Committed Burst Size. Unit: byte.
Only valid for EF queue.
Default: If the value of 'h3cCBQoSQueueBandwidthValue * 25' is
between 1500 and 2000000, the default value of this
object is 'h3cCBQoSQueueBandwidthValue * 25';If the value of
'h3cCBQoSQueueBandwidthValue * 25' is larger than or equal to
2000000, the default value of this object is 2000000;
If the value of 'h3cCBQoSQueueBandwidthValue * 25' is
less than or equal to 1500, the default value of this object is 1500.
2147483647 is returned only when getting value about AF or WFQ queue.
2147483647 can't be set.