Abstract: A packet control method, a flow table update method, and a node device including a first queue and a second queue, where the method includes: obtaining, by the node device, a first packet; determining, by the node device, that a data flow to which the first packet belongs is marked as an isolated flow; and if the first queue and/or the second queue meet and/or meets a first preset condition, controlling, by the node device, the first packet to enter the first queue and wait to be scheduled; or if the first queue and/or the second queue meet and/or meets a second preset condition, controlling, by the node device, the first packet to enter the second queue and wait to be scheduled.

Abstract: The present invention discloses a packet control method and a node device, to improve reliability of a data flow in a transmission process. The method includes: After receiving a pause frame, a first node automatically applies, based on adjustment information that is of a send queue of a data flow and that is recorded in a state record set, the pause frame to all queues associated in an adjustment process of the send queue of the data flow. In this way, a packet loss problem in a data transmission process can be avoided without adjusting an XOFF/XON threshold of a receive queue and without increasing a quantity of pause frames in a network system, thereby improving reliability of the data flow in the transmission process.

Abstract: A packet control method, a flow table update method, and a node device including a first queue and a second queue, where the method includes: obtaining, by the node device, a first packet; determining, by the node device, that a data flow to which the first packet belongs is marked as an isolated flow; and if the first queue and/or the second queue meet and/or meets a first preset condition, controlling, by the node device, the first packet to enter the first queue and wait to be scheduled; or if the first queue and/or the second queue meet and/or meets a second preset condition, controlling, by the node device, the first packet to enter the second queue and wait to be scheduled.

Abstract: A switch for connection in a network of other like switches and includes memory for storing data packets, a control system arranged to control the switch to, upon receipt at one of the ingress or egress ports of notification of congestion at a downstream congested port, either store at said ingress port or egress port data packets received for said congested port or to communicate with an upstream port for storage at said upstream port of data packets destined for the congested port, and in dependence on the current of stored data, to send a message to a further upstream port informing the further upstream port of the congestion downstream. The memory is provided substantially only at the ingress ports or the egress ports of the switch.

Abstract: A method of congestion management within a switch or network of connected switches is provided, wherein the or each of the switches has a plurality of ingress ports and a plurality of egress ports. The method involves, when congestion is detected at a first ingress or egress port, sending a message to an upstream port connected to the first ingress or egress port indicating that congestion has occurred at a particular port and requesting storage at the upstream port of data packets destined for that port; and, in dependence on the amount of data packets destined for the congested port stored at the upstream port, sending from the upstream port to a further upstream port a message informing the further upstream port of the congestion at the congested port, the further upstream port storing at the further upstream port data packets destined for the congested port.

Abstract: A switch for connection in a network of other like switches and includes memory for storing data packets, a control system arranged to control the switch to, upon receipt at one of the ingress or egress ports of notification of congestion at a downstream congested port, either store at said ingress port or egress port data packets received for said congested port or to communicate with an upstream port for storage at said upstream port of data packets destined for the congested port, and in dependence on the current of stored data, to send a message to a further upstream port informing the further upstream port of the congestion downstream. The memory is provided substantially only at the ingress ports or the egress ports of the switch.

Abstract: A method of congestion management within a switch or network of connected switches is provided, wherein the or each of the switches has a plurality of ingress ports and a plurality of egress ports. The method involves, when congestion is detected at a first ingress or egress port, sending a message to an upstream port connected to the first ingress or egress port indicating that congestion has occurred at a particular port and requesting storage at the upstream port of data packets destined for that port; and, in dependence on the amount of data packets destined for the congested port stored at the upstream port, sending from the upstream port to a further upstream port a message informing the further upstream port of the congestion at the congested port, the further upstream port storing at the further upstream port data packets destined for the congested port.

Abstract: The present invention discloses a scalable flow-control mechanism. In accordance with the present invention, there is provided a switching device for transporting packets of data, the packets being received at the switching device based on flow-control information, the device comprising a memory for storing the packets, a credit counter coupled to the memory for counting a credit number of packets departing from the memory, and a scheduler unit coupled to the credit counter for deriving the flow-control information in response to the credit number. Moreover, a switching apparatus and a method for generating flow-control information is disclosed.

Abstract: The present invention discloses a scalable flow-control mechanism. In accordance with the present invention, there is provided a switching device for transporting packets of data, the packets being received at the switching device based on flow-control information, the device comprising a memory for storing the packets, a credit counter coupled to the memory for counting a credit number of packets departing from the memory, and a scheduler unit coupled to the credit counter for deriving the flow-control information in response to the credit number. Moreover, a switching apparatus and a method for generating flow-control information is disclosed.

Abstract: Method and Switching fabric for ccounteracting a saturation tree occurring in a network with nodes An example of a method comprises the steps of generating at a local node where a congestion emerges a first congestion information; sending the first congestion information to at least one upstream node; responsive to one received first congestion information comparing the content of the received first congestion information with a present local status based on a set of predefined rules in order to identify at least one packet stream causing the congestion, and generating a second congestion information comprising the identified at least one packet stream causing the congestion; and sending the second congestion information to at least one further upstream node from where the identified at least one packet stream was received.

Abstract: The present invention describes a method and system that allows a network to alter its routing strategy from one routing function to another while the network is up and running. For networks with link level backpressure, the method provides a deadlock free transition between the routing strategies. A variant of the method also guarantees that all packets will be delivered in order.

Abstract: The present invention discloses a scalable flow-control mechanism. In accordance with the present invention, there is provided a switching device for transporting packets of data, the packets being received at the switching device based on flow-control information, the device comprising a memory for storing the packets, a credit counter coupled to the memory for counting a credit number of packets departing from the memory, and a scheduler unit coupled to the credit counter for deriving the flow-control information in response to the credit number. Moreover, a switching apparatus and a method for generating flow-control information is disclosed.