Simulation of OSPF Routing Protocol Using OPNET Module (A Routing Protocol Based on the Link-State Algorithm) Mehboob Nazim Shehzad (1085) Najam-Ul-Sahar (1253) firstname.lastname@example.org email@example.com Department of Computing and Technology Iqra University Islamabad Campus Course Code: Research Methods and Skill (HMT401) Submit To: Dr. Jamil Ahmad Supervisor: Sir Abdul Hannan Literature views: In  the author proposes OSPF routing protocol apply on the adaptive dynamic routing strategy in OPNET Modeler. In which author make the adaptive router network and link these router based on cast. Because in that network OSPF work on routers so that OSPF work based on cast. Link cast also change according to the effective bandwidth. Then the processor module also implemented at the routers of effective bandwidths and then traffic select the lowest cast to reach the destination path. In  the author proposes OSPF protocol under different scenarios and under states. In fact the main idea of the researcher is that to test the OSPF routing protocol in different scenarios. Firstly make the network and deploy the OSPF TE (Traffic Engineering) for check the traffic on the network. Then second one is to know router how much take the time for updates. Third one is to check the HELLO packet times. In which we get main idea is that in OSPF routing protocol how much take the time to update the router in case of any router connection fail. In 30 second router update to other then router take other way chose for send the packet. That network based on 292 nodes and 765 links. In  author proposes protect the network routing protocol and management protocols. Because insider attacks are probably one of the most challenging research problem in network management. In OSPF, a group of router make the network, these routers in that network exchange information and forward packet to each other. In this paper the researcher analyzes the OSPF and identifying the problems that create in that network during forwarding packets. Because if one router have a problem then whole network disturbed due to this one. So that researcher applies one attack to this OSPF network to analyze the performance of the OSPF routing protocol. That attack very powerful and block the router to update in 60 minutes by simple inter one wrong OSPF data unit. This work fully based on simulation and practice. In  author proposes OSPF routing protocol simulation in different categories. First one is Designated Router (DR) elect for constant time. In this case 50 routers can also accept the convergence time, and if any problem create then retransmission possible. Second one is if router has limited input buffers, then the compare the results between election and flooding protocols increase the election time. In that effect create oscillatory behavior. In fact that 20-50 router network has very low impact of buffer size. Third one is that in which DR and BDR are both fails in same time, then convergence time increase. If convergence time increase then the router cannot updated and data dropped in any condition. So that if interval increases then the convergence time decrease. In  author proposes the traffic engineering for adapting the routing of traffic to check the performance and be able to use of network recourses. In this article, researcher describes the intra domain traffic engineering that works base on the interior gateway protocol. Such as most useful interior gateway protocol is OSPF routing protocol. In this report researcher describe the OSPF configuration of links, based on a wide network view of traffic and topology with in a domain. The researcher also compares different optimization results and collects the data. Main idea of this research paper is also analyze the short path routing protocol are able to flow of traffic in large IP network. In  author describes the internet growth with the passage of time. Internet service Provider (ISPs) increase the traffic demand with new technology and also recourses that utilization. In a network packet also sent from source to destination with following protocol. The most commonly use Intra domain routing protocol is OSPF. In OSPF routing protocol every link have itself cast, but that cast set by a specific formula. The OSPF weight setting is also directly impact on network performance. So that main problem is that which algorithm is more suitable for this purpose. For this purpose researcher collect the results from different optimization scenarios for comparisons. Researcher also applies the linear programming for this purpose, but most commonly algorithm is used for this OSPF is Link State Algorithm. References:  Tatiana Brito, Lee Luan Ling., An OPNET Modeler Based Simulation Platform for Adaptive Routing Protocol. Brazil : FEEC,UNICAMP Campanies,S.P.  Anindya Basu, Jon G.Rieck., Stability Issues in OSPF Routing. Newyork : Bell Laboraties Aleri lnc.  Brain Vetter,Feiyi Wang,S.Felix Wu., An Experimental Study of Insider Attacks for the OSPF Routing Protocol. Carolina : secure and Highly Available networking Group,Dept.of Computer Science.North Carolina State University. 5-30183.  Deepinder Sidhu,Tayang Fu,Shukri Abdallah and Raj Nair., Open Shortest Path First (OSPF) Routing Protocol Simulation. Maryland : Rob Coltun. 20742 .  Bernard Fortz,Jennifer Rexford and Mikkel Thorup., "Traffic Engineering With Traditional IP Routing Protocols." IEEE Communications Magazine. October 2002, pp. 118-124.  M.Ericsson,M.G.C.Resend And P.M. Pardalos., A Generic Algorithm for the weight setting problem in OSPF Routing . Gainesville, USA. : s.n., October 9,2001.