Planet GS-4210 SERIES User Manual

Name: Planet GS-4210 SERIES
Brand: Planet
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User’s Manual of GS-4210 Series

Figure 4-7-5 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)

The IGMP Type codes are shown below:

Type Meaning

0x11

Membership Query (if Group Address is 0.0.0.0)

0x11

Specific Group Membership Query (if Group Address is

Present)

167

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