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Configuration Guide - QoS

CloudEngine 12800 and 12800E V200R003C00

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, and ACL-based simplified traffic policy.
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(Optional) Configuring the Data Buffer

(Optional) Configuring the Data Buffer

Context

The data buffer caches packets to be sent from an interface to prevent packet loss upon traffic bursts. When the data buffer is full, the device does not cache packets and directly discards packets not entering the buffer. You can adjust the buffering capacity of interface queues to improve the forwarding performance.

For the CE12800, the burst traffic buffer mode and queue length of an interface can be configured.

For the CE12800E, the burst traffic buffer mode can be configured either in the system view or interface view.

Procedure

  • (For CE12800) Configure a burst traffic buffer mode on the device.
    1. Run system-view

      The system view is displayed.

    2. Run qos burst-mode { enhanced | low-latency }

      A burst traffic buffer mode is configured on the device.

      By default, the switch uses the standard mode.

      NOTE:
      If this command and the qos queue length command are both configured, the qos queue length command takes effect.

    3. Run commit

      The configuration is committed.

  • (For CE12800E) Configure a burst traffic buffer mode on the device.
    1. Run system-view

      The system view is displayed.

    2. Run qos burst-mode enhanced

      A burst traffic buffer mode is configured on the device.

      By default, the switch uses the standard mode.

      NOTE:
      If this command and the qos queue length command are both configured, the qos queue length command takes effect.

    3. Run commit

      The configuration is committed.

  • (For CE12800Eiyou ) Configure a burst traffic buffer mode on an interface.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run qos burst-mode enhanced

      A burst traffic buffer mode is configured on the interface.

      By default, interfaces use the standard mode.

    4. Run commit

      The configuration is committed.

  • (For CE12800 switches) Configure queue lengths on an interface.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run qos queue queue-index length length-value

      The length of a queue is set.

      By default, the system manages the priority queue length of each interface.

      NOTE:

      If this command and the qos burst-mode (system view) command are both configured, the qos burst-mode (system view) command does not take effect.

    4. Run commit

      The configuration is committed.

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Updated: 2019-05-05

Document ID: EDOC1100004202

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