Internet the Group management Protocol (IGMP) is network minutes of the Internet minutes family and serves for the organization of groups of multicast. IGMP used like ICMP Internet minutes (IP) and is an integral component of IP on all host, which support the receipt of IP-Multicasts.

Use

Internet the Group management Protocol is based on the Internet Protocol (IP), which makes IP-Multicasting (group communication) in the Internet possible. IP-Multicasting is simultaneous the distribution of IP packages under a IP address to several stations. IGMP offers the possibility to groups to administer dynamically. The administration does not take place in the master station, but into routing at those receivers of a group of multicast are directly attached. IGMP offers functions, with which a station one rout communicates that she wants to receive multicast IP packages of a certain group of multicast. Multicast Routing minutes (DVMRP, MOSPF, PIM), take over the co-ordination of the transmission between routing. The transmitter of multicast IP packages does not know thereby, which and how many stations receive its packages. Because it sent away only one packet at his superordinate rout. The IP package duplicates if necessary, if it has several outgoing interfaces with receivers.

Package format

IGMP of packages (starting from version 2) have a size of 64bit. The following format is used:

The following values for the type can be taken:

IGMP of packages become, like ICMP, in IP datagrams totally enclosed and use the IP minutes number 2.

Related links

• RFC 1112 - Host Extensions for IP Multicasting
• RFC 2236 - Internet Group management Protocol, version 2
• RFC 3376 - Internet Group management Protocol, version 3

Articles in category "Internet Group management Protocol"

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Related Websites

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• Internet Group Management Protocol - a definition from Whatis.com ...
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