Line Rate - 3Com 4510G Configuration Manual

Figure 4-3 GTS application
You can perform traffic shaping for the packets on the outgoing interface of Switch A to avoid
unnecessary packet loss. Packets exceeding the limit are cached in Switch A. Once resources are
released, traffic shaping takes out the cached packets and sends them out. In this way, all the traffic
sent to Switch B conforms to the traffic specification defined in Switch B.

Line Rate

Line rate supports rate-limiting traffic in the outbound direction.
The line rate of a physical interface specifies the maximum rate for forwarding packets (including
critical packets).
Line rate also 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 4-4 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
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