Ant Corse Work

Advance Network Technology Analyzing Switched Ethernet Using OPNET

CONTENTS:

1. Introduction 2. Traffic details of the network. 3. Simulation and Results 4. Characteristics and tables 5. Justification 6. Conclusion 7. References

Introduction: OPNET is a network simulation tool which stands for Optimized Network Engineering Tools. It is not only a network application tool that is used to design a simulation network but also manages the network tools. OPNET comes with some of the toolsets listed below 1. Protocols defined in packet format 2. Network topology and link connections defined by project window. 3. Interface of a network component specified by node model. OPNET is a simulator that is built on top of every discrete event system. The system behavior is simulated by modeling each and every event that is happening in the system and processed by user defined system. To organize all the models to be built in the network it uses hierarchy models. This software is mainly used to test and design the performance of network characteristics, db entry, ftp, db query, accounts , Ethernet , average response time etc where we have the capability of changing the predefined networks and edit the attributes. OPNET controls the traffic by modeling network and application users. Now let us consider a company network where I am going to describe my course work in detail. In this company network we will be having mainly two blocks Profile definitions and Application definitions. In Profile definitions we are going to describe about the users. There are several types of applications that are predefined in the Application definition block. In this course work we need to initiate and simulate an office network and check the network performances of the servers. This network consists of four switches, of which one switch is used as central switched and remaining three switches 1; switch 2 and switch 3 are located in different rooms. These switches S1, S2, S3 are connected with 100Base T links. These three switches are then in turn connected to server with 10BaseT links. The first switch S1 is now connected to development

server, switch S2 in connected to human recourses, receptionist, accounting and switch S3 is connected to Sales server. Staff

Working hours 8am to 6pm

Receptionist

Departments

Applications

Switches

Email(heavy) General

Human resource

9am to 5 pm

General

Recruiting

9 am to 5 pm General

Accounts

10am to 4pm General

Sales

8 am to 8 pm Sales

Development

11 am to 7 pm

Development

S2 Email(light), Web browsing(light), file print(light) Email(light), Web browsing(light), file print(light) Database (heavy) and file printing (heavy) Database (light), e-mail (heavy), FTP (light) Web browsing (heavy), Database (heavy), FTP (heavy) and e-mail (light)

S2

S2 S2 S3

S1

Here we need to design and prepare four scenarios. So let us discuss about them now. 1. In the First scenario, all servers in the company network will support all applications where as only the client applications will be allowed to access any server.

2. In the second scenario, only one client application will be supported by each server and runs on the local machines and the staff will have access to only that server of that particular department. 3. In the Third scenario we need to remind the first scenario case and do the same process by adding additional networks to the given network. We are adding additional networks as these applications use 10Base T links and 100BaseT links. And the process is same as equal to first scenario i.e. (1=3). 4. In the last fourth scenario, we do repeat the process same as second scenario, again by adding additional networks as we have done in third scenario. The process is again same as second case i.e. (2=4).

In our company network, all servers will support all client applications. Hence we need to edit and design the attributes of those applications. Here we have to add 6 new applications in the application definition and name

them as receptionist, human resources, accounting, sales, recruiting and development. For each application we need to provide with valid start time and end time. From the above we can notice that all staff in the network starts the work at different timings. Here I assumed that all the staff of the company starts the work 1 hr earlier to their start time i.e. for receptionist they start at 7 am. Sales staffs are going to leave the office late as they work till 8pm. So the average duration of time they work is 12 hrs, but we assumed that the office starts running from 7 am, so the average working duration of the network is 13hours. We can see this, we run the program and is shown below.

For each profile we have to assign applications. We can do this by assigning attributes to every profile. For example, by selecting an

Email (heavy) application in the first profile and doing same procedure for remaining profiles. And the operation mode must be kept in simultaneous mode as we run all applications at the same time and the end time (Repeatability) must me once at start time. These calculations are shown in the table shown below.

Applications

Start Time in Sec Duration in Sec

Operation Mode

Receptionist

3600

36000

Simultaneous

Human Resource

7200

7200

Simultaneous

Recruiting

7200

7200

Simultaneous

Accounts

10800

21600

Simultaneous

Sales

3600

43200

Simultaneous

Development

14400

28800

Simultaneous

Thus from the above table we had calculated the start time and total duration of the work in seconds. And the operation mode is kept in simultaneous mode for all applications as all the applications run simultaneously. Basing on the calculations we save the save the network and run the program. As soon as we click the run Option, the program runs and if it is successful, a window will appear show shown below.

RESULTS: Thus from the above discussion, we can analyze the performance characteristics of all the four scenario simulations. Comparisons have been made for each selected parameters and their corresponding results are known. All these parameters are listed in the given table below, to make the comparison easy between the scenarios. With the help of these parameters the performance of the network can be made easy. As we have created six applications, we are going to compare the parameters for the four scenarios.

