Planet Networking & Communication WGS-4215-8P2S User Manual page 169

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
Type
The IGMP Type codes are shown below:
Type
0x11
0x11
Figure 4-7-5 IGMP Snooping Multicast Stream Control
16
Response Time
Group Address (all zeros if this is a query)
Meaning
Membership Query (if Group Address is 0.0.0.0)
Specific Group Membership Query (if Group Address is
Present)
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