Automatic filter overlap processing and related systems and methods

• US 8,902,895 B2
• Filed: 09/08/2011
• Issued: 12/02/2014
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Keysight Technologies Singapore (Holdings) Pte. Limited. (Keysight Technologies, Inc.)
• Original Assignee: ANUE Systems (Keysight Technologies, Inc.)
• Inventors: Pleshek, Ronald A., Webb, Charles A. III, Cheney, Keith E., Hilton, Gregory S., Abkowitz, Patricia A., Thakkar, Arun K., Thaker, Himanshu M.
• Primary Examiner(s): Sam, Phirin
• Application Number:
  US13/227,617
• Publication Number:
  US 20110317694A1
• Time in Patent Office: 1,181 Days
• Field of Search: None
• US Class Current: 370/392
• CPC Class Codes: H04L 43/028 by filtering
• CPC Class Codes: H04L 45/306 Route determination based on the nature of the carried application
• CPC Class Codes: H04L 49/90 Buffering arrangements

Abstract

Systems and methods are disclosed that allow for improved management and control of packet forwarding in network systems. Network devices and tool optimizers and a related systems and methods are disclosed for improved packet forwarding between input ports and output ports. The input ports and output ports are configured to be connected to source devices and destination devices, for example, network sources and destination tools in a network monitoring environment. The network devices and tool optimizers disclosed can use a packet processing system whereby forwarding behavior is governed by matching packets in parallel against multiple user-specified packet filtering criteria, and by performing forwarding actions associated with all such matching filter criteria. The multi-action packet forwarding can be implemented using hardware configured to directly provide multi-action packet forwarding and/or hardware configured to provide single-packet-forwarding that has been subsequently configured using filter engines to provide multi-action packet forwarding.

Claims

1. A network packet forwarding device having automatic filter overlap processing, comprising:

one or more input ports configured to receive packets from one or more source devices;

a plurality of output ports configured to send packets to two or more destination devices;

packet forwarding circuitry coupled between the input ports and the output ports and configured to forward packets from the input ports to the output ports;

at least one filter engine coupled to the packet forwarding circuitry and configured to use filter rules to control at least in part how packets are forwarded by the packet forwarding circuitry from the input ports to the output ports;

a filter interface configured to allow a user to define a plurality of filters representing how packets are desired to be forwarded from input ports to output ports; and

a dynamic filter processor configured to analyze the user-defined filters, to automatically identify filters having different forwarding actions for packets from a single input port as overlapping filters, to automatically generate filter rules for the filter engine to provide for the different forwarding actions, and to automatically apply the filter rules to the filter engine so that the filter engine is configured to cause packets from the single input port to be forwarded according to the different forwarding actions provided by the overlapping filters.

2. The network packet forwarding device of claim 1, wherein the at least one filter engine comprises a multi-action filter engine configured to directly cause packets from the single input port to be forwarded according to the different forwarding actions provided by the overlapping filters.

3. The network packet forwarding device of claim 2, wherein the multi-action filter engine comprises a plurality of individual filter match engines, each configured to provide a least one forwarding action per packet, and a combiner coupled to receive and combine the forwarding actions from the plurality of individual filter match engines so that the multi-action filter engine is configured to directly cause packets from the single input port to be forwarded according to the different forwarding actions provided by the overlapping filters.

4. The network packet forwarding device of claim 3, wherein the combiner is configured to combine the forwarding actions received from the individual filter match engines using a Boolean OR operation.

5. The network packet forwarding device of claim 1, wherein the dynamic filter processor is configured to automatically generate the filter rules regardless of an order in which a user defines the overlapping filters.

6. The network packet forwarding device of claim 1, wherein the filter interface is configured to allow a user to define the filters using filter parameters and desired connection paths to input ports and output ports.

7. The network packet forwarding device of claim 1, wherein the dynamic filter processor is configured to treat a filter connected to N input ports as a set of N filters for purposes of generating the filter rules.

8. The network packet forwarding device of claim 1, wherein the interface is configured to be accessed through one or more management platforms by a plurality of users at the same time.

9. The network packet forwarding device of claim 1, wherein the packets comprise a plurality of fields, each field having one or more values, and wherein the interface is configured to allow the user to define filters using filter parameters associated with the fields and values.

10. The network packet forwarding device of claim 1, wherein the interface is configured to allow the user to manually adjust filter rules automatically generated for the filter engine.

11. The network packet forwarding device of claim 1, wherein the source devices comprise network monitoring sources and the destination devices comprise network monitoring tools.

20. The network packet forwarding device of claim 9, wherein filters are determined to be overlapping filters only if values within one or more fields for the packets can match filter parameters within each of the filters.

12. A method for automatic filter overlap processing, comprising:

providing one or more input ports configured to receive packets from one or more source devices;

providing a plurality of output ports configured to send packets to two or more destination devices;

forwarding packets between the input ports and the output ports using packet forwarding circuitry;

controlling the packet forwarding using at least one filter engine configured to use filter rules to control at least in part how packets are forwarded by the packet forwarding circuitry from the input ports to the output ports;

allowing a user to define through an interface a plurality of filters representing how packets are desired to be forwarded from input ports to output ports;

analyzing the user-defined filters;

automatically identifying filters having different forwarding actions for packets from a single input port as overlapping filters;

automatically generating filter rules for the filter engine to provide for the different forwarding actions;

automatically applying the filter rules to the filter engine so that the filter engine is configured to cause packets from the single input port to be forwarded according to the different forwarding actions provided by the overlapping filters; and

forwarding packets according to the user-defined filters.

13. The method of claim 12, wherein the controlling step comprises using a multi-action filter engine to directly cause packets from the single input port to be forwarded according to the different forwarding actions provided by the overlapping filters.

14. The method of claim 13, further comprising providing a plurality of individual filter match engines for the multi-action filter engine, each configured to provide a least one forwarding action per packet, and combining the forwarding actions from the plurality of individual filter match engines so that the multi-action filter engine is configured to directly cause packets from the single input port to be forwarded according to the different forwarding actions provided by the overlapping filters.

15. The method of claim 14, further comprising combining the forwarding actions received from the individual filter match engines using a Boolean OR operation.

16. The method of claim 12, wherein the automatically generating step is configured to automatically generate the filter rules regardless of an order in which a user defines the overlapping filters.

17. The method of claim 12, further comprising treating a filter connected to N source ports as a set of N filters for purposes of generating the filter rules.

18. The method of claim 12, wherein the allowing step comprises allowing a plurality of users to access the interface through one or more management platforms at the same time.

19. The method of claim 12, wherein the packets comprise a plurality of fields, each field having one or more values, and wherein the allowing step comprising allowing the user to define filters using filter parameters associated with the fields and values.

21. The method of claim 19, wherein filters are determined to be overlapping filters only if values within one or more fields for the packets can match filter parameters within each of the filters.