Ant Corse Work

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    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

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    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 format2. 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 andsimulate 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

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    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

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    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

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    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.

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    Global Characteristics:

    1. Db Entry:

    Parameter Scenario1 Scenario2 Scenario3 Scenario4

    Response time

    (sec)

    0.026576 0.015767 0.042650 0.015462

    Traffic

    received(Bytes/sec

    )

    5986.284 6128.342 17563.27 3726.437

    Traffic

    received( Packets/s

    ec)

    0.549242 0.534532 0.781624 0.345345

    Traffic

    sent( Bytes/sec)

    5986.284 6128.342 17563.27 3726.437

    Traffic

    sent(Packets/sec)

    0.549242 0.534532 0.781624 0.345345

    Graph:

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    Db Query:

    Parameter Scenario1 Scenario2 Scenario3 Scenario4

    Response time

    (sec)

    0.026865 0.015345 0.276384 0.015875

    Traffic

    received(Bytes/sec)

    6023.192 6452.043 9876.276 3778.284

    Traffic

    received( Packets/s

    ec)

    0.543484 0.534532 0.776353 0.352895

    Trafficsent( Bytes/sec)

    6023.192 6452.043 9876.276 3778.284

    Traffic

    sent(Packets/sec)

    0.127363 0.1498547 0.867363 0.773463

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    Parameter Scenario1 Scenario2 Scenario3 Scenario4

    Object Response

    time (sec)

    0.00673 0.00635 0.0046372 0.001254

    Page Response

    time Sec

    0.008763 0.002361 0.0126734 0.002732

    Traffic

    received( Bytes/sec

    )

    520.3428 420.0938 490.5673 409.4326

    Traffic

    Received( Packets/

    sec)

    0.67382 0.47262 0.590363 0.398723

    Traffic sent(Bytes

    /sec)

    Traffic

    sent(Packets/sec)

    520.3428

    0.673532

    420.0938

    0.467292

    490.5673

    0.62539

    409.4326

    0.438272

    Print:

    Parameter Scenario1 Scenario2 Scenario3 Scenario4

    Traffic

    received(Bytes/sec)

    375.4532 178.0392 367.9182 189.3723

    Traffic

    received( Packets/s

    ec)

    0.067362 0.023637 0.078367 0.037465

    Traffic

    sent( Bytes/sec)

    375.1429 178.0392 373.6473 189.3723

    Traffic

    sent(Packets/sec)

    0.067362 0.023637 0.078367 0.037465

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    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.

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    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

    http://www.opnet.com/https://cms1.gre.ac.uk/teachmat0809/COMP1266/course/schedule.asp?banner=COMP1266https://cms1.gre.ac.uk/teachmat0809/COMP1266/course/schedule.asp?banner=COMP1266http://www.opnet.com/https://cms1.gre.ac.uk/teachmat0809/COMP1266/course/schedule.asp?banner=COMP1266https://cms1.gre.ac.uk/teachmat0809/COMP1266/course/schedule.asp?banner=COMP1266