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C
15
HAPTER
Layer 2 IGMP (Snooping and Query for IPv4)
Proxy Reporting – Enables IGMP Snooping with Proxy Reporting.
◆
(Default: Based on global setting)
When proxy reporting is enabled with this command, the switch
performs "IGMP Snooping with Proxy Reporting" (as defined in DSL
Forum TR-101, April 2006), including last leave, and query
suppression.
Last leave sends out a proxy query when the last member leaves a
multicast group, and query suppression means that specific queries are
not forwarded from an upstream multicast router to hosts downstream
from this device.
Interface Version – Sets the protocol version for compatibility with
◆
other devices on the network. This is the IGMP Version the switch uses
to send snooping reports. (Range: 1-3; Default: 2)
This attribute configures the IGMP report/query version used by IGMP
snooping. Versions 1 - 3 are all supported, and versions 2 and 3 are
backward compatible, so the switch can operate with other devices,
regardless of the snooping version employed.
Query Interval – The interval between sending IGMP proxy general
◆
queries. (Range: 2-31744 seconds; Default: 125 seconds)
An IGMP general query message is sent by the switch at the interval
specified by this attribute. When this message is received by
downstream hosts, all receivers build an IGMP report for the multicast
groups they have joined.
This attribute applies when the switch is serving as the querier
(page
613), or as a proxy host when IGMP snooping proxy reporting is
enabled
(page
613).
◆
Query Response Interval – The maximum time the system waits for
a response to proxy general queries. (Range: 10-31740 tenths of a
second; Default: 10 seconds)
This attribute applies when the switch is serving as the querier
(page
613), or as a proxy host when IGMP snooping proxy reporting is
enabled
(page
613).
Last Member Query Interval – The interval to wait for a response to
◆
a group-specific or group-and-source-specific query message.
(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
613).
– 624 –
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