Method and apparatus for normalizing service level agreements in a network

• US 7,400,580 B1
• Filed: 12/30/2002
• Issued: 07/15/2008
• Est. Priority Date: 12/30/2002
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Dhingra, Anurag, Synnestvedt, Robert, Venkataramu, Harsha
• Primary Examiner(s): Pham; Chi
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US10/334,969
• Time in Patent Office: 2,024 Days
• Field of Search: 370/230, 370/235, 370/241, 370/250, 370/252, 370/230.1, 709/223, 709/224, 709/225
• US Class Current: 370/230
• CPC Class Codes: H04L 41/0893 Assignment of logical groups to network elements
• CPC Class Codes: H04L 41/0894 Policy-based network configuration management
• CPC Class Codes: H04L 41/5003 Managing SLA; Interaction between SLA and QoS
• CPC Class Codes: H04L 41/5006 Creating or negotiating SLA contracts, guarantees or penalties

Abstract

This disclosure provides a method and apparatus for normalizing service level agreements across entire networks. By utilizing a new parameter called the virtual call count, a wholesale network provider can monitor a variety of related network status indications and provide to their customers increased insight into the nature of the service level rejections that they experience. Existing service level agreement processors can be equipped with the additional functionality of calculating the virtual call count to form an apparatus for normalizing service level agreements.

Claims

1. A network device that manages a service level agreement comprising:

a first counter to store a number of current active sessions, up to an active session limit;

a second counter to store a virtual call count, defined as the number of current active sessions that would exist if there were no active session limit; and

a processor to calculate a plurality of parameters for the service level agreement using the active session limit and the virtual call count, and to accept and reject requests based upon the active session limit for the service level agreement.

2. The device of claim 1, wherein the processor is further to decrease the virtual call count by one whenever an elapsed time from when a request is rejected exceeds a predetermined duration.

14. The device of claim 1, wherein the processor is further to divide a number of rejected requests during a selected period of time by a total number of requests during the selected period of time.

3. A network that manages a service level agreement comprising:

a first counter to store a number of current active sessions, up to an active session limit;

a second counter to store a virtual call count, defined as the number of current active sessions that would exist if there were no active session limit;

a processor to calculate a plurality of parameters for the service level agreement using the active session limit and the number of rejected requests, and to accept and reject requests based upon the active session limit for the service level agreement; and

wherein the processor is further to

decrease the virtual call count by one whenever an elapsed time from when a request is rejected exceeds a predetermined duration,

divide the virtual call count by the active session limit, and

subtract the active session limit from the virtual call count.

4. The device of claim 3, wherein the processor is further to divide a number of rejected requests during a selected period of time by a total number of requests during the second selected period of time.

5. The device of claim 3, wherein the processor is further to output the plurality of parameters to a display device.

6. An apparatus comprising:

means for storing a number of current active sessions, up to an active session limit,

means for storing a virtual call count, defined as the number of current active sessions that would exist if there were no active session limit; and

means for calculating a plurality of parameters for a service level agreement using the active session limit and the virtual call count, and for accepting and rejecting requests based upon the active session limit for the service level agreement;

wherein the means for calculating the plurality of parameters decreases the virtual call count by one whenever an elapsed time from when a request is rejected exceeds a predetermined duration, divides the virtual call count by the active session limit, and subtracts the active session limit from the virtual call count.

7. The apparatus of claim 6, wherein the means for calculating the plurality of parameters further divides a number of rejected requests during a selected period of time by a total number of requests during the selected period of time.

8. The apparatus of claim 6, wherein the means for calculating the plurality of parameters outputs the plurality of parameters to a display device.

9. A method comprising:

storing a number of current active sessions, tip to an active session limit;

storing a virtual call count, defined as the number of current active sessions that would exist if there were no active session limit;

calculating a plurality of parameters for a service level agreement using the active session limit and the virtual call count, and

accepting and rejecting requests based upon the active session limit for the service level agreement;

wherein storing a virtual call count further comprises;

decreasing the virtual call count by one whenever an elapsed time from when a request is rejected exceeds a predetermined duration; and

wherein calculating the plurality of parameters further comprises;

dividing the virtual call count by the active session limit, and

subtracting the active session limit from the virtual call count.

10. The method of claim 9, wherein calculating the plurality of parameters further comprises:

dividing a number of rejected requests during a selected period of time by a total number of requests during the selected period of time.

11. The method of claim 9, calculating the plurality of parameters further comprises outputting the plurality of parameters to a display device.

12. A machine-readable medium comprising machine-readable code which, when read, causes a network device to:

store a number of current active sessions, up to an active session limit;

store a virtual call count, defined as the number of current active sessions that would exist if there were no active session limit;

calculate a plurality of parameters for a service level agreement using the active session limit and the virtual call count;

accept and reject requests based upon the active session limit set forth in the service level agreement;

decrease the virtual call count by one whenever an elapsed time from when a request is rejected exceeds a predetermined call duration;

divide the virtual call count by the active session limit; and

subtract the active session limit from the virtual call count.

13. A machine-readable medium comprising machine-readable code which, when read, causes a network device to:

store a number of current active sessions, up to an active session limit;

store a virtual call count, defined as the number of current active sessions that would exist if there were no active session limit;

calculate a plurality of parameters for a service level agreement using the active session limit and the virtual call count;

accept and reject requests based upon the active session limit set forth in the service level agreement;

decrease the virtual call count by one whenever an elapsed time from when a request is rejected exceeds a predetermined call duration; and

divide a number of rejected requests during a selected period of time by a total number of requests during the selected period of time.