hwCBQoSQueueCbs 1.3.6.1.4.1.43.45.1.5.25.32.1.1.2.6.1.6

Committed Burst Size. Unit: byte. Only valid for EF queue. Default:min( Bandwidth*25 , 2000000) -1 is returned only when getting value about AF or WFQ queue. -1 can't be set.