OmniSwitch os6900, Network Configuration Manual, Page: 585 / 942

Configuring IP Multicast Switching Modifying IPMS Parameters
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 24-19
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
Restoring the IGMP Robustness Variable
You can restore the IGMP robustness variable to its default value on the system if no vlan is specified, by
entering
ip multicast robustness followed by the value 0 as shown below:
-> ip multicast robustness 0
Or, as an alternative, enter:
-> ip multicast robustness
To restore the IGMP robustness to its default value.
You can also restore the IGMP robustness variable to its default value on the specified VLAN, by entering
ip multicast robustness followed by the value 0 as shown below:
-> ip multicast vlan 2 robustness 0
Or, as an alternative, enter:
-> ip multicast vlan 2 robustness
To restore the IGMP robustness to its default value.
Enabling and Disabling the IGMP Spoofing
By default, IGMP spoofing (i.e., replacing a client's MAC and IP address with the system's MAC and IP
address, when proxying aggregated IGMP group membership information) is disabled on the switch. The
following subsections describe how to enable and disable spoofing by using the
ip multicast spoofing
command.
Enabling the IGMP Spoofing
To enable IGMP spoofing on the system if no VLAN is specified, use the ip multicast spoofing command
as shown below:
-> ip multicast spoofing enable
You can also enable IGMP spoofing on the specified VLAN by entering:
-> ip multicast vlan 2 spoofing enable
Disabling the IGMP Spoofing
To disable IGMP spoofing on the system if no VLAN is specified, use the ip multicast spoofing
command as shown below:
-> ip multicast spoofing disable
Or, as an alternative, enter: