Mld Control Messages - D-Link xStack DGS-3200-10 User Manual

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MLD Control Messages

Three t ypes of m essages are t ransferred be tween de vices usi ng M LD snooping. T hese t hree m essages are al l de fined by f our
ICMPv6 packet headers, labeled 130, 131, 132, and 143.
1. Multicast Listener Query – Sim ilar to th e IGMPv 2 Host Mem bership Query fo r IPv4, an d labeled as 130 in th e
ICMPv6 packet header, this message is sent by the router to ask if an y link is requ esting multicast data. There are two
types of MLD query messages emitted by the router. The General Query is used to advertise all multicast addresses that
are read y to send m ulticast data to all listen ing ports, and the M ulticast Specific query, which a dvertises a s pecific
multicast ad dress th at is also read y. Th ese two typ es of messages are distinguished by a m ulticast d estination add ress
located in the IPv6 header and a multicast address in the Multicast Listener Query Message.
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 s ent by the listening port to the Switc h stating that it is inte rested in receiving
multicast data from a multicast address in response to the Multicast Listener Query message.
3. Multicast Listener Done – Akin to th e Leav e Group Messag e in IGMPv2, and lab eled as 132 in the ICMPv6 p acket
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.
4. 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 s ent by the listening port to the Switc h stating that it is inte rested in receiving
multicast data from a multicast address in response to the Multicast Listener Query message.
Users can configure the settings for MLD snooping.
To view the following window, click L2 Features > MLD Snooping Settings:
This window displays the current MLD Snooping settings set on the Switch, defined by VLAN.
The following parameters may be viewed:
Parameter
VID
VLAN Name
Done Timer
Node Timeout
Router Timeout
®
DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
Figure 3 - 37. MLD Snooping Settings window
Description
This is the VLAN ID that, along with the VLAN Name, identifies the VLAN for which
to modify the MLD Snooping Settings.
This is the VLAN Name that, along with the VLAN ID, identifies the VLAN for which
to modify the MLD Snooping Settings.
Specifies the maximum amount of time a group will remain in the Switch after
receiving a 'Done' message from the group, without receiving a 'node listener' report.
The user may specify a time between 1 and 16711450 with a default setting of 2
seconds.
Specifies the link node timeout, in seconds. After this timer expires, this node will no
longer be considered as listening node. The user may specify a time between 1 and
16711450 with a default setting of 260 seconds.
Specifies the maximum amount of time a dynamically learned router port will remain
in the Switch's routing table, before it times out. The user may specify a time
between 1 and 16711450 with a default setting of 260 seconds.
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