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S12700 V200R012C00 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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(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.

NOTE:

In enhanced mode, the qos burst-mode (interface view) and qos burst-mode (system view) commands cannot be used together, and the two commands cannot be used with the qos queue length command.

Procedure

  • Configure a burst traffic buffering 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 | extreme }

      A burst traffic buffering mode is configured on the interface.

      The enhanced mode is recommended because the extreme mode may affect forwarding on other interfaces.

      NOTE:

      SA and X1E series cards do not support this command.

  • Configure a burst traffic buffering mode on a card.
    1. Run system-view

      The system view is displayed.

    2. Run qos burst-mode { enhanced | extreme } slot slot-id

      A burst traffic buffering mode is configured on a card.

      The enhanced mode is recommended because the extreme mode may affect forwarding on other interfaces.

      NOTE:

      SA and X1E series cards do not support this command.

  • 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 shutdown

      The interface is shut down.

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

      The length of a queue is set.

      NOTE:

      X series cards do not support this command.

      The ET1D2L02QSC0 and ET1D2C02FEE0 cards do not support change of queue lengths. These cards support the maximum queue length by default.

    5. Run undo shutdown

      The interface is started.

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Updated: 2019-01-18

Document ID: EDOC1100038410

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