Data transmission method, device, and system

A device, wherein the device comprises:

• at least one processor, a memory storing instructions executable by the at least one processor, a transmitter, and a receiver, wherein:
• the receiver is configured to receive an Ethernet packet, wherein the Ethernet packet carries a first packet header check bit, and wherein the first packet header check bit is used to perform a check on forwarding information of the Ethernet packet;
• the instructions instruct the at least one processor to:
• perform a check on the forwarding information of the Ethernet packet based on the first packet header check bit;
• and
• determine forwarding behavior of the Ethernet packet based on a check result of the forwarding information of the Ethernet packet.

A system, wherein the system comprises:

• a first device and a second device;
• wherein the first device is configured to:
• receive common public radio interface (CPRI) data;
• encapsulate the CPRI data into an Ethernet packet;
• add a first packet header check bit to the Ethernet packet, wherein the first packet header check bit is used to perform a check on forwarding information of the Ethernet packet;
• and
• send the Ethernet packet;
• and
• wherein the second device is configured to:
• receive the Ethernet packet;
• perform a check on the forwarding information of the Ethernet packet based on the first packet header check bit;
• decapsulate the CPRI data from the Ethernet packet based on a check result of the forwarding information of the Ethernet packet;
• and
• send the CPRI data.