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PCE Database Requirements

This draft expands the scope of PCE Database Requirements, emphasizing LSP DB, PCE Database model for inter-domain interactions, and PCE Database synchronization. It integrates a "Grey-Box" model to handle domain details confidentially. The document presents the need for suitable performance indicators, TE metrics, and synchronization methods to enhance inter-domain cooperation. Potential solutions include BGP-based LSDB distribution and PCEP extensions for stateful PCEs. Your feedback is vital for the -03 version to incorporate GMPLS aspects and best practices for both intra and inter-domain scenarios.

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PCE Database Requirements

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  1. PCE Database Requirements draft-dugeon-pce-ted-reqs-02.txt O. Dugeon, J. Meuric (Orange) R. Douville (Alcatel-Lucent) R. Casellas (CTTC) O.D de Dios (TiD)

  2. Change since version 01 • Enlarge the scope of the draft to PCE Database Requirements • Add LSP DB as part of requirements • LSP knowledge is also required for efficient Global Concurrent Optimization • Add PCE Database model for inter-domain part • Propose a simple model to define what needs to be exchanged • Goal: protocol requirements, not how to compute metrics • Enhance requirements for the PCE Database population • Requirements for PCE Database synchronization between PCE

  3. Inter-domain PCE Database model • Contrary to intra-domain, the PCE inter-domain database does not contain the same detail level • Keep topology confidential • Avoid scalability problems • Introduction of a "Grey-Box“ model to allow PCE known sufficient detail on foreign domain • Inputs and outputs correspond to the Border Nodes (BNs) • Grey-Boxes are interconnected through inter-domain links between BNs • Suitable performance indicators are given to connect and to cross the Grey-Boxes • TE metrics between Input BNs and Output BNs • Reminds some of the L1VPN work • PCE could look into the different inter-domain paths • Combine TE metrics of inter-domain links and Grey-Boxes • Select the most suitable one regarding the PCReq Domain(i) Domain(i+1) Inter-Domain Link BN BN BN BN Inter-Domain Link Inter-Domain Link + TE metrics + TE metrics + TE metrics Grey-Box TE metrics Grey-Box TE metrics

  4. Inter-domain status for PCE Database Population • PCE Database needs synchronization with other PCEs for inter-domain cooperation • BRPC and Hierarchical PCE would benefit from it • A PCE is the owner of metrics within its own domain and they must not be modified by another PCE • No aggregation or summarization are allowed • But some filtering/redistribution rules are needed (e.g. to reflect peer agreement) • Ongoing identified solutions • Management plane • North bound distribution of LSDB using BGP [draft-ietf-idr-ls-distribution] • PCNtf message to convey TE information of foreign domains • Today inside vendor attribute, tomorrow in a standard way? • PCEP extensions for stateful PCE raised the point • New PCEP messages for LSP DB synchronization • Why not consider PCE Database synchronization as a whole? • New draft common to all requirements on TED + LSP DB

  5. Next Steps • Get feedback from PCE WG • Some private e-mails, public discussion is also useful • PCE Database synchronization is a hot topic • LSP DB synchronization part of PCEP extension for Stateful PCE • Opportunity to federate PCE Database definition and PCEP extension to synchronize PCED? • Our next move: issue a -03 version • Taking into account GMPLS part • Adding analysis and best-current practice for intra-domain solutions • Adding analysis of inter-domain solutions

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