Note:
The IGMP pruning timer is triggered when an IGMP packet is received on the VLAN. A 510T switch must have a 550 series device with IP Multicast enabled in the same VLAN to trigger the timer.1.
Open Configure | VLAN/Routing.
2. Click Advanced.
3. Click IP Routing.
4. Click IGMP.
5. Enable IGMP pruning and enter a Pruning timeout.
6. Apply and Close.
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