ZyXEL ES-2108PWR User Guide - Page 138
Multicast Status, Multicast Setting
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Chapter 19 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. 19.1.4 IGMP Snooping and VLANs The Switch can perform IGMP snooping on VLANs. You can configure the Switch to automatically learn multicast group membership of any VLANs. The Switch then performs IGMP snooping on the first VLANs that send IGMP packets (see Table 105 on page 253 the User's Guide for how many VLANs the Switch can perform IGMP snooping on). 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. 19.2 Multicast Status Click Advanced Applications > Multicast to display the screen as shown. This screen shows the multicast group information. See Section 19.1 on page 137 for more information on multicasting. Figure 73 Advanced Application > Multicast: Status. The following table describes the labels in this screen. Table 42 Advanced Application > Multicast: Status LABEL DESCRIPTION Index This is the index number of the entry. VID This field displays the multicast VLAN ID. Port This field displays the port number that belongs to the multicast group. Multicast Group This field displays IP multicast group addresses. 19.3 Multicast Setting Click Advanced Application > Multicast > Multicast Setting link to display the screen as shown. See Section 19.1 on page 137 for more information on multicasting. 138 ES-2108 Series User's Guide