AMX Wireless Touch Panels (Wave Server) Instrukcja Użytkownika Pobierz pdf (Strona 25)

AMX AV/IT Administrators Guide

Rev. 1.0 (7/29/2014) www.amx.com Page 22

IGMP

The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and

adjacent routers on IP networks to establish multicast group memberships. IGMP exists in three

backwards compatible versions with IGMPv2 being the most common.

The IGMP message is very simple. It consists of only four things, version, message type, checksum, and

the group, i.e. multicast address, to be joined. There are only three message types: Membership Report,

which doubles as a join message and is sent to the multicast group address; Queries, asking group

members to report if they are still listening which are either sent to the multicast group address or All

Hosts (224.0.0.1); and Leave Group, which is sent when a member wants to stop receiving the multicast

and is sent to All Routers (224.0.0.2)

IGMP has two types of systems sending messages:

Querier: The IGMP Querier is a process that runs on a switch or router. Its responsibility is to

send out IGMP group membership queries on a timed interval, to retrieve IGMP membership

reports from active members, and to allow updating of the group membership tables. There is

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AMX Wireless Touch Panels (Wave Server) Instrukcja Użytkownika Strona 25