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QoS Design Principles and Best Practices

Chapter Description

In this sample chapter from Designing for Cisco Network Service Architectures (ARCH) Foundation Learning Guide: CCDP ARCH 300-320, 4th Edition, the authors cover some best practice QoS design principles and QoS strategy models that are used to implement the numerous QoS tools we have at our disposal. Remember that usually, more than one solution fits the given QoS requirements, so simplifying the models leveraged can significantly accelerate and ensure proper QoS deployment.


  • Use QoS policies in hardware rather than in software whenever possible.

  • Classify, mark, and police applications as close to the source as possible.

  • Use DSCP marking whenever possible.

  • Define a queue for the traffic class and enable queuing on each node that has potential congestion.

  • Limit the strict-priority queue to one-third of the link bandwidth.

  • Do not use WRED for priority or scavenger traffic classes.

  • Use one of the three QoS strategy models to govern end-to-end QoS design.

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