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PHB (Per-Hop Behavior)

10/28/2011 By Andrew Roderos Leave a Comment

According to End-To-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs book, there are four available standard PHBs (Per-Hop Behavior) and are listed below:

  • Expedited Forwarding (EF) – Provides a strict-priority service. This is similar to the Express Mail service of USPS.
  • Assured Forwarding (AF) – Provides a qualified delivery guaranteee and makes the provision for oversubscription to this service (specifically, markdown and dropping schemes for excess traffic). This is similar to Registered Mail service of USPS.
  • Class Selectors (CS) – Provides code points that can be used for backward compatibility with IP Precedence models.
  • Default PHB (Best-Effort Service) – Provides a “delivery when possible” or best effort service. This is similar to Regular Mail service of USPS.

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Reference

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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