The messages sent from the host, such as IGMP Report, and IGMP Leave will be forwarded
from this port to the router. Only the IGMP Query messages received from this port will be
deemed as legal messages, and forwarded to the host port. The IGMP Query messages
received from non-router interface will be discarded. How to configure route connection, see
the Configuring Router Interface section.
Notethat in some network environments, if no multicast router exists in the network, it is
unnecessary to configure the router interface, and the IGMP snooping can still operate
normally, as shown below. as shown in the following diagram:
Figure 15-3
In this network environment, there is no multicast router, and these four PC can be both
senders and receivers of the multicast flow. At this moment, the switch among them actually
satisfies the requirement only by enabling the IGMP snooping, without having to set any port
as the router interface.
In addition, the router interface defaults to become the receiver of the multicast data within
this VLAN, as shown below.
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