CoS & QoS Defined

• Class of Service:

  • Traffic prioritization
  • Small number of individual classes

• Quality of Service:

  • Parameters or attributes that describe a service
    • Bandwidth Reservation
    • End-to-end delay
    • Delay variation (jitter)
    • Error rate
    • Traffic loss

• Examples

  • IEEE-802.1p (CoS)
  • IETF RSVP (QoS)
  • ATM Traffic Management

CoS/QoS categorizes traffic to ensure that critical traffic will always flow, despite B/W demands of less important applications.

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