Igmp Snooping And Vlans; Multicast Status; Multicast Setting; Figure 81 Advanced Application > Multicast - ZyXEL Communications ZyXEL Dimension ES-4124 User Manual

Chapter 22 Multicast
The Switch forwards multicast traffic destined for multicast groups (that it has learned from
IGMP snooping or that you have manually configured) to ports that are members of that
group. IGMP snooping generates no additional network traffic, allowing you to significantly
reduce multicast traffic passing through your Switch.

22.1.4 IGMP Snooping and VLANs

The Switch can perform IGMP snooping on up to 16 VLANs. You can configure the Switch to
automatically learn multicast group membership of any VLANs. The Switch then performs
IGMP snooping on the first 16 VLANs that send IGMP packets. This is referred to as auto
mode. Alternatively, you can specify the VLANs that IGMP snooping should be performed
on. This is referred to as fixed mode. In fixed mode the Switch does not learn multicast group
membership of any VLANs other than those explicitly added as an IGMP snooping VLAN.

22.2 Multicast Status

Click Advanced Applications > Multicast to display the screen as shown. This screen shows
the multicast group information. See
multicasting.
Figure 81 Advanced Application > Multicast
The following table describes the labels in this screen.

Table 54 Multicast Status

LABEL
Index
VID
Port
Multicast Group

22.3 Multicast Setting

Click Advanced Applications > Multicast > Multicast Setting link to display the screen as
shown. See
176
DESCRIPTION
This is the index number of the entry.
This field displays the multicast VLAN ID.
This field displays the port number that belongs to the multicast group.
This field displays IP multicast group addresses.
Section 22.1 on page 175
Section 22.1 on page 175
for more information on multicasting.
for more information on
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