Network congestion handling method and related apparatus

A network congestion handling method, comprising:

• receiving, by a second network device, a first notification from a first network device, wherein the first notification comprises information of a network device to which a target port belongs and information of the target port, and the target port is a port that is in a pre-congestion state, wherein the pre-congestion state is a state in which congestion is about to occur but has not occurred;
• and the second network device is a network device capable of sending, through at least two forwarding paths, a data flow to a host corresponding to the target port;
• determining, by the second network device, a target data flow, wherein a first forwarding path of the target data flow comprises the target port;
• determining, by the second network device, whether an idle egress port capable of forwarding the target data flow is available on the network device to which the target port belongs;
• and
• processing, by the second network device, the target data flow;
• wherein the information of the network device to which the target port belongs includes a role of the network device and the information of the target port includes an attribute of the target port, wherein the role of the network device includes one of the following:
• an access device, an aggregation device, or a core device, and wherein the attribute of the target port includes whether a direction in which the target port sends the data flow is uplink or downlink.

A network device for handling network congestion, wherein the network device is a first network device, comprising a memory and a processor, wherein:

• the memory is configured to store program code;
• and
• the processor is configured to execute the program code to:
• determine a target port, wherein the target port is an egress port that is in a pre-congestion state, wherein the pre-congestion state is a state in which congestion is about to occur but has not occurred;
• and
• send a first notification to at least one second network device, wherein the at least one second network device is capable of sending, through at least two forwarding paths, a data flow to a host corresponding to the target port, and the first notification comprises information of a network device to which the target port belongs and information of the target port;
• wherein the information of the network device to which the target port belongs includes a role of the network device and the information of the target port includes an attribute of the target port, wherein the role of the network device includes one of the following:
• an access device, an aggregation device, or a core device, and wherein the attribute of the target port includes whether a direction in which the target port sends the data flow is uplink or downlink.

A network device for handling network congestion, wherein the network device is a second network device, comprising a memory and a processor, wherein:

• the memory is configured to store program code;
• and
• the processor is configured to execute the program code to:
• receive a first notification from a first network device, wherein the first notification comprises information of a network device to which a target port belongs and information of the target port, and the target port is a port that is in a pre-congestion state, wherein the pre-congestion state is a state in which congestion is about to occur but has not occurred;
• and the second network device is a network device capable of sending, through at least two forwarding paths, a data flow to a host corresponding to the target port;
• determine a target data flow, wherein a first forwarding path of the target data flow comprises the target port;
• determine whether an idle egress port capable of forwarding the target data flow is available on the network device to which the target port belongs;
• and
• process the target data flow;
• wherein the information of the network device to which the target port belongs includes a role of the network device and the information of the target port includes an attribute of the target port, wherein the role of the network device includes one of the following:
• an access device, an aggregation device, or a core device, and wherein the attribute of the target port includes whether a direction in which the target port sends the data flow is uplink or downlink.