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What are differences in this bi-directional signaling from the existing GMPLS RSVP-TE? Path message Contains Upstream Label Set Object in addition to Upstream Label Object. Even when an Upstream Label is not acceptable, do not issue PathErr as long as an Upstream Label Set is acceptable. Egress node Two cases are supported. Case 1 (backward compatibility) When the egress node receives a Path message including an Upstream Label, follow the same way as the existing procedure. One-way signaling is used to emit upstream data. Case 2 If an Upstream label is NOT included and an Upstream Label Set IS included in the Path message, the upstream path is established by the Resv message. 1.5 round-trip is employed to emit upstream data.