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DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
183
config igmp_snooping querier
Purpose
This command configures IGMP snooping querier.
Syntax
config igmp_snooping querier [vlan <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] | version <value 1-3>}
Description
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.
Parameters
<vlan_name 32>
−
The name of the VLAN for which IGMP snooping querier is
to be configured.
query_interval
<sec 1-65535>
−
Specifies the amount of time in seconds
between general query transmissions. The default setting is
125
seconds.
max_response_time <sec 1-25>
−
Specifies the maximum time in seconds to
wait for reports from members. The default setting is
10
seconds.
robustness_variable <value 1-255>
−
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. Although 1 is
specified as a valid entry, the roubustness variable should not be one or
problems may arise.
last_member_query_interval <sec 1-25>
−
The maximum amount of time
between group-specific query messages, including those sent in response to
leave-group messages. Users may 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.
version <value 1-3>
−
Configure the IGMP version of query packet which will be
sent by router.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example usage:
To configure IGMP snooping querier:
DGS-3627:5#config igmp_snooping querier vlan default query_interval 125
version 3
Command: config igmp_snooping querier vlan default query_interval 125
version 3
Success.
DGS-3627:5#
