4605-l8 - Quality of Service 1 Puzzle Which direction is...

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1 Quality of Service
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2 Puzzle Which direction is white playing? (use only rules of chess – no strategy required)
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3 Elements of QoS Flow specifications Routing Reservations Admission control Packet scheduling
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4 Specifications and Buckets Leaky Bucket r Token Bucket r B
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5 QoS Routing Determine a path through a network that can satisfy requirements Bandwidth a min-parameter => determining any one path simple Shortest widest vs. Widest shortest Delay an additive-parameter => cost based routing
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6 RSVP: Resource Reservation Protocol Signaling protocol used to convey specifications of flow and desired quality of service Token bucket specification used in both Tspec (flow characteristics) and Rspec (desired QoS characteristics)
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7 Can a router accommodate the new incoming request without violating service to existing flows it serves? If yes, admit and appropriately configure scheduling algorithm If not, reject
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8 Recap Quality of Service Integrated Services Guaranteed Controlled Best-effort Traffic shaping/policing with buckets
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9 Integrated Services Disadvantages Per-flow state and processing at every router in the network Not scalable with increasing number of flows (in transit routers) and line-speeds
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10 Differentiated Services Architecture Goal: To provide quality of service while ensuring scalability with increasing number of flows and line-speeds Approach: Have aggregate behaviors at the core with any per-flow state maintenance and processing done at the edges
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11 Diffserv Approach Other autonomous domains Other autonomous domains Edge Router:  Per-flow state and processing Core Router:  Forwarding based on PHBs  No Per-flow state and processing Bandwidth Broker  Admission control
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12 Diffserv Service Classes Premium Service Assured Forwarding Service Best effort Service
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13 Diffserv Classes - Premium Strict admission control Can still experience delays if a router has multiple incoming links Policing and Shaping done at the ingress points Similar to controlled-load service with no bursts
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Diffserv Classes – Assured Forwarding Loose admission control More efficient Delays and drops possible during congestion
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This note was uploaded on 10/12/2011 for the course ECE 4605 taught by Professor Staff during the Fall '08 term at Georgia Institute of Technology.

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4605-l8 - Quality of Service 1 Puzzle Which direction is...

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