This attribute specifies the committed information rate (cir) in bits
per second (bit/s). When rateEnforcement is set to on, cir is the
rate at which the network agrees to transfer information under
normal conditions. This rate is measured over a measurement
interval (t) that is determined internally based on cir and the
committed burst size (bc). An exception to this occurs when cir is
provisioned to be zero, in which case the measurement interval (t)
must be provisioned explicitly.
This attribute is ignored when rateEnforcement is off. If
rateEnforcement is on and this attribute is 0, bc must also be 0.