DATA EXCHANGE METHOD AND APPARATUS

This application provides a data exchange method and apparatus. The method includes: A source node receives flow indication information from a first switching node, where the flow indication information indicates that congestion occurs in a target data flow, and the first switching node is a node in a switching path of the target data flow. The source node sends multiple pieces of write data information and multiple data blocks of the target data flow to multiple switching nodes, where the multiple pieces of write data information indicate the multiple switching nodes to store the multiple data blocks and stop forwarding the multiple data blocks. The multiple switching nodes store the multiple data blocks. The multiple switching nodes receive multiple pieces of scheduling information from a destination node, where the multiple pieces of scheduling information are used to schedule the multiple data blocks.