The committed burst size (CBS) parameters specify the amount of buffers that can be drawn from the reserved buffer portion of the queue’s buffer pool. After the reserved buffers for a specific queue are used, the queue contends with other queues for additional buffer resources up to the maximum burst size.
The CBS of the queue is configurable under the different QoS policies, if supported by the platform, that provide the option to configure the queue parameters – example under service ingress and service egress queue policies, network queue policies, and so on The CBS for a queue is specified in kbytes.
The CBS for the queues is user-configurable. By default, software assigns a default value. It can be modified by the user as per their needs. The default value are specified in the command description.