Disadvantages of EIGRP Protocol?

The fact that it's Cisco-exclusive is the biggest drawback, but it also doesn't operate very well in huge networks. Finally, its features aren't sufficient to rival ospf. coreball

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The networks that use EIGRP are considered "flat." It lacks the spatial ideas of other languages. slime rancher 2

• Flat Networks – EIGRP doesn’t have an Area like concept, so it is not good at dealing with big hierarchal network. When running OSPF on a big network, we can make the network hierarchal by dividing the network into areas.  Though we can separate the network into different EIGRP (AS) domain, then import routing table to each other, but it is not an optimal network design, and very few network has been designed like this.
• No support for DoD – EIGRP maintains the adjacency relationship by sending HELLO message to each other periodically, even though running on dial up link. However, the HELLO message may bring the dial link up, this is not what we want on a dial up link, and especially the dial up link is a backup link. When we run EIGRP on a dial up link, in order to prevent this from happening, we usual put a Dialer list and Dialer group on the interface so as not to let the HELLO message bring the dial link up.

EIGRP is a Flat Networks. it is not having area like concepts

Main disadvantage is it's cisco proprietary, second thing it's doesn't fit well in large network. Third thing is it's feature aren't enough to compete with ospf. 

EIGRP is a proprietary solution from Cisco, So wont be available with rest of the vendors.

EIGRP doesn’t have an Area like concept, so it is not good at dealing with big hierarchal network.