• Why did IntServ fail
  • Differentiated Services (Diffserv)
  • Diffserv Architecture
    		•

    Cs 552 Computer Networks Quality Of Service




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    Recap of RSVP

    Why did IntServ fail?

    • Economic factors
      • Deployment cost vs Benefit
    • Is reservation, the right approach?
      • Multicast centric view
    • Is per-flow state maintenance an issue?
    • More about QoS in general …

    What is the Problem?

    • Goal: provide support for wide variety of applications:
      • Interactive TV, IP telephony, on-line gamming (distributed simulations), VPNs, etc
    • Problem:

    Differentiated Services (Diffserv)

    Diffserv Architecture

    • Ingress routers
      • Police/shape traffic
      • Set Differentiated Service Code Point (DSCP) in Diffserv (DS) field
    • Core routers
      • Implement Per Hop Behavior (PHB) for each DSCP
      • Process packets based on DSCP
    • Ingress
    • Egress
    • Ingress
    • Egress
    • DS-1
    • DS-2
    • Edge router
    • Core router

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    Cs 552 Computer Networks Quality Of Service

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