HP 6125XLG R2306-HP 6125XLG Blade Switch IP Multicast Configuration Guide - Page 20
Configuring IGMP snooping, Overview, Basic IGMP snooping concepts, IGMP snooping related ports
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Configuring IGMP snooping Overview IGMP snooping runs on a Layer 2 switch as a multicast constraining mechanism to improve multicast forwarding efficiency. It creates Layer 2 multicast forwarding entries from IGMP packets that are exchanged between the hosts and the router. As shown in Figure 10, when IGMP snooping is not enabled, the Layer 2 switch floods multicast packets to all hosts. When IGMP snooping is enabled, the Layer 2 switch forwards multicast packets of known multicast groups to only the receivers. Figure 10 Multicast packet transmission without and with IGMP snooping Basic IGMP snooping concepts IGMP snooping related ports As shown in Figure 11, IGMP snooping runs on Switch A and Switch B, and Host A and Host C are receivers in a multicast group. 13
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