Planet SGSW-2840P4 [209/693] User s manual of sgsd 1022 sgsd 1022p sgsw 2840 sgsw 2840p

Planet SGSW-2840R [209/693] User s manual of sgsd 1022 sgsd 1022p sgsw 2840 sgsw 2840p
User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
209
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)
0x16 Membership Report (version 2)

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