Method for establishing or switching an optical transmission path in order to transmit an optical signal , wherein a telecommunications network comprises a plurality of optical network nodes and wherein the optical transmission path traverses at least two consecutive optical network nodes of a transmission segment, the at least two consecutive optical network nodes comprising at least a segment source optical node and at least a segment destination optical node , wherein, regarding the establishment or switching of the optical transmission path, a segment optical switching identifier information is transmitted by the segment source optical node and received by the segment destination optical node , wherein the segment optical switching identifier information is transmitted together with the optical signal , wherein the segment destination optical node comprises a probe optical branch and at least a first output port (B') and at least a second output port (C'), wherein, in order to establish or to switch the optical transmission path through the optical network nodes of the telecommunications network , the method comprises the following steps: -- in a first step, the segment optical switching identifier information is detected and determined by the segment destination optical node and -- in a second step, the segment destination optical node is controlled such that - depending on the determined content of the segment optical switching identifier information - either the first output port (B') or the second output port (C') is selected regarding establishing or switching the optical transmission path of the optical signal , characterized in that the segment optical switching identifier information is able to be enriched, by a local node controller of the optical network node , by means of additional information in order to change a preconfigured route or path that is defined by a global source optical node. wherein, regarding the establishment or switching of the optical transmission path, a segment optical switching identifier information is transmitted by the segment source optical node and received by the segment destination optical node , wherein the segment optical switching identifier information is transmitted together with the optical signal , wherein the segment destination optical node comprises a probe optical branch and at least a first output port (B') and at least a second output port (C'), wherein, in order to establish or to switch the optical transmission path through the optical network nodes of the telecommunications network , the method comprises the following steps: -- in a first step, the segment optical switching identifier information is detected and determined by the segment destination optical node and -- in a second step, the segment destination optical node is controlled such that - depending on the determined content of the segment optical switching identifier information - either the first output port (B') or the second output port (C') is selected regarding establishing or switching the optical transmission path of the optical signal , -- in a first step, the segment optical switching identifier information is detected and determined by the segment destination optical node and -- in a second step, the segment destination optical node is controlled such that - depending on the determined content of the segment optical switching identifier information - either the first output port (B') or the second output port (C') is selected regarding establishing or switching the optical transmission path of the optical signal , characterized in that the segment optical switching identifier information is able to be enriched, by a local node controller of the optical network node , by means of additional information in order to change a preconfigured route or path that is defined by a global source optical node. <EOS>