The value of msapIgmpSnpgMcacLagLevel specifies the level
id to use when the value of msapIgmpSnpgMcacLagPortsDown
matches the actual number of ports down in a lag.
Using the value of msapIgmpSnpgMcacLagLevel as an index,
the operational MSAP unconstrained bandwidth will be set
to msapIgmpSnpgMcacLevelBW.
By default, for all lag constraints the link level will
be set to 1 at row creation.