Overlay networks path computation approaches
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Overlay Networks - Path Computation Approaches. Snigdho Bardalai Khuzema Pithewan Rajan Rao. Problem Statement. To be able to compute TE paths across multiple overlaying (or peering) networks or administrative domains. The objective of the draft is to:

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Overlay networks path computation approaches

Overlay Networks - Path Computation Approaches

Snigdho Bardalai

Khuzema Pithewan

Rajan Rao


Problem statement
Problem Statement

  • To be able to compute TE paths across multiple overlaying (or peering) networks or administrative domains.

  • The objective of the draft is to:

    • Identify the path computation use-cases.

    • Describe different approaches on how this can be achieved.


Use cases
Use-cases

  • Point-to-point paths

  • Diversity

    • Single head and tail end nodes

    • Multiple head and tail end nodes

  • Point to multipoint paths

C

P

C

C

P

C

C

P

C

C

P

C

C


Approaches
Approaches

  • Virtual topology approach

    • Abstract or virtual nodes

    • Abstract or virtual links

  • PCE approach

    • BRPC

    • Hierarchical PCE

      • Top-level parent PCE that operates across multiple administrative domains may not be available.

  • Hybrid approach – virtual topology and PCE

    • Use virtual topology to determine domain entry and exit points.

    • Use PCEP to request for intra-domain paths.


Hybrid approach example
Hybrid Approach Example

  • PE nodes advertises a virtual-node representing the whole provider networkor domain.

  • CE node determines the entry and exit end-points using the virtual topology.

  • CE node then sends a path computation request to the appropriate PCE.

Provider Domain

Provider

Domain-1

VN

Provider

Domain-1

VN

CE

CE

CE

CE

CE

CE


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