So, in order for the global routing table to have EIGRP routes in it, EIGRP has to first be enabled, then go through a process through with it determines which routes are Feasible successors (Best routes) and only then install them to the global routing table.
EIGRP has five basic messages it uses for this EIGRP collaboration between its neighbors.
EIGRP is a Cisco proprietary protocol. If you don’t mind being locked in using a vendor specific protocol you will then enjoy using a robust, well-developed protocol that will meet most enterprise network needs. Here are a few basic bullet points about EIGPR:
Out of the many dynamic routing protocols RIP or RIPv2 is probably the most basic and easy to setup. The biggest difference between RIP and RIPv2 is that RIP does not support VLSM (Variable Length Subnet Masking) and RIPv2 does. For the modern network we need to use at least RIPv2 for proper routing.
In order to have packets flowing through the modern network you need Physical Equipment (Layer 1), you need aggregated devices such as switches for quick transport (layer 2), and finally you need routers/layer 3 switches that can route traffic on an ip network (layer 3). Each hop or interface along a path needs to have a layer 3 ip address IPv4 or IPv6 in order for the packet to traverse the ip network. The way that all layer 3 devices make decisions to forward traffic is a routing table. The three ways a layer 3 devices learns and adds routes to its routing table are: