Introducing the Long List of Routing Protocols
Over the years, many different routing protocols have been
developed. To exchange routing information as in the examples in this chapter,
the routers would use a single routing protocol. Each router would use the same
routing protocol.
However, you have a choice as to which routing protocol to use.
The details of why you would choose one routing protocol over another is beyond
the scope of this book. However, to have a conversational knowledge of
networking, you should at least know the names of the IP routing protocols and a
few basic facts about each. For instance, some routing protocols are defined as
public Internet standards in RFCs, whereas others are proprietary from Cisco
Systems, which has a significant percentage of the router product market. Also,
one routing protocol in particular, Border Gateway Protocol (BGP), is intended
for use between Internet service providers (ISPs) and their customers, whereas
most others are more appropriate for use inside a single company or
organization. A routing protocol that is designed for use inside a company is
called an Interior Routing Protocol, and
one that is designed for use between different companies is called an Exterior Routing Protocol. Table 12-1 lists the protocols, along with
some of these comparison points.
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