高級(jí)計(jì)算機(jī)網(wǎng)絡(luò)實(shí)驗(yàn)報(bào)告-ns3模擬數(shù)據(jù)中心

1、精選優(yōu)質(zhì)文檔-傾情為你奉上Project1-ns3模擬數(shù)據(jù)中心實(shí)驗(yàn)要求根據(jù)上面的數(shù)據(jù)中心拓?fù)鋱D，完成以下要求：1. 根據(jù)給定的數(shù)據(jù)中心的拓?fù)浣Y(jié)構(gòu)，利用ns3進(jìn)行仿真2. 模擬兩種通信模式(traffic pattern)o all-to-all：每個(gè)服務(wù)器都發(fā)送消息給其他服務(wù)器消息，由拓?fù)浣Y(jié)構(gòu)可知，超過(guò)50%的消息傳送將跨越兩個(gè)簇(cluster)o many-to-one：每個(gè)服務(wù)器都發(fā)送消息給其中一個(gè)服務(wù)器3. 測(cè)量?jī)煞N模式下網(wǎng)絡(luò)的仿真可以達(dá)到的吞吐量，找出網(wǎng)絡(luò)瓶頸，并且說(shuō)明如何改進(jìn)注：拓?fù)渲械木W(wǎng)絡(luò)都是Ethernet網(wǎng)實(shí)驗(yàn)內(nèi)容數(shù)據(jù)中心模擬實(shí)現(xiàn)及主要代碼解釋a. 設(shè)置自定義的attribu

2、te為了做實(shí)驗(yàn)方便，設(shè)置如下自定義attribute：· pattern:通信模式，all-to-all或many-to-one，默認(rèn)為1· defaultDst:多對(duì)一模式下，接收消息的默認(rèn)服務(wù)器序號(hào)，默認(rèn)為0· verbose:enable或者disable PacketSink和OnOffApplication的日志，默認(rèn)為false· DataRate1:定義數(shù)據(jù)中心拓?fù)涞谝粚拥臄?shù)據(jù)傳輸速率(Mbps)，默認(rèn)為1.0· DataRate2:定義數(shù)據(jù)中心拓?fù)涞诙拥臄?shù)據(jù)傳輸速率(Mbps)，默認(rèn)為1.0· DataRate3:定

3、義數(shù)據(jù)中心拓?fù)涞谌龑拥臄?shù)據(jù)傳輸速率(Mbps)，默認(rèn)為1.5實(shí)現(xiàn)代碼如下： uint16_t pattern = 1; uint16_t nodesNum = 8; uint16_t defaultDst = 0; float DataRate1 = 1.0; float DataRate2 = 1.0; float DataRate3 = 1.5; uint16_t port = 50000; bool verbose = false; CommandLine cmd; cmd.AddValue("pattern", "number of traffic pat

4、tern", pattern);/pattern1:all-to-all pattern2:many-to-one cmd.AddValue("defaultDst", "default destination server node in pattern 2", defaultDst); cmd.AddValue("DataRate1", "data rate of csma network at level 1", DataRate1); cmd.AddValue("DataRate2&qu

5、ot;, "data rate of csma network at level 2", DataRate2); cmd.AddValue("DataRate3", "data rate of csma network at level 3", DataRate3); cmd.AddValue ("verbose", "Tell sink and onoff applications to log if true", verbose); cmd.Parse(argc, argv); LogCom

6、ponentEnable ("DataCenterSimulation", LOG_LEVEL_INFO); if (verbose) LogComponentEnable ("PacketSink", LOG_LEVEL_INFO); LogComponentEnable ("OnOffApplication", LOG_LEVEL_INFO); b. 創(chuàng)建結(jié)點(diǎn)根據(jù)實(shí)驗(yàn)要求，總共需要?jiǎng)?chuàng)建15個(gè)結(jié)點(diǎn)，包括:· 8 servers· 4 ToR switches· 2 Aggregation switche

7、s· 1 Core switch實(shí)現(xiàn)代碼如下： /create nodes NodeContainer n1_8; n1_8.Create(8); NodeContainer t1_4; t1_4.Create(4); NodeContainer a12; a12.Create(2); NodeContainer c1; c1.Create(1);c. 創(chuàng)建CSMA網(wǎng)絡(luò)節(jié)點(diǎn)整個(gè)數(shù)據(jù)中心網(wǎng)絡(luò)拓?fù)鋸南峦峡梢苑譃槿龑?，?#183; 第一層：由服務(wù)器與ToR組成的ethernet網(wǎng)絡(luò)，共有4個(gè)，編號(hào)為CSMA11,CSMA12,CSMA13,CSMA14· 第二層：由ToR與A

