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Chapter 61 Switching
GS2220 Series User’s Guide
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The following table describes the labels in this screen.
61.12 IGMP Snooping
A Switch can passively snoop on IGMP packets transferred between IP multicast routers or switches and
IP multicast hosts to learn the IP multicast group membership. It checks IGMP packets passing through it,
picks out the group registration information, and configures multicasting accordingly. IGMP snooping
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.
Click the IGMP Snooping link in the Switching > Multicast screen to display the screen as shown.
Table 257 Switching > Multicast > IPv4 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.