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Do Solutions Exist? Two unidirectional lightpaths in converse directions with the same wavelength (A1) Sequentially verify the same wavelength availability in both directions and crankback if failure. Label set and Upstream label + crankback (A2) Specify wavelength on both directions Label set and Upstream Label set (A3) Add constraint in wavelength available information updating process on both directions in Label set and Upstream Label set Label Set Object and Bidirectional Lightpath (Prop) Using LSP_ATTRIBUTES Object [RFC 4420] Upstream-and-Downstream common free wavelengths information updating at each node and carried by Label set |