H3C Technologies H3C S10500 Series Switches - Manual (Page 45)

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Line rate
NOTE:
Line rate supports rate-limiting the outbound traffic.
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 handled by the token bucket at line rate. If enough tokens are 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 12 Line rate implementation
The token bucket mechanism limits traffic rate when accommodating bursts. It allows bursty traffic to be
transmitted if enough tokens are available. If tokens are scarce, packets cannot be transmitted until
efficient tokens are generated in the token bucket. It restricts the traffic rate to the rate for generating
tokens.
Line rate can only limit traffic rate on a physical interface, and traffic policing can limit the rate of a flow
on an interface. To limit the rate of all the packets on interfaces, using line rate is easier.
Configuring traffic policing
Follow these steps to configure traffic policing:
To do… Use the command… Remarks
Enter system view system-view —
Create a class and enter class
view traffic classifier tcl-name [ operator { and |
or } ]
—
Configure match criteria if-match match-criteria —
Return to system view quit —