Enhanced IGRP may be configured to discover neighbouring routers dynamically (default) or via manual administrator configuration. Both methods, as well as other EIGRP neighbour-related topics, will be described in the following sections.
Dynamic Neighbour Discovery
Dynamic neighbour discovery is performed by sending EIGRP Hello packets to the destination Multicast group address 220.127.116.11. This is performed as soon as the network command is issued when configuring EIGRP on the router. In addition, as stated earlier, EIGRP packets are sent directly over IP using protocol number 88. Figure 36.4 below illustrates the basic EIGRP neighbour discovery . . .
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