Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 400
Joining and Filtering Groups and Sources, IGMP version 3 Membership Report Packet Format
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www.dell.com | support.dell.com Figure 22-3. IGMP version 3 Membership Report Packet Format Version IHL (4) TOS (0xc0) Total Length Flags Frag Offset TTL (1) Protocol (2) Header Checksum Src IP Addr Dest IP Addr (224.0.0.22) Options (Router Alert) Padding IGMP Packet Type Reserved 0x12: IGMP version 1 Membership Report 0x16: IGMP version 2 Membership Report 0x17: IGMP Leave Group 0x22: IGMP version 3 Membership Report Checksum Reserved Number of Group Records Group Record 1 Group Record 2 Group Record N Value used by IGMP to calculate multicast reception state Record Type Auxiliary Data Length (0) Number of Sources Multicast Address Source Addresses Auxiliary Data Length of Auxiliary Data field Group address to which the group record pertains None defined in RFC 3376 Range: 1-6 Number of source addresses Code: 1: Current state is Include to be filtered 2: Current state is Exclude 3: State change to Include 4: State change to Exclude 5: Allow new sources and no state change 6: Block old sources and no state change Source addresses to be filtered fnC0071mp Joining and Filtering Groups and Sources Figure 22-4 shows how multicast routers maintain the group and source information from unsolicited reports. 1. The first unsolicited report from the host indicates that it wants to receive traffic for group 224.1.1.1. 2. The host's second report indicates that it is only interested in traffic from group 224.1.1.1, source 10.11.1.1. Include messages prevent traffic from all other sources in the group from reaching the subnet, so before recording this request, the querier sends a group-and-source query to verify that there are no hosts interested in any other sources. The multicast router must satisfy all hosts if they have conflicting requests. For example, if another host on the subnet is interested in traffic from 10.11.1.3, then the router 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. Since 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. 400 | Internet Group Management Protocol
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