Selective reestablishment of cable modem internet protocol connectivity

• US 9,479,353 B2
• Filed: 10/13/2011
• Issued: 10/25/2016
• Est. Priority Date: 10/13/2011
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Meng, Jie, Dong, Wenwen, Chen, Shuzhan, Huang, Rundong
• Primary Examiner(s): Chea, Philip
• Assistant Examiner(s): Ma, Wing
• Application Number:
  US13/272,798
• Publication Number:
  US 20130097324A1
• Time in Patent Office: 1,839 Days
• Field of Search: 709/227
• US Class Current: 1/1
• CPC Class Codes: H04L 12/2801 Broadband local area networks

Abstract

Techniques are generally directed to selective reestablishment of Internet Protocol (IP) connectivity between a cable modem and a cable modem termination system (CMTS). IP connectivity between the cable modem and the CMTS is initially established through execution of a plurality of connectivity steps. After IP connectivity is lost, the cable modem determines which of the plurality of connectivity steps are desired for use in reestablishing IP connectivity, and sends a message to the CMTS indicating the desired IP connectivity step. The CMTS determines if the desired connectivity steps identified in the message may be used to reestablish IP connectivity, and sends a response message to the cable modem indicating if the desired connectivity steps may be used. IP connectivity is then reestablished using at least the desired connectivity steps.

Claims

1. A method comprising:

initially establishing Internet Protocol connectivity between a cable modem and a cable modem termination system through execution of a plurality of connectivity steps;

when Internet Protocol connectivity between the cable modem and the cable modem termination system is lost, evaluating, at the cable modem, information received by the cable modem during the initial establishment of Internet Protocol connectivity to determine whether any of the received information may be used for future operations;

determining, at the cable modem based on the evaluating, to reuse an Internet Protocol address obtained when initially establishing the Internet Protocol connectivity and to skip a connectivity step of acquisition of the Internet Protocol address;

determining selected one or more of the plurality of connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity of the cable modem;

sending a message from the cable modem to the cable modem termination system, wherein the message is encoded to indicate that the connectivity step of acquisition of the Internet Protocol address is to be skipped and to identify the selected one or more connectivity steps other than acquisition of the Internet Protocol address determined by the cable modem for use in reestablishing Internet Protocol connectivity;

receiving, from the cable modem termination system, a message indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity; and

reestablishing Internet Protocol connectivity between the cable modem and the cable modem termination system using the Internet Protocol address obtained when initially establishing the Internet Protocol connectivity and the selected one or more connectivity steps other than acquisition of the Internet Protocol address.

2. The method of claim 1, wherein receiving the message indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity further comprises:

receiving a message indicating that the selected one or more connectivity steps other than acquisition of the Internet Protocol address and one or more additional connectivity steps are to be used by the cable modem in reestablishing Internet Protocol connectivity with the cable modem termination system.

3. The method of claim 1, wherein determining the selected one or more connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity comprises:

determining that a subset of the plurality of connectivity steps other than acquisition of the Internet Protocol address are desired.

4. The method of claim 1, wherein the plurality of connectivity steps for initially establishing Internet Protocol connectivity comprise:

(a) obtaining the Internet Protocol address for the cable modem;

(b) obtaining a current date and time; and

(c) downloading a configuration file for the cable modem.

5. The method of claim 4, wherein determining the selected one or more connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity comprises:

determining that at least one of connectivity steps (b), or (c) is to be skipped during re-registration of the cable modem when reestablishing Internet Protocol connectivity.

6. The method of claim 4, wherein determining the selected one or more connectivity steps other than acquisition of the Internet Protocol address for use in reestablishment of the Internet Protocol connectivity comprises:

determining that connectivity steps (b), and (c) are to be performed during reestablishment of the Internet Protocol connectivity.

7. The method of claim 4, wherein determining to reuse the Internet Protocol address obtained when initially establishing the Internet Protocol connectivity and to skip the connectivity step of acquisition of the Internet Protocol address comprises:

determining that the Internet Protocol address received during initial establishment of the Internet Protocol connectivity is still valid.

