帧中继上的OSPF

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1、帧中继是典型的NBMA（NonBroadcastMultipleAccess）网络，其拓扑结构通常有两种：FullMesh(全互联)和Hub-and-Spoke（中心－分支）Hub-and-Spoke结构具有节约费用、简化配置等优点，在实际网络工程中有着广泛的应用。实验1:帧中继环境下NBMA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（2）NBMA模式下的DR选举（3）手工配置OSPF邻居（4）NBMA模式下OSPF的配置和调试2.拓扑结构3.实验配置R0三层交换机模拟帧中继交换机配置frame-relayswitching//把该路由器当成帧

2、中继交换机interfaceSerial1/1noipaddressencapsulationframe-relayserialrestart-delay0clockrate128000//该接口为DCE，要配置时钟noframe-relayinverse-arpframe-relaylmi-typeciscoframe-relayintf-typedceframe-relayroute102interfaceSerial1/2201frame-relayroute103interfaceSerial1/3301//“encapsulationframe-relay[ietf]”命令用来

3、配置口封装成帧中继，如果不加ietf参数，帧类型为cisco；如果加ietf参数，则帧类型为ietf。interfaceSerial1/2noipaddressencapsulationframe-relayserialrestart-delay0clockrate128000noframe-relayinverse-arpframe-relaylmi-typeciscoframe-relayintf-typedceframe-relayroute201interfaceSerial1/1102interfaceSerial1/3noipaddressencapsulationframe

4、-relayserialrestart-delay0clockrate128000frame-relaylmi-typeciscoframe-relayintf-typedceframe-relayroute301interfaceSerial1/1103R1interfaceLoopback0ipaddress1.1.1.1255.255.255.0ipospfnetworkpoint-to-point!interfaceSerial1/1ipaddress123.1.1.1255.255.255.0encapsulationframe-relayserialrestart-delay

5、0frame-relaymapip123.1.1.3103broadcast//帧中继静态映射frame-relaymapip123.1.1.2102broadcastnoframe-relayinverse-arp//关闭帧中继动态ARP解析ipospfnetworknon-broadcast（默认）frame-relaylmi-typecisco!routerospf1log-adjacency-changesnetwork1.1.1.00.0.0.255area0network123.1.1.00.0.0.255area0neighbor123.1.1.3neighbor123.1

6、.1.2!R2interfaceLoopback0ipaddress2.2.2.2255.255.255.0ipospfnetworkpoint-to-point!interfaceSerial1/2ipaddress123.1.1.2255.255.255.0encapsulationframe-relayipospfpriority0//配置spoke端OSPF接口优先级为0ipospfnetworknon-broadcast（默认）serialrestart-delay0frame-relaymapip123.1.1.3201broadcastframe-relaymapip123

7、.1.1.1201broadcastframe-relaymapip123.1.1.2201noframe-relayinverse-arpframe-relaylmi-typecisco!!routerospf1log-adjacency-changesnetwork2.2.2.00.0.0.255area0network123.1.1.00.0.0.255area0R3interfaceLoopback0ipaddress3.3