If the equipment in the network supports IGMP v3, host A wants to receive the traffic from S1
only, it can send the IGMPv3 packet of join G include S1. If host B wants to receive the traffic
from S2 only, it can send the IGMPv3 packet of join G include S2. Therefore, the traffic is
forwarded as shown in the following diagram, saving some bandwidth.
Figure 35-3
In contrast to Version 2, Version 3 defines the following two packet types:
Membership Query
Version 3 Membership Report
There are three types of Membership Query:
General Query Used to query all multicast members under an interface:
Group-Specific Query Used to query the members of the specified group under an
interface
Group-and-Source-Specific Query Added in IGMPv3, used to check whether a
member under an interface needs to receive multicast traffic of a group sent from a
source in the specified source list
Different from the Membership Report in IGMP Version2, the Membership Report in the
IGMP Version3 always has the destination address of 224.0.0.22. The Membership Report
packets in IGMP Version3 include the information of multiple groups.
The IGMP Version3 also recognizes the Membership Report of both Versions 1 and 2 and
the Leave Group packet of Version 2.
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