PLANET VC-810S - Manual (Page 62)

User’s Manual of VC-810S / VC-810S48
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Figure 4-38 Multicast flooding
Figure 4-39 IGMP snooping multicast stream control
IGMP Versions 1 and 2
Multicast groups allow members to join or leave at any time. IGMP provides the method for members and multicast routers
to communicate when joining or leaving a multicast group.
IGMP version 1 is defined in RFC 1112. It has a fixed packet size and no optional data.
The format of an IGMP packet is shown below: