Configuring IP Multicast Switching Modifying IPMS Parameters
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 25-21
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 or SPB service 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
You can also modify the IGMP robustness variable from 1 to 7 on the specified VLAN or SPB service by
entering:
-> ip multicast vlan 2 robustness 3
-> ip multicast service 10 robustness 3
Restoring the IGMP Robustness Variable
You can restore the IGMP robustness variable to its default value on the system if no VLAN or SPB
service is specified, by entering ip multicast robustness followed by the value 0 as shown below:
-> ip multicast robustness 0
Or, as an alternative, enter the following command to restore the IGMP robustness to its default value:
-> no ip multicast robustness
You can also restore the IGMP robustness variable to its default value on the specified VLAN or SPB
service by entering ip multicast robustness followed by the value 0 as shown below:
-> ip multicast vlan 2 robustness 0
-> ip multicast service 10 robustness 0
Or, as an alternative, enter the following commands To restore the IGMP robustness to its default value:
-> no ip multicast vlan 2 robustness
-> no ip multicast service 10 robustness
Note. If the links are known to be lossy, then the robustness variable can be set to a higher value (7).
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