
1-1
Chapter 1
IP Concepts, Terminology, and Features
The following sections introduce concepts and terminology used in this manual:
• IP Router Functions - page 1-1
• IP Datagrams - page 1-2
• IP Addresses - page 1-3
• Autonomous Systems and Routing Protocols - page 1-8
• Route Preferences - page 1-11
• Route Weights - page 1-12
• IP Routing Policies and Filters - page 1-14
• IP Traffic Filters - page 1-15
• RFC Compliance - page 1-15
IP Router Functions
An IP (Internet Protocol) router performs three basic functions:
• Acquires knowledge of other routers and hosts on the network
IP routers use routing protocols — for example, OSPF and BGP — to learn
transmission paths (or routes) to other networks and to hosts residing on
networks directly connected to the router.
• Stores network topology information about transmission paths in routing
tables
• Selects the best path, based on the information in its routing tables, for a
particular
datagram
(a self-contained unit of data) to reach its destination
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