Dell PowerEdge M420 Configuration Manual page 728

4 Select the Copy To checkbox for the Unit/Ports, LAGs, or VLANs that
these parameters will be copied to.
In Figure 25-8, the settings for port 3 will be copied to ports 4 and 5 and
LAGs 1 and 2.
Figure 25-8. Copy IGMP Snooping Settings
5 Click Apply.
The IGMP Snooping settings are modified, and the device is updated.
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Configuring L2 Multicast Features