TP-Link T1500-28PCT T1500-28PCTTL-SL2428PUN V3 User Guide - Page 240
Follow these steps to con IGMP Snooping for a specific VLAN, Enable IGMP Snooping for the VLAN
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Configuring Layer 2 Multicast Figure 2-2 Configure IGMP Snooping for VLAN IGMP Snooping Configuration Follow these steps to configure IGMP Snooping for a specific VLAN: 1) Enable IGMP Snooping for the VLAN, and configure the corresponding parameters. VLAN ID Displays the VLAN ID. IGMP Snooping Status Enable or disable IGMP Snooping for the VLAN. Fast Leave Enable or disable Fast Leave for the VLAN. IGMPv1 does not support Fast Leave. Without Fast Leave, after a receiver sends an IGMP leave message to leave a multicast group, the switch will forward the leave 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 leave message from the switch, the querier will send out a configured number (Last Member Query Count) of group-specific queries on that port with a configured interval (Last Member Query Interval), and wait for IGMP group membership reports. If there are other receivers connecting to the switch, they will response to the queries before the Last Member 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 leave 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 leave 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 leave message from the VLAN. User Guide 217
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