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HAPTER
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| Configuring the Switch
IGMP Snooping
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â—† QRI - The Query Response Interval is the Max Response Time
advertised in periodic General Queries. The QRI applies when the
switch is serving as the querier, and is used to inform other devices of
the maximum time this system waits for a response to general queries.
(Range: 10-31744 tenths of a second; Default: 10 seconds)
◆ LLQI - The Last Member Query Interval (RFC 3810 – MLDv2 for IP) is
used to configure the Last Member Query Interval for IGMP. This
attribute sets the interval to wait for a response to a group-specific or
group-and-source-specific query message. The overall time to wait for
a response (Last Member Query Time) is the value assigned to LLQI,
multiplied by the Last Member Query Count (which is fixed at 2).
(Range: 1-31744 tenths of a second in multiples of 10;
Default: 1 second)
When a multicast host leaves a group, it sends an IGMP leave message.
When the leave message is received by the switch, it checks to see if
this host is the last to leave the group by sending out an IGMP group-
specific or group-and-source-specific query message, and starts a
timer. If no reports are received before the timer expires, the group
record is deleted, and a report is sent to the upstream multicast router.
A reduced value will result in reduced time to detect the loss of the last
member of a group or source, but may generate more burst traffic.
This attribute will take effect only if IGMP snooping proxy reporting is
enabled (see page 140).
â—† URI - The Unsolicited Report Interval specifies how often the upstream
interface should transmit unsolicited IGMP reports when report
suppression/proxy reporting is enabled. (Range: 0-31744 seconds,
Default: 1 second)
WEB INTERFACE
To configure VLAN settings for IGMP snooping and query:
1. Click Configuration, IPMC, IGMP Snooping, VLAN Configuration.
2. Adjust the IGMP settings as required.
3. Click Save.
Figure 52: Configuring VLAN Settings for IGMP Snooping and Query
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