How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP? - Cisco Systems

How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP? - Cisco Systems

Introduction
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:

• Equal cost path
• Unequal cost path

This document explains how unequal cost path load balancing works in Enhanced Interior Gateway Routing Protocol (EIGRP).