config igmp_snooping querier
Purpose Used to configure the time in seconds between general query transmissions, the
maximum time in seconds to wait for reports from members and the permitted packet loss
that guarantees IGMP snooping.
Syntax
config igmp_snooping querier [ vlan_name <vlan_name 32> |all] {query_interval
<sec 1-65535> | max_response_time <sec 1-25> | robustness_variable <value 1-255>
|last_member_query_interval <sec 1-25> | state [enable|disable] }(1)
Description
The config igmp_snooping querier command configures IGMP snooping querier.
Parameters
<vlan_name 32> – The name of the VLAN for which IGMP snooping querier is to be
configured.
query_interval <sec 1-25> − Specifies the amount of time in seconds between general
query transmissions. the default setting is 125 seconds.
max_response_time − 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:
• 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).
• 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).
• 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.
• By default, the robustness variable is set to 2. You might want to increase this value if
you expect a subnet to be lossy.
last_member_query_interval − 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.
state − If the state is enable, it allows the switch to be selected as a IGMP Querier (sends
IGMP query packets). It the state is disabled, then the switch can not play the role as a
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