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Chapter 5: Configuring the Switch through the Web Utility
IGMP
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
IGMP
The Internet Group Management Protocol (IGMP) runs between hosts and their immediately adjacent multicast
router/switch. IGMP is a multicast host registration protocol that allows any host to inform its local router that it
wants to receive transmissions addressed to a specific multicast group.
A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive multicast traffic. If
there is more than one router/switch on the LAN performing IP multicasting, one of these devices is elected
“querier” and assumes the role of querying the LAN for group members. It then propagates the service requests
on to any adjacent multicast switch/router to ensure that it will continue to receive the multicast service.
Based on the group membership information learned from IGMP, a router/switch can determine which (if any)
multicast traffic needs to be forwarded to each of its ports. At Layer 3, multicast routers use this information,
along with a multicast routing protocol such as DVMRP or PIM, to support IP multicasting across the Internet.
Note that IGMP neither alters nor routes IP multicast packets. A multicast routing protocol must be used to deliver
IP multicast packets across different subnetworks.
The IGMP tab includes links to the following screens.
• IGMP Conf
• IGMP Router Info
• IGMP Router Conf
• IP Multicast Reg Table
• IGMP Member Conf