Dynamic routing is when protocols are used to find networks
and update routing tables on routers. Using dynamic routing is easier than
using static or default routing, but it’ll cost you more in terms of router CPU
processes and bandwidth on the network links. A routing protocol defines the
set of rules used by a router when it communicates routing information between
neighbor routers.
Two types of routing protocols are used in internetworks:
interior gateway protocols (IGPs) and exterior gateway protocols (EGPs). IGPs
are used to exchange routing information table with routers in the same
autonomous system (AS). An AS is a collection of networks under a common
administrative domain, which basically means that all routers sharing the same
routing table information are in the same AS. EGPs are used to communicate
between ASes. An example of an EGP is Border Gateway Protocol (BGP). Routing protocols are essential to dynamic
routing. There are three different kinds of routing protocols. See Types of routing protocols
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