Chapter 1 Ip Routing Protocol Overview; Introduction To Ip Route And Routing Table; Ip Route - H3C S7500 Series Operation Manual

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Operation Manual – Routing Protocol

H3C S7500 Series Ethernet Switches

Chapter 1 IP Routing Protocol Overview

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Routing Management Policy

When running a routing protocol, the Ethernet switch also functions as a router. The

term "router" in this document refers to a router in a generic sense or an Ethernet

switch running routing protocols.

1.1 Introduction to IP Route and Routing Table

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

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.

Each entry in a routing table contains:

Destination address: It identifies the address of the destination host or network of

an IP packet.

Network mask: Along with the destination address, it identifies the address of the

network segment where the destination host or router resides. By performing

"logical AND" between destination address and network mask, you can get the

address of the network segment where the destination host or router resides. For

example, if the destination address is 129.102.8.10 and the mask is 255.255.0.0,

the address of the network segment where the destination host or router resides

Chapter 1 IP Routing Protocol Overview

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