TP-Link T2600G-28MPS T2600G-28MPSUN V1 User Guide - Page 171
MLD Snooping
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General Query Source IP: IGMP Authentication: LAG: Enter the source IP of the general query frame sent by IGMP Snooping Querier. It should not be a multicast IP or a broadcast IP. Select Enable/Disable IGMP Authentication for the desired port. Displays the LAG number which the port belongs to. Note: The IGMP Authentication feature will take effect only when AAA function is enabled and the RADIUS server is configured. For how to enable AAA function and configure RADIUS server, please refer to 13.11 AAA. 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. After receiving the 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. 2. Relevant Ports of the Switch Router Port: Indicates the switch port that links toward the MLD router. Member Port: Indicates the switch port that links toward the multicast members. 3. Timers Router Port Aging Time: Within this time, if the switch does not receive MLD queries from the router port, it will delete this port from the router port list. The default value is 300 seconds. Member Port Aging Time: Within this time, if the switch does not receive MLD reports from the member port, it will delete this port from the MLD multicast group. The default value is 260 seconds. 160