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24 Description of IGMP Snooping and MLD Snooping
monitored because no response is received from recipient hosts. This functionality enables
the IGMP snooping functionality even when no multicast routers exist in the VLAN. The
Switch sends an IGMP Query message every 125 seconds.
In order to use the IGMP querier functionality, an IP address must be set for VLANs using
the IGMP snooping functionality.
When devices sending IGMP Query messages exist in a VLAN, the IGMP Query message
transmission source with the lowest IP address becomes the representative querier, and it
sends IGMP Query messages. If another device in the VLAN is the representative querier,
the Switch stops using the IGMP querier functionality to send Query messages.
If the representative querier stops, such as due to a malfunction, a new representative
querier is chosen. When the Switch is determined to be the representative querier, such as
due to a malfunction on another device in the VLAN, IGMP Query message transmission is
started. The monitoring time for representative queriers on the Switch is 255 seconds.
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