Owners manual

DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide
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When report suppression is enabled, the Switch suppresses the duplicate reports sent by hosts. The
suppression for the same group report or leave will continue until the suppression time expired. For report
or leave messages to the same group, only one report or leave message is forwarded. The remaining
report and leave messages are suppressed.
Example
This example shows how to enable MLD report suppression.
Switch# configure terminal
Switch(config)# vlan 100
Switch(config-vlan)# ipv6 mld snooping report-suppression
Switch(config-vlan)#
45-12 ipv6 mld snooping robustness-variable
This command is used to set the robustness variable used in MLD snooping. Use the no form of this
command to revert to the default value.
ipv6 mld snooping robustness-variable VALUE
no ipv6 mld snooping robustness-variable
Parameters
VALUE
Specifies the robustness variable. The range is from 1 to 7.
Default
By default, this value is 2.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
The command is only available for VLAN interface configuration.
The robustness variable provides fine-tuning to allow for expected packet loss on an interface. The value
of the robustness variable is used in calculating the following MLD 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 listener query count - The 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.
User can increase this value if a subnet is expected to be loose.
Example
This example shows how to configure the robustness variable to be 3 on interface VLAN 1000.