Configuring Igmp Snooping - HP FlexNetwork 7500 Series Configuration Manual

Configuring IGMP snooping

Overview
IGMP snooping runs on a Layer 2 device 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
packets to all hosts in a VLAN. 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
IGMP snooping ports
As shown in
receivers in a multicast group. IGMP snooping ports are divided into member ports and router ports.
Figure 10, when IGMP snooping is not enabled, the Layer 2 switch floods multicast
Figure 11, IGMP snooping runs on Switch A and Switch B, and Host A and Host C are
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