复旦大学：《计算机网络 Computer Networking》课程教学资源（PPT课件讲稿）Network Management

Network Management Chapter 10 Revised January 2007 Panko’s Business Data Networks and Te/ecommunications. 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book

Chapter 10 Revised January 2007 Panko’s Business Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book Network Management

Network Simulation Software

Network Simulation Software

I Figure 10-1: Network Simulation Simulation Build a model, study its implications More economical to simulate network alternatives than to build several networks and see which one is best Purposes Compare alternatives to select the best one Sensitivity analysis to see what will happen if the values of variables were varied over a range Anticipating bottlenecks because procurement cycles are long in business, so problems must be anticipated well ahead of time

3 Figure 10-1: Network Simulation • Simulation – Build a model, study its implications – More economical to simulate network alternatives than to build several networks and see which one is best • Purposes – Compare alternatives to select the best one – Sensitivity analysis to see what will happen if the values of variables were varied over a range – Anticipating bottlenecks because procurement cycles are long in business, so problems must be anticipated well ahead of time

I Figure 10-1: Network Simulation What Is: the existing situation R7 Net 4 Utilization in Peak hour 95% n Net 2) Too high!(Net 5 What Is analysis: Describe the current situation Is too high (95%); this wllour Problem: Utilization in the peak ho Net 6 create many momentary overloads

4 Figure 10-1: Network Simulation • What Is: the existing situation Net 1 Net 2 Net 3 Net 4 Net 5 Net 6 Utilization in Peak Hour 95% Too high! R7 What Is analysis: Describe the current situation. Problem: Utilization in the peak hour Is too high (95%); this will create many momentary overloads

I Figure 10-1: Network Simulation What-If: See the Impact of a change R7 Net Net 4 Est Added Utilization in Router Added Peak hour Link 70% Net 2 Net 5 What If analysis What will happen if something is done? Adding a new link between r3 and Net5 Net 6 will give good peak hour utilization

5 Figure 10-1: Network Simulation • What-If: See the Impact of a Change Net 1 Net 2 Net 3 Net 4 Net 5 Net 6 Est. Utilization in Peak Hour 70% Added Router Added Link What If analysis: What will happen if something is done? Adding a new link between R3 and Net5 will give good peak hour utilization. R3 R7

I Figure 10-1: Network Simulation The simulation Process: Step 1: Before the Simulation, Collect Data Data must be good Otherwise, GiGo(garbage in, garbage out Collect data on the current network Forecast growth

6 Figure 10-1: Network Simulation • The Simulation Process: Step 1: Before the Simulation, Collect Data – Data must be good – Otherwise, GIGO (garbage in, garbage out) – Collect data on the current network – Forecast growth

+Project: First Scenario: Main [Subnet: top Offi. ox Eile Edit yiew Scenarios Topology Traffic Protocols Simulation Results Figure 10-2: OPNET T Guru 125 Node Template Work area Dragged Icon The process Object Palatte: (ethernet_ advanced) ethemet advanced Configure Palette Add node icons to the ethermet16_layer 4_switch_ ad ethetnet16_layer4_switch_int ethenet16_switch_adv simulation work area ethernet255 hub ady (clients, servers, ethernet2 bridge adv ethemet2 bridge int ethernet]6 swtch inl switches, routers, etc. Object Palette ethetnet32 hub ad ethernet bridge adv Drag from the Object Palette ethernet4 switch ady ethenel4 switch int Defining new obiect [ethernet32 hub adv]

7 Figure 10-2: OPNET IT Guru Node Template Dragged Icon The Process: 2. Add node icons to the simulation Work Area (clients, servers, switches, routers, etc.) Drag from the Object Palette Object Palette Work Area

Figure 10-4: Configured Simulation Model Specify the topology by adding transmission lines between nodes(and specifying line speeds Click on two nodes click on a transmission line icon in the object palette

8 Figure 10-4: Configured Simulation Model 3. Specify the topology by adding transmission lines between nodes (and specifying line speeds). Click on two nodes, click on a transmission line icon in the object palette

Figure 10-3: Configuring a Frame Relay CIR H(contract Parameters)Table 口x Athibutc Ougcirg CIR (te/sec) 128C0 OulyLir y bu lilaI 640C0 Ougcirg Be lbit 40 Iniuui ir u CR (i\/secI Sallt Incoming Bc lbt] Sam∈ Iniuui ir y be lil:l Sdlt 4 Configure EACH node and transmission lines(P Time-to-Live value, etc. 0< In this case, Frame Relay burst speed rate

9 Figure 10-3: Configuring a Frame Relay CIR 4. Configure EACH node and transmission lines (IP Time-to-Live value, etc.). In this case, Frame Relay burst speed rate

Figure 10-4: Configured Simulation Model 5 Add applications, which generate traffic data Applications ,,中n 群把品 10

10 Figure 10-4: Configured Simulation Model 5. Add applications, which generate traffic data Applications