Network Performance Optimization FIT ion

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Network Performance Optimization:

A Case Study of Enterprise Network

Simulate in OPNET

Munam Ali Shah*, Ghazanfar Ali Safdar*Carsten Maple*, Khurram Sardar

munam.shah, ghazanfar.safdar,[email protected]*

[email protected]~

*University of Bedfordshire, UK.

~COMSATS Institute of Information Technology IslamabadPakistan.

December 2011


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Outline

Introduction

Investigation of the Existing Network

Simulation and Statistics of the Existing Network Identification of Problems in the current Network

Proposed Network

Comparison of Results

Conclusion


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Introduction Considered Enterprise Network of COMSATS (CIIT).

Comprised of approx. 1200 wired and wireless nodes

5 buildings, 14 computer labs, library and faculty offices

Provide local services such as ftp, email, SIS, DNS, etc

Provide internet servicessuch as web browsing

video conferencing,

web mail etc.

CIIT Block Diagram


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Investigation of the Network

CIIT Network Diagram


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Simulation of the Existing Network

To analyse the performance of existing

network, we simulated the complete network

in OPNET Modeler.

We obtained the global statistics for

EthernetDelay

WLAN MAC Delay

WLAN load

Routing Protocol Traffic

Traffic forwarded by a Switch


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Statistics of the Existing Network

Ethernet Delay

Average Delay of CIIT Ethernet Network

WLAN MAC Delay

Average Delay of CIIT Ethernet Network


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Statistics of the Existing Network

RIP Traffic

RIP Traffic Received and Sent

Switch Traffic

Switch Traffic Forwarded


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Problems in the Current Network

Cascading of Network Devices

Wrong choice of Routing Protocol

No user access policies Manual load balancing

No firewall configuration

Traffic bottle neck due to network interfacecapacity

Low bandwidth


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Proposed Network

We have been successful in addressing the problems

in existing network

Specially we remove the cascading in the network by

providing direct Ethernet connectivity to all floorsand reconfiguring the routing protocol.

EIGRP Network Direct Ethernet Connectivity


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Comparison of Results

Ethernet Delay (Existing N/W) Ethernet Delay (Proposed N/W)

Ethernet Delay (sec) Ethernet Delay (sec)


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Comparison of Results (cont..)

WLAN MAC Delay (Existing N/W) WLAN MAC Delay (Proposed N/W)

WLAN MAC Delay (sec) WLAN MAC Delay (sec)


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WLAN Load (Existing N/W) WLAN Load (Proposed N/W)

WLAN Load (sec) WLAN Load (sec)


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Routing Protocol Traffic (Existing N/W) Routing Protocol Traffic (Proposed N/W)

Rip Traffic Received and Sent(bits/sec) EIGRP Traffic Received and Sent(bits/sec)


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Switch Traffic Forwarded (Existing N/W) Switch Traffic Forwarded (Proposed N/W)

Switch0 traffic forwarded (bits/sec) Switch0 traffic forwarded (bits/sec)


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Conclusion

We have thoroughly investigated the network whichdemands sound knowledge of enterprise network.

We simulated and configured different network devicesand routing protocols which need skills and expertise.

We used OPNET Modeler which is one of the best DESbut complex and difficult to use.

We compared the results of both the approaches aftersimulating the existing and proposed scenarios.

We believe that if network is modified accordingly,performance can be optimized significantly (summarizedin table 1).


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Conclusion (cont..)

Parameter Existing Network

(avg.)

Proposed

Network

(avg.)

Performance

Optimization

(Approx.)

Ethernet Delay 0.00053sec .00039sec 26%

WLAN MediaAccess Delay

0.060sec 0.290sec 51%

WLAN Throughput

195000bits/sec 26500bits/sec 27%

WLAN Load


Traffic forwarded bySwitch0


Table 1: Network Performance Optimization Summary


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References[1] COMSATS Institute of IT home page, 2011 URL: http://www.ciit.edu.pk[2] L. Jing The practice and defense of LAN monitor, IEEE International Forum on Information Technology and Applications. 2010, vol. 1,

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[18] Application and Network Performance with OPNET Home page. URL : http://www.OPNET.com


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Network Performance Optimization FIT ion

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