3Com 3C17300A Implementation Guide - Page 37

Management Interface Reference Guide supplied on your Switch, endstation's Network Interface Card NIC.

Page 37 highlights

IGMP Multicast Filtering 37 Management Interface Reference Guide supplied on your Switch CD-ROM. If IGMP multicast learning is not enabled then IP multicast traffic is always forwarded, that is, it floods the network. For information about configuring IGMP functionality on an endstation, refer to the user documentation supplied with your endstation or the endstation's Network Interface Card (NIC).

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IGMP Multicast Filtering
37
Management Interface Reference Guide supplied on your Switch
CD-ROM.
If IGMP multicast learning is not enabled then IP multicast traffic is always
forwarded, that is, it floods the network.
For information about configuring IGMP functionality on an endstation,
refer to the user documentation supplied with your endstation or the
endstation’s Network Interface Card (NIC).