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NE40E V800R010C10SPC500 Configuration Guide - QoS 01

This is NE40E V800R010C10SPC500 Configuration Guide - QoS
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(Optional) Configuring an FQ WRED Object

(Optional) Configuring an FQ WRED Object

You can set the high threshold percentage, low threshold percentage, and drop probability for a flow-wred object. In this case, when the queue length exceeds the threshold, the device randomly discards packets by using the WRED mechanism.

Context

Do as follows on the router:

NOTE:
  • When no flow-wred objects are set, the system adopts the default tail-drop policy.
  • The high and low limit percentages for red packets can be set to the minimum; those for yellow packets can be greater; those for green packets can be set to the maximum.
  • In the actual configuration, the low limit percentage of WRED is recommended to begin with 50% and be adjusted based on different colors of packets. 100% is recommended for the drop probability.

By configuring a flow-wred object, users can set the high limit percentage, low limit percentage, and drop probability for queues.

  • When the percentage of the actual length of a queue over the length of a FQ is less than the low limit percentage, the system does not drop packets.
  • When the percentage of the actual length of a queue over the length of a FQ is between the low limit percentage and the high limit percentage, the system drops packets through the WRED mechanism. The longer the queue length, the higher the drop probability.
  • When the percentage of the actual length of a queue over the length of a FQ is greater than the high limit percentage, the system drops all subsequent packets.

You can create multiple flow-wred objects for being referenced by FQs as required. You can configure up to 511 flow-wred objects in the system.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run flow-wred flow-wred-name

    The flow-wred is created and the flow-wred view is displayed.

  3. Run color { green | yellow | red } low-limit low-limit-percentage high-limit high-limit-percentage discard-percentage discard-percentage-value

    The high and low limit percentages and the drop probability are set for different colors of packets.

  4. (Optional) Run queue-depth queue-depth-value

    The depth is set for the FQs in the flow-wred objects to decrease the delay.

  5. Run commit

    The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055024

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