VDSL/ADSL2+ Dual Band AC1600 Gigabit Gateway with VoIP
Multicast (IGMP Configuration)
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 is a protocol only used on the network between a host and the
router. It allows a host to inform the router whenever that host needs to join or leave a particular multicast group. IGMP
provides for more efficient allocation of resources when used with online gaming and video streaming.
Figure 91 – Multicast
The version IGMP in use by the router.
The hosts on the segment report their group membership in response to the
router’s queries. The query interval timer is also used to define the amount of time
a router will store particular IGMP state if it does not hear any reports on the
group. The query interval is the time in seconds between queries sent from the
router to IGMP hosts.
When a host receives the query packet, it starts counting to a random value, less
the maximum response time. When this time expires, the host replies with a report,
provided that no other host has responded yet. This accomplishes two purposes:
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