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DES-3200-10/18/28/28F Layer 2 Ethernet Managed Switch User Manual
2. Multicast Listener Report, Version 1 – Comparable to the Host Membership Report in IGMPv2, and labeled
as 131 in the ICMP packet header, this message is sent by the listening port to the Switch stating that it is
interested in receiving multicast data from a multicast address in response to the Multicast Listener Query
message.
3. Multicast Listener Done – Akin to the Leave Group Message in IGMPv2, and labeled as 132 in the ICMPv6
packet header, this message is sent by the multicast listening port stating that it is no longer interested in
receiving multicast data from a specific multicast group address, therefore stating that it is “done” with the
multicast data from this address. Once this message is received by the Switch, it will no longer forward
multicast traffic from a specific multicast group address to this listening port.
If implementing MLD snooping version 2, two types of messages are transferred between devices. The two messages
are defined by two ICMPv6 packet headers, labeled 130 and 143.
1. Multicast Listener Query, Version 2 – Similar to the IGMPv3 Membership Query for IPv4, and labeled as
130 in the ICMPv6 packet header, this message is sent by the router to ask if any link is requesting multicast
data. With MLD snooping version 2, there are three types of MLD query messages emitted by the router, as
described below:
• The router sends a General Query message to learn which multicast addresses have listeners on an
attached link. In a General Query, both the Multicast Address field and the Number of Sources field
are set to zero.
• The router sends a Multicast Address Specific Query message to learn if a particular multicast
address has any listeners on an attached link. In a Multicast Address Specific Query, the Multicast
Address field contains the multicast address that the router is interested in, while the Number of
Sources field is set to zero.
• The router sends a Multicast Address and Source Specific Query to learn if any of the sources from
the specified list for the particular multicast address has any listeners on an attached link or not. In a
Multicast Address and Source Specific Query the Multicast Address field contains the multicast
address that the router is interested in, while the Source Address field(s) contain(s) the source
address(es) that the router is interested in.
2. Multicast Listener Report, Version 2 - Comparable to the Host Membership Report in IGMPv3, and labeled
as 143 in the ICMP packet header, this message is sent by the listening port to the Switch stating that it is
interested in receiving multicast data from a multicast address in response to the Multicast Listener Query
message.
This window is used to enable MLD Snooping on the Switch and to configure the settings for MLD snooping. To
enable the MLD Snooping State, click the Enable radio button under MLD Snooping Global Settings and click Apply.
To view this window, click L2 Features > MLD Snooping Settings:
Figure 3 - 36. MLD Snooping Settings window
To configure the settings for an existing entry click the corresponding Edit button which will display the following
window.
Figure 3 - 37. MLD Snooping Settings (Edit) window
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