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draft-zhang-pce-hierarchy-extensions-01.txt

Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE ). draft-zhang-pce-hierarchy-extensions-01.txt. Fatai Zhang (Huawei ) Quentin Zhao (Huawei) Óscar González de Dios ( Telefonica ) R amón Casellas (CTTC)

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draft-zhang-pce-hierarchy-extensions-01.txt

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  1. Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE) draft-zhang-pce-hierarchy-extensions-01.txt Fatai Zhang (Huawei) Quentin Zhao (Huawei) Óscar González de Dios (Telefonica) RamónCasellas (CTTC) Daniel King (Old Dog Consulting)

  2. Updates from -00 version • Minor changes • Added ditor’s notes with the open points and suggestions • Added section on Building of parent topology

  3. OPEN issues • Parent PCE TED management • Framework document relies on basic domain connectivity, precluding TE aggregation mechanisms. • Options: should be a decision of the network operator to decide the level of information exchange allowed. • It will depend on the actual scenario (e.g. multi-area WSON vs Inter-AS/carriers) • Do we decouple Hierarchical TED management? • Alternative approaches: • (Dhruv) suggest to keep the Parent-PCE’s topology graph free of BNs (Boundary Nodes) and inter-AS TE link; it being composed only of neighbor domain adjacency.

  4. OPEN issues • Domain representation • Alignmente with e.g. draft-dhruv on domain sequence • Avoid new encodings for domains which could re-use Route sub-objects • OF codes • New requirements arise regarding OF codes • Consideration of actual OF codes (e.g. minimize domain crossing) and policies affecting them (e.g. do not allow domain re-enter). • specify the OF codes to apply at both levels? • at the parent level and also the child's (i.e. intra-domain level)

  5. OPEN issues • Reachability • Current framework and pcep drafts rely on polling to locate endpoints. (caching is not preculed) • Solutions based on notifications/announcements of endpoint (prefixes) can be considered. • Exclusions • exclusions need to take into account domains.

  6. Next Steps • Discuss the open points (meeting, mailing list) • Update the draft according to the chosen direction

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