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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.
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.
39.2 IPv4 Multicast Status
Click SWITCHING > Multicast > IPv4 Multicast > IPv4 Multicast Status to display the screen as shown. This
screen shows the IPv4 multicast group information. See
on multicasting.
Figure 156 SWITCHING > Multicast > IPv4 Multicast > IPv4 Multicast Status
The following table describes the labels in this screen.
Table 115 SWITCHING > Multicast > IPv4 Multicast > IPv4 Multicast Status
LABEL
Index
VID
Port
Multicast Group
Chapter 39 Multicast
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.
XMG1915 Series User's Guide
223
Section 39.1 on page 222
for more information
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Troubleshooting
