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Modifying IPMS Parameters Configuring IP Multicast Switching

page 28-16 OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006

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 (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).

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

Note. If the links are known to be lossy, then robustness variable can be set to a higher value (7).

You can also modify the IGMP robustness variable from 1 to 7 on the specified VLAN by entering:

-> ip multicast vlan 2 robustness 3

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