² 交换机的默认行为是把多播帧向除源端口之外的所有端口扩散。Cisco执行专有的CGMP和非专有的IGMP Snooping，来协助管理网络中的多播流量。 交换机洪泛多播流量的原因是在桥接表中没有目的地址的表项。多播地址从不作为源地址出现。 ² 默认情况下路由器不转发多播流量，除非它们具有多播能力，并有一个多播路由选择协议，例如DVMRP（Distance Vector multicast Routing Protocol）或PIM(Proto...

multicast: 1.PIM-DM,DR elected: PIM-DM Designated Router select by hello package,which router with the highest ip address. others:can uses DR-Priority option to elected as the DR.(default priority=1);that the router with highest ip address will be elected as DR. elected base ip address is PIMv1. DR-Priority only support for PIMv2. 2.PIM-DM source Distribution tree. SPTs are built on the fly,using...

概念：组播 (multicast) ------------------------------------------ 与 unicast, broadcast 类似，它是数据的一种传送方式。 与 unicast 相比较，在发送相同数据到多个目标时，unicast 对不同目标分别发送一份数据，即每个目标均要发送一次，而 multicast 只发送一份数据但所有目标将都会得到一份，即多目标只发送一次。 这里要注意，multicast 与 broadcast 是有区别的，broadcast 通常只能在同一广播域传递，路由器是分割广播...

是对multicast的总结... Created by Cappuccino on January 21, 2005 【多播地址】 l Link-local addresses: 224.0.0.0 ~ 224.0.0.255 由一些网络协议在本网段使用，路由器不转发这些报文。 l Administratively scoped addresses: 239.0.0.0 ~ 239.255.255.255 用于私有的多播域中，类似于私有IP地址 l Globally scoped addresses: 224.0.1.0 ~ 238.255.255.255 可供任何实...

Layer 2 multicast Addresses Normally, network interface cards (NICs) on a LAN segment will receive only packets destined for their burned-in MAC address or the broadcast MAC address. Some means had to be devised so that multiple hosts could receive the same packet and still be capable of differentiating among multicast groups. Fortunately, the IEEE LAN specifications made provisi...

文件: multicast.rar 大小: 1791KB 下载: 下载 本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/27493/showart_388820.html

#include #include #include #include #include #include void mcast_join(int sockfd) { struct ip_mreq req; req.imr_interface.s_addr=INADDR_ANY; inet_aton("224.2.2.2",&req.imr_multiaddr); setsockopt(sockfd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&req,sizeof(req)); } char *sock_ntop(const struct sockad...

Challenge and techniques in Overlay multicast design Challenge Techniques Forwarding Path Construction Tree Construction Algorithms Group Dynamics Performance-aware Adaptation/ Multiple Trees Supply Bandwidth Rate Adaptation / Multiple Trees Receiver Scalability Rate Adaptation / Mul...

Figure 71 illustrates how a helper address on two routers converts from broadcast to multicast and back to broadcast. Figure 71 IP multicast Helper Scenario The configuration on the first hop router converts a broadcast stream arriving at incoming Ethernet interface 0 destined for UDP port 4000 to a multicast stream. The access list denies other traffic from being forwarded into the multicast...

什么是multicast pings？怎么知道我的solaris9系统上是否支持multicast pings? thanks