Microsoft Press windows server 2008 tcp ip protocols and services phần 5

The Host IGMPv3 tin nhắn thành viên Báo cáo chứa một hoặc nhiều hồ sơ nhóm. Máy chủ gửi IGMPv3 tin nhắn Host Báo cáo thành viên địa chỉ multicast , một địa chỉ multicast dành riêng cho tất cả các bộ định tuyến multicast có khả năng IGMPv3. Mỗi bản ghi nhóm chứa các địa chỉ nhóm và danh sách các nguồn có thể bao gồm | Chapter 7 Internet Group Management Protocol IGMP 171 Type Maximum Response Time Checksum Group Address Reserved Suppress Router-Side Processing Querier s Robustness Variable Querier s Query Interval Number of Sources Source Address 1 . Source Address n lllllll 0x11 IIIIIII IIIIIII IIIIIII III limn IIIIIIIIIIIIII 0 lllllll lllllll mini num num num num num Figure 7-5 The structure of the IGMPv3 Host Membership Query message For more information about the operation of an IGMPv3 router see RFC 3376. IGMPv3 Host Membership Report The IGMPv3 Host Membership Report message contains one or more group records. Hosts send IGMPv3 Host Membership Report messages to the multicast address a reserved multicast address for all IGMPv3-capable multicast routers. Each group record contains the group address and the list of sources to either include or exclude. Figure 7-6 shows the structure of the IGMPv3 Host Membership Report message. Type Reserved Checksum Reserved Number of Group Records Group Record 1 . Group Record n IIIIIII 0x22 0 IIIIIII IIIIIII num IIIIIII num IIIIIII limn limn limn limn num num Figure 7-6 The structure of the IGMPv3 Host Membership Report message 172 Part II Internet Layer Protocols The IGMPv3 Host Membership Report message contains the following fields Type A 1-byte field set to 0x22 to indicate an IGMPv3 Host Membership Report message. Reserved A 1-byte field set to 0 by the sender and ignored by the receiver. Checksum A 2-byte field that stores a checksum on the IGMPv3 message. Reserved A 2-byte field set to 0 by the sender and ignored by the receiver. Number Of Group Records A 2-byte field that indicates the number of group records contained in the message. Group Record A variable-sized field that contains a multicast address on which the sending host is listening and either an include list or exclude list of sources. Figure 7-7 shows the structure of an IGMPv3 Host Membership Report message group record. Record Type IIIIIII Auxiliary Data .