The Committed Burst Size (CBS) parameter specifies the size of buffer that can be drawn from the reserved buffer portion of the queue buffer pool. When the reserved buffers for a specific queue have been used, the queue competes with other queues for additional buffer resources up to the MBS.
The CBS is provisioned on ingress and egress service queues within service ingress QoS policies and service egress QoS policies, respectively. The CBS for a queue is specified in kbytes.
The CBS for a network queue is defined within network queue policies based on the forwarding class. The CBS for the queue for the forwarding class is defined as a percentage of buffer space for the pool.