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Overview An LSR is said saturated when it runs out of a specific control plane resource and cannot handle any new TE-LSP Various reasons for such saturation Memory shortage CPU overaload The maximum number of LSPs configured by the operator is reached … Signaling extension so that a saturated LSR can properly reject any new TE-LSP, and notify the reasons for the rejection Routing extensions so that an LSR can advertise its control plane status (saturated or not) Routing and signaling extensions are complementary Used as a trigger for head-end LSRs to take appropriate actions |