EIGRP and IGRP lab

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Mar 16th, 2009
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I finished a CCNA course and managed to setup at home a small OSPF network, then moved onto a EIGRP network and all worked, however I have noticed we missed the IGRP routing protocol on the course. Is this just the same as EIGRP but internal on a LAN?

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adamclarkuk_2 Mon, 03/16/2009 - 07:46
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IGRP is the older version for EIGRP. IGRP is a true distance Vector Protocol where as EIGRP is a hybrid protocol bringing the advantages of both models ( Link State and Distance Vector) into 1 protocol.

Here are some of the comparisons :-

# Both are Cisco Proprietary protocols.

# Both have same logic for equal cost paths.

# IGRP and EIGRP path selection is based on Bandwidth/Delay metric. Using some EIGRP commands maximum bandwidth can be changed as required while in IGRP it cannot be changed.

# Both have same metric accumulation, if divide the EIGRP metric by 256.

# EIGRP has fast convergence time while IGRP has a slow convergence time.

# IGRP sends full routing table during update while EIGRP does not.

# IGRP requires Distance Vector loop avoidance features while EIGRP does not.

# EIGRP uses Dual algorithm while IGRP uses Bellman and Ford algorithm.

# IGRP send periodic routing updates every 90 seconds while EIGRP send triggered change-based updates when there is a topology change has occurred.

I beleive that it has also been removed from the exam as it is being removed from new IOS versions aswell.


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