EIGRP is an enhanced version of IGRP, hence the name. It uses the same distance vector technology. The changes were effected in the convergence properties and the operating efficiency of the protocol. It has some characteristics similar to those of a link-state routing protocol. Therefore, it is sometimes referred to as a hybrid routing protocol, although Cisco calls it an advanced distance vector protocol. It is an efficient, although proprietary, solution to networking large environments as it scales well. Its ability to scale is, like OSPF, dependent on the design of the network.
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