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PCE Architectural Considerations synchronization non-synchronized (e.g., PCE makes multiple individual path computations to generate set of paths) synchronized (e.g., single PCE invokes computations by other PCEs before supplying result to PCC PCE discovery & load balancing detecting PCE liveness PCC-PCE & PCE-PCE communication PCE TED synchronization stateful vs. stateless PCEs monitoring policy & confidentiality must preserve confidentiality across multiple SPs must ensure confidentiality & security of PCC-PCE & PCE-PCE messages |