Explanation:
In general, load balancing is the capability of a router to distribute traffic over all the
router network ports that are the same distance from the destination address. Load
balancing increases the utilization of network segments, and so increases effective
network bandwidth. There are two types of load balancing:
1. Equal cost path
2. Unequal cost path
EIGRP Load Balancing:
Every routing protocol supports equal cost path load balancing. In addition, Interior
Gateway Routing Protocol (IGRP) and EIGRP also support unequal cost path load
balancing. Use the variance n command in order to instruct the router to include routes
with a metric of less than n times the minimum metric route for that destination. The
variable n can take a value between 1 and 128. The default is 1, which means equal cost
load balancing. Traffic is also distributed among the links with unequal costs,
proportionately, with respect to the metric.
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