Port (computer networking)

Abstract: The ever-changing environment in which ports operate has put strong pressure on the traditional role of public port authorities. Market developments have created the need for ports to be part of wider logistics networks and to provide value-added services. Powerful private players who are organised on a global scale, such as carriers, terminal operators and logistics service providers, struggle to gain control over port-oriented logistics networks whereas port authorities very often seem to remain local spectators with limited influence on these market-driven processes. Port authorities are on the other hand, the focal point of criticism from societal interests such as local government, NGOs and citizens for negative externalities related to port development and port operations even if these do not always fall within their direct responsibility. In 1990, Richard Goss questioned, albeit rather rhetorically, the need to have public sector port authorities. Since then scholars have demonstrated a true renais...

Abstract: A port aggregation protocol (PAGP) dynamically aggregates redundant links between two neighboring devices in a computer network through the exchange of aggregation protocol data unit (AGPDU) frames between the two devices. Each AGPDU frame contains a unique identifier corresponding to the device sourcing the frame and a port number corresponding to the port through which the frame is forwarded. The exchange of AGPDU frames and the information contained therein allows the neighboring devices to identify those ports corresponding to the redundant links. Each device then dynamically aggregates its ports corresponding to the redundant links into a logical aggregation port (agport) which appears as a single, high-bandwidth port or interface to other processes executing on the device.