Chapter 21 Multicast
GS1915 Series User’s Guide
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allows the Switch to learn multicast groups without you having to manually configure them.
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.
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.
21.2 Multicast Setup
Use this screen to configure IGMP for IPv4. Click
Advanced Application
>
Multicast
in the navigation
panel.
Figure 117
Advanced Application > Multicast Setup
The following table describes the labels in this screen.
21.3 IPv4 Multicast Status
Click
Advanced Application
>
Multicast
>
IPv4 Multicast
to display the screen as shown. This screen
shows the IPv4 multicast group information. See
for more information on
multicasting.
Figure 118
Advanced Application > Multicast > IPv4 Multicast
Table 76 Advanced Application > Multicast Setup
LABEL
DESCRIPTION
IPv4 Multicast
Click the link to open screens where you can configure IGMP snooping for IPv4.