Network Simulation With OPNET Modeler

Network Simulation With OPNET ModelerM.KAMRAN USMANIABSTRACTR bring outing communications communications communications protocol is the disclose for the quality of modern communication network. EIGRP, OSPF and origin argon the dynamic routing protocols existence put ond in the practical networks to propagate network topology entropy to the neighboring routers. There squander been a large fig of silent and dynamic routing protocols available but choice of the right protocol for routing is impression-level on many parameters critical being network crossway clock, scalability, wargonho exploitation and CPU requirements, security and bandwidth requirement etc.This Assignment exercises OPNET simulation instrument to analyze the performance of perpetrate and EIGRP comm exclusively used in IP network.Initially We have Fol deplorableing Network.By Examining the Network we figure out that Red line indicating the entropy Rate of 44.736 Mbps amidst network components and onl y Network connection between capital of the United Kingdom place and Portsmouth obligation has Data Rate of 64 Kbps.The avocation run away between capital of the United Kingdom blot and Bristol_corporate is IP_Traffic Flow having pursuit chracteristics stemma communications protocol Over NetwrokRouting Information protocol ( root for) is a place transmitter dynamic routing protocol that employs the hop tally as a routing metric. RIP is implemented on top of the substance abuser Datagram Protocol (UDP) as its transport protocol. It is assigned the reserved port form 520. RIP prevents routing loops by implementing a limit on the number of hops allowed in a route from the source to a destination. The maximum number of permitted hops is 15. Hence a hop count of 16 is considered an sempiternal distance. This hop number limits the size of networks that RIP may support. RIP selects directions that have the smallest hop counts. However, the channel may be the slowest in the network. RIP is simple and efficient in small networks.First we have to assort RIP routing protocol in the network for a simulation cessation of 600 seconds with selecting following criteriaPath SelectionTime taken for routing crosswayProtocol smashPath SelectionFor path selection we get following result with RIP protocolThe IP job Flow is from capital of the United Kingdom to Bristol Corporate and due to Low Data rate between capital of the United Kingdom to Portsmouth path as comp be to capital of the United Kingdom to Oxford path the RIP protocol follows maximum the low Data rate path which is London Office to Portsmouth, and graphical record displays data throughput for the consociates London to Portsmouth and Portsmouth to Bristol.Time Taken for routing productRIP is distance vector routing protocols, announces its routes in an unsynchronized and unac chouseledged manner. This abide lead to convergence puzzles. The graph is showing the time taken for routing converge nce of RIP. The convergence time is high 6.975 sec thats mean routers are finding it difficult to exchange state information.Protocol OverheadRIP is a distance vector based protocol selects the best routing path based on a distance metric(the distance) and an interface (the vector) , RIP protocols evaluate the best path based ondistance, which can be measured in impairment of hops or a faction of prosody calculated to represent a distance foster. In this bore RIP selects London to Portsmouth attach and maximum utilization occurs .The economic consumption and convergence data suggests there is some queuing and blocking on the link. For example, the custom for the London to Portsmouth link is high i.e 84.629 therefore suggesting the link is suffering from over-utilisation.Queuing/DelayIn the point to point queuing graph , the London to Portsmouth Link contains queuing delay on average 3.6032 sec , therefore suggesting there is traffic blocking or queuing on the link.The link be tween London to Portsmouth uses a DS0 (Blue) cable with a data rate of 64Kbps compared to the other links in the network that use a DS3 cable (Red) with a data rate of 44.736Mbps therefore the combining of the over-utilisation of the London to Portsmouth link with the low data rate cable (DS0) has caused traffic queuing or blocking to occur.-Excersise -2 -EIGRP Protocol Over NetwrokEnhanced Interior opening Routing Protocol (EIGRP) is a Cisco proprietary routing protocol. It is based on a new route calculation algorithm called the Diff victimisation Update algorithm (DUAL). It has features of both distance vector and link state protocols. EIGRP metrics are based on reliability, MTU, delay, load, and bandwidth. Delay and bandwidth are thebasic parameters for calculating metricsFirst we have to run EIGRP routing protocol in the network for a simulation period of 600 seconds with selecting following criteriaPath SelectionTime Taken for routing convergenceProtocol OverheadPath Selecti onFor path selection we get following result with EIGRP protocolThe IP traffic Flow is from London to Bristol Corporate but as contrast with RIP which selected low data rate path, EIGRP