TP-Link T1600G-18TS Jetstream Smart Switches User Guide - Page 255
Listener Query Count of Multicast-Address-Specific Queries MASQs on
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Configuring Layer 2 Multicast MLD Snooping Configuration Fast Leave Report Suppression Member Port Aging Time Router Port Aging Time Enable or disable Fast Leave for the VLAN. Without Fast Leave, after a receiver sends an MLD done message (equivalent to an IGMP leave message) to leave a multicast group, the switch will forward the done message to the Layer 3 device (the querier). From the point of view of the querier, the port connecting to the switch is a member port of the corresponding multicast group. After receiving the done message from the switch, the querier will send out a configured number (Last Listener Query Count) of Multicast-Address-Specific Queries (MASQs) on that port with a configured interval (Last Listener Query Interval), and wait for MLD reports. If there are other receivers connecting to the switch, they will response to the MASQs before the Last Listener Query Interval expires. If no reports are received after the response time of the last query expires, the querier will remove the port from the forwarding list of the corresponding multicast group. That is, if there are other receivers connecting to the switch, the one sent done message have to wait until the port ages out from the switch's forwarding list of the corresponding multicast group (the maximum waiting time is decided by the Member Port Aging Time). With Fast Leave enabled on a VLAN, the switch will remove the (Multicast Group, Port, VLAN) entry from the multicast forwarding table before forwarding the done message to the querier. This helps to reduce bandwidth waste since the switch no longer sends the corresponding multicast streams to the VLAN of the port as soon as the port receives a done message from the VLAN. Enable or disable Report Suppression for the VLAN. When enabled, the switch will only forward the first MLD report message for each multicast group to the MLD querier and suppress subsequent MLD report messages for the same multicast group during one query interval. This feature prevents duplicate report messages from being sent to the MLD querier. Specify the aging time of the member ports in the VLAN. Once the switch receives an MLD report message from a port, the switch adds this port to the member port list of the corresponding multicast group. Member ports that are learned in this way are called dynamic member ports. If the switch does not receive any MLD report messages for a specific multicast group from a dynamic member port, it will no longer consider this port as a member port of this multicast group and delete it from the multicast forwarding table. Specify the aging time of the router ports in the VLAN. Once the switch receives an MLD general query message from a port, the switch adds this port to the router port list. Router ports that are learned in this way are called dynamic router ports. If the switch does not receive any MLD general query messages from a dynamic router port within the router port aging time, the switch will no longer consider this port as a router port and delete it from the router port list. User Guide 230