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3com S7906E Guide De Référence

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Use the undo igmp-snooping command to disable IGMP Snooping globally.  
By default, IGMP Snooping is disabled.  
Related commands: igmp-snooping enable.  
Examples 
# Enable IGMP Snooping globally and enter IGMP-Snooping view.  
<Sysname> system-view 
[Sysname] igmp-snooping 
[Sysname-igmp-snooping] 
igmp-snooping drop-unknown 
Syntax 
igmp-snooping drop-unknown 
undo igmp-snooping drop-unknown 
View 
VLAN view 
Default Level 
2: System level 
Parameters 
None 
Description 
Use the igmp-snooping drop-unknown command to enable the function of dropping unknown 
multicast data in the current VLAN, so that such multicast data will only be forwarded to router ports.  
Use the undo igmp-snooping drop-unknown command to disable the function of dropping unknown 
multicast data in the current VLAN.  
By default, this function is disabled, that is, unknown multicast data is flooded.  
This command takes effect only if IGMP Snooping is enabled in the VLAN.  
Related commands: igmp-snooping enable and drop-unknown.  
Examples 
# In VLAN 2, enable IGMP Snooping and the function of dropping unknown multicast data.  
<Sysname> system-view 
[Sysname] igmp-snooping 
[Sysname-igmp-snooping] quit 
[Sysname] vlan 2 
[Sysname-vlan2] igmp-snooping enable 
[Sysname-vlan2] igmp-snooping drop-unknown