Configuring Mld Snooping; Overview; Basic Concepts In Mld Snooping - HP 5920 series Configuration Manual

Configuring MLD snooping

Overview

MLD snooping enables Layer 2 switches to establish a Layer 2 multicast forwarding table instead of
flooding all multicast packets. To populate the Layer 2 multicast forwarding table, MLD snooping listens
to MLD messages exchanged between a Layer 3 multicast device and hosts.
As shown in
to all devices. With MLD snooping enabled, the Layer 2 switch forwards multicast packets of known IPv6
multicast groups to only the receivers that require the data at Layer 2. This feature improves bandwidth
efficiency, enhances multicast security, and helps per-host accounting for multicast users.
Figure 35 Multicast packet transmission processes without and with MLD snooping

Basic concepts in MLD snooping

MLD snooping related ports
As shown in
receiver hosts as members of an IPv6 multicast group.
Figure 35, without MLD snooping enabled, the Layer 2 switch floods IPv6 multicast packets
Figure 36, MLD snooping runs on Switch A and Switch B, and Host A and Host C are
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