Modifying IPMS Parameters Configuring IP Multicast Switching
page 24-18 OmniSwitch AOS Release 7 Network Configuration Guide June 2013
Enabling and Disabling IGMP Querying
By default, IGMP querying is disabled.The following subsections describe how to enable and disable
IGMP querying by using the ip multicast querying command.
Enabling the IGMP Querying
You can enable the IGMP querying by entering ip multicast querying followed by the enable keyword.
For example, to enable the IGMP querying on the system if no VLAN is specified, you would enter:
-> ip multicast querying enable
You can also enable the IGMP querying on the specified VLAN by entering:
-> ip multicast vlan 2 querying enable
Disabling the IGMP Querying
You can disable the IGMP querying by entering ip multicast querying followed by the disable keyword.
For example, to disable the IGMP querying on the system if no VLAN is specified, you would enter:
-> ip multicast querying disable
Or, as an alternative, enter:
-> ip multicast querying
To restore the IGMP querying to its default setting.
You can also disable the IGMP querying on the specified VLAN by entering:
-> ip multicast vlan 2 querying disable
Or, as an alternative, enter:
-> ip multicast vlan 2 querying
To restore the IGMP querying to its default setting.
You can remove an IGMP querying entry on the specified VLAN and return to its default behavior by
entering:
-> no ip multicast vlan 2 querying
Modifying the IGMP Robustness Variable
The default value of the IGMP robustness variable (i.e., the variable that allows fine-tuning on a network,
where the expected packet loss is higher) is 2. The following subsections describe how to set the value of
the robustness variable and restore it with the ip multicast robustness command.
Configuring the IGMP Robustness variable
You can modify the IGMP robustness variable from 1 to 7 on the system if no VLAN is specified, by
entering ip multicast robustness followed by the new value. For example, to set the value of IGMP
robustness to 3 you would enter:
-> ip multicast robustness 3
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