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PCE WG , IETF 86th draft-zhang-pce-hierarchy-extensions-03

Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE). PCE WG , IETF 86th draft-zhang-pce-hierarchy-extensions-03. F. Zhang (Huawei) Q. Zhao (Huawei) O. González de Dios (Telefonica I+D)

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PCE WG , IETF 86th draft-zhang-pce-hierarchy-extensions-03

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  1. Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE) PCEWG, IETF 86th draft-zhang-pce-hierarchy-extensions-03 F. Zhang (Huawei) Q. Zhao (Huawei) O. González de Dios (Telefonica I+D) R. Casellas (CTTC) D. King(Old Dog Consulting)

  2. Differences from -02 • Restructuration and rewriting of document. • Editorial changes: • Section on Extensions. • Component (e.g. Open Object). • Protocol Structure (encoding, Flags, TLVs) • Procedure (specific to this component). • Section on H-PCE procedures (general for H-PCE). • Section on Error Handling • Scope of document revisited. • Functions out of scope removed. • NO-PATH new reasons added.

  3. Scope of the document • The scope of the extensions has been clarified. • Functions out of scope of the document: • Finding end point addresses; • Parent Traffic Engineering Database (TED) methods; • Domain connectivity; • All extensions aimed at implementing those functions have been removed from this document. • Inter-domain Node TLV, Inter-domain Link TLV, Reachability TLV, Destination Domain Query.

  4. H-PCE procedures • Two H-PCE procedures are defined in the document: • OPEN Procedure between Child PCE and Parent PCE • Procedure to obtain Domain Sequence

  5. New NO-PATH reasons • NO-PATH object can be used to communicate the reason(s) for not being able to find a multi- domain path or domain sequence • Three new bit flags are defined to be carried in the Flags field in the NO-PATH-VECTOR TLV carried in the NO-PATH Object: • Destination domain unknown • Un-responsive child PCE(s) • No available resources in one or more domain(s)

  6. OPEN points • OF/Metrics • Need to qualify what applies to end-to-end segment • Additional OF codes needed? • Error codes and handling • Additional information (e.g. non-responding PCE)? • Management, Policy & Security

  7. Next Steps • Receive feedback! • This solution document could be adopted as WG document for a solution of the framework document.

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