Enhanced Interior Gateway Routing Protocol (EIGRP) is a unique protocol considering 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. This protocol is not suitable in a multi-vendor architecture. Similar to RIPv2, EIGRP is a classless protocol that allows for VLSM. Another similarity between the two protocols is their automatic summarization behavior . . .
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