H3C Technologies H3C S5120 Series Switches - Manual (Page 361)

4-1
4
Line Rate Configuration
When configuring traffic classification, traffic policing, and traffic shaping, go to these sections for
information you are interested in:
z Line Rate
z Line Rate Configuration
Line Rate
The line rate of a physical interface specifies the maximum rate for forwarding packets (including critical
packets).
Line rate uses token buckets for traffic control. With line rate configured on an interface, all packets to
be sent through the interface are firstly handled by the token bucket at line rate. If there are enough
tokens in the token bucket, packets can be forwarded; otherwise, packets are put into QoS queues for
congestion management. In this way, the traffic passing the physical interface is controlled.
Figure 4-1 Line rate implementation
In the token bucket approach to traffic control, bursty traffic can be transmitted so long as enough
tokens are available in the token bucket; if tokens are inadequate, packets cannot be transmitted until
the required number of tokens are generated in the token bucket. Thus, traffic rate is restricted to the
rate for generating tokens, thus limiting traffic rate and allowing bursty traffic.
Line Rate Configuration
Configuration procedure
The line rate of a physical interface specifies the maximum rate of incoming packets or outgoing
packets.
Follow these steps to configure the line rate: