D-Link xStack DGS-3120 Series Cli Reference Manual page 638

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xStack DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch CLI Reference Guide
63-2 config mld_snooping querier
Description
This command is used to configure the timer in seconds between general query transmissions, the
maximum time in seconds to wait for reports from listeners, and the permitted packet loss that is
guaranteed by MLD snooping.
Format
config mld_snooping querier [vlan_name <vlan_name 32> | vlanid <vlanid_list> | all]
{query_interval <sec 1-65535> | max_response_time <sec 1-25> | robustness_variable
<value 1-7> | last_listener_query_interval <sec 1-25> | state [enable | disable] | version
<value 1-2>}(1)
Parameters
vlan_name - Specify the name of the VLAN for which MLD snooping querier is to be configured.
<vlan_name 32> - Enter the VLAN name here. The VLAN name can be up to 32 characters
long.
vlanid - Specify the ID of the VLAN for which MLD snooping querier is to be configured.
<vlanid_list> - Enter the VLAN ID list here.
all - Specify all VLANs for which MLD snooping querier is to be configured.
query_interval - Specify the amount of time in seconds between general query transmissions.
The default setting is 125 seconds.
<sec 1-65535> - Enter the query interval value here. This value must be between 1 and
65535 seconds.
max_reponse_time - Specify the maximum time in seconds to wait for reports from listeners.
The default setting is 10 seconds.
<sec 1-25> - Enter the maximum response time value here. This value must be between 1
and 25 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 MLD message intervals:
<value 1-7> - Enter the robustness variable value here. This value must be between 1 and 7.
•
Group listener interval—Amount of time that must pass before a multicast router decides
there are no more listeners of a group on a network. This interval is calculated as follows:
(robustness variable * query interval) + (1 * 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 * query interval) + (0.5 * query response
interval).
•
Last listener query count—Number of group-specific queries sent before the router
assumes there are no local listeners 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 loosely.
last_listener_query_interval - (Optional) Specify the maximum amount of time between group-
specific query messages, including those sent in response to done-group messages. You
might lower this interval to reduce the amount of time it takes a router to detect the loss of the
last listener of a group.
<sec 1-25> - Enter the last listener query interval value here. This value must be between 1
and 25 seconds.
state - (Optional) This allows the Switch to be specified as an MLD Querier (sends MLD query
packets) or a Non-Querier (does not send MLD query packets). Set to enable or disable.
enable - Enter enable to enable the MLD querier state here.
disable - Enter disable to disable the MLD querier state here.
version - (Optional) Specify the version of MLD packet that will be sent by this port. If a MLD
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