ZyXEL Communications XGS4600 Series User Manual page 263

Figure 204 Advanced Application > Multicast > IPv4 Multicast > IGMP Snooping (Stacking Mode)
The following table describes the labels in this screen.
Table 102 Advanced Application > Multicast > IPv4 Multicast > IGMP Snooping
LABEL DESCRIPTION
IGMP Snooping Use these settings to configure IGMP snooping.
Active Select Active to enable IGMP Snooping to forward group multicast traffic only to ports that
are members of that group.
Querier Select this option to allow the Switch to send IGMP General Query messages to the VLANs with
the multicast hosts attached.
Querier Version IGMP snooping query works only when both host and Switch support the same IGMP version.
Select v2 to allow the Switch to send IGMPv2 queries only.
Select v3 to allow the Switch to send IGMPv3 queries only.
Report Proxy Select this option to allow the Switch to act as the IGMP report proxy and leave proxy. It will
report group changes to a connected multicast router.
The Switch not only checks IGMP packets between multicast routers or switches and multicast
hosts to learn the multicast group membership, but also replaces the source MAC address in
an IGMP v1/v2 report with its own MAC address before forwarding to the multicast router or
switch. When the Switch receives more than one IGMP v1/v2 join report that requests to join
the same multicast group, it only sends a new join report with its MAC address. This helps
reduce the number of multicast join reports passed to the multicast router or switch.
The Switch sends a leave message with its MAC address to the multicast router or switch only
when it receives the leave message from the last host in a multicast group.
Chapter 25 Multicast
XGS4600 Series User's Guide
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