8、ggregation組成的ethernet網(wǎng)絡(luò)，共有2個(gè)，編號(hào)為CSMA21,CSMA22· 第三層：由Aggregation與Core組成的ethernet網(wǎng)絡(luò)，共有1個(gè)，編號(hào)為CSMA3將創(chuàng)建好的15個(gè)網(wǎng)絡(luò)結(jié)點(diǎn)分配到這7個(gè)CSMA網(wǎng)絡(luò)中，實(shí)現(xiàn)代碼如下： /create csma nodes NodeContainer csmaNodes11 = NodeContainer(n1_8.Get(0),n1_8.Get(1),t1_4.Get(0); NodeContainer csmaNodes12 = NodeContainer(n1_8.Get(2),n1_8.Get(3),t1

9、_4.Get(1); NodeContainer csmaNodes13 = NodeContainer(n1_8.Get(4),n1_8.Get(5),t1_4.Get(2); NodeContainer csmaNodes14 = NodeContainer(n1_8.Get(6),n1_8.Get(7),t1_4.Get(3); NodeContainer csmaNodes21 = NodeContainer(t1_4.Get(0),t1_4.Get(1),a12.Get(0); NodeContainer csmaNodes22 = NodeContainer(t1_4.Get(2)

10、,t1_4.Get(3),a12.Get(1); NodeContainer csmaNodes3 = NodeContainer(a12.Get(0),a12.Get(1),c1.Get(0);d. 設(shè)置CSMA網(wǎng)絡(luò)attribute，并將其安裝到相應(yīng)結(jié)點(diǎn)上根據(jù)實(shí)驗(yàn)要求中的網(wǎng)絡(luò)拓?fù)?，設(shè)置相應(yīng)網(wǎng)絡(luò)的屬性· 所有直接相連的兩個(gè)結(jié)點(diǎn)之間的延遲都為500ns· 第一層和第二層CSMA網(wǎng)絡(luò)的數(shù)據(jù)傳輸速率都為1.0Mbps，第三層為1.5Mbps然后安裝到相應(yīng)的網(wǎng)絡(luò)結(jié)點(diǎn)上，實(shí)現(xiàn)代碼如下（DataRate可以通過(guò)命令行參數(shù)設(shè)置，默認(rèn)值即為原實(shí)驗(yàn)要求）： /create the chan

11、nels first without any IP addressing information CsmaHelper csma1; sprintf(buf,"%1.1fMbps",DataRate1); csma1.SetChannelAttribute ("DataRate", StringValue (buf); csma1.SetChannelAttribute ("Delay", StringValue ("500ns"); NetDeviceContainer csmaDevices11 = csma1

12、.Install (csmaNodes11); NetDeviceContainer csmaDevices12 = csma1.Install (csmaNodes12); NetDeviceContainer csmaDevices13 = csma1.Install (csmaNodes13); NetDeviceContainer csmaDevices14 = csma1.Install (csmaNodes14); CsmaHelper csma2; sprintf(buf,"%1.1fMbps",DataRate2); csma2.SetChannelAttr

13、ibute ("DataRate", StringValue (buf); csma2.SetChannelAttribute ("Delay", StringValue ("500ns"); NetDeviceContainer csmaDevices21 = csma2.Install (csmaNodes21); NetDeviceContainer csmaDevices22 = csma2.Install (csmaNodes22); CsmaHelper csma3; sprintf(buf,"%1.1fMbps

14、",DataRate3); csma3.SetChannelAttribute ("DataRate", StringValue (buf); csma3.SetChannelAttribute ("Delay", StringValue ("500ns"); NetDeviceContainer csmaDevices3 = csma3.Install (csmaNodes3);e. 分配網(wǎng)絡(luò)IP根據(jù)實(shí)驗(yàn)要求，為每個(gè)結(jié)點(diǎn)安裝協(xié)議棧，并為7個(gè)CSMA網(wǎng)絡(luò)分配IP，實(shí)現(xiàn)代碼如下 /assign IP address NS_LO

15、G_INFO ("Assign IP address."); InternetStackHelper stack; stack.Install (n1_8); stack.Install (t1_4); stack.Install (a12); stack.Install (c1); Ipv4AddressHelper address; address.SetBase ("10.0.1.0", "255.255.255.0"); Ipv4InterfaceContainer csmaInterfaces11 = address.Ass

16、ign (csmaDevices11); address.SetBase ("10.0.2.0", "255.255.255.0"); Ipv4InterfaceContainer csmaInterfaces12 = address.Assign (csmaDevices12); address.SetBase ("10.0.3.0", "255.255.255.0"); Ipv4InterfaceContainer csmaInterfaces13 = address.Assign (csmaDevices13

17、); address.SetBase ("10.0.4.0", "255.255.255.0"); Ipv4InterfaceContainer csmaInterfaces14 = address.Assign (csmaDevices14); address.SetBase ("10.1.1.0", "255.255.255.0"); Ipv4InterfaceContainer csmaInterfaces21 = address.Assign (csmaDevices21); address.SetBase

18、 ("10.2.1.0", "255.255.255.0"); Ipv4InterfaceContainer csmaInterfaces22 = address.Assign (csmaDevices22); address.SetBase ("192.168.1.0", "255.255.255.0"); Ipv4InterfaceContainer csmaInterfaces3 = address.Assign (csmaDevices3);f. 初始化路由表這里直接調(diào)用了ns3自帶的路由實(shí)現(xiàn)，實(shí)現(xiàn)代碼如下

19、 / Create router nodes, initialize routing database and set up the routing / tables in the nodes. Ipv4GlobalRoutingHelper:PopulateRoutingTables ();g. 創(chuàng)建和分配PacketSink和OnOffClient首先，創(chuàng)建sink和OnOff，實(shí)現(xiàn)代碼如下 /Create sinkApp and OnOffClient ApplicationContainer clientAppnodesNum4; ApplicationContainer sinkAp

20、pnodesNum;然后，分配sink到所有的server結(jié)點(diǎn)上，實(shí)現(xiàn)代碼如下(其中nodesNum表示server個(gè)數(shù))： for(unsigned int i = 0;i < nodesNum; i+) PacketSinkHelper packetSinkHelper ("ns3:TcpSocketFactory", getAddress(i,port,csmaInterfaces11,csmaInterfaces12,csmaInterfaces13,csmaInterfaces14); sinkAppi = packetSinkHelper.Install

21、(n1_8.Get (i); sinkAppi.Start(Seconds (1.0); sinkAppi.Stop(Seconds (60.0); 再然后，分配OnOffClient到server結(jié)點(diǎn)上，并且根據(jù)pattern不同，進(jìn)行不同的配置· pattern 1：每個(gè)服務(wù)器都發(fā)送消息給其他服務(wù)器消息，即發(fā)送消息給在另一個(gè)簇上面的4個(gè)服務(wù)器（每個(gè)服務(wù)器上建立4個(gè)OnOffClient）· pattern 2：每個(gè)服務(wù)器都發(fā)送消息給同一個(gè)服務(wù)器，可以默認(rèn)為n1（每個(gè)服務(wù)器（n1除外）上建立1個(gè)OnOffClient）實(shí)現(xiàn)代碼如下 for(int i = 0; i <

22、; nodesNum; i+) uint16_t dst = 0; if(pattern=1)/all-to-all pattern for(int j = 0 ;j < 4; j+) if(i<=3) dst = j+4; else dst = j; OnOffHelper client("ns3:TcpSocketFactory",getAddress(dst,port,csmaInterfaces11,csmaInterfaces12,csmaInterfaces13,csmaInterfaces14); client.SetAttribute (&quo

23、t;OnTime", StringValue("ns3:ConstantRandomVariableConstant=50"); client.SetAttribute ("OffTime", StringValue("ns3:ConstantRandomVariableConstant=0"); client.SetAttribute ("DataRate", DataRateValue (DataRate ("1.0Mbps"); client.SetAttribute (&quo

24、t;PacketSize", UintegerValue (2000); clientAppij = client.Install (n1_8.Get (i); clientAppij.Start(Seconds (1.0); clientAppij.Stop (Seconds (51.0); sprintf(buf,"OnOffClient Node %d aims at Server Node %d",i+1,dst+1); NS_LOG_INFO (buf); else if(pattern=2)/many-to-one pattern if(i = def

25、aultDst)continue; dst = defaultDst; OnOffHelper client("ns3:TcpSocketFactory",getAddress(dst,port,csmaInterfaces11,csmaInterfaces12,csmaInterfaces13,csmaInterfaces14); client.SetAttribute ("OnTime", StringValue("ns3:ConstantRandomVariableConstant=50"); client.SetAttribu

26、te ("OffTime", StringValue("ns3:ConstantRandomVariableConstant=0"); client.SetAttribute ("DataRate", DataRateValue (DataRate ("1.0Mbps"); client.SetAttribute ("PacketSize", UintegerValue (2000); clientAppi0 = client.Install (n1_8.Get (i); clientAppi0

27、.Start(Seconds (1.0); clientAppi0.Stop (Seconds (51.0); sprintf(buf,"OnOffClient Node %d aims at Server Node %d",i+1,dst+1); NS_LOG_INFO (buf); 這里解釋一下一個(gè)函數(shù)· getAddress：根據(jù)server的標(biāo)號(hào)產(chǎn)生相應(yīng)的IP:port地址getAddress實(shí)現(xiàn)代碼如下InetSocketAddress getAddress(int i,uint16_t port,Ipv4InterfaceContainer i1,Ip

28、v4InterfaceContainer i2,Ipv4InterfaceContainer i3,Ipv4InterfaceContainer i4) switch(i) case 0: return InetSocketAddress(i1.GetAddress(0),port);break; case 1: return InetSocketAddress(i1.GetAddress(1),port);break; case 2: return InetSocketAddress(i2.GetAddress(0),port);break; case 3: return InetSocke

29、tAddress(i2.GetAddress(1),port);break; case 4: return InetSocketAddress(i3.GetAddress(0),port);break; case 5: return InetSocketAddress(i3.GetAddress(1),port);break; case 6: return InetSocketAddress(i4.GetAddress(0),port);break; case 7: return InetSocketAddress(i4.GetAddress(1),port);break; default:

30、return InetSocketAddress("10.0.0.1",port); h. 配置相應(yīng)的trace這里采用pcap文件來(lái)trace所有的device，方便利用wireshark來(lái)分析實(shí)驗(yàn)結(jié)果，實(shí)現(xiàn)代碼如下csma1.EnablePcapAll ("DataCenterSimulation");實(shí)驗(yàn)結(jié)果與分析a. pattern 1 實(shí)驗(yàn)結(jié)果執(zhí)行命令./waf -run "scratch/DC -pattern=1"（scratch/DC.cc為本次實(shí)驗(yàn)源程序文件），實(shí)驗(yàn)運(yùn)行結(jié)果如下所示從上面的結(jié)果可以看出，每個(gè)結(jié)點(diǎn)上的O

31、nOffClient都有一半以上跨越了兩個(gè)簇，產(chǎn)生的pcap文件如下所示為了分析patten 1的網(wǎng)絡(luò)吞吐量，根據(jù)all-to-all模式下網(wǎng)絡(luò)的對(duì)稱(chēng)性，選取測(cè)量位置· CSMA11：通過(guò)server n1(node 0/device 0)來(lái)估計(jì)· CSMA21：通過(guò)ToR t1(node 8/device 1)來(lái)估計(jì)· CSMA3 ：通過(guò)Aggregation a1(node 12/device 1)來(lái)估計(jì)選取的測(cè)量標(biāo)準(zhǔn)為吞吐量，具體方法是· 使用wireshark分析相應(yīng)的pcap文件中的tcp包· 使用statistics-&g

32、t;TCP Stream Graph->Throughput Graph來(lái)查看整個(gè)過(guò)程中該結(jié)點(diǎn)上的吞吐量變化情況· 使用statistics->Summary來(lái)查看當(dāng)前結(jié)點(diǎn)上網(wǎng)絡(luò)平均吞吐量，以此估計(jì)相應(yīng)CSMA網(wǎng)絡(luò)的吞吐量server n1上的測(cè)量結(jié)果如下Throughput GraphSummaryToR t1上的測(cè)量結(jié)果如下Throughput GraphSummaryAggregation a1上的測(cè)量結(jié)果如下Throughput GraphSummaryb. pattern 1 實(shí)驗(yàn)結(jié)果分析首先對(duì)實(shí)驗(yàn)結(jié)果進(jìn)行簡(jiǎn)單匯總網(wǎng)絡(luò)結(jié)點(diǎn)帶寬(Mbps)網(wǎng)絡(luò)平均吞吐量(Mbps

