Routing Information Protocol (RIP) is an example of a routing
protocol.
Routing protocols describe the following information:
?– How updates are conveyed
?– What knowledge is conveyed
?– When to convey the knowledge
?– How to locate recipients of the updates
You can classify dynamic routing protocols using many different methods. One method to classify
a routing protocol is to determine if it is used to route in an autonomous system or between
autonomous systems. An autonomous system is a collection of networks under a common
administration that share a common routing strategy.
There are two types of routing protocols:
?– Interior Gateway Protocols (IGP): These routing protocols exchange routing information
within an autonomous system. Routing Information Protocol version 2 (RIPv2), Enhanced
Interior Gateway Routing (EIGRP), and Open Shortest Path First (OSPF) are examples of
IGPs.
?– Exterior Gateway Protocols (EGP): These routing protocols are used to route between
autonomous systems. Border Gateway Protocol (BGP) is the EGP of choice in networks
today.
100 Chapter 3: Medium-Sized Routed Network Construction
Figure 3-2 shows the logical separation of where an IGP operates and where an EGP operates.
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