D-Link DGS-1210-08P - L2 Functions > Multicast > IGMP Snooping

4 Web-based Switch Configuration D-Link Smart Managed Switch User Manual
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By default, Auto IGMP is Disabled. By click Apply on Enabled, the IGMP snooping Global State would be
changed to Enabled corresponding.
Auto IGMP VLAN refers the specific VLAN groups which would be added into Auto IGMP group table.
By Adding the VLAN group into Auto IGMP, the following parameters would be changed:
 Enable IGMP Snooping (The IGMP Snooping, if in Disabled mode, will be changed to Enabled mode)
 IGMP Snooping Querier enabled
 IGMP Snooping Fast Leave enabled
 Multicast Filter mode changed to Filtered for all interfaces
Delete the specific VLAN group in Auto IGMP table would take the following actions:
 IGMP Snooping Querier restored to default configuration
 IGMP Snooping Fast Leave restored to default configuration
NOTE:
The “Delete” button associated with
individual VLAN represents the activity to remove
Auto IGMP functionality in that VLAN. By doing so,
all of the IGMP Snooping features to that VLAN will
restore its default settings. The VLAN itself is not
going to be deleted.
L2 Functions > Multicast > IGMP Snooping
With Internet Group Management Protocol (IGMP) snooping, the Smart Managed Switch can make
intelligent multicast forwarding decisions by examining the contents of each frame’s Layer 2 MAC header.
IGMP snooping can help reduce cluttered traffic on the LAN. With IGMP snooping enabled globally, the
Smart Managed Switch will forward multicast traffic only to connections that have group members attached.
The default IGMP Snooping version is v3, which works compatible with IGMP versions v1 and v2.
The DGS-1210 series support IGMP v1/v2/v3 awareness. And the IGMP v3 awareness means that we do
support IGMP v3 snooping, in other words, switch can read/understand the IGMP control packet which is
version3. The Switch still can based on its report/leave packet to do the correct behavior. But from the RFC
point of view, full IGMP v3 means that it should support source filtering and it’s not possible to support on the
L2 switch.
The settings of IGMP snooping is set by each VLAN individually.