Method and apparatus for automatic discovery in optical transport networks

In order to optical transmission network the link is connected with the improvement the invention claims a method and relative network node. The first network node has a first discovery agent second network node having a second discovery agent. Discovery message from said first network node of the first interface by one or more subsequent network link to the second network node the second interface port of transmission. The finding message comprises index and said first discovery agent which is associated with the discovery agent identifier information and indication and the first interface which is associated with the terminal is connected with the point identifiers information. In order to transmit the discovery message of said first interface is configured to use the transmission of signal frame the spending of the parts of the reservation words to perform connected in series connected with power source function. Said second interface is configured to the signal frame received by the same the reservation of the field is executed on the serial link monitoring function. The discovery message using the pre-set field in which can be used for the path track identifier tti byte to transmit.