Use the following syntax to enable IGMP.
config>router# igmp
A:7210SAS>>config>router# info detail
...
#------------------------------------------
echo "IGMP Configuration"
#------------------------------------------
igmp
query-interval 125
query-last-member-interval 1
query-response-interval 10
robust-count 2
no shutdown
exit
#------------------------------------------
A:7210SAS>>config>system#