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包交换实验是OPNET14.5初学者必掌握的实验之一,由于目前网络上的中文教程通常受限于翻译者的水平,可能出现翻译不准确,实验过程描述不清晰等问题,这里提供了OPNET14.5 包交换实验的官方实验教程,清晰准确,简单明了,根据教程一步步做就可以成功得到实验结果。不过由于本教程是英文原文,所以可能对小伙伴们的英文略有要求,不过相信只要顺利通过四级就完全可以轻松搞定,若有问题也可借助翻译软件看懂教程。最后,希望这份资源可以帮助到大家哦~~
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1
Packet Switching I
Introduction
In this tutorial, you simulate the behavior of a packet
switching network. As part of creating the network, you
will use the packet and link editors, new Kernel
Procedures, and define your own statistics.
You will also
• Learn some principles of model design
• Become more familiar with process and node
models and how they function in a network model
• Do parametric studies of various statistics
2
In a simple packet switching network, the performance
of the network can be measured by the end-to-end
delay experienced by traffic on the network.
In this lesson, your goal is to model a simple network
in which four peripheral nodes generate traffic while a
central hub node relays the traffic to the appropriate
destination within the network.
A Small Packet Switching Network
3
Getting Started
There are several design concepts you should
consider before you start building the network model:
• Network topology and the physical
communication medium
• The functions of the different node types
• The method the process model uses to determine
which point-to-point transmitter addresses a
particular peripheral node
• The role of peripheral nodes
4
Network Topology
The initial network will consist of four peripheral nodes
connected to a hub node by point-to-point links.
Point-to-point links can either be simplex
(unidirectional) or duplex (bidirectional). In this case,
you will use custom duplex links to connect
transmitter-receiver pairs. Looking only at the
communications medium as represented, the network
would look like this:
Communications Medium of the Network
peripheral nodes
duplex point-to-point link
point-to-point receiver
point-to-point transmitter
hub node
5
Functions of the Different Node Types
The purpose of the model is to simulate packets
traveling from one peripheral node to another
peripheral node through the packet switching hub
node. In the hub node, you can assume that packets
containing destination addresses will arrive randomly
on the four incoming links from the four peripheral
nodes. The destination address is an integer value
specifying a destination peripheral node. The hub
node must contain a process model that can retrieve
the incoming packets, read the destination address,
and send the packets to the appropriate point-to-point
transmitter.
Different Node Types
peripheral nodes
hub node
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