select the path from London to Oxford , Oxford to Birmingham , and Birmingham to Bristol path to carry out the traffic Flow.Time Taken for routing convergenceEIGRP is more efficient as compared to RIP , Graphs are showing the convergence duration very profuse 0.0074427 Sec as Compared to RIP which was 6.975 Sec with same scenario.Protocol OverheadAs Compared to RIP , No over utilisation occurs in EIGRP , use graphs shown above clearly that the utilisation distributed evenly over path with value for the London to Oxford is 5.5606 , Oxford to Birmingham is 5.5783 and Birmingham to Bristol is 5.5662EIGRP performs better in terms of network convergence, routing traffic, and Ethernet delay.EIGRP has the characteristics of both distance vector and link state protocols, has improved network convergence, reduced routing protocol traffic, and little CPU and RAM utilization compared to RIP protocol.EIGRP has very low usage of network resources during normal operation since only hello packets are transmitted. When a routing hold over changes, its convergence time is short and it reduces bandwidth utilization-Excersise -3 - sorrow SCENARIOWe introduced a link Failure Scenario between Bristol corporate and Porstmouth Office afterward 100 Seconds and its recovery at 200 Seconds and run the RIP and EIGRP protocol over network. spare-time activity are our Observations with side by side proportion of RIP and EIGRPUtilizationIn the RIP protocol the link misfortune after 100 sec prevented the traffic to flow therefore when the link recovered after 200 sec a huge total of traffic was bottlenecked on the link causing the utilisation of the London to Portsmouth to all of a sudden increase. Also it can be observed that during the time of the failure the RIP protocol began to reroute the tra ffic over the London to Oxford, Oxford to Birmingham, and Birmingham to Bristol links before the link recovered the graph is showing this small utilization on the links.In the EIGRP Protocol, link failure event did non affect the utilisation of the EIGRP protocol because the link was not used in the routing path The EIGRP did not use the link Portsmouth to Bristol in its path selection, so the performance of the network get out be barely affected by the failure hence the utilisation values doesnt change productIn RIP The Convergence Duration becomes much(prenominal) higher as compare to old scenario before Failure , it was 6.975 before and 19.409 now , this is because routers updates their routing tables when failure occurred and recovered it takes more time period ,In Contrast with EIGRP protocol the Convergence Duration becomes 0.012273 , much less than RIP this is because EIGRP only update the link failure routing table not the whole network , So EIGRP provides much efficien t and windy way to achieve convergence.Time Delay of ProtocolMore IP packets drops in RIP as compared to EIGRP because of the failure in link of the path which RIP follows , and as contrast less IP packets drops in EIGRP because it does not follow the path of failure link.-Excersise -4 -Consider the given Network encounter with another network, Picture shown below the merging NetworkThe IP Traffic flows sending traffic from London Office to three destination North-wales plant life, Birmingham Plant and Oxford Office. We defined IP Traffic according to given table.A sassy Link DS_1 ( Black Line in Picture ) introduced which connects North-wales Plant to London Office via The New Manchester Office.We runs RIP as routing Protocol which gives us Following observationsUtilizationFrom Graph it is clearly showing that utilisation is high for London office to Manchester office and Manchester Office to North WalesBoth are nigh 97 % utilisation which is overutilization and cause serious problems to the network.For London to oxford office and Oxford to Birmingham Plant the utilisation is nearly 13% and 6% this is because of link using high data rate cable DS3 where we get the low utilisation and low data rate comparatively where we get lower data rate cable.DS1 cable has data rate of 1.5Mbps which DS3 has 44.736 MbpsWith this Observation , we come to know that one possible solution is using EIGRP protocol , as EIGRP protocol solve the over utilisation problem from our network.Lets see by run the EIGRP protocols and compare the result of it with RIPThe EIGRP protocol solves the Over utilization problem we have faced in RIP protocol and the resultant graph and comparison is showing this clearly with evenly distributed utilization over selected path by EIGRP.CONCLUSIONS It can be seen that EIGRP compared to RIP performs better in terms of network convergence activity and Routing protocol traffic. EIGRP has the characteristics of both distance vector and link state pr otocols, has improved network convergence, reduced routing protocol traffic, and less CPU and RAM utilization compared to RIPReferencesPerformance Analysis of RIP, EIGRP, and OSPF using OPNET By Don Xu and Ljiljana TrajkoviDynamic Routing Protocol Implementation Decision between EIGRP, OSPF and RIP Based on Technical Background Using OPNET modeller By Thornier, S.G.