D-Link DAS-3216_revB 用户手册

IGMP Snooping Leave message processing mode for the port.   
 
If the mode is set to 'Normal', the Leave message is forwarded to the Querier 
and then based on the Query received from Querier the Leave processing is 
triggered.  
 
If the mode is set to 'Fast', the port is immediately deleted from that multicast 
group on Leave message reception and then the Leave message is forwarded. 
The mode should be set to 'Fast' for a port only if there is one host behind the 
port. This is because if there are multiple hosts behind the port then it will lead 
to traffic disruption for other hosts who might still be listening to that multicast 
group.  
 
If mode is set to 'FastNormal', the Leave message is forwarded and the Leave 
processing is triggered immediately without waiting for any trigger from the 
Querier. 'FastNormal' mode thus saves the delay (equal to the time taken for 
Leave message to reach router and Querier processing time for it and the time 
taken for Query to reach IGMP Snoop module) in Leave processing. 
 

Leave Mode 

 Press 

the 

‘Commit’ button to confirm the setting. 

 Press 

the 

‘Modify’ button to change the setting.   

 
 
 
Click ‘Modify’ to change the setting of IGMP Snooping for the whole system and individual port. 
Figure 4-23 shows the dialog to enable/disable IGMP Snooping feature.   
 
 
 

 

 

 
 

AMS 
Software Specification and Introduction Guide