By William R. Parkhurst
Scorching booklet on a scorching technology--Cisco's new iteration of routers is designed to deal with IP Multicasting, an important to video conferencing and groupware. step by step assistance on how you can set up and troubleshoot multicasting in a Cisco Router setting. entire assurance of present and destiny intranet multicast routing protocols, interoperability framework, net crew administration protocol, and extra. From the revered writer of McGraw-Hill's Cisco Router OSPF layout and Configuration consultant.
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Additional resources for Cisco Multicast Routing And Switching
Because no members are present on the network, the router does not need to periodically transmit General Membership Queries out of the interface. Routers will be notified by hosts that want to join a particular group. A host can either transmit a version 1 or version 2 IGMP Membership report. If only version 2 Membership Reports are received, the router will make a transition to the Members Present state. If a version 1 report is received, then the router will make a transition to the Version 1 Members Present state, even though there may be version 2 hosts present.
VLSM Example 1 Let's apply VLSM to the network in Figure 2-5. 0. 0. 0, will be sub-subnetted using a /30 subnet mask, which will give us a possible 62 sub-subnets we can use for serial connections. 0. Figure 2-6 illustrates this technique. Figure 2-6 visually represents the technique that should be used when using VLSM. Start with the standard subnet mask (/8, /16, or /24 for Class A, B, or C). Determine the network with the required maximum number of hosts, in this case 254. Then subnet using a mask that will give you networks that can handle the largest number of hosts you need.
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. The host should make a transition from the Non-Member state to the Delaying Member state, as though the host had received a Host Membership Query message. The host then starts the delay timer. If a Host Membership Report is received, the host stops the timer and makes a transition to the Idle Member state. If the timer expires, the host sends a Host Membership Report message to the router and then moves to the idle state.