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QoS Requirements of Data and Control Plane

11/05/2011 By Andrew Roderos Leave a Comment

QoS requirements and recommendations for data traffic:

Best Effort

  • Traffic should be marked to DSCP 0.
  • Adequate bandwidth should be assigned to this class because majority of applications default to this class. Recommended is to set aside 25 percent for this class.

Bulk

  • Traffic should be marked to DSCP AF11; excess traffic can be marked down by a policer to AF12 or AF13.
  • Traffic should have a moderate bandwidth guarantee but should be constrained from dominating a link.

Transactional or Interactive

  • Traffic should be marked to DSCP AF21; excess traffic can be marked down by a policer to AF22 or AF23.
  • Traffic should have an adequate bandwidth guarantee for the interactive, foreground operations that it supports.

Mission Critical

  • Traffic should be marked to DSCP AF31; excess traffic can be marked down by a policer to AF32 or AF33.
  • Traffic should have an adequate bandwidth guarantee for the interactive, foreground operations that it supports.

QoS requirements and recommendations for control plane:

Network Management

  • Traffic should be marked to DSCP CS2.
  • Network Management applications should be protected explicitly with a minimal bandwidth guarantee.

Scavenger

  • Traffic should be marked to DSCP CS1.
  • Traffic should be assigned the lowest configurable queuing service; for instance, in Cisco IOS, this means assigning a CBWFQ of 1 percent.

References

Cisco QoS Exam Certification Guide (IP Telephony Self-Study) (2nd Edition)
End-to-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs

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Filed Under: QoS Tagged With: Cisco, IOS

About Andrew Roderos

I am a network security engineer with a passion for networking and security. Follow me on Twitter, LinkedIn, and Instagram.

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