Avaya Configuring IP Services Manuale Utente Pagina 13

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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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