Global Characteristics: 1. Db Entry: Parameter

Scenario1

Scenario2

Scenario3

Scenario4

Response time (sec) Traffic received(Bytes/sec ) Traffic received( Packets/s ec) Traffic sent( Bytes/sec)

0.026576

0.015767

0.042650

0.015462

5986.284

6128.342

17563.27

3726.437

0.549242

0.534532

0.781624

0.345345

5986.284

6128.342

17563.27

3726.437

Traffic sent(Packets/sec)

0.549242

0.534532

0.781624

0.345345

Graph:

Db Query: Parameter

Scenario1

Scenario2

Scenario3

Scenario4

Response time (sec) Traffic received(Bytes/sec) Traffic received( Packets/s ec) Traffic sent( Bytes/sec)

0.026865

0.015345

0.276384

0.015875

6023.192

6452.043

9876.276

3778.284

0.543484

0.534532

0.776353

0.352895

6023.192

6452.043

9876.276

3778.284

Traffic sent(Packets/sec)

0.127363

0.1498547

0.867363

0.773463

3. EMAIL: Parameter

Scenario1

Scenario2

Scenario3

Scenario4

Response time (sec) Traffic received(Bytes/sec) Traffic received( Packets/s ec) Traffic sent( Bytes/sec)

0.11256

0.014728

0.012281

0.015256

327.1429

287.3476

294.6473

287.3563

0.223765

0.136547

0.245322

0.134589

327.1429

287.3476

294.6473

287.3563

Traffic sent(Packets/sec)

0.223765

0.136547

0.245322

0.134589

FTP: Parameter

Scenario1

Scenario2

Scenario3

Scenario4

Response time (sec)

0.5329

0.035738

0.52378

0.0274536

Traffic received(Bytes/sec)

321.1345

286.3487

398.45634 273.4536

Traffic received( Packets/sec

0.015648

0.12456

0.012454

Traffic sent( Bytes/sec)

321.1345

286.3487

398.45634 273.4536

Traffic sent( Bytes/sec)

0.042367

0.026743

0.038463

0.023443

Upload response time

0.46524

0.024674

0.065983

0.024532

HTTP:

0.013432

Parameter

Scenario1

Scenario2

Scenario3

Scenario4

Object Response time (sec) Page Response time Sec Traffic received( Bytes/sec ) Traffic Received( Packets/ sec) Traffic sent(Bytes /sec)

0.00673

0.00635

0.0046372

0.001254

0.008763

0.002361

0.0126734

0.002732

520.3428

420.0938

490.5673

409.4326

0.67382

0.47262

0.590363

0.398723

520.3428

420.0938

490.5673

409.4326

Traffic sent(Packets/sec)

0.673532

0.467292

0.62539

0.438272

Scenario1

Scenario2

Scenario3

Scenario4

Traffic 375.4532 received(Bytes/sec) Traffic 0.067362 received( Packets/s ec) Traffic 375.1429 sent( Bytes/sec)

178.0392

367.9182

189.3723

0.023637

0.078367

0.037465

178.0392

373.6473

189.3723

Traffic sent(Packets/sec)

0.023637

0.078367

0.037465

Print: Parameter

0.067362

Graph:

Justification: Let Us review and justify our observations and descriptions. In the given company network, we will not make any changes or modifications in the application definition as they already have well predefined applications. Only in Profile definitions we have to change the applications in each and every profile. Only the client has access and performs same applications in all the scenarios. Hence we have created six profiles in all the scenarios. In the first scenario, at every server we should select ‘All’ for supported services, as they support all the applications. All the applications must me mentioned at every server in the second scenario. Profile name also must me mentioned at each and every node.

And the same process should be repeated for second and third scenarios and back ground traffic of 10Baset links and 100Base T links should be added to the network. Hence, finally the duration of the simulation time must be 13hrs as the network runs from morning 7 am to 8 pm. Thus the network performance can be found with the help of these profiles and applications. Conclusion: I am going to conclude my calculations and observations made in this course work. This helped me a lot in order to know the simulation tools being used in present technologies. With the help of this back ground load we will be able to distinguish the difference in the network. On the other hand, they will be so many negative factors affecting the performances of the network while we run the network. In order to rectify and analyze these problems, we must provide better network and different scenarios. If we do the first scenario perfectly, I think we can do remaining scenarios perfectly according to my observations and calculations I made this conclusion. Reference: 1. Teach Mat 2. www.opnet.com 3. https://cms1.gre.ac.uk/teachmat0809/COMP1266/course/schedule.asp? banner=COMP1266