Thar Desert

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Thar Desert
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Thar Wildlife
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Students We Consider

• Sharad Agarwal
• Matthew Caesar
• Yan Chen
• Weidong Cui
• Sridhar Machiraju
• Bhaskar Raman
• Mukund Seshadri
• Lakshminarayanan Subramanian
• No slides
• Suzuki, Ben, Morley, Shelley, Jimmy

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Generic Scenario

• Bob purchases application A from ASP X
• ASP X composes A from services A1, A2, A3
• A1 is provided by multiple SPs A11, A12, A13
• Each SP has multiple instances, A11a, A11b, A11c
• A2 is provided by multiple SPs A21, A22, A23
• A3 is provided by multiple SPs A31, A32, A33
• Later, one of the services, A22, fails
• Later, Bob roams from his wireless ISP W1 to W2

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Generic Scenario

• How does ASP X build application A?
• Is user authentic ? (SUZUKI)
• What composition of services (A1?A2 ?A3) ?
• Which composition path is reliable ? (BHASKAR)
• Does A need multicast ? Set it up across the SPs
  (MUKUND)
• For each service, which SP (A11, A12, or A13) ?
• What composition is allowed by each SPs policies
  ? (SHARAD)
• Which SPs are authentic ? (SUZUKI)
• For each SP, which instance (A11a, A11b, A11c) ?
• How did each SP place instances ? (YAN)
• How does each SP migrate content between
  instances? (YAN)
• How do we allocate usage? (JIMMY, WEIDONG)
• Which telephony gateway to pick ? (MATT)
• Which CDN server to use? (MORLEY)
• Which one has the desired connectivity /
  performance ? (YAN)
• How does each SP maintain good connectivity ?
  (SHARAD)
• How does each SP trust / verify its connectivity
  ? (LAKSHMI)

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Generic Scenario

• Failure occurs, who is to blame?
• A Link in the path fails
• How does each SP maintain good connectivity ?
  (SHARAD)
• How does each SP trust / verify its connectivity
  ? (LAKSHMI)
• Composed path fails
• How does X maintain path redundancy ? (WEIDONG)
• Which paths have orthogonal failure / congestion
  properties ? (YAN)
• Instance A22a fails how to switch over to A22b ?
• A22 fails how to switch over to A23 ?
• Re-compose / re-route path (BHASKAR)
• Transitions
• Access provider switches from W1 to W2
• How do we maintain connectivity with QoS during
  switch ? (SRIDHAR)
• A Link is congested
• How do we allocate usage? (WEIDONG)

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SAHARA Architecture
Applications
End2End Network
IP Network
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SAHARA Architecture

• Composition
• AAA
• Policy Management

Applications
Composition
Services
End2End Network
Enhanced Links
Enhanced Paths

• Verification
• Auction Allocation
• Measurements

IP Network
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Application
AAA
Placement
Composition
Policy Management
Congestion
GW Selection
End2End Network
Measurement
Auction Allocation
InterD Multicast
ABC
Backup Paths
Overlay Networks
Verification
IP Network