Netgear S3300-28X (GS728TX) - ProSAFE S3300 Smart Switch Series 관리자 가이드

IGMP snooping requires that one central switch or router periodically query all end-devices 
on the network to announce their multicast memberships. This central device is the IGMP 
querier. The IGMP query responses, known as IGMP reports, keep the switch updated with 
the current multicast group membership on a port-by-port basis. If the switch does not 
receive updated membership information in a timely fashion, it will stop forwarding multicasts 
to the port where the end device is located.

These screens enable you to configure and display information on IGMP snooping queriers 
on the network and, separately, on VLANs.

The IGMP Snooping Querier menu contains links described in the following sections.

Use this screen to enable or disable the IGMP snooping querier feature, specify the IP 
address of the router to perform the querying, and configure the related parameters. 

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Select Switching

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Configuration.

Next to the Querier Admin Mode field, enable or disable the administrative mode for IGMP 
snooping querier.

In the Snooping Querier Address field, specify the IP address to be used as source address 
in periodic IGMP queries. 

This address is used when no address is configured on the VLAN on which the query is 
being sent.

In the IGMP Version field, specify the IGMP protocol version used in periodic IGMP queries.

In the Query Interval field, specify the time interval in seconds between periodic queries sent 
by the snooping querier. 

The Query Interval must be a value in the range of 1–1800 seconds. The default value is 
60.

In the Querier Expiry Interval field, specify the time interval in seconds after which the last 
querier information is removed. 

The Querier Expiry Interval must be a value in the range of 60–300 seconds. The default 
value is 125.

Click the Apply button.