3Com S7906E - Switch, Configuration Manual

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4-4
Figure 4-2 Schematic diagram for GTS
For example, in Figure 4-3 , Switch A sends packets to Switch B. Switch B performs traffic policing on
packets from Switch A and drops packets exceeding the limit.
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.