Data switching system, method for sending data traffic, and switching apparatus

A switching apparatus, wherein the switching apparatus is any one of M switching apparatuses in a first subsystem of K subsystems in a data switching system, the switching apparatus comprises multiple network side ports, and the multiple network side ports comprise M−1 intra-group ports and K−1 inter-group ports, each of the multiple network side ports comprises a transmit optical interface and a receive optical interface;

• wherein the first subsystem further comprises an N*N intra-group optical interleaver;
• wherein M and N are both natural numbers, and M≦N;
• wherein all transmit optical interfaces of the M−1 intra-group ports are connected to an input port of the N*N intra-group optical interleaver, and all receive optical interfaces of the M−1 intra-group ports are connected to an output port of the N*N intra-group optical interleaver;
• and
• wherein the K−1 inter-group ports are respectively connected to direct switching apparatuses, of the first switching apparatus, in K−1 subsystems in the K subsystems except the first subsystem;
• wherein the switching apparatus further comprises:
• a receiver, configured to acquire data traffic through a user side port;
• a processor, configured to query a multipath forwarding table according to a destination address of the data traffic to obtain a multipath forwarding entry comprising the destination address, wherein the multipath forwarding entry comprises a correspondence between the destination address and multiple network side ports;
• and
• a transmitter, configured to send the data traffic according to the multiple network side ports in a load balancing manner, so that all portions of data traffic in the data traffic reach, via different paths, a destination switching apparatus that is located in the same data switching system as the switching apparatus.

A switching apparatus, wherein the switching apparatus is any one of M switching apparatuses in a first subsystem of K subsystems in a data switching system, the switching apparatus comprises multiple network side ports, and the multiple network side ports comprise M−1 intra-group ports and K−1 inter-group ports, each of the multiple network side ports comprises a transmit optical interface and a receive optical interface;

• wherein the first subsystem further comprises an N*N intra-group optical interleaver;
• wherein M and N are both natural numbers, and M≦N,
• wherein all transmit optical interfaces of the M−1 intra-group ports are connected to an input port of the N*N intra-group optical interleaver, and all receive optical interfaces of the M−1 intra-group ports are connected to an output port of the N*N intra-group optical interleaver;
• and
• wherein the K−1 inter-group ports are respectively connected to direct switching apparatuses, of the first switching apparatus, in K−1 subsystems in the K subsystems except the first subsystem;
• wherein the switching apparatus further comprises:
• a receiver, configured to receive data traffic sent by another switching apparatus, wherein the another switching apparatus is any switching apparatus in a data switching system except the switching apparatus;
• a processor, configured to determine whether a forwarding flag is encapsulated for the data traffic, wherein the forwarding flag is used for instructing the switching apparatus to query a shortest-path forwarding table to acquire a shortest-path forwarding entry of the data traffic, wherein the shortest-path forwarding entry comprises a correspondence between a destination address of the data traffic and one network side port;
• and when the forwarding flag is encapsulated for the data traffic, determine whether a destination switching apparatus of the data traffic is the switching apparatus;
• and
• a transmitter, configured to forward the data traffic according to a result determined by the processor.