System and method for discovering and verifying a hybrid fiber-coaxial topology in a cable network environment

Patent metadata

Field	Value
Publication number	US-9419862-B2
Application number	US-201514632474-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Jun 4, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A method in an example embodiment can include polling a first cable modem in a cable network and receiving a first response message from the first cable modem identifying a downstream frequency detected by the first cable modem. The method further includes determining the downstream frequency is split between at least two fiber nodes and determining a cable modem termination system (CMTS) service group topology, where the topology includes the at least two fiber nodes. In specific embodiments, determining that the downstream frequency is split is based on at least the first response message from the first cable modem and a second response message from a second cable modem. In more specific embodiments, the method includes constructing a hybrid fiber-coaxial (HFC) topology map of the cable network based on at least the first and second response messages, where the HFC topology map indicates the CMTS service group topology.

First claim

What is claimed is:

1. A method for verifying a hybrid fiber-coaxial (“HFC”) topology map of a Cable Modem Termination System (“CMTS”) comprising a plurality of cable modems, the method comprising:
evaluating the HFC topology map to identify frequencies associated with a selected one of the cable modems, wherein the HFC topology map is stored in a storage device of the CMTS;
communicating a dynamic channel change request to the cable modem for each of the associated frequencies;
receiving a response message from the cable modem for each of the channel change requests; and
when any one of the response messages indicates a failed attempt by the cable modem to change to a requested channel, taking an action comprising one of sending an alert to an administrator, logging a possible topology error, and taking the cable modem off-line.

2. The method of claim 1 , wherein the frequencies include at least one downstream frequency and at least one upstream frequency.

3. The method of claim 1 , wherein the communicating comprises sending a DOCSIS 3.0 command to the identified cable modem for each of the associated frequencies.

4. The method of claim 1 , further comprising obtaining a topology map from a cable modem termination system (“CMTS”).

5. The method of claim 4 further comprising determining a portion of the topology to verify.

6. An apparatus, comprising:
a memory element configured to store data;
a processor operable to execute instructions associated with the data; and
a cable modem identifier module configured to interface with the memory element and the processor, wherein the apparatus is configured to verify a hybrid fiber-coaxial (“HFC”) topology map of a Cable Modem Termination System (“CMTS”) comprising a plurality of cable modems, the apparatus further configured to:
evaluate the HFC topology map to identify frequencies associated with a selected one of the cable modems, wherein the HFC topology map is stored in a storage device of the CMTS;
communicate a dynamic channel change request to the cable modem for each of the associated frequencies;
receive a response message from the cable modem for each of the channel change requests; and
when any one of the response messages indicates a failed attempt by the cable modem to change to a requested channel, take an action comprising one of sending an alert to an administrator, logging a possible topology error, and taking the cable modem off- line.

7. The apparatus of claim 6 , wherein the frequencies include at least one downstream frequency and at least one upstream frequency.

8. The apparatus of claim 6 , wherein the communicating comprises sending a DOCSIS 3.0 command to the identified cable modem for each of the associated frequencies.

9. The apparatus of claim 6 , wherein the apparatus is further configured to obtain a topology map from a cable modem termination system (“CMTS”).

10. The apparatus of claim 9 , wherein the apparatus is further configured to determine a portion of the topology to verify.

11. Logic encoded in non-transitory computer-readable media that includes code for execution and when executed by a processor is operable to perform operations comprising:
evaluating the HFC topology map to identify frequencies associated with a selected one of the cable modems, wherein the HFC topology map is stored in a storage device of the CMTS;
communicating a dynamic channel change request to the cable modem for each of the associated frequencies;
receiving a response message from the cable modem for each of the channel change requests; and
when any one of the response messages indicates a failed attempt by the cable modem to change to a requested channel, taking an action comprising one of sending an alert to an administrator, logging a possible topology error, and taking the cable modem off-line.

12. The logic of claim 11 , wherein the frequencies include at least one downstream frequency and at least one upstream frequency.

13. The logic of claim 11 , wherein the communicating comprises sending a DOCSIS 3.0 command to the identified cable modem for each of the associated frequencies.

14. The logic of claim 11 , wherein the operations further comprise obtaining a topology map from a cable modem termination system (“CMTS”).

15. The logic of claim 14 , wherein the operations further comprise determining a portion of the topology to verify.

Assignees

• Cisco Tech Inc

Inventors

• Asati Rajiv
• Bernstein Alon
• Chapman John T

Classifications

• H04L41/12 Primary

  Discovery or management of network topologies · CPC title

• H04L12/2801

  Broadband local area networks · CPC title

• H04B3/46

  Monitoring; Testing · CPC title

• H04L41/0853

  by actively collecting configuration information or by backing up configuration information · CPC title

• H04B10/27

  Arrangements for networking · CPC title