TP-Link 10GE T1700G-28TQUN V1 User Guide - Page 136

MLD Snooping

Page 136 highlights

The following entries are displayed on this screen:  Auto Refresh Auto Refresh: Select Enable/Disable auto refresh feature. Refresh Period: Enter the time from 3 to 300 in seconds to specify the auto refresh period.  IGMP Statistics Unit: Port: Query Packet: Report Packet (V1): Click unit number to display the information of the physical ports associated with this unit member. Displays the port number of the switch. Displays the number of query packets the port received. Displays the number of IGMPv1 report packets the port received. Report Packet (V2): Report Packet (V3): Leave Packet: Error Packet: Displays the number of IGMPv2 report packets the port received. Displays the number of IGMPv3 report packets the port received. Displays the number of leave packets the port received. Displays the number of error packets the port received. 9.2 MLD Snooping  MLD Snooping Multicast Listener Discovery (MLD) snooping is applied for efficient distribution of IPv6 multicast data to clients and routers in a Layer 2 network. 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. The list is constructed and maintained by snooping IPv6 multicast control packets. MLD snooping performs a similar function in IPv6 as IGMP snooping in IPv4. The switch, running MLD snooping, listens to the MLD messages transmitted between the host and the router, and tracks the MLD messages and the registered port. When receiving MLD report message, the switch adds the port to the multicast address table; when the switch listens to MLD Done message from the host, the router sends the Multicast-Address-Specific Query message of the port to check if other hosts need this multicast, if yes, the switch will receive MLD report message; if no, the switch will receive no response from the hosts and the switch will remove the port from the multicast address table. The router regularly sends MLD query messages. The switch will remove the port from the multicast address table if the switch receives no MLD report message from the host within a period of time.  MLD Snooping Fundamentals 1. MLD Messages MLD Queries:MLD Queries include General Queries and Multicast-Address-Specific Queries (MASQs) and are sent out from the MLD router. MLD Reports:When a host wants to join a multicast group or responds to the MLD queries, it will send out an MLD report. MLD Done Messages:When a host wants to leave a multicast group, it will send out an MLD Done message to inform the IPv6 multicast routers of its leave. 126

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The following entries are displayed on this screen:
Auto Refresh
Auto Refresh:
Select Enable/Disable auto refresh feature.
Refresh Period:
Enter the time from 3 to 300 in seconds to specify the auto refresh
period.
IGMP Statistics
Unit:
Click unit number to display the information of the physical ports
associated with this unit member.
Port:
Displays the port number of the switch.
Query Packet:
Displays the number of query packets the port received.
Report Packet (V1):
Displays the number of IGMPv1 report packets the port received.
Report Packet (V2):
Displays the number of IGMPv2 report packets the port received.
Report Packet (V3):
Displays the number of IGMPv3 report packets the port received.
Leave Packet:
Displays the number of leave packets the port received.
Error Packet:
Displays the number of error packets the port received.
9.2 MLD Snooping
MLD Snooping
Multicast Listener Discovery (MLD) snooping is applied for efficient distribution of IPv6 multicast
data to clients and routers in a Layer 2 network. 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. The list is constructed and maintained by snooping IPv6 multicast control packets.
MLD snooping performs a similar function in IPv6 as IGMP snooping in IPv4.
The switch, running MLD snooping, listens to the MLD messages transmitted between the host
and the router, and tracks the MLD messages and the registered port. When receiving MLD report
message, the switch adds the port to the multicast address table; when the switch listens to MLD
Done message from the host, the router sends the Multicast-Address-Specific Query message of
the port to check if other hosts need this multicast, if yes, the switch will receive MLD report
message; if no, the switch will receive no response from the hosts and the switch will remove the
port from the multicast address table. The router regularly sends MLD query messages. The
switch will remove the port from the multicast address table if the switch receives no MLD report
message from the host within a period of time.
MLD Snooping Fundamentals
1.
MLD Messages
MLD Queries
MLD Queries include General Queries and Multicast-Address-Specific Queries
(MASQs) and are sent out from the MLD router.
MLD Reports
When a host wants to join a multicast group or responds to the MLD queries, it will
send out an MLD report.
MLD Done Messages
When a host wants to leave a multicast group, it will send out an MLD
Done message to inform the IPv6 multicast routers of its leave.
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