CONGESTION CONTROL METHOD AND APPARATUS

The present invention discloses a congestion control method and an apparatus, relates to the field of communications technologies, and is applied to a tree topology network, so as to alleviate congestion of a congested link without affecting bandwidth of another uncongested link, thereby optimizing a throughput of the entire network. The method includes: receiving, by a root node network element, a first link notification message that is sent by a first intermediate node network element and that carries at least link status information of a first link that is directly connected to a first port of the first intermediate node network element; determining, based on the link status information of the first link, that the first link is congested; determining an identifier of a first leaf node network element based on a correspondence between an identifier of the first port and the identifier of the first leaf node network element; determining a service queue of the first leaf node network element based on a correspondence between the identifier of the first leaf node network element and an identifier of the service queue of the first leaf node network element; and lowering output bandwidth of the service queue of the first leaf node network element.