This section describes the different types of messages used by EIGRP. However, before delving into the specifics of the different message types, it is important to have a solid understanding of the EIGRP packet header, wherein these messages are contained.
EIGRP Packet Header
Although going into specifics on the EIGRP packet formats is beyond the scope of the CCNA exam requirements, a fundamental understanding of the EIGRP packet header is important in order to understand completely the overall operation of the EIGRP routing protocol. Figure 36.1 below illustrates the format of the EIGRP packet header:
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