Netgear S3300-28X-PoE+ (GS728TXP) - ProSAFE S3300 Smart Switch Series 管理者ガイド

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, 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.

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.

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Select Switching

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 MLD Snooping Configuration.

From the MLD Snooping Admin Mode list, select Enable to enable the administrative mode 
for MLD snooping on the switch. 

Click the Apply button. 

Last Querier Address

The IP address of the last querier from which a query was snooped on the 
VLAN.

Last Querier Version

The IGMP protocol version of the last querier from which a query was 
snooped on the VLAN.

Operational Max 
Response Time

The maximum response time to be used in the queries that are sent by the 
snooping querier.