3com 2928 User Guide
1-7
Item
Description
Drop Unknown
Enable or disable the function of dropping unknown multicast packets.
Unknown multicast data refer to multicast data for which no entries exist in
Unknown multicast data refer to multicast data for which no entries exist in
the IGMP snooping forwarding table.
z
With the function of dropping unknown multicast data enabled, the switch
drops all the unknown multicast data received.
z
With the function of dropping unknown multicast data disabled, the
switch floods unknown multicast data in the VLAN to which the unknown
multicast data belong.
Querier
Enable or disable the IGMP snooping querier function.
On a network without Layer 3 multicast devices, no IGMP querier-related
On a network without Layer 3 multicast devices, no IGMP querier-related
function can be implemented because a Layer 2 device does not support
IGMP. To address this issue, you can enable IGMP snooping querier on a
Layer 2 device so that the device can generate and maintain multicast
forwarding entries at data link layer, thereby implementing IGMP
querier-related functions.
Query interval
Configure the IGMP query interval.
Configuring IGMP Snooping Port Functions
Select Network > IGMP Snooping in the navigation tree to enter the basic configuration page and then
click the Advanced tab to enter the page shown in
click the Advanced tab to enter the page shown in
Figure 1-5
Advanced configuration
describes items for configuring advanced IGMP snooping features.