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Variance is a unique feature of IGRP (and EIGRP) that distinguishes it from RIP. Variance is basically a way to load-balance the traffic on unequal -cost paths. All routing protocols support equal-cost-path load balancing, but only IGRP and EIGRP support unequal-cost- path load balancing, which is configured using a variance command. Configuration of variance is easy, as long as you know the concept behind it. The variance command instructs the router to include routes with a metric smaller than n times the minimum metric route for that destination, where n is the number specified by the variance command. |
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