Igmp Terms - Lenovo RackSwitch G8264 Application Manual

IGMP Terms

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G8264 Application Guide for ENOS 8.4
The following are commonly used IGMP terms:
 Multicast traffic: Flow of data from one source to multiple destinations.
 Group: A multicast stream to which a host can join. Multicast groups have IP
addresses in the range: 224.0.1.0 to 239.255.255.255.
 IGMP Querier: A router or switch in the subnet that generates Membership
Queries.
 IGMP Snooper: A Layer 3 device that forwards multicast traffic only to hosts
that are interested in receiving multicast data. This device can be a router or a
Layer 3 switch.
 Multicast Router: A router configured to make routing decisions for multicast
traffic. The router identifies the type of packet received (unicast or multicast)
and forwards the packet to the intended destination.
 IGMP Proxy: A device that filters Join messages and Leave messages sent
upstream to the Mrouter to reduce the load on the Mrouter.
 Membership Report: A report sent by the host that indicates an interest in
receiving multicast traffic from a multicast group.
 Leave: A message sent by the host when it wants to leave a multicast group.
FastLeave: A process by which the switch stops forwarding multicast traffic to a

port as soon as it receives a Leave message.
 Membership Query: Message sent by the Querier to verify if hosts are listening
to a group.
 General Query: A Membership Query sent to all hosts. The Group address field
for general queries is 0.0.0.0 and the destination address is 224.0.0.1.
 Group‐specific Query: A Membership Query sent to all hosts in a multicast group.