EIGRP is a open standard since 2013,it was Cisco propitiatory.
Advanced Distance vector Routing protocol,it using DUAL Algorithm
Classless and it support VLSM,FLSM,CIDR, Auto&Manual Summary
Internal AD is 90 and External AD is 170
It sends updates as a Multicast(188.8.131.52)and Unicast
Maximum Hops is 255(default 100)
it support IP(version 4 and 6), IPX and Apple talk
default k values K1=1 k2=0 k3=1 k4=0 k5=0