D-Link xStack DES-3528 Series Cli Reference Manual page 216

xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch CLI Reference Guide
config mld_snooping querier
Purpose
This command is used to configure the MLD snooping querier.
Syntax 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)
Description This command configures 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.
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 - (Optional) 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 - (Optional) 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 - (Optional) 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.
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
packet received by the interface has a version higher than the specified version, this packet
will be dropped.
•
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.
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