33、)CSMA11server n11.00.255CSMA21ToR t11.00.541CSMA3Aggregation a11.50.993從上面的結(jié)果可以看出· 第1層CSMA網(wǎng)絡(luò)平均吞吐量是0.255Mbps，帶寬利用率為25.5%；· 第2層CSMA網(wǎng)絡(luò)平均吞吐量是0.541Mbps，帶寬利用率為54.1%；· 第3層CSMA網(wǎng)絡(luò)平均吞吐量是0.993Mbps，帶寬利用率為66.2%。c. pattern 1 瓶頸及改進(jìn)· 瓶頸根據(jù)以上的實(shí)驗(yàn)結(jié)果可以看出來(lái)，從網(wǎng)絡(luò)的平均吞吐量來(lái)看：第3層CSMA>第2層CSMA>第1層CSMA2，從帶

34、寬利用率上看也是這樣，所以作為core switch連接兩個(gè)子網(wǎng)絡(luò)但帶寬過(guò)小的第三層網(wǎng)絡(luò)成了整個(gè)網(wǎng)絡(luò)的瓶頸。· 改進(jìn)可以加大第3層網(wǎng)絡(luò)的帶寬，防止數(shù)據(jù)流量過(guò)大出現(xiàn)擁塞的情況發(fā)生。因此最后確定的網(wǎng)絡(luò)帶寬如下所示：o CSMA11-14：1.0Mbpso CSMA21-22：1.0Mbpso CSMA3 ：2.0Mbps· 改進(jìn)結(jié)果執(zhí)行命令行./waf -run "scratch/DC -DataRate1=1.0 -DataRate2=1.0 -DataRate3=2.0"，以相同方式測(cè)量網(wǎng)絡(luò)，得到的結(jié)果如下：網(wǎng)絡(luò)結(jié)點(diǎn)帶寬(Mbps)網(wǎng)絡(luò)平均吞吐量(Mbp

35、s)CSMA11server n11.00.306CSMA21ToR t11.00.523CSMA3Aggregation a12.00.990從上面的結(jié)果可以看出加大第三層網(wǎng)絡(luò)的帶寬，確實(shí)提高了整個(gè)網(wǎng)絡(luò)的吞吐量，尤其是對(duì)最底層的server結(jié)點(diǎn)來(lái)說(shuō)。d. pattern 2 實(shí)驗(yàn)結(jié)果執(zhí)行命令./waf -run "scratch/DC -pattern=2"，實(shí)驗(yàn)運(yùn)行結(jié)果如下所示從上面的結(jié)果可以看出，8個(gè)OnOffClient都將數(shù)據(jù)傳輸?shù)絥1，產(chǎn)生的pcap文件如下所示為了分析patten 2的網(wǎng)絡(luò)吞吐量，根據(jù)網(wǎng)絡(luò)拓?fù)涞膶?duì)稱(chēng)性，選取測(cè)量位置· CSMA11：通

36、過(guò)server n1(node 0/device 0)來(lái)估計(jì)· CSMA12：通過(guò)server n3(node 2/device 0)來(lái)估計(jì)· CSMA13：通過(guò)server n5(node 4/device 0)來(lái)估計(jì)· CSMA21：通過(guò)ToR t1(node 8/device 1)來(lái)估計(jì)· CSMA22：通過(guò)ToR t3(node 10/device 1)來(lái)估計(jì)· CSMA3 ：通過(guò)Aggregation a1(node 12/device 1)來(lái)估計(jì)選取的測(cè)量標(biāo)準(zhǔn)為吞吐量，具體方法是· 使用wireshark分析相應(yīng)

37、的pcap文件中的tcp包· 使用statistics->TCP Stream Graph->Throughput Graph來(lái)查看整個(gè)過(guò)程中該結(jié)點(diǎn)上的吞吐量變化情況· 使用statistics->Summary來(lái)查看當(dāng)前結(jié)點(diǎn)上網(wǎng)絡(luò)平均吞吐量，以此估計(jì)相應(yīng)CSMA網(wǎng)絡(luò)的吞吐量server n1上的測(cè)量結(jié)果如下Throughput GraphSummaryserver n3上的測(cè)量結(jié)果如下Throughput GraphSummaryserver n5上的測(cè)量結(jié)果如下Throughput GraphSummaryToR t1上的測(cè)量結(jié)果如下Throughput GraphSummaryToR t3上的測(cè)量