Abstract: Disclosed is a method for providing flow control of Ethernet frames transported over a transport SDH/SONET network. The method is characterized by comprising the following steps: at the network elements that host the sending and receiving points, providing termination blocks for storing queues of Ethernet frames, when the filling of termination block queue at the receiving node reaches a danger threshold, generating a Link Back-pressure Request and forwarding it to termination block at the transmitting node along the opposite direction; upon receipt of this request at the termination block suspending the transmission of other already stored Ethernet frames by until the disappearance of the Link Back-pressure Request.