Today the consultant and I just went through the design and made sure we had all the routes in place. We are moving from a network that covers 5 floors but is a single flat network (VLAN 1) to a multi VLAN network. Each of the floors will be it's own VLAN. Think of each floor as their own network. With this configuration I need to make sure all clients can connect to each other, the servers and connect to our London and Shanghai networks. Thank God for EIGRP. Without EIGRP our routing table would be at arms length. Meaning that I would have had to tell the router that every VLAN exist, where they are and what path they need to take to get to their destination. I would have to think like a router while entering all of these routes in the routing table. I don't have to do that with EIGRP.
**What is EIGRP?
Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary routing protocol based on their original IGRP. EIGRP is a balanced hybrid IP routing protocol, with optimizations to minimize both the routing instability incurred after topology changes, as well as the use of bandwidth and processing power in the router.
Some of the routing optimizations are based on the Diffusing Update Algorithm (DUAL) work from SRI, which guarantees loop-free operation. In particular, DUAL avoids the "count to infinity" behavior of RIP when a destination becomes completely unreachable. The maximum hop count of EIGRP-routed packets is 224.**
Or just look at the pic to get a better idea of what it is and does.
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