Configuring Traffic Shaping - Huawei Quidway S3500 Series Operation Manual

Operation Manual - QoS/ACL
Quidway S3500 Series Ethernet Switches
This configuration task is intended for policing the traffic filtered in by the adopted ACL,
i.e., taking actions appropriate to the traffic within and beyond the specified limitation,
dropping packets for example.
For more information about these commands, see Command Manual.

2.4.3 Configuring Traffic Shaping

Traffic shaping is functioning to control packet outputting speed so that packets can be
outputted at an average speed. Normally, it is used for adapting to the packet receiving
speed of the downstream devices in case of unnecessary packet drop and congestion.
Traffic shaping is different from traffic policing in the sense that the former allows packet
transmission at an average speed by buffering the packets beyond the specified rate
limitation whereas the latter limits traffic size by dropping them. Due to the adoption of
different approaches, traffic shaping may cause extra latency while traffic policing does
not.
You may configure traffic shaping using the command in the following table.
Perform the following configuration in Ethernet interface view.
Table 2-34 Configuring traffic shaping
Configure traffic shaping.
Disable traffic shaping.
The switch supports traffic shaping not only on all the traffic but also on the specified
output queues at the port. You can implement those two kinds of traffic shaping by
selecting different parameters. If queue queue-id in the traffic-shape command is not
specified, you can perform traffic shaping on all the traffic at the port. Otherwise, you
can perform traffic shaping on the specified output queue.
Note:
Comply with the following rules when you perform traffic shaping on a queue: the depth
of a single queue must smaller than that of the port.
By default, the queue depth of a port is 256 and the single queue depth should be
smaller than 128.
The default value is recommended.
For more information about the traffic-shape command, see Command Manual.
Operation
Huawei Technologies Proprietary
Command
traffic-shape [ queue queue-id ] max-rate
burst-size [ queue-depth ]
undo traffic-shape [ queue queue-id ]
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Chapter 2 QoS Configuration