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Configuring Switching Information
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GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
MLD Snooping
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 sub protocol of Internet Control Message Protocol version 6
(ICMPv6), and MLD messages are a subset of ICMPv6 messages, identified in IPv6 packets
by a preceding Next Header value of 58.
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.
The MLD snooping link contains features described in the following sections:
MLD Snooping Configuration
MLD VLAN Configuration
Multicast Router VLAN Configuration
MLD Snooping Configuration
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 IP multicast address. In IPv6, 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.
To configure MLD snooping:
1. Select Switching Multicast MLD Snooping MLD Snooping Configuration.
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