Service virtualization over content-centric networks

• US 8,244,881 B2
• Filed: 08/06/2010
• Issued: 08/14/2012
• Est. Priority Date: 08/06/2010
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Palo Alto Research Center, Inc. (Xerox Holdings Corp.)
• Inventors: Thornton, James D., Jacobson, Van L., Smetters, Diana K.
• Primary Examiner(s): WANG, LIANG CHE A
• Application Number:
  US12/852,302
• Publication Number:
  US 20120036180A1
• Time in Patent Office: 739 Days
• Field of Search: 709/201, 709/202, 709/203, 709/227, 709/228, 709/229, 709/230
• US Class Current: 709/227
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/1027 Persistence of sessions during load balancing

Abstract

One embodiment of the present invention provides a system for facilitating network service virtualization. During operation, the system receives a service request from a client, and initializes a communication session with the client. The system constructs an interest using session state information that can identify the client and/or a previous communication session. The interest comprises a hierarchically structured variable-length name. The system then broadcasts the interest to a number of servers. The system subsequently forwards to the client data received from a server which responds first to the interest.

Claims

1. A computer-executable method for facilitating network service virtualization, comprising:

receiving, by a proxy server, a service request from a client;

extracting session state information from the received service request, wherein the session state information facilitates identifying a previous communication session associated with the client;

initializing a communication session with the client;

constructing, by the proxy sever, an interest packet, wherein the interest packet comprises a hierarchically structured variable-length name, and wherein the hierarchically structured variable-length name indicates the session state information;

broadcasting the interest packet to a number of servers; and

forwarding, to the client, data received from a first server which responds first to the interest packet.

2. The method of claim 1, further comprising disregarding future responses from unselected servers.

3. The method of claim 1, wherein the data is forwarded to the client over a transport control protocol (TCP) session, and wherein the interest packet includes a TCP session identifier.

4. The method of claim 3, wherein the session state information includes a hypertext transfer protocol (HTTP) cookie.

5. The method of claim 1, wherein the data is forwarded to the client over a secure sockets layer (SSL) connection.

6. The method of claim 5, wherein the session state information includes an SSL session identifier.

7. The method of claim 1, further comprising receiving a packet responding to the service request from the first server, wherein corresponding session state information is embedded in a name of the packet, thereby facilitating the first server to receive future packets from the client for the communication session.

8. The method of claim 1, further comprising:

forwarding a packet from the client to a second server, wherein the second server is configured to receive session state information associated with the communication session from the first server.

9. The method of claim 8, wherein receiving the session state information from the first server comprises:

broadcasting, from the second server to all servers, an interest for the session state information; and

receiving a response, at the second server from the first server, wherein the response contains the session state information associated with the communication session, thereby enabling the communication session to continue on the second server.

10. The method of claim 1, further comprising:

selecting a second server as a backup server for the first server, wherein the second server is configured to maintain a copy of session state information associated with the communication session;

forwarding a packet from the client to the second server in response to a failure of the first server; and

reconstructing the communication session on the second server using the copy of the session state information.

11. The method of claim 1, further comprising:

sending an acknowledgment to the first server which responds first to the interest packet.

12. A system for facilitating network service virtualization, comprising:

a receiving mechanism configured to receive a service request from a client;

an extraction mechanism configured to extract session state information from the received service request, wherein the session state information facilitates identifying a previous communication session associated with the client;

a communication-session-initializing mechanism configured to initialize a communication session with the client;

an interest-construction mechanism configured to construct an interest packet, wherein the interest packet comprises a hierarchically structured variable-length name, and wherein the hierarchically structured variable-length name indicates the session state information;

a broadcasting mechanism configured to broadcast the interest packet to a number of servers; and

a forwarding mechanism configured to forward to the client data received from a first server which responds first to the interest.

13. The system of claim 12, further comprising a mechanism configured to disregard future responses from unselected servers.

14. The system of claim 12, wherein the forwarding mechanism is further configured to forward the data to the client over a transport control protocol (TCP) session, and wherein the interest packet includes a TCP session identifier.

15. The system of claim 14, wherein the session state information includes a hypertext transfer protocol (HTTP) cookie.

16. The system of claim 12, wherein the forwarding mechanism is further configured to forward the data to the client over a secure sockets layer (SSL) session.

17. The system of claim 16, wherein the session state information includes an SSL session identifier.

18. The system of claim 12, further comprising a packet-receiving mechanism configured to receive a packet responding to the service request from the first server, wherein corresponding session state information is embedded in a name of the packet, thereby facilitating the first server to receive future packets from the client for the communication session.

19. The system of claim 12, wherein the forwarding mechanism is further configured to forward a packet from the client to a second server, wherein the second server is configured to receive session state information associated with the communication session from the first server.

20. The system of claim 19, wherein the second server is configured to receive the session state information from the first server by:

broadcasting, from the second server to all servers, an interest for the session state information; and

receiving a response, from the first server, wherein the response contains the session state information associated with the communication session, thereby enabling the communication session to continue on the second server.

21. The system of claim 12, further comprising:

a backup mechanism configured to select a second server as a backup server for the first server, wherein the second server is configured to maintain a copy of session state information associated with the communication session; and

wherein the forwarding mechanism is further configured to forward a packet from the client to the second server in response to a failure of the first server; and

wherein the second server is configured to reconstruct the communication session using the copy of the session state information.

22. The system of claim 12, further comprising an acknowledgment mechanism configured to send an acknowledgment to the first server which responds first to the interest packet.

23. A non-transitory computer-readable storage device storing instructions that when executed by a computer cause the computer to perform a method for facilitating service virtualization, the method comprising:

receiving a service request from a client;

extracting session state information from the received service request, wherein the session state information facilitates identifying a previous communication session associated with the client;

initializing a communication session with the client;

constructing an interest packet, wherein the interest packet comprises a hierarchically structured variable-length name, and wherein the hierarchically structured variable-length name indicates the session state information;

broadcasting the interest packet to a number of servers; and

forwarding to the client data received from a first server which responds first to the interest.

24. The storage device of claim 23, wherein the method further comprises:

forwarding a packet from the client to a second server, wherein the second server is configured to receive session state information associated with the session from the first server.

25. The storage device of claim 24, wherein receiving the session state information from the selected first server comprises:

broadcasting, from the second server to all servers, an interest for the session state information; and

receiving a response, at the second server from the first server, wherein the response contains the session state information associated with the communication session, thereby enabling the communication session to continue on the second server.