Flow entry generating method and apparatus

A flow entry generating apparatus, comprising a processor and a memory:

• wherein the processor is configured to couple the memory and execute program instructions to cause the flow entry generating apparatus to:
• receive a service path establishment request comprising:
• a constraint, a source device, and a target device, wherein the constraint comprises information indicating at least one of a bandwidth, a delay, IP layer first, optical layer first, and shared risk link group information, and
• find, in a data transmission network according to a cross-layer information model, a service path that meets the constraint carried in the service path establishment request and is from the source device to the target device, wherein the cross-layer information model describes a topology relationship between an IP layer and an optical layer and in the cross-layer information model a resource in the IP layer and a resource in the optical layer are both located at a same layer, and
• generate a respective corresponding flow entry for each forwarding device in the service path, and the flow entry is sent to a corresponding forwarding device;
• and,
• wherein the topology relationship between the IP layer and the optical layer comprises:
• multiple nodes, a link between the multiple nodes, and an attribute of the link, wherein the multiple nodes comprise an IP layer port node and an access stratum node, and the multiple nodes further comprise at least one of an optical path layer node, a timeslot layer node, and a wavelength layer node, wherein the IP layer port node is a node abstracted from a port of an IP layer device in the data transmission network, the access stratum node is a node abstracted from a tributary side port of an optical layer device in the data transmission network, the optical path layer node is a node abstracted from an optical path layer of the optical layer device in the data transmission network, the timeslot layer node is a node abstracted from a timeslot layer of the optical layer device in the data transmission network, and the wavelength layer node is a node abstracted from a wavelength layer of the optical layer device in the data transmission network.

A service path obtaining method implemented in a controller, comprising:

• acquiring information of multiple nodes, a link between the multiple nodes, and an attribute of the link;
• obtaining a cross-layer information model according to the information of multiple nodes, the link between the multiple nodes, and the attribute of the link, wherein in the cross-layer information model a resource in an IP layer and a resource in an optical layer are both located at a same layer;
• receiving a service path establishment request comprising a constraint, a source device, and a target device;
• and
• computing, according to the cross-layer information model, a service path meets the constraint carried in the service path establishment request and is from the source device to the target device;
• and, wherein
• the cross-layer information model describes topology relationship between an IP layer and an optical layer;
• an attribute of a link between two timeslot layer nodes comprises:
• a bandwidth, a delay, a weight, a shared risk link group identifier, and a timeslot;
• an attribute of a link between two wavelength layer node comprises:
• a bandwidth, a delay, a weight, a shared risk link group identifier, a wavelength, and a timeslot;
• and
• an attribute of remaining links comprises:
• a bandwidth, a delay, a weight, and a shared risk link group identifier.