See cisco site: the most comprensive routing source in Internet. See login: an Italian magazine about networking by Infomedia. See an article talking about cisco 2511, the most used router all around the world. See an article talking about IP routing (an introduction). See an article talking about RIP and Autonomous Systems. See an article talking about IGRP, EIGRP, OSPF.

What are IP routing Protocols?

IP routing protocols are divided into two classes: interior gateway protocols (IGPs) and exterior gateway protocols (EGPs).

The Interior Gateway Protocols

Interior protocols are used for routing networks that are under a common network administration. A routing process listens to updates from other routers on these networks and broadcasts its own routing information on those same networks. The most common interior routing protocols supported are:

• Internet Gateway Routing Protocol (IGRP)

• Enanched IGRP (E-IGRP)

• Open Shortest Path First (OSPF)

• Routing Information Protocol (RIP)

• Intermediate System-to-Intermediate System (IS-IS)

The Exterior Gateway Protocols

Exterior protocols are used to exchange routing information between networks that do not share a common administration. IP exterior gateway protocols require three sets of information before routing can begin:

• A list of neighbor (or peer) routers with which to exchange routing information

• A list of networks to advertise as directly reachable

• The autonomous system number of the local router

The most common exterior routing protocols are:

• Border Gateway Protocol (BGP)

• Exterior Gateway Protocol (EGP) [OBSOLETE]

Antonio Gullì
gulli@di.unipi.it