SYSTEMS AND METHODS FOR PLATFORM RATE LIMITING

• US 20100322071A1
• Filed: 06/18/2010
• Published: 12/23/2010
• Est. Priority Date: 06/22/2009
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Mirani, Rajiv, Talla, Ramanjaneyulu Y., Bots, Henk, Avdanin, Roman, Chauhan, Abhishek
• Granted Patent: US 9,071,526 B2
• Time in Patent Office: Days
• US Class Current: 370/230
• CPC Class Codes: H04L 43/0894 Packet rate
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/20 Traffic policing
• CPC Class Codes: H