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Overlay Networks - Path Computation Approaches draft-bardalai-ccamp-overlay-path-comp-02

Overlay Networks - Path Computation Approaches draft-bardalai-ccamp-overlay-path-comp-02. Snigdho Bardalai Khuzema Pithewan Rajan Rao IETF-88, Vancouver. Problem Statement. Overlay networks don’t have visibility to server network topology to perform E2E TE path computation

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Overlay Networks - Path Computation Approaches draft-bardalai-ccamp-overlay-path-comp-02

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  1. Overlay Networks - Path Computation Approachesdraft-bardalai-ccamp-overlay-path-comp-02 Snigdho Bardalai Khuzema Pithewan Rajan Rao IETF-88, Vancouver

  2. Problem Statement • Overlay networks don’t have visibility to server network topology to perform E2E TE path computation • Existing solutions are signaling based • RFC 4208 – server/core node selects the path • RFC 4874 – additional constraints in signaling • Existing solutions do not specify how the overlay network node (CE) determines the route/path to the destination

  3. Applicable use cases • Use Case #1: • Layer transition at server network edge • Use Case#2: • Layer transition within server network

  4. UC#1:Layer transition at server network edge (PE) Layer transition at server edge node (PE) CEs do not know which PE to select to get across provider network

  5. UC#2:Layer transition within server network (P) Layer transition in a core node (P) CEs do not know which PE to select to get across provider network

  6. So, the requirements • Need virtual / abstract topology to represent and contain the server network, irrespective of where the layer transition occurs. • This allows the CE nodes to select route or path to the destination. • Need to be able to establish the virtual /abstract topology that meets the constraints set by the customer network requirements.

  7. What is covered in the draft Path computation approaches using existing methods: • PCE approach (RFC 4655) • Virtual topology approach • Hybrid approach • virtual topology and PCE combined

  8. Comments? Thank You

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