D-Link DXS-1210-12TC Reference Manual page 154

This command is only available for VLAN interface configuration. The query version number setting
will affect the querier electing. When configured to version 1, IGMP snooping will always act as the
querier, and will not initiate new querier electing no matter what IGMP query packet is received. When
configured to version 2 or version 3, IGMP snooping will initiate a new querier electing if any IGMPv2
or IGMPv3 query packet is received. When receiving an IGMPv1 query packet, IGMP snooping will
not initiate a new querier electing.
Example
This example shows how to configure the query version to be 2 on VLAN 1000.
Switch# configure terminal
Switch(config)#vlan 1000
Switch(config-vlan)# ip igmp snooping query-version 2
Switch(config-vlan)#
20-10
This command is used to set the robustness variable used in IGMP snooping. Use the no form of this
command to revert to the default value.
ip igmp snooping robustness-variable VALUE
no ip igmp snooping robustness-variable
Parameters
VALUE
Default
By default, this value is 2.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
This 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 IGMP message intervals:
•
•
•
Users 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.
DXS-1210 Series Smart Managed Switch CLI Reference Guide
ip igmp snooping robustness-variable
Specifies the robustness variable. The range is from 1 to 7.
Group member interval – The 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 – The 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 – The 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.
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