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Command Usage
IGMP query can be enabled globally at Layer 2 via the ip igmp
snooping command, or enabled for specific VLAN interfaces at Layer
3 via the ip igmp command. (Layer 2 query is disabled if Layer 3 query
is enabled.)
Example
Related Commands
ip igmp snooping (3-96)
show ip igmp snooping (3-98)

ip igmp robustval

Use this command to specify the robustness (i.e., expected packet loss ) for
this interface. Use the no form of this command to restore the default
value.
Syntax
ip igmp robustval robust-value
no ip igmp robustval
robust-value - The robustness of this interface. (Range: 1-255)
Default Setting
2
Console(config)#interface vlan 1
Console(config-if)#ip igmp
Console(config-if)#end
Console#show ip igmp interface
Vlan 1 is up
IGMP is enable, version is 2
Robustness variable is 2
Query interval is 125 sec
Query Max Response Time is 10 sec, Last Member Query Interval is 1 sec
Querier is 10.1.0.253
Console#