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xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
179
config mld_snooping querier
packet loss guaranteed by MLD snooping.
Parameters
vlan <vlan_name 32> − The name of the VLAN for which to configure the MLD querier.
all – Specifies all VLANs are to be configured for the MLD querier.
query_interval <sec 1-65535> - Specifies the amount of time between general query
transmissions. The user may specify a time between 1 and 65535 seconds with a
default setting of 125 seconds.
max_response_time <sec 1-25> - The maximum time to wait for reports from listeners.
The user may specify a time between 1 and 25 seconds with a default setting of 10
seconds.
robustness_variable <value 1-255> - Provides fine-tuning to allow for expected packet
loss on a subnet. The user may choose a value between 1 and 255 with a default
setting of 2. If a subnet is expected to be lossy, the user may wish to increase this
interval.
last_listener_query_interval <sec 1-25> - The maximum amount of time to be set
between group-specific query messages. This interval may be reduced to lower the
amount of time it takes a router to detect the loss of a last listener group. The user may
set this interval between 1 and 25 seconds with a default setting of 1 second.
state [enable | disable] – Enabling the querier state will set the Switch as a MLD
querier and disabling it will set it as a Non-querier. The default setting is enabled.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure the MLD snooping querier:
DGS-3600:4#config mld_snooping querier vlan default query_interval 125 state enable
Command : config mld_snooping querier vlan default query_interval 125 state enable
Success.
DGS-3600:4#
show mld_snooping
Purpose Used to display the current status of the MLD snooping function on the Switch.
Syntax
show mld_snooping {vlan<vlan_name 32}
Description This command allows the user to display the current status of the MLD
snooping function on the Switch.
Parameters
vlan <vlan_name 32> − The name of the VLAN for which to view the MLD
snooping configurations.
If no parameter is specified, the Switch will display all current MLD snooping
NOTE: The robustness variable of the MLD snooping querier is used in creating the
following MLD message intervals:
Group Listener Interval – This is the amount of time that must pass before a multicast
router decides that there are no more listeners present of a group on a network. Calculated
as (robustness variable * query interval ) + (1 * query interval).
Querier Present Interval - This is the amount of time that must pass before a multicast
router decides that there are no other querier devices present. Calculated as (robustness
variable * query interval) + (0.5 * query response interval).
Last Listener Query Count – This is the amount of group-specific queries sent before the
router assumes there are no local listeners in this group. The default value is the value of
the robustness variable.