Network Management System and Method for Performing Scalable Loss Measurements within an Access Network

• US 20090161566A1
• Filed: 12/13/2007
• Published: 06/25/2009
• Est. Priority Date: 12/13/2007
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Gerard, Damm, Sridhar, Kamakshi, Ooghe, Sven
• Granted Patent: US 8,102,778 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 12/2856 Access arrangements, e.g. Internet access asynchronous transfer mode networks H04L12/5601; broadband local area networks H04L12/2801; optical access or distribution networks H04Q11/0067; access to open networks H04L12/5691; digital subscriber line end-user equipment and bit-level processing of data on a PSTN-based network H04M11/00; home network gateways H04L12/2834; wireless access networks H04W
• CPC Class Codes: H04L 12/2878 Access multiplexer, e.g. DSLAM generic distributed time multiplexers, e.g. TDM/TDMA H04J3/1694
• CPC Class Codes: H04L 41/044 comprising hierarchical management structures
• CPC Class Codes: H04L 43/0829 Packet loss
• CPC Class Codes: H04L 43/12 Network monitoring probes
• CPC Class Codes: H04L 43/16 Threshold monitoring

Abstract

A network management system and a method are described herein that determine if one or more devices (e.g., consumer premises equipment(s)) are experiencing an unacceptable packet loss for downstream multicast traffic in an access network. In one embodiment, the network management system performs the following operations: (1) cause a trigger probe to be sent to the one or more devices, where each trigger probe contains information which causes the corresponding device to start a packet loss measurement; and (2) receive an unacceptable loss measurement message from one of the devices if that one device experienced packet losses over a certain period of time that exceeded a predetermined threshold which would be an indication that the one end device is experiencing an unacceptable packet loss.

Claims

1. A method for determining if one or more devices are experiencing an unacceptable packet loss for downstream multicast traffic in an access network, said method comprising the steps of:

causing a trigger probe to be sent to the one or more devices, wherein each trigger probe contains information which causes the corresponding device to start a packet loss measurement; and

receiving an unacceptable loss measurement message from one of the devices if that one device experienced packet losses over a certain period of time that exceeded a predetermined threshold which would be an indication that the one end device is experiencing an unacceptable packet loss.

2. The method of claim 1, wherein a network management system implements the causing step and the receiving step.

3. The method of claim 1, wherein said trigger probe is a multicast continuity check message which is sent by an edge router to all of the devices.

4. The method of claim 3, wherein said multicast continuity check message has an operational code field with contents that cause each of the devices to access an organization specific type-length-value field which contains the information that causes the corresponding device to start the packet loss measurement.

5. The method of claim 1, wherein said trigger probe is a unicast loopback message which is sent by an edge router to a selected one of the devices.

6. The method of claim 5, wherein said unicast loopback message has an operational code field with contents that cause the selected device to access an organization specific type-length-value field which contains the information that causes the selected device to start the packet loss measurement.

7. The method of claim 1, wherein said trigger probe is an Access Node Control Protocol message which is sent to a selected one of the devices.

8. The method of claim 1, wherein each device performs the packet loss measurement by accessing counters located within a plurality of received continuity check messages and comparing the counter contents within the plurality of received continuity check messages.

9. The method of claim 1, wherein each device is a line termination in a bridge-on-line card that is incorporated within an access node.

10. The method of claim 1, wherein each device is a consumer premises equipment.

11. A network management system, comprising:

a processor;

a memory; and

instructions which are accessible from said memory and processable by said processor to enable the following;

causing a trigger probe to be sent to the one or more devices, wherein each trigger probe contains information which causes the corresponding device to start a packet loss measurement; and

receiving an unacceptable loss measurement message from one of the devices if that one device experienced packet losses over a certain period of time that exceeded a predetermined threshold which would be an indication that the one end device is experiencing an unacceptable packet loss for downstream multicast traffic.

12. The network management system of claim 11, wherein said trigger probe is a multicast continuity check message which is sent by an edge router to all of the devices.

13. The network management system of claim 12, wherein said multicast continuity check message has an operational code field with contents that cause each of the devices to access an organization specific type-length-value field which contains the information that causes the corresponding device to start the packet loss measurement.

14. The network management system of claim 11, wherein said trigger probe is a unicast loopback message which is sent by an edge router to a selected one of the devices.

15. The network management system of claim 14, wherein said unicast loopback message has an operational code field with contents that cause the selected device to access an organization specific type-length-value field which contains the information that causes the selected device to start the packet loss measurement.

16. The network management system of claim 11, wherein said trigger probe is an Access Node Control Protocol message which is sent to a selected one of the devices.

17. An edge router, comprising:

a processor; and

a memory, where said processor retrieves instructions from said memory and processes those instructions to enable the following;

sending a trigger probe to one or more devices, wherein each trigger probe contains information which causes the corresponding device to start a packet loss measurement.

18. The edge router of claim 17, wherein said trigger probe is a multicast continuity check message which is sent to all of the devices, and wherein said multicast continuity check message has an operational code field with contents that cause each of the devices to access an organization specific type-length-value field which contains the information that causes the corresponding device to start the packet loss measurement.

19. The edge router of claim 17, wherein said trigger probe is a unicast loopback message which is sent to a selected one of the devices, and wherein said unicast loopback message has an operational code field with contents that cause the selected device to access an organization specific type-length-value field which contains the information that causes the selected device to start the packet loss measurement.

20. The edge router of claim 17, wherein said trigger probe is an Access Node Control Protocol message which is sent to a selected one of the devices.