D-Link DWS-3160-24TC Cli Reference Manual page 340

DWS-3160 Series Gigabit Ethernet Unified Switch CLI Reference Guide
subnet. The value of the robustness variable is used in calculating the following IGMP
message intervals:
<value 1-7> - Enter the robustness variable value here. This value must be between 1 and 7.
By default, the robustness variable is set to 2. You might want to increase this value if you
expect a subnet to be loosely.
1. Group member interval—Amount of time that must pass before a multicast router
decides there are no more members of a group on a network. This interval is
calculated as follows: (robustness variable x query interval) + (1 x query response
interval).
2. Other querier present interval—Amount of time that must pass before a multicast
router decides that there is no longer another multicast router that is the querier. This
interval is calculated as follows: (robustness variable x query interval) + (0.5 x query
response interval).
3. Last member query count—Number of group-specific queries sent before the router
assumes there are no local members of a group. The default number is the value of
the robustness variable.
last_member_query_interval - (Optional) Specifies the maximum amount of time between
group-specific query messages, including those sent in response to leave-group messages.
You might lower this interval to reduce the amount of time it takes a router to detect the loss of
the last member of a group. On receiving a leave message, the router will assume there are
no local members on the interface if there are no reports received after the response time
(which is last member query interval * robustness variable)
<sec 1-25> - Enter the last member query interval value here. This value must be between 1
and 25 seconds.
state - (Optional) If the state is enabled, it allows the Switch to be selected as an IGMP Querier
(sends IGMP query packets). It the state is disabled, then the Switch cannot play the role as a
querier. Note that if the Layer 3 router connected to the Switch provide only the IGMP proxy
function but does not provide the multicast routing function, then this state must be configured
as disabled. Otherwise, if the Layer 3 router is not selected as the querier, it will not send the
IGMP query packet. Since it will not send the multicast-routing protocol packet, the port will be
timed out as a router port.
enable - Enter enable to enable this state.
disable - Enter disable to disable this state.
version - (Optional) Specifies the version of IGMP packet that will be sent by this port. If an
IGMP packet received by the interface has a version higher than the specified version, this
packet will be dropped.
<value 1-3> - Enter the version number here. This value must be between 1 and 3.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
Example
To configure the IGMP snooping querier:
DWS-3160-24PC:admin#config igmp_snooping querier vlanid 2 query_interval 125
state enable
Command: config igmp_snooping querier vlanid 2 query_interval 125 state enable
Success.
DWS-3160-24PC:admin#
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