By William R. Parkhurst
Sizzling booklet on a sizzling technology--Cisco's new new release of routers is designed to deal with IP Multicasting, the most important to video conferencing and groupware. step by step assistance on the best way to set up and troubleshoot multicasting in a Cisco Router surroundings. entire insurance of present and destiny intranet multicast routing protocols, interoperability framework, web crew administration protocol, and extra. From the revered writer of McGraw-Hill's Cisco Router OSPF layout and Configuration consultant.
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Extra resources for Cisco Multicast Routing And Switching
154, so the multicast traffic will be forwarded to subnet 2. What if host D in Figure 3-1 joins the group? The router only needs to know that at least one group member is on the subnet and it does not matter to the router if there is one group member or if there are 100. Figure 3-2 shows the scenario where subnet 1 has no group members, but a downstream multicast router on subnet 1 has group members attached to one of the router's interfaces. The multicast traffic would need to be forwarded onto subnet 1.
Figure 3-2 shows the scenario where subnet 1 has no group members, but a downstream multicast router on subnet 1 has group members attached to one of the router's interfaces. The multicast traffic would need to be forwarded onto subnet 1. As shown, the Internet Group Management Protocol (IGMP) is used between hosts and routers, and the multicast routing protocols, Distance Vector Multicast Routing Protocol (DVMRP) and Protocol Independent Multicast (PIM), are used between multicast routers. IGMP is the mechanism used by hosts on a network to inform directly-attached routers which multicast group(s) the host wants to either join or leave.
A Host Membership Query message is received. 4. A Host Membership Report is received. 5. The host's delay timer has expired. When a host decides to join a multicast group, it does not know if any other hosts are on the network that are members of the group. If this host is the first member and the host waits for a Host Membership Query from the router, the host will wait forever. Therefore, when a host decides to join a multicast group, it should immediately send a Host Membership Report. The possibility exists, however, that this initial report message will not Page 48 Figure 3-10 IGMP Version 1 host state diagram reach the router.
Cisco Multicast Routing And Switching by William R. Parkhurst