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MLD SNOOPING CONFIGURATION
When configuring MLD Snooping, go to these sections for information you are
interested in:
■ “MLD Snooping Overview” on page 579
■ “MLD Snooping Configuration Task List” on page 583
■ “Displaying and Maintaining MLD Snooping” on page 595
■ “MLD Snooping Configuration Examples” on page 596
■ “Troubleshooting MLD Snooping” on page 602
MLD Snooping
Overview
Multicast Listener Discovery Snooping (MLD Snooping) is an IPv6 multicast
constraining mechanism that runs on Layer 2 devices to manage and control IPv6
multicast groups.
Introduction to MLD
Snooping
By analyzing received MLD messages, a Layer 2 device running MLD Snooping
establishes mappings between ports and multicast MAC addresses and forwards
IPv6 multicast data based on these mappings.
As shown in Figure 175, when MLD Snooping is not running, IPv6 multicast
packets are broadcast to all devices at Layer 2. When MLD Snooping runs,
multicast packets for known IPv6 multicast groups are multicast to the receivers at
Layer 2.
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