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PCE Applicability - Unified Signaling Solutions With RWA done by PCE Given a routing and wavelength assignment solution e.g. derived from a PCE, an ingress node can put one wavelength label in Label set or a Suggested label object to specify the wavelength. With only routing done by PCE An ingress node can set one or more available wavelength label objects in Label set, and let the egress node resolve the wavelength assignment in a distributed fashion. No interaction with PCE Because this signaling solution can resolve wavelength assignment problem itself, even without interaction with a PCE, by using an explicit route e.g. manually, it is still possible to establish a bidirectional lightpath. For example, for quick recovery from failures, bidirectional signaling may negate a PCE request. |