This read-only value holds the rate limit, described as the amount of traffic in bytes, in excess of the committed access rate, that will be instantaneously permitted by the rate limit. This sets how large an instantaneous burst above the sustained rate CAR will still let through as conforming, the CAR-feature analog of a burst-size parameter, so raising it lets short traffic spikes pass unpenalized even though the sustained rate itself hasn't changed. A brief burst of traffic on a link with a 1 Mbps committed rate would only conform, rather than being filtered, if this limit value is large enough to absorb that burst size.