8. The method of claim 7, further comprising:

determining that connectivity step (b) is also to be skipped during reestablishment of the Internet Protocol connectivity.

9. The method of claim 7, further comprising:

determining that a configuration file for the cable modem received during initial establishment of the Internet Protocol connectivity is not valid and that connectivity step (c) is to be performed during reestablishment of the Internet Protocol connectivity.

10. The method of claim 7, further comprising:

determining that connectivity steps (b) and (c) are both to be performed when reestablishing Internet Protocol connectivity.

11. The method of claim 1, wherein sending a message to the cable modem termination system indicating the connectivity step of acquisition of the Internet Protocol address to be skipped and the selected one or more connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity comprises:

sending an encoded ranging request.

12. A method comprising:

initially establishing Internet Protocol connectivity between a cable modem and a cable modem termination system through execution of a plurality of connectivity steps;

when Internet Protocol connectivity between the cable modem and the cable modem termination system is lost, receiving a message from the cable modem, wherein the message is encoded to indicate that the connectivity step of acquisition of the Internet Protocol address is to be skipped and to identify selected one or more of the plurality of connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity, wherein the selected one or more connectivity steps other than acquisition of the Internet Protocol address were identified by the cable modem by evaluating information received by the cable modem during the initial establishment of Internet Protocol connectivity to determine that the Internet Protocol address obtained when initially establishing the Internet Protocol connectivity is to be re-used and a connectivity step of acquisition of the Internet Protocol address is to be skipped for reestablishing Internet Protocol connectivity between the cable modem and the cable modem termination system;

determining whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used to reestablish Internet Protocol connectivity;

sending a message to the cable modem indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity; and

reestablishing Internet Protocol connectivity between the cable modem and the cable modem termination system using the Internet Protocol address obtained when initially establishing the Internet Protocol connectivity and the selected one or more connectivity steps other than acquisition of the Internet Protocol address.

13. The method of claim 12, wherein sending the message indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity further comprises:

sending a message indicating that the selected one or more connectivity steps other than acquisition of the Internet Protocol address and one or more additional connectivity steps are to be used in reestablishing Internet Protocol connectivity.

14. The method of claim 12, wherein after Internet Protocol connectivity with the cable modem is lost, receiving a message from the cable modem indicating that a subset of the plurality of connectivity steps other than acquisition of the Internet Protocol address are selected for use reestablishing Internet Protocol connectivity, and wherein determining comprises:

determining whether execution of the subset of the plurality of connectivity steps other than acquisition of the Internet Protocol address will result in correct reestablishment of Internet Protocol connectivity.

15. The method of claim 12, wherein the plurality of connectivity steps for initially establishing Internet Protocol connectivity comprise:

(a) forwarding the Internet Protocol address to the cable modem;

(b) forwarding a current date and time to the cable modem; and

(c) forwarding a configuration file to the cable modem.

16. The method of claim 12, wherein sending the message to the cable modem indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity comprises:

sending an encoded ranging response.

17. The method of claim 13, wherein sending the message to the cable modem indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity comprises:

sending a message indicating that a subset of the plurality of connectivity steps other than acquisition of the Internet Protocol address used to initially establish Internet Protocol activity are to be executed to reestablish Internet Protocol connectivity.

18. An apparatus comprising:

at least one radio-frequency (RF) interface;

at least one network interface;

a memory; and

a processor that;

initially establishes Internet Protocol connectivity with a cable modem termination system through execution of a plurality of connectivity steps,

when Internet Protocol connectivity with the cable modem termination system is lost, evaluates information received during the initial establishment of Internet Protocol connectivity to determine whether any of the received information may be used for future operations;

determines to reuse an Internet Protocol address obtained when initially establishing the Internet Protocol connectivity and to skip a connectivity step of acquisition of the Internet Protocol address;

determines selected one or more of the plurality of connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity with the cable modem termination system,

causes a message to be sent to the cable modem termination system, wherein the message is encoded to indicate that the connectivity step of acquisition of the Internet Protocol address is to be skipped and to identify the selected one or more connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity,

receives, from the cable modem termination system, a message indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity, and

reestablishes Internet Protocol connectivity with the cable modem termination system using the Internet Protocol address obtained when initially establishing the Internet Protocol connectivity and the selected one or more connectivity steps other than acquisition of the Internet Protocol address.

