Interlogix GE-DS-242-PoE - Manual (Page 102)

Chapter 4: Web-Based Management
98 GE-DS-242-PoE Managed Ethernet Switch User Manual
Figure 4-53: 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:
IGMP Message Format
Octets
0 8 16
31
Type Response
Time Checksum
Group Address (all zeros if this is a query).