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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 4-3-5-3: 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
User's Manual of GS-5220-24T4XV(R) Managed LCD Switch
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