19. The apparatus of claim 18, wherein the message indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity comprises an indication that the selected one or more connectivity steps other than acquisition of the Internet Protocol address and one or more additional connectivity steps are to be used in reestablishing Internet Protocol connectivity.

20. The apparatus of claim 18, wherein the plurality of connectivity steps for initially establishing Internet Protocol connectivity comprise (a) obtaining the Internet Protocol address for the cable modem, (b) obtaining a current date and time, and (c) downloading a configuration file, wherein the processor is configured to determine that at least one of connectivity steps (b), or (c) is to be skipped during re-registration when reestablishing Internet Protocol connectivity.

21. The apparatus of claim 20, wherein the processor determines that the Internet Protocol address received during initial establishment of the Internet Protocol connectivity is still valid.

22. The apparatus of claim 20, wherein the processor determines that connectivity step (b) is also to be skipped during reestablishment of the Internet Protocol connectivity.

23. The apparatus of claim 20, wherein the processor determines that a configuration file received during initial establishment of the Internet Protocol connectivity is not valid and that connectivity step (c) is to be performed during reestablishment of the Internet Protocol connectivity.

24. The apparatus of claim 20, wherein the processor determines that connectivity steps (b) and (c) are both to be performed when reestablishing Internet Protocol connectivity.

25. An apparatus comprising:

at least one radio-frequency (RF) interface;

at least one network interface;

a memory; and

a processor that;

initially establishes Internet Protocol connectivity between a cable modem and a cable modem termination system through execution of a plurality of connectivity steps,

when Internet Protocol connectivity between the cable modem and the cable modem termination system is lost, receives a message from the cable modem indicating that the connectivity step of acquisition of the Internet Protocol address is to be skipped and identifying selected one or more of the plurality of connectivity steps other than acquisition of the Internet Protocol address for use in reestablishing Internet Protocol connectivity, wherein the selected one or more connectivity steps other than acquisition of the Internet Protocol address were identified by evaluating information received by the cable modem during the initial establishment of Internet Protocol connectivity to determine that the Internet Protocol address obtained when initially establishing the Internet Protocol connectivity is to be re-used and a connectivity step of acquisition of the Internet Protocol address is to be skipped for re-establishing Internet Protocol connectivity between the cable modem and the cable modem termination system,

determines whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used to reestablish Internet Protocol connectivity,

causes a message to be sent to the cable modem indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and that the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in reestablishing Internet Protocol connectivity; and

reestablishes Internet Protocol connectivity between the cable modem and the cable modem termination system using the Internet Protocol address obtained when initially establishing the Internet Protocol connectivity and the selected one or more connectivity steps other than acquisition of the Internet Protocol address.

26. The apparatus of claim 25, wherein the message indicating whether the connectivity step of acquisition of the Internet Protocol address may be skipped and the selected one or more connectivity steps other than acquisition of the Internet Protocol address may be used in in reestablishing Internet Protocol connectivity comprises an indication that the selected one or more connectivity steps other than acquisition of the Internet Protocol address and one or more additional connectivity steps are to be used in reestablishing Internet Protocol connectivity.

27. The apparatus of claim 25, wherein after Internet Protocol connectivity with the cable modem is lost, the processor receives a message from the cable modem indicating that a subset of the plurality of connectivity steps other than acquisition of the Internet Protocol address are selected for use reestablishing Internet Protocol connectivity, and determines whether execution of the subset of connectivity steps other than acquisition of the Internet Protocol address will result in correct reestablishment of Internet Protocol connectivity.

28. The apparatus of claim 26, wherein the processor causes a message to be sent that indicates that a subset of the plurality of connectivity steps other than acquisition of the Internet Protocol address used to initially establish Internet Protocol activity are to be executed to reestablish Internet Protocol connectivity.