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This paper proposes a new scheme for multi-layer traffic engineering (MTE) in generalized multi-protocol label switching (GMPLS) IP over optical networks. The scheme routes IP traffic guaranteeing sufficient bandwidth, high transmission quality and low resource usage. The routing decision is made via a cost metric which considers lightpath's power penalty and propagation delay and number of available wavelengths and transmitters. The requests are accommodated on mixed (lambda and packet) GMPLS label switched paths (LSPs) installed by nested RSVP-TE sessions. Extensive simulations demonstrate the good quality of the scheme's performance in terms of blocking probability and resource usage.