HP 830 Series Configuration Manual page 486

Poe+ unified wired-wlan switch switching engine web-based
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Figure 483 Evaluate traffic with the token bucket
The evaluation for the traffic specification is based on whether the number of tokens in the bucket can
meet the needs of packet forwarding. If the number of tokens in the bucket is enough to forward the
packets (typically, one token is associated with a 1-bit forwarding authority), the traffic conforms to the
specification, and the traffic is called "conforming traffic." Otherwise, the traffic does not conform to the
specification, and the traffic is called "excess traffic."
A token bucket has the following configurable parameters:
Mean rate—Rate at which tokens are put into the bucket, or the permitted average rate of traffic. It
is typically set to the committed information rate (CIR).
Burst size—The capacity of the token bucket, or the maximum traffic size permitted in each burst. It
is typically set to the committed burst size (CBS). The set burst size must be greater than the
maximum packet size.
One evaluation is performed on each arriving packet. In each evaluation, if the number of tokens in the
bucket is enough, the traffic conforms to the specification and the tokens for forwarding the packet are
taken away. If the number of tokens in the bucket is not enough, it means that too many tokens have been
used and the traffic is excessive.
Rate limit implementation
With rate limit configured on an interface, all packets to be sent through the interface are first handled
by the token bucket for rate limiting. If the token bucket has enough tokens, packets can be forwarded.
Otherwise, packets are put into QoS queues for congestion management, and traffic passing the
physical interface is controlled.
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