EIGRP is a unique protocol because it uses a hybrid approach, combining distance vector and link-state characteristics. Combining these features makes EIGRP very robust and allows for fast convergence, even in large topologies. The first thing a network designer should consider is that EIGRP is a Cisco proprietary protocol, so it can be used only in environments that contain Cisco devices. Like RIPv2, EIGRP is a classless protocol and it allows for VLSM. Another similarity between the two protocols is their automatic summarization behavior, but this can be disabled just as easily.
The algorithm that EIGRP uses . . .
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