ZyXEL Communications 4528F User Manual

Chapter 38 IGMP

XGS-4526/4528F/4728F User’s Guide

Click IP Application > IGMP in the navigation panel to display the screen as 
shown next. Each entry in the table is automatically created when you configure a 
new IP domain in the IP Setup screen (refer to 

).

Figure 172   IP Application > IGMP 

The following table describes the labels in this screen. 

Table 123   IP Application > IGMP 

Active

Select this check box to enable IGMP on the Switch. 

Note: You cannot enable both IGMP snooping and IGMP at the same 

time. Refer to 

 for more information on 

IGMP snooping. 

Unknown 
Multicast 
Frame

Specify the action to perform when the Switch receives an unknown 
multicast frame. Unknown multicast frames are addressed to multicast 
groups for which the Switch has not recorded any group members. Select 
Drop to discard the frame(s). Select Flooding to send the frame(s) to all 
ports. 

Index

This field displays an index number of an entry. 

Network

This field displays the IP domain configured on the Switch. 

Refer to 

 for more information on configuring IP 

domains. 

Version 

Select an IGMP version from the drop-down list box. The choices are IGMP-
v1, IGMP-v2, IGMP-v3 and None. 

Generally, if you want to enable IGMP on the Switch, you should choose 
IGMP-v3 as it is compatible with older versions. Choose an earlier version of 
IGMP (IGMP-v2 or IGMP-v1) if the multicast hosts on your network can not 
recognize IGMP version 3 or version 2 Query messages.

Apply

Click Apply to save your changes to the Switch’s run-time memory. The 
Switch loses these changes if it is turned off or loses power, so use the Save 
link on the top navigation panel to save your changes to the non-volatile 
memory when you are done configuring.

Cancel

Click Cancel to begin configuring this screen afresh.