Network monitoring using a proxy

• US 7,808,919 B2
• Filed: 03/18/2008
• Issued: 10/05/2010
• Est. Priority Date: 03/18/2008
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Aldrin, Sam, Sayeed, Mohammed, Nadeau, Thomas David
• Primary Examiner(s): Duong; Frank
• Application Number:
  US12/077,487
• Publication Number:
  US 20090238084A1
• Time in Patent Office: 931 Days
• Field of Search: 370241-250, 370/351, 370/389, 3703951-397, 3703955-39552, 370/401
• US Class Current: 370/248
• CPC Class Codes: H04L 41/0213 Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 43/026 using flow identification
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route

Abstract

A method and apparatus for network monitoring using a proxy are disclosed. In one embodiment, a method generally comprises receiving at a proxy, path information for a label switched path (LSP) from a forwarding device located in the LSP, generating a connectivity verification message based on the path information, adding a proxy label to the connectivity verification message, and transmitting the connectivity verification message to the forwarding device. The proxy label is configured to inject the connectivity verification message into a forwarding plane at the forwarding device and the connectivity verification message is configured for transmittal from the forwarding device over the LSP to a destination node to verify a forwarding path associated with the path information received from the forwarding device.

Claims

1. A method comprising:

receiving at a proxy, path information for a label switched path (LSP) from a forwarding device located in said LSP, the proxy and the forwarding device utilizing separate processors;

generating at the proxy, a connectivity verification message based on said path information;

adding a proxy label to said connectivity verification message at the proxy, said proxy label configured to inject said connectivity verification message into a forwarding plane at the forwarding device; and

transmitting said connectivity verification message from the proxy to the forwarding device;

wherein said connectivity verification message is configured for transmittal from the forwarding device over said LSP to a destination node to verify a forwarding path associated with the path information received from the forwarding device.

2. The method of claim 1 wherein receiving path information comprises receiving NetFlow packet data.

3. The method of claim 1 further comprising:

selecting an operation for said forwarding device;

mapping said operation to said proxy label; and

transmitting said mapping to the forwarding device.

4. The method of claim 3 wherein said operation comprises removing said proxy label and forwarding said connectivity verification message.

5. The method of claim 1 wherein said path comprises a pseudowire traversing a core network.

6. The method of claim 5 wherein said proxy label comprises a Virtual Circuit Connectivity Verification (VCCV) channel type configured for use by a remote forwarding device in the core network.

7. The method of claim 1 wherein said LSP comprises a Multi-Protocol Label Switching (MPLS) Traffic Engineering LSP.

8. The method of claim 1 wherein said connectivity verification message comprises an LSP ping.

9. The method of claim 1 wherein the forwarding device is a provider edge router in a Multi-Protocol Label Switching (MPLS) network.

10. The method of claim 1 further comprising receiving at the proxy, a response to said connectivity verification message, said response comprising a packet generated at a remote proxy.

11. The method of claim 1 further comprising receiving

a second connectivity verification message from the forwarding device,

generating a response to said second connectivity verification message, and

transmitting said response to the forwarding device for forwarding on said LSP.

12. An apparatus comprising:

a processor configured for receiving path information for a label switched path (LSP) from a forwarding device located in said LSP, generating a connectivity verification message based on said path information, adding a proxy label to said connectivity verification message, said proxy label configured to inject said connectivity verification message into a forwarding plane at the forwarding device, and transmitting said connectivity verification message to the forwarding device, the processor separate from a processor used by the forwarding device; and

memory for storing said path information;

wherein said connectivity verification message is configured for transmittal from the forwarding device over said LSP to a destination node to verify a forwarding path associated with the path information received from the forwarding device.

13. The apparatus of claim 12 wherein the processor is further configured to select an operation for said forwarding device, map said operation to said proxy label, and transmit said mapping to the forwarding device.

14. The apparatus of claim 12 wherein said proxy label comprises a Virtual Circuit Connectivity Verification (VCCV) channel type configured for use by a remote forwarding device.

15. The apparatus of claim 12 the forwarding device is a provider edge router in a Multi-Protocol Label Switching (MPLS) network.

16. The apparatus of claim 12 wherein the processor is further configured for receiving a response to said connectivity verification message, said response comprising a packet generated at a remote proxy.

17. An apparatus comprising:

means for receiving at a proxy, path information for a label switched path (LSP) from a forwarding device located in said LSP, the proxy and the forwarding device configured for utilizing separate processors;

means for generating at the proxy, a connectivity verification message based on said path information;

means for adding at the proxy, a proxy label to said connectivity verification message, said proxy label configured to inject said connectivity verification message into a forwarding plane at the forwarding device; and

means for transmitting said connectivity verification message from the proxy to the forwarding device;

wherein said connectivity verification message is configured for transmittal from the forwarding device over said LSP to a destination node to verify a forwarding path associated with the path information received from the forwarding device.

18. The apparatus of claim 17 further comprising means for selecting an operation for said forwarding device, mapping said operation to said proxy label, and transmitting said mapping to the forwarding device.

19. The apparatus of claim 17 wherein said proxy label comprises a Virtual Circuit Connectivity Verification (VCCV) channel type configured for use by a remote forwarding device.

20. The apparatus of claim 17 further comprising means for receiving a response to said connectivity verification message, said response comprising a packet generated at a remote proxy.