its metric. IGRP sends periodic updates every 90 seconds and uses composite metrics to calculate the best route to a destination. IGRP has been superseded by more advanced protocols such as EIGRP and OSPF, but it remains in use on older Cisco equipment.
  • IGRP is a Classless Interior Gateway Routing Protocol (CIGRP), which means that it does not support subnetting or route summarization. IGRP uses the same algorithms as RIP, but it includes additional information in its routing updates. IGRP is proprietary to Cisco equipment and cannot be used on non-Cisco routers.
  • IGRP has been replaced by EIGRP on newer Cisco equipment. EIGRP is an enhanced version of IGRP that supports variable-length subnet masks (VLSM) and summarization at network boundaries. OSPF is a link-state routing protocol that is widely used in enterprise networks. OSPF uses a different routing algorithm than IGRP, which results in faster convergence times after network changes.

What is EIGRP?

EIGRP is a routing protocol that falls into the category of Interior Gateway Protocols (IGPs). EIGRP uses an advanced algorithm known as the Diffusing Update Algorithm (DUAL) to determine the best route to a destination. EIGRP is a proprietary protocol developed by Cisco, and as such, it can only be used on Cisco routers. EIGRP supports IPv4 and IPv6, making it a versatile option for network admins. EIGRP is often used in enterprise networks because of its stability and relatively low bandwidth usage. EIGRP converges quickly after a change in the network, which minimizes downtime. Overall, EIGRP is a reliable and efficient routing protocol that offers many benefits for enterprise networks.

Difference between IGRP and EIGRP

IGRP (Interior Gateway Routing Protocol) and EIGRP (Enhanced Interior Gateway Routing Protocol) are two of the most commonly used routing protocols. IGRP is a Distance Vector protocol, while EIGRP is a Link State protocol. IGRP uses the Bellman-Ford algorithm, while EIGRP uses the DUAL algorithm. IGRP sends updates every 90 seconds, while EIGRP sends updates only when there is a change in the network. IGRP uses bandwidth and delays as metrics, while EIGRP uses bandwidth, delay, load, and reliability as metrics.

IGRP sends the full routing table to all neighbors, while EIGRP sends only updated routes to all neighbors. IGRP supports only classful routing, while EIGRP supports both classless and classful routing. IGRP has a maximum hop count of 100, while EIGRP has a maximum hop count of 255. IGRP cannot be configured manually on Cisco devices, while EIGRP can be configured manually on Cisco devices. IGRP uses AS number 1 by default, while EIGRP uses AS number 65535 by default.


In this article, we’ve outlined the main differences between IGRP and EIGRP. We hope that you now have a better understanding of which routing protocol is best for your organization.

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