This read-create Integer32 (0 to 0x7fffffff) sets the Committed Burst Size for a QoS metering profile, the number of bytes of traffic at the committed rate that can burst through before being marked down. An admin tunes this to allow short traffic spikes from a customer to pass as in-profile rather than immediately being flagged as excess. Raising CBS from a small default to a larger value would let a bursty video-conferencing flow pass without being marked yellow during brief spikes.