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22 Using Enterprise Edge Services

Enterprise Edge Networking Operations Guide P0910464 Issue 01

IP Routing

This section includes information on:

• IP Routing Overview

• Enterprise Edge IP routing specifics

• IP addressing overview

• Static routing

• Routing Information Protocol (RIP)

• Packet Filtering

– source address

– destination address

– IP Protocol ID

– TCP Port

– UDP Port

– ICMP Type

– ICMP Code

• LAN to WAN routing

– managing traffic using Interrupt Modulation

• LAN to LAN routing

– Fast Path Routing

IP Routing Overview

The Internet Protocol (IP) is the protocol used on the Internet to send data is sent

from one computer to another. Each computer on the Internet, called a "host", has

at least one address that identifies it from all other computers on the Internet. When

you send or receive data (for example, an e-mail or a web page), the message gets

divided into units called packets. Each of these packets contains both the sender's

Internet address and the receiver's Internet address.

A packet is first sent to a router that understands reads the destination address and

forwards the packet to an adjacent router that reads the destination address.This

routing process continues across the Internet until one router recognizes the packet

as belonging to a computer in its immediate neighborhood or domain. That router

forwards the packet to the computer whose address is specified.

Because a message is divided into a number of packets, each packet can, if

necessary, be sent by a different route across the Internet. Packets can arrive in a

different order than the order they are sent. Another protocol, the Transmission

Control Protocol (TCP) to put the packets in the right order.

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