February 2000
Intermediate to advanced
387 pages
7h 36m
English
Content preview from IP Routing Protocols
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INTERNAL AND EXTERNAL GATEWAY PROTOCOLS
Figure 3-2 depicts internal and external gateway protocols. When ARPAnet was first implemented, it consisted of a single backbone network. With the implementation of Internet, ARPAnet then provided attached routers to local networks. A protocol, called the Gateway-to- Gateway Protocol (GGP), was used for these routers to inform each other about their attached local networks. Traffic passing between two local networks passed through two routers, and each router had complete routing information about the other core router. Since these routers had complete routing information, they did not need a default route.
Figure 3-2. External Gateway Protocols (EGP) and Internal Gateway Protocols (IGP)
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