ZyXEL ES-3148 Guida Utente

Chapter 22 Multicast

ES-3148 User’s Guide

Click Advanced Applications > Multicast in the navigation panel. Click the Multicast 
Setting link and then the IGMP Snooping VLAN link to display the screen as shown. See 

 for more information on IGMP Snooping VLAN.

Reserved 

Multicast Group

Multicast addresses (224.0.0.0 to 224.0.0.255) are reserved for the local scope. 

For examples, 224.0.0.1 is for all hosts in this subnet, 224.0.0.2 is for all multicast 

routers in this subnet, etc. A router will not forward a packet with the destination IP 

address within this range. See the IANA web site for more information.
Specify the action to perform when the Switch receives a frame with a reserved 

multicast address. Select Drop to discard the frame(s). Select Flooding to send 

the frame(s) to all ports. 

Port

This field displays the port number. 

*

Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use 

this row first to set the common settings and then make adjustments on a port-by-

port basis. 

Note: Changes in this row are copied to all the ports as soon as 

you make them.

Immed. Leave

Select this option to set the Switch to remove this port from the multicast tree 

when an IGMP version 2 leave message is received on this port.
Select this option if there is only one host connected to this port. 

Group Limited

Select this option to limit the number of multicast groups this port is allowed to join.

Max Group Num.

Enter the number of multicast groups this port is allowed to join. Once a port is 

registered in the specified number of multicast groups, any new IGMP join report 

frame(s) is dropped on this port.

IGMP Filtering 

Profile

Select the name of the IGMP filtering profile to use for this port. Otherwise, select 

Default to prohibit the port from joining any multicast group. 
You can create IGMP filtering profiles in the Multicast > Multicast Setting > 

IGMP Filtering Profile screen.

IGMP Querier 

Mode

The Switch treats an IGMP query port as being connected to an IGMP multicast 

router (or server). The Switch forwards IGMP join or leave packets to an IGMP 

query port. 
Select Auto to have the Switch use the port as an IGMP query port if the port 

receives IGMP query packets.
Select Fixed to have the Switch always use the port as an IGMP query port. 

Select this when you connect an IGMP multicast server to the port.
Select Edge to stop the Switch from using the port as an IGMP query port. The 

Switch will not keep any record of an IGMP router being connected to this port. 

The Switch does not forward IGMP join or leave packets to this port. 

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.

Table 57   Advanced Application > Multicast > Multicast Setting  (continued)