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State management in interior nodes (stateless/red. state) Measurement-based No reservation states No refresh is needed Reservation-based Per PHB reservation state Reservations time-out or removed by explicit release Reservation can be done either per micro-flow or for aggregated flows (with aggregated session ID) Basic operation examples: Successful reservation Unsuccessful reservation in interior node Refresh Release Severe congestion (e.g. after re-routing) Bidirectional operation |