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EIGRP and IGRP are similar in some ways, but they differ in other ways. EIGRP and IGRP use the same equation to calculate metrics to the destination network. EIGRP and IGRP also use the same technique in doing unequal -cost load balancing. However, EIGRP keeps a topol-ogy table of the network and uses the DUAL algorithm to select a loop-free path . EIGRP uses the notions of successor and feasible successor and the query process to achieve fast convergence. EIGRP also carries the subnet mask information when sending out routing update. This enables EIGRP to support discontiguous networks and VLSM, which makes EIGRP a scalable routing protocol capable of fitting today's network requirements. Table 6-1 shows the summary comparison between IGRP versus EIGRP. Table 6-1. Comparison Table of IGRP Versus EIGRP
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