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Example 1: check of the path computation chain liveness for TE LSP T1 (no path computation), path computation chain unknown PCE-ID optionally recorded Three use cases (example shown when the BRPC procedure is in use) *PCE ABR1 ABR3 B A Area 0 ABR3 ABR4 * * * * B Area 2 Area 1 ABR1 ABR3 B A ABR3 ABR4 * * * * B Area 2 Area 1 Example 2: Path computation request + performance metric along the path computation chain. PCE-ID optionally recorded Area 0 |