Packet transmission method and apparatus

A packet transmission apparatus, comprising:

• a memory, wherein the memory comprises instructions;
• and
• a processor configured to communicate with the memory, wherein the processor is configured to execute the instructions to:
• receive a first virtual extensible local area network (VXLAN) packet sent by a first service device through a first VXLAN tunnel, wherein the first VXLAN packet comprises a first VXLAN network identifier (VNI), the first VNI indicates that a broadcast domain (BD) to which the first VXLAN packet sent by the first service device through the first VXLAN tunnel belongs is a first BD, and the packet transmission apparatus and the first service device are located in a first data center (DC);
• determine first egress information corresponding to the first BD and a first destination media access control, MAC, address, based on a correspondence between the first BD, the first destination MAC address, and the first egress information, wherein the first destination MAC address indicates a destination address of an Ethernet frame contained in the first VXLAN packet, and the first egress information comprises a first virtual extensible local area network tunnel end point (VTEP) address and a second VNI, wherein
• generate a second VXLAN packet based on the first VXLAN packet and the first egress information, wherein the second VXLAN packet comprises the second VNI and the Ethernet frame;
• and
• send the second VXLAN packet to a second transmission device through a second VXLAN tunnel, wherein the second transmission device is located in a second DC, the first VTEP address indicates an address through which the second transmission device connects to the second VXLAN tunnel, and the second VNI indicates that a BD to which the second VXLAN packet sent by the packet transmission apparatus through the second VXLAN tunnel belongs is a second BD.

A non-transitory computer-readable storage medium, comprising instructions which, when executed by a computer, cause the computer to carry out the instructions to:

• receive a first virtual extensible local area network (VXLAN) packet sent by a first service device through a first VXLAN tunnel, wherein the first VXLAN packet comprises a first VXLAN network identifier (VNI), the first VNI indicates that a broadcast domain (BD) to which the first VXLAN packet sent by the first service device through the first VXLAN tunnel belongs is a first BD, and the computer and the first service device are located in a first data center (DC);
• determine first egress information corresponding to the first BD and a first destination media access control, MAC, address, based on a correspondence between the first BD, the first destination MAC address, and the first egress information, wherein the first destination MAC address indicates a destination address of an Ethernet frame contained in the first VXLAN packet, and the first egress information comprises a first virtual extensible local area network tunnel end point (VTEP) address and a second VNI;
• generate a second VXLAN packet based on the first VXLAN packet and the first egress information, wherein the second VXLAN packet comprises the second VNI and the Ethernet frame;
• and
• send the second VXLAN packet to a second transmission device through a second VXLAN tunnel, wherein the second transmission device is located in a second DC, the first VTEP address indicates an address through which the second transmission device connects to the second VXLAN tunnel, and the second VNI indicates that a BD to which the second VXLAN packet sent by the computer through the second VXLAN tunnel belongs is a second BD.