A method, apparatus and/or system of selecting a routing in an asymmetric link, in which an arbitrary intermediate node of the at least one intermediate node receives routing request information including a first link quality for a path from the source node to the arbitrary neighbor node from an arbitrary neighbor node of the arbitrary intermediate node, acquires a second link quality for a path between the arbitrary intermediate node and the arbitrary neighbor node, acquires a third link quality based on the first and second link qualities, updates the first link quality in the routing request information with the third link quality, and broadcasts an updated routing request information to other neighbor node for the destination node to determine at least one of a desirable forward path or a desirable backward path from the source node to the destination node, may be provided.

A method for the exchange of data between nodes of a server cluster comprising a plurality of nodes interconnected together by a geographic interconnection network comprising a plurality of transmission segments linking the nodes together, including sending by a sending node, data intended for at least one other node, or receiving node, transmitting the data using the geographic interconnection network, receiving the data by each receive node, supplying the data to each receiving node with information relating to the transmission segments of the geographic interconnection network traversed between the sending node and this receiving node on the transmission thereof.

In exemplary embodiments of the present invention, a router determines whether or not to establish a stateful routing session based on the suitability of one or more candidate return path interfaces. This determination is typically made at the time a first packet for a new session arrives at the router on a given ingress interface. In some cases, the router may be configured to require that the ingress interface be used for the return path of the session, in which case the router may evaluate whether the ingress interface is suitable for the return path and may drop the session if the ingress interface is deemed by the router to be unsuitable for the return path. In other cases, the router may be configured to not require that the ingress interface be used for the return path, in which case the router may evaluate whether at least one interface is suitable for the return path and drop the session if no interface is deemed by the router to be suitable for the return path.

A network switch comprising a plurality of ports each comprising a plurality of queues, and a processor coupled to the plurality of ports, the processor configured to obtain a packet traveling along a path from a source to a destination, determine a reverse path port positioned along a reverse path from the destination to the source, obtain a queue occupancy counter from the packet, the queue occupancy counter indicating an aggregate congestion of queues along the reverse path, and update the queue occupancy counter with congestion data of the queues for the reverse path port.

The present application provides virtual shortest path tree establishment and processing methods and a path computation element, so as to improve a resource utilization rate in a process of establishing and processing a virtual shortest path tree. In a process of establishing the virtual shortest path tree, a cost of an established path from a root node (a destination node) to a leaf node is compared with a cost threshold, and a new path branch is added to the VSPT when the cost is less than the cost threshold. In a process of processing the virtual shortest path tree, a resource occupied by a path branch in the VSPT that does not belong to an optimal path is released after the optimal path is obtained.

A method using a communication system including a first information processing device, a first communication device, a second information processing device, a second communication device, and a control device controlling the first communication device and the second communication device, the method includes transmitting, from the first information processing device, a first packet which belongs to a first flow, a destination node of the first packet being the second information processing device, receiving, by the second communication device, the first packet, and discarding the first packet, identifying the first information processing device which is a transmission source node of the first packet, transmitting a second packet of which a destination node is the first information processing device, receiving, by the first communication device, the second packet, setting the first rule to the first communication device.

A router determines whether or not to establish a stateful routing session based on the suitability of one or more candidate return path interfaces. This determination is made when a first packet for a new session arrives at the router on a given ingress interface. For example, the router may be configured to require the ingress interface be used for the return path of the session, and the router may evaluate whether the ingress interface is suitable for the return path and may drop the session if the ingress interface is unsuitable for the return path. In other examples, the router may be configured to not require that the ingress interface be used for the return path, and the router may evaluate whether at least one interface is suitable for the return path and drop the session if no interface is suitable for the return path.