Netgear M4200-10MG-PoE+ (GSM4210P) - Multigigabit Managed Switch with 8*2.5G and 2x10G SFP+ Layer 3 Administrator's Guide
IGMP Snooping and Querier
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Managed Switches
IGMP Querier Concepts
When the switch is used in network applications where video services such as IPTV, video
streaming, and gaming are deployed, the video traffic is normally flooded to all connected
ports because such traffic packets usually have multicast Ethernet addresses. IGMP
snooping can be enabled to create a multicast group to direct that traffic only to those users
that require it.
streaming, and gaming are deployed, the video traffic is normally flooded to all connected
ports because such traffic packets usually have multicast Ethernet addresses. IGMP
snooping can be enabled to create a multicast group to direct that traffic only to those users
that require it.
However, the IGMP snooping operation usually requires an extra network device—usually a
router—that can generate an IGMP membership query and solicit interested nodes to
respond. With the built-in IGMP querier feature inside the switch, such an external device is
no longer needed.
router—that can generate an IGMP membership query and solicit interested nodes to
respond. With the built-in IGMP querier feature inside the switch, such an external device is
no longer needed.
Figure 30. IGMP querier
Since the IGMP querier is designed to work with IGMP snooping, it is necessary to enable
IGMP snooping when using it. The following figure shows a network application for video
streaming service using the IGMP querier feature.
IGMP snooping when using it. The following figure shows a network application for video
streaming service using the IGMP querier feature.