Configuring MLD Snooping
D-Link
Unified Wired and Wireless Access System
Oct. 2015
Page 226
D-Link UWS User Manual
Configuring MLD Snooping
In IPv4, Layer 2 switches can use IGMP snooping to limit the flooding of multicast traffic by dynamically
configuring Layer-2 interfaces so that multicast traffic is forwarded to only those interfaces associated with an
IP multicast address. In IPv6, Multicast Listener Discovery (MLD) snooping performs a similar function. With
MLD snooping, IPv6 multicast data is selectively forwarded to a list of ports that want to receive the data,
instead of being flooded to all ports in a VLAN. This list is constructed by snooping IPv6 multicast control
packets.
MLD is a protocol used by IPv6 multicast routers to discover the presence of multicast listeners (nodes wishing
to receive IPv6 multicast packets) on its directly-attached links and to discover which multicast packets are of
interest to neighboring nodes. MLD is derived from IGMP; MLD version 1 (MLDv1) is equivalent to IGMPv2 and
MLD version 2 (MLDv2) is equivalent to IGMPv3. MLD is a subprotocol of Internet Control Message Protocol
version 6 (ICMPv6), and MLD messages are a subset of ICMPv6 messages.
The switch can snoop on both MLDv1 and MLDv2 protocol packets and bridge IPv6 multicast data based on
destination IPv6 multicast MAC addresses. The switch can be configured to perform MLD snooping and IGMP
snooping simultaneously.
Configuration and Status
Use the MLD Snooping Global Configuration and Status page to enable MLD snooping on the switch and view
information about the current MLD snooping configuration.
To access this page, click
LAN > L2 Features
> MLD Snooping > Configuration and Status
in the navigation tree.
Figure 131: MLD Snooping Global Configuration and Status
Table 115: MLD Snooping Global Configuration and Status Fields
Field
Description
Admin Mode
Select the administrative mode for MLD Snooping for the switch from the
pulldown menu. The default is disable.
Multicast Control Frame
Count
Shows the number of multicast control frames that have been processed by
the CPU.
Interfaces Enabled for MLD
Snooping
Lists the interfaces currently enabled for MLD Snooping. To enable interfaces
for MLD snooping, see
Summary of Contents for DWL-8600AP
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