I also spent time learning about the neighbor table, topology table, and routing tables EIGRP use to determine the best route or Successor route. I spent time going through the 5 types of packets EIGRP uses for making this routing protocol works. Hello’s, Updates, Queries, Replies, and ACK (Acknowledgements) are all used in conjunction to make EIGRP work.

EIGRP is unusual like is predecessor in that it’s metric is not a cumulative value of one single path value such as hop count or bandwidth but a collection of interface values. This collection of values goes to create a metric called a Composite.