教案成果03hcie rs和参考新版201943pim dm

1、PIM-DM协议原理前言组播路由器之间运行组播路由协议，组播路由协议用于建立和 维护组播路由，并正确、高效地转发组播数据包。PIM（Protocol Independent Multicast）是典型的域内组播路由协议，分为DM（Dense Mode）和SM（Sparse Mode）两种模型。Page1培训目标学完本课程后，您应该能： l理解PIM-DM协议基本原理l理解PIM-DM协议工作机制l掌握PIM-DM的基本配置Page2目录PIM-DM概述与配置PIM-DM协议机制PIM-DM配置验证Page3PIM-DM概述IGMP接收者PC1PIM-DM接收者SourceIGMPPC2Page

2、4PIM-DM中数据包的转发IGMP接收者PC1PIM-DM接收者SourceIGMPPC2Page5PIMv2报文头格式071531版本l版本字段标识版本类型l0：Hellol3：加入/剪枝l5：Assertl6：嫁接l7：嫁接回应l9：状态刷新2Page6版本类型保留校验和PIM-DM基本配置RTBRTCIGMPS0/0PC1S1/0PIM-DMS0/1RTDRTERTASourceIGMPPC2RTAmulticast routing-enable RTAinterface Serial0/0 RTA-Serial0/0pim dm RTAinterface Serial0/1 RTA-

3、Serial0/1pim dm RTAinterface Serial1/0 RTA-Serial1/0pim dmPage7目录PIM-DM概述与配置PIM-DM协议机制PIM-DM配置验证Page8邻居发现Hello报文RTBRTCHelloPIM-DMPIM-DMHelloRTBRTCHelloHello优先级高的或者IP地址大的成为DRIGMPv1PC1Page9构建SPT树扩散组播源网络中的每个路由器都会创建(S, G)表项组播报文接收者Page10构建SPT树剪枝组播源下游节点没有组播成员， 则向上游节点发剪枝消息组播报文剪枝消息接收者Page11SPT树的形成组播报文组播源网络中

4、的每个路由器仍然会保留(S, G)表项注意：扩散剪枝周期性进行！ 每3分钟重复一次。接收者Page12嫁接机制新的接收者组播源组播报文Graft嫁接消息接收者Page13新的SPT树接收者组播源组播报文接收者Page14RPF检查源151.10.3.21组播报文Page15Assert机制Router ARouter BRouter CEthernetSPTRouter DReceiverAssertPage16PIM-DM协议机制PIM-DM的工作过程可以概括为：l邻居发现l扩散l剪枝l嫁接lAssert机制Page17目录PIM-DM概述与配置PIM-DM协议机制PIM-DM配置验证Pag

5、e18查看PIM-DM组播路由表RTBE0/1E0/0PC1E0/0IGMPE1/0PIM-DME1/0RTCE0/0RTERTASourceE0/1PC2RTCdisplay pim routing-table-Instance: public netT tal 0 (*, G) entry; 1 (S, G) entry (192.168.1.2, 224.1.1.1)Protocol 0x40: pim-dm, Flag 0x4: Uptime: 00:05:54, Timeout in 204 Upstream interface: Ethernet0/0, Downstream in

6、terface list:MP NBR, never timeout Matched 1 (S,G) entrySPTsecRPF neighbor:10.2.2.1Page19查看PIM邻居RTBE0/0E0/1E0/0PC1IGMPE1/0PIM-DME1/0RTCE0/0RTERTASourceE0/1PC2<RTC>display pim neighborNeighbor's 10.2.2.1172.16.1.1AddressInterface Name Ethernet0/0 Ethernet0/1Uptime 00:17:1500:17:11Expires 00

7、:01:3400:01:39Page20查看PIM接口配置RTCdisplay pim interface verbosePIM information of interface Ethernet0/0: IP address of the interface is 10.2.2.2PIM PIM PIM PIM PIM PIMis enabled version is 2 mode is Densequery interval is 30 seconds neighbor limit is 128 neighbor policy is noneTotal 1 PIR(designated router) is 10.2.2.2PIM information of interface Ethernet0/1:IP address of the interface is 172.16.1.3PIM PIM PIM PIM PIMis enabled version is 2 mode is Densequery interval is 30 seconds neighbor limit is 1eTotal 1 PIM neighbor o