D-Link DES-3326S - Page 159

D-Link DES-3326S Layer 3 Switch CLI Reference
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 32>|all] {query_interval
<sec>|max_response_time <sec>|robustness_variable
<value>|last_member_query_interval <sec>|state [enable|disable]
Description This 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> − Specifies the amount of time in seconds between
general query transmissions. The default setting is 125 seconds.
max_response_time <sec> − Specifies the maximum time in seconds to wait
for reports from members. The default setting is 10 seconds.
robustness_variable <value> − 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 <sec> − 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 [enable|disable] − Allows the Switch to be specified as an IGMP Querier
or Non-querier.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure the igmp snooping:
DES-3326S:4#config igmp_snooping querier default query_interval 125 state enable
Command: config igmp_snooping querier default query_interval 125 state enable
Success.
DES-3326S:4#
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