Re: Re: Routing protocols, Internet vs Enterprises

[cstubbs () gmail com]

Very much in agreement there, even in a simple network routing protocols can produce a lot of benefit even if only 
through simplified provisioning of new sites/ports etc.

To the original poster, there's been some weird misleading responses here - though the Wikipedia links are good. 

Take a step away from thinking of routing protocols as intended for Internet or Enterprise use. Various protocols can 
be used in both situations but for different reasons and within different contexts.

Having worked for ISP's, in particular those using MPLS and integrating customers using various routing protocols it is 
not uncommon for an ISP (a segment of the Internet) to use OSPF, EIGRP, ISIS and BGP simultaneously.

Think rather that different protocols are used for doing different things. Choose the best available tool for the job 
so to speak.

BGP (an EGP) is intended for use when interconnecting different networks (AS's), whether they be different ISP's or 
different segments of a multinational company. It's basic purpose is to provide information about a network and about a 
*possible* path to that network.

OSPF, EIGRP, ISIS and other IGP's are intended for use within a single network (AS) in order to provide information 
about the best route (or routes) to specific subnets or hosts within the network.

That's my two cent brain fart summary of the difference anyway. RIP and IGRP are no longer of much relevence to anyone 
unless you're studying for a CCNA or similar certification.