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DAS-3600 Series Ethernet over VDSL Switch CLI Reference Manual
config igmp_snooping querier
Purpose
Used to configure the 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 <vlan_name 32> | vlanid <vidlist> |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] |version
<value 1-3>}
Description
This command is used to configure IGMP snooping querier.
Parameters
vlan_name – The name of the VLAN for which IGMP snooping querier is to be configured.
<vidlist> – The VIDs of the VLAN for which IGMP snooping is to be configured.
query_interval − 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:
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
querier. Note that if the Layer 3 router connected to the switch provide only the IGMP proxy
function but not provide the mutlicast 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.
version – The version of the IGMP Query sent by the switch.
•
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.
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