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S12700 V200R013C00 Configuration Guide - QoS

This document describes the configurations of QoS functions, including MQC, priority mapping, traffic policing, traffic shaping, interface-based rate limiting, congestion avoidance, congestion management, packet filtering, redirection, traffic statistics, ACL-based simplified traffic policy, and HQoS.
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Traffic Shaping

Traffic Shaping

Traffic shaping adjusts the rate of outgoing traffic to reduce traffic bursts so that outgoing packets can be transmitted at a stable rate. Traffic shaping uses a buffer and token buckets to control the traffic rate. When packets are sent at a high speed, the system buffers packets and then sends them evenly under the control of the token buckets.


Traffic shaping is a queue-based traffic control mechanism that limits the rate at which packets pass through an interface.

Figure 4-5 shows an example of the traffic shaping process, using flow-based queue shaping in single-rate-single-bucket mode.

Figure 4-5  Traffic shaping process

The traffic shaping process is as follows:

  1. When packets arrive, the system classifies packets and places them into different queues.
  2. If a queue is not configured with traffic shaping, packets placed in this queue are immediately sent. For the queues configured with traffic shaping, the system proceeds to the next step.
  3. The system places tokens in the bucket at the specified rate (CIR):
    • If there are sufficient tokens in the bucket, the system sends the packets and decreases the number of tokens accordingly.
    • If tokens in the bucket are insufficient for packet forwarding, the system places the packets into the buffer queue. If the buffer queue is full, the system discards the packets.
  4. When there are packets in the buffer queue, the system compares the number of packets with the number of tokens in the token bucket. If there are sufficient tokens, the system forwards packets until all the packets in the buffer queue are sent.
Updated: 2019-04-08

Document ID: EDOC1100065653

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