Synchronizing service instructions among forwarding agents using a service manager

• US 6,909,724 B1
• Filed: 07/18/2003
• Issued: 06/21/2005
• Est. Priority Date: 07/02/1999
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Jordon, James A., Albert, Mark, Tiwari, Pranav Kumar, O'Rourke, Chris, Menditto, Louis F., Howes, Richard A., Tsang, Tzu-Ming, Kersey, Edward A.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US10/623,298
• Time in Patent Office: 704 Days
• Field of Search: 370/465, 370385-396, 370/400, 370401-409, 370/467, 370/352, 370/351, 370230-235, 709/238, 709/223, 709/245, 709/240
• US Class Current: 370/465
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/38 Flow based routing
• CPC Class Codes: H04L 49/25 Routing or path finding in a switch fabric
• CPC Class Codes: H04L 49/602 Multilayer or multiprotocol switching, e.g. IP switching

Abstract

A method of obtaining instructions for routing a packet is described that includes receiving a packet having a packet flow identifier that includes a packet source IP address, a packet destination IP address, a packet source port, and a packet destination port and checking whether the packet flow identifier matches a stored instruction. If the packet flow identifier does not match a stored instruction, whether the packet flow identifier matches a stored criteria is checked and if the packet matches a stored criteria, the packet is forwarded to a service manager.

Claims

1. A method for synchronizing packet handling instructions, comprising:

receiving a fixed filter specifying a packet flow;

receiving a packet having a flow identifier;

determining whether the flow identifier corresponds to the fixed filter;

handling the packet according to the fixed filter in response to the flow identifier corresponding to the fixed filter; and

discarding the fixed filter after a predetermined period of time.

2. The method of claim 1, further comprising:

forwarding the packet in response to the flow identifier not corresponding to the fixed filter.

3. The method of claim 2, further comprising:

receiving an action filter for the packet with the flow identifier not corresponding to the fixed filter, the action filter indicating how the packet is to be processed.

4. The method of claim 3, further comprising:

handling the packet according to the action filter.

5. The method of claim 4, further comprising:

discarding the action filter after a predetermined period of time.

6. The method of claim 1, wherein the flow identifier includes at least one of a source address, a destination address, a source port, a destination port, and a protocol.

7. The method of claim 1, wherein the fixed filter is associated with one transport direction of the packet flow.

8. The method of claim 1, further comprising:

receiving a wildcard filter specifying another packet flow;

determining whether the flow identifier corresponds to the fixed filter or the wildcard filter;

handling the packet according to one of the fixed filter and the wildcard filter, the fixed filter having a priority over the wildcard filter.

9. The method of claim 1, wherein the packet flow specified by the fixed filter has been load balanced through a network.

10. A system for synchronizing packet handling instructions, comprising:

means for receiving a fixed filter specifying a packet flow;

means for receiving a packet having a flow identifier;

means for determining whether the flow identifier corresponds to the fixed filter;

means for handling the packet according to the fixed filter in response to the flow identifier corresponding to the fixed filter; and

means for discarding the fixed filter after a predetermined period of time.

11. The system of claim 10, further comprising:

means for forwarding the packet in response to the flow identifier not corresponding to the fixed filter.

12. The system of claim 11, further comprising:

means for receiving an action filter for the packet with the flow identifier not corresponding to the fixed filter.

13. The system of claim 12, further comprising:

means for handling the packet according to the action filter.

14. The system of claim 10, wherein the flow identifier includes at least one of a source address, a destination address, a source port, a destination port, and a protocol.

15. A computer readable medium including code for synchronizing packet handling instructions, the code operable to:

receive a fixed filter specifying a packet flow;

receive a packet having a flow identifier;

determine whether the flow identifier corresponds to the fixed filter;

handle the packet according to the fixed filter in response to the flow identifier corresponding to the fixed filter; and

discard the fixed filter after a predetermined period of time.

16. The computer readable medium of claim 15, wherein the code is further operable to:

forward the packet in response to the flow identifier not corresponding to the fixed filter.

17. The computer readable medium of claim 16, wherein the code is further operable to:

receive an action filter for the packet with the flow identifier not corresponding to the fixed filter.

18. The computer readable medium of claim 17, wherein the code is further operable to:

handle the packet according to the action filter.

19. The computer readable medium of claim 15, wherein the flow identifier includes at least one of a source address, a destination address, a source port, a destination port, and a protocol.

20. A device for synchronizing packet handling instructions, comprising:

a forwarding agent operable to receive a fixed filter specifying a packet flow, the forwarding agent operable to receive a packet having a flow identifier, the forwarding agent operable to determine whether the flow identifier corresponds to the fixed filter, the forwarding agent operable to handle the packet according to the fixed filter in response to the flow identifier corresponding to the fixed filter, wherein the fixed filter is discarded after a predetermined period of time.

21. The device of claim 20, wherein the forwarding agent is further operable to forward the packet in response to the flow identifier not corresponding to the fixed filter.

22. The device of claim 21, wherein the forwarding agent is further operable to receive an action filter for the packet with the flow identifier not corresponding to the fixed filter.

23. The device of claim 22, wherein the forwarding agent is further operable to handle the packet according to the action filter.

24. The device of claim 20, wherein the flow identifier includes at least one of a source address, a destination address, a source port, a destination port, and a protocol.