Method for managing virtual private network, and device

1. A method implemented by a first routing device, wherein the method comprises:

establishing a Border Gateway Protocol (BGP) Monitoring Protocol (BMP) session with a BMP server;

allocating a virtual private network (VPN) label associated with a VPN instance for communication between the first routing device and a second routing device, wherein the VPN label is configured to be carried-in data packets received by the first routing device from the second routing device; and

sending, to the BMP server, a BMP message comprising the VPN label.

2. The method of claim 1 , wherein the BMP message is an extended peer up notification message comprising a type-length-value (TLV), and wherein the TLV comprises the VPN label.

3. The method of claim 1 , wherein the BMP message is a newly-defined BMP message comprising a protocol data unit (PDU), and wherein the PDU comprises the VPN label.

4. The method of claim 3 , wherein the PDU comprises an identifier of the VPN instance and a corresponding relationship between the VPN label and an Internet Protocol (IP) address segment to which an IP address of a user equipment (UE) belongs.

5. The method of claim 1 , wherein the VPN label is a multi-protocol label switching (MPLS) label or a Segment Routing over IPv6 (SRv6) segment identifier (SID).

6. The method of claim 1 , further comprising:

receiving, from the second routing device, a data packet whose destination is a user equipment (UE) and which comprises the VPN label;

deleting the VPN label in the data packet to obtain a processed data packet; and

sending the processed data packet to the UE based on the VPN label.

7. The method of claim 1 , further comprising establishing a BGP session between the first routing device and the second routing device, wherein the VPN label is allocated in response to establishing the BGP session between the first routing device and the second routing device.

8. The method of claim 1 , wherein the VPN label identifies the VPN instance.

9. A first routing device comprising:

a memory configured to store instructions; and

one or more processors coupled to the memory and configured to execute the instructions to:

establish a Border Gateway Protocol (BGP) Monitoring Protocol (BMP) session with a BMP server;

allocate a virtual private network (VPN) label associated with a VPN instance for communication between the first routing device and a second routing device, wherein the VPN label is configured to be carried in data packets received by the first routing device from the second routing device; and

send, to the BMP server, a BMP message comprising the VPN label.

10. The first routing device of claim 9 , wherein the BMP message is an extended peer up notification message comprising a type-length-value (TLV), and wherein the TLV comprises the VPN label.

11. The first routing device of claim 9 , wherein the BMP message is a newly-defined BMP message comprising a protocol data unit (PDU), and wherein the PDU comprises the VPN label.

12. The first routing device of claim 11 , wherein the PDU comprises an identifier of the VPN instance and a corresponding relationship between the VPN label and an Internet Protocol (IP) address segment to which an IP address of a user equipment (UE) belongs.

13. The first routing device of claim 9 , wherein the VPN label is a multi-protocol label switching (MPLS) label or a Segment Routing over IPv6 (SRv6) segment identifier (SID).

14. The first routing device of claim 9 , wherein the one or more processors are further configured to:

receive, from the second routing device, a data packet whose destination is a user equipment (UE) and which comprises the VPN label;

delete the VPN label in the data packet to obtain a processed data packet; and

send the processed data packet to the UE based on the VPN label.

15. The first routing device of claim 9 , wherein the one or more processors are further configured to establish a BGP session between the first routing device and the second routing device, and wherein the VPN label is allocated in response to establishing the BGP session between the first routing device and the second routing device.

16. The first routing device of claim 9 , wherein the VPN label identifies the VPN instance.

17. A computer program product comprising instructions stored on a non-transitory computer-readable medium that, when executed by one or more processors, cause a first routing device to:

establish a Border Gateway Protocol (BGP) Monitoring Protocol (BMP) session with a BMP server;

allocate a virtual private network (VPN) label associated with a VPN instance for communication between the first routing device and a second routing device, wherein the VPN label is configured to be carried in data packets received by the first routing device from the second routing device; and

send, to the BMP server, a BMP message comprising the VPN label.

18. The computer program product of claim 17 , wherein the one or more processors are further configured to execute the instructions to cause the first forwarding device to:

receive, from the second routing device, a data packet whose destination is a user equipment (UE) and which comprises the VPN label;

delete the VPN label in the data packet to obtain a processed data packet; and

send the processed data packet to the UE based on the VPN label.

19. The computer program product of claim 17 , wherein the one or more processors are further configured to execute the instructions to cause the first forwarding device to establish a BGP session between the first routing device and the second routing device, and wherein the VPN label is allocated in response to establishing the BGP session between the first routing device and the second routing device.

20. The computer program product of claim 17 , wherein the VPN label identifies the VPN instance.