User manual

C HAPTER 4 | Configuring the Switch
MLD Snooping
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◆ 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 Listener Query Interval (RFC 3810 – MLDv2 for IP) 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 MLD 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 MLD 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 MLD snooping proxy reporting is
enabled (see page 152).
◆ URI - The Unsolicited Report Interval specifies how often the upstream
interface should transmit unsolicited MLD reports when report
suppression/proxy reporting is enabled. (Range: 0-31744 seconds,
Default: 1 second)
WEB INTERFACE
To configure VLAN settings for MLD snooping and query:
1. Click Configuration, IPMC, MLD Snooping, VLAN Configuration.
2. Adjust the MLD settings as required.
3. Click Save.
Figure 60: Configuring VLAN Settings for MLD Snooping and Query