Enhanced Internal Gateway Routing Protocol EIGRP is an enhanced version of the IGRP protocol. IGRP is an internal gateway route selection protocol provided by Cisco for TCP / IP and OSI Internet services. It is considered an internal gateway protocol, and an external gateway protocol selected as a domain, it has not been universally applied.
The main difference between Enhanced IGRP and other routing protocols includes: Fast Convergence, supports the expansion of subnet mask, partial update, and multi-network protocols. The router that performs Enhanced IGRP stores all its neighboring routing tables to facilitate it to quickly take advantage of Alternate Routes. If there is no suitable path, Enhanced IGRP queries its neighbors to get the required path. The enhanced IGRP query will end until the appropriate path is found, otherwise it will continue.
The EIGRP protocol is polymerized for all EIGRP routing, thereby reducing routing information transmission, saving bandwidth. In addition, the EIGRP protocol can support routing aggregation on bit boundary routers of any interface.
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