On the access side, CBS is configured in bytes and MBS in bytes or kilobytes using the CLI. See, for example, the config>qos>sap-ingress/egress>queue>cbs and mbs configuration commands.
On the network side, CBS and MBS values are expressed as a percentage of the total number of available buffers. If the buffer space is further segregated into pools (for example, ingress and egress, access and network, or a combination of these), the CBS and MBS values are expressed as a percentage of the applicable buffer pool. See the config>qos>network-queue>queue>cbs and mbs configuration commands.
The configured CBS and MBS values are converted to the number of buffers by dividing the CBS or MBS value by a fixed buffer size of 512 bytes or 2304 bytes, depending on the type of adapter card or platform. The number of buffers can be displayed for an adapter card using the show pools command.