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xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch CLI Reference Guide
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<vlanid_list> - Specify the VLAN ID list.
all - Specify to configure all VLANs and VLAN IDs.
query_interval - Specify the amount of time in seconds between general query transmissions.
<sec 1-65535> - Specify the amount of time in seconds between general query transmissions.
The default setting is 125 seconds.
max_response_time - Specify the maximum time in seconds to wait for reports from members.
<sec 1-25> - Specify the maximum time in seconds to wait for reports from members. The
default setting is 10 seconds.
robustness_variable - Provides fine-tuning to allow for expected packet loss on a subnet. The
value of the robustness variable is used in calculating the following IGMP message intervals:
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.
<value 1-7> - Specify the value between 1 and 7. Increase the value if you expect a subnet to
be lossy. The robustness variable is set to 2 by default.
last_member_query_interval - Specify 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.
<sec 1-25> - Specify the time between 1 and 25 seconds.
state - If the state is enable, it allows the switch to be selected as a IGMP Querier (sends IGMP
query packets). If the state is disabled, then the switch can not play the role as a querier. Note
that if the Layer 3 router connected to the switch provides 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 also send the multicast-routing protocol packet, the port will be timed
out as a router port.
enable - Allows the switch to be selected as an IGMP Querier (sends IGMP query packets).
disable - When disabled, the switch can not play the role as a querier.
version - Specify the version of IGMP packet that will be sent by this port. If a IGMP packet
received by the interface has a version higher than the specified version, this packet will be
forward from the router's ports or VLAN flooding.
<value 1-3> - Specify the values between 1 and 3.
Restrictions
Only Administrator, Operator and Power-User level users can issue this command.
Example
To configure the IGMP snooping querier:
DGS-3420-28SC:admin#config igmp_snooping querier vlan_name default
query_interval 125 state enable
Command: config igmp_snooping querier vlan_name default query_interval 125
state enable
Success.