实验2：帧中继环境下BMA模式

17.2实验2：帧中继环境下BMA模式1.实验目的通过本实验可以掌握：①帧中继静态映射及Broadcast参数的含义BMA模式下的DR选举；BMA模式OSPF的配置和调试2．拓扑结构实验拓扑图如图17-1所示。104401■00:3.3.3.3=24L00:4,4,4.42+Lo0:1.1.1.124Aiea0104401■00:3.3.3.3=24L00:4,4,4.42+Lo0:1.1.1.124Aiea0safari/3£9/盹JT103/图17-1帧中继环境下NBMA模式3．实验步骤(1)步骤1：配置路由器R1R1(config)#interfaceloopbackeOR1(config-if)#ipaddress1.1.1.1255.255.255.0R1(config-if)#ipospfnetworkpoint-to-pointR1(config-if)#interfaceSerial0/0/0R1(config-if)#ipaddress134.1.1.1255.255.255.0R1(config-if)#encapsulationframe-relayR1(config-if)#frame-relaymapip134.1.1.3103broadcastR1(config-if)#frame-relaymapip134.1.1.4104broadcastR1(config-if)#frame-relaymapip134.1.1.1103R1(config-if)#noframe-relayinverse-arpRl(config-if)#ipospfnetworkbroadcastRl(config-if)#noshutdownR1(config)#routerospf1R1(config-router)#router-id1.1.1.1R1(config-router)#network1.1.1.00.0.0.255area0R1(config-router)#network134.1.1.00.0.0.255area0⑵步骤2：配置路由器R3R3(config)#interfaceloopbacke0R3(config-if)#ipaddress3.3.3.3255.255.255.0R3(config-if)#ipospfnetworkpoint-to-pointR3(config-if)#interfaceSerial0/0/1R3(config-if)#ipaddress134.1.1.3255.255.255.0R3(config-if)#encapsulationframe-relayR3(config-if)#ipospfpriority0R3(config-if)#frame-relaymapip134.1.1.1301broadcastR3(config-if)#frame-relaymapip134.1.1.4301broadcastR3(config-if)#frame-relaymapip134.1.1.3301R3(config-if)#noframe-relayinverse-arpR3(config-if)#ipospfnetworkbroadcastR3(config-if)#noshutdownR3(config)#routerospf1R3(config-router)#router-id3.3.3.3R3(config-router)#network3.3.3.00.0.0.255area0R3(config-router)#network134.1.1.00.0.0.255area0⑶步骤3：配置路由器R4R4(config)#interfaceloopbacke0R4(config-if)#ipaddress4.4.4.4255.255.255.0R4(config-if)#ipospfnetworkpoint-to-pointR4(config-if)#interfaceSerial0/0/1R4(config-if)#ipaddress134.1.1.4255.255.255.0R4(config-if)#encapsulationframe-relayR4(config-if)#ipospfpriority0R4(config-if)#frame-relaymapip134.1.1.1401broadcastR4(config-if)#frame-relaymapip134.1.1.4401broadcastR4(config-if)#frame-relaymapip134.1.1.3401R4(config-if)#noframe-relayinverse-arpR4(config-if)#ipospfnetworkbroadcastR4(config-if)#noshutdownR4(config)#routerospf1R4(config-router)#router-id444.4R4(config-router)#network4.4.4.00.0.0.255area0R4(config-router)#network134.1.1.00.0.0.255area0【技术要点】在hub-and-Spoke结构中，BMA也要控制DR选举，确保处于”Hub”端的路由器为DR,实施方法和实验1一样；BMA模式下，邻居关系自动通过Hello包建立和维持。4.实验调整showipospfinterfaceR1#showipospfinterfaces0/0/0Serial0/0/0isup，lineprotocolisupInetrnetAddress134.1.1.1/24，Area0ProcessID1，RouterID1.1.1.1NetworkTypeBROADST，Cost;64 〃网络类型为BROADCASTTransmitDelayis1sec， StateDR，Priority1DesignatedRouter(ID)1.1.1.1，Interfaceaddress134.1.1.1NobackupdesignatedrouteronthisnetworkTimerintervalsconfigured,Hello10，Dead40，Wait40,Retransmit5 //BMA模式下，Hello周期为10soob-resynctimeout40Helloduein00;00;07Index2/2，floodqueuelength0Next0x0(0)/0x0(0)Lastfloodscanlengthis1， maximumis1Lastfloodscantimeis0msec，maximuumis4msecNeighborCountis2，Adjacentneighborcountis2Adjacentwiethneighbor3.3.3.3Adjacentwiethneighbor4.4.4.4Suppresshellofor0neighbor(s)showiprouteR4#showiprouteos