Port (computer networking)

Abstract: A plurality of media access control drivers are coupled to and provide a respective channel to connect a computer and the switched network. Each media access control driver has a first mode in which a connection is established in the switched network and a second mode in which the local area network protocol is passed over the switched network. The media access control drivers may also be placed in a third and fourth mode which allow communication in an unformatted and non-LAN based protocol. The architecture also includes at least one port connection manager which manages one of the channels when the respective media access control driver is in the first mode and a connection manager to manage a status of the connection. The media access control drivers are coupled to a protocol driver to send messages in the local area network protocol when the media access control drivers are in the second mode. Each of the media access control drivers include a table of parameters which describe the channel and a set of entry points to the channel. A protocol manager catalogs the tables for use by other modules.

Abstract: The seaport-hinterland interaction plays an increasingly important role in shaping supply chain solutions of shippers and logistics service providers. Scarcity concerns combined with concerns over the reliability of transport solutions have led seaports and hinterland corridors to take up a more active role in supply chains. This contribution looks at port developments and logistics dynamics in Europe and proposes some steps towards a further integration between seaports and the hinterland. The key point put forward in this paper is that the competitive battle among ports will increasingly be fought ashore. Hinterland connections are thus a key area for competition and coordination among actors. The paper approaches port-hinterland dynamics from the perspective of the various market players involved, including port authorities, shipping lines, terminal operators, transport operators (rail, barge, road and short sea) and logistics service providers. The paper will address the impact of horizontal and vertical relations in supply chains on the structure of these chains and on the relationships between seaports and the intermodal hinterland. Who takes or should take the lead in the further integration of ports and inland ports and what actions have been taken so far by the market players in this respect, will be examined. The incentives for market players to vertically or horizontally integrate will be analyzed against the backdrop of the nature of the market in which the various players operate.

Abstract: Management of forwarding databases in the case of link failures on bridges according to the all improved spanning tree, limits the propagation of notifications of topology change to only those parts of the network which are affected by the link failures, and trigger partial flushing as opposed to complete forwarding database flushing of learned MAC addresses to relearn the sets of addresses associated with ports affected by the change in topology. When a bridge moves its root port to a new port, the bridge can move the addresses learned through the original root port to the new root port without any relearning. The sets of addresses associated with the designated ports on upstream bridges from the old root port, are subject to flushing. Also when the bridge attaches to the new branch, it triggers a message to the root instructing all bridges in the new path to the root to flush addresses learned on their root ports.