Alcatel-Lucent 6850-48 Network Guide

Modifying IPMS Parameters

Configuring IP Multicast Switching

page 42-18

OmniSwitch AOS Release 6 Network Configuration Guide

By default, IGMP querying is disabled.The following subsections describe how to enable and disable 
IGMP querying by using the 

command.

You can enable the IGMP querying by entering 

 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

You can disable the IGMP querying by entering 

 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 (i.e., disabled).

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 (i.e., disabled).

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

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 

command.

You can modify the IGMP robustness variable from 1 to 7 on the system if no VLAN is specified, by 
entering 

 followed by the new value. For example, to set the value of IGMP 

robustness to 3 you would enter:

-> ip multicast robustness 3