Introduction To Ip Route And Routing Table; Chapter 1 Ip Routing Protocol Overview; Ip Route - H3C S5600 Series Operation Manual

Operation Manual – Routing Protocol
H3C S5600 Series Ethernet Switches

Chapter 1 IP Routing Protocol Overview

Go to these sections for information you are interested in:

Introduction to IP Route and Routing Table

Routing Protocol Overview
Displaying and Maintaining a Routing Table
Note:
The term router in this chapter refers to a router in a generic sense or an Ethernet
switch running a routing protocol.
1.1 Introduction to IP Route and Routing Table

1.1.1 IP Route

Routers are used for route selection on the Internet. As a router receives a packet, it
selects an appropriate route (through a network) according to the destination address
of the packet and forwards the packet to the next router. The last router on the route is
responsible for delivering the packet to the destination host.
1.1.2 Routing Table
I. Function
The key for a router to forward packets is the routing table. Each router maintains a
routing table. Each entry in this table contains an IP address that represents a
host/subnet and specifies which physical port on the router should be used to forward
the packets destined for the host/subnet. And the router forwards those packets
through this port to the next router or directly to the destination host if the host is on a
network directly connected to the router.
Routes in a routing table can be divided into three categories by origin:
Direct routes: Routes discovered by data link protocols, also known as interface
routes.
Static routes: Routes that are manually configured.
Dynamic routes: Routes that are discovered dynamically by routing protocols.
II. Routing entry
Each routing entry in a routing table contains:
Chapter 1 IP Routing Protocol Overview
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