Dell S4048T Configuration Manual page 429

cannot record the include request. There are no other interested hosts, so the request is recorded. At
this point, the multicast routing protocol prunes the tree to all but the specified sources.
3 The host's third message indicates that it is only interested in traffic from sources 10.11.1.1 and 10.11.1.2.
Because this request again prevents all other sources from reaching the subnet, the router sends another
group-and-source query so that it can satisfy all other hosts. There are no other interested hosts so the
request is recorded.
Figure 50. Membership Reports: Joining and Filtering
Internet Group Management Protocol (IGMP) 429