Service chaining of virtual network functions in a cloud computing system

1. A method of provisioning a network service in a cloud computing system, comprising:

defining, at an orchestrator, the network service to include a plurality of network functions;

defining, at the orchestrator, network connectivity among the plurality of network functions, wherein the connectivity includes layer-2 or layer-3 network connectivity between network functions;

defining a location of each network function of the network service;

identifying a plurality of vendor device managers (VDMs) configured to provision virtual network functions that implement the plurality of network functions, wherein the plurality of VDMs are identified based on the location of each network function of the network service; and

instructing, by the orchestrator, the plurality of VDMs to deploy the virtual network functions.

2. The method of claim 1 , wherein the orchestrator is configured to deploy a plurality of built-in virtual network functions, and wherein the method further comprises:

identifying at least one built-in virtual network function for implementing a respective at least one network function of the network service; and

identifying, at the orchestrator, additional network connectivity between the virtual network functions and the built-in virtual network functions.

3. The method of claim 2 , further comprising deploying, by the orchestrator, the at least one built-in virtual network function having the additional network connectivity.

4. The method of claim 1 , wherein the orchestrator is implemented in a first data center and each of the plurality of VDMs is implemented in an additional data center.

5. The method of claim 1 , further comprising defining an order of the plurality of network functions of the network service.

6. The method of claim 5 , wherein the network connectivity of the plurality of network functions is based on the order defined for the plurality of network functions of the network service.

7. The method of claim 1 , wherein the plurality of network functions are provided by a plurality of different vendors.

8. A system for provisioning a network service in a cloud computing system, comprising:

at least one memory; and

at least one processor coupled to the at least one memory, the at least one processor and the at least one memory configured to:

define, at an orchestrator, the network service to include a plurality of network functions;

define, at the orchestrator, network connectivity among the plurality of network functions, wherein the connectivity includes layer-2 or layer-3 network connectivity between network functions;

define a location of each network function of the network service;

identify a plurality of vendor device managers (VDMs) configured to provision virtual network functions that implement the plurality of network functions, wherein the plurality of VDMs are identified based on the location of each network function of the network service; and

instruct, by the orchestrator, the plurality of VDMs to deploy the virtual network functions.

9. The system of claim 8 , wherein the orchestrator is configured to deploy a plurality of built-in virtual network functions, and wherein the at least one processor and the at least one memory are further configured to:

identify at least one built-in virtual network function for implementing a respective at least one network function of the network service; and

identify, at the orchestrator, additional network connectivity between the virtual network functions and the built-in virtual network functions.

10. The system of claim 9 , wherein the at least one processor and the at least one memory are further configured to deploy, by the orchestrator, the at least one built-in virtual network function having the additional network connectivity.

11. The system of claim 8 , wherein the orchestrator is implemented in a first data center and each of the plurality of VDMs is implemented in an additional data center.

12. The system of claim 8 , wherein the at least one processor and the at least one memory are further configured to define an order of the plurality of network functions of the network service.

13. The system of claim 12 , wherein the network connectivity of the plurality of network functions is based on the order defined for the plurality of network functions of the network service.

14. The system of claim 8 , wherein the plurality of network functions are provided by a plurality of different vendors.

15. A non-transitory computer readable medium storing instructions that, when executed by one or more processors, cause the one or more processors to:

define, at an orchestrator, a network service to include a plurality of network functions;

define, at the orchestrator, network connectivity among the plurality of network functions, wherein the connectivity includes layer-2 or layer-3 network connectivity between network functions;

define a location of each network function of the network service;

identify a plurality of vendor device managers (VDMs) configured to provision virtual network functions that implement the plurality of network functions, wherein the plurality of VDMs are identified based on the location of each network function of the network service; and

instruct, by the orchestrator, the plurality of VDMs to deploy the virtual network functions.

16. The non-transitory computer readable medium of claim 15 , wherein the orchestrator is configured to deploy a plurality of built-in virtual network functions, and wherein the instructions, when executed by the one or more processors, further cause the one or more processors to:

identify at least one built-in virtual network function for implementing a respective at least one network function of the network service; and

identify, at the orchestrator, additional network connectivity between the virtual network functions and the built-in virtual network functions.

17. The non-transitory computer readable medium of claim 16 , wherein the instructions, when executed by the one or more processors, further cause the one or more processors to deploy, by the orchestrator, the at least one built-in virtual network function having the additional network connectivity.

18. The non-transitory computer readable medium of claim 15 , wherein the orchestrator is implemented in a first data center and each of the plurality of VDMs is implemented in an additional data center.

19. The non-transitory computer readable medium of claim 15 , wherein the instructions, when executed by the one or more processors, further cause the one or more processors to define an order of the plurality of network functions of the network service.

20. The non-transitory computer readable medium of claim 19 , wherein the network connectivity of the plurality of network functions is based on the order defined for the plurality of network functions of the network service.