This chapter covers the following key topics about Interior Gateway Routing Protocol (IGRP):
In the mid-1980s, Cisco developed its own proprietary routing protocol, Interior Gateway Routing Protocol (IGRP), as a solution to some of the shortcomings of RIP, such as the hop-count limitation of 15.
Like RIP, IGRP is a distance vector protocol. However, IGRP calculates its composite metric from a variety of variables, such as bandwidth and delay, and hop count is not considered in the routing decision. IGRP uses variables ...