The Maximum Burst Size (MBS) parameter specifies the maximum queue depth to which a queue can grow. This parameter ensures that a customer that is massively or continuously over-subscribing the PIR of a queue does not consume all the available buffer resources. For high-priority forwarding class service queues, the MBS can be relatively smaller than the other forwarding class queues because the high-priority service packets are scheduled with priority over other service forwarding classes.
The MBS is provisioned on ingress and egress service queues within service ingress QoS policies and service egress QoS policies, respectively. The MBS for a service queue is specified in bytes or kbytes.
The MBSs for network queues are defined within network queue policies based on the forwarding class. The MBSs for the queues for the forwarding class are defined as a percentage of buffer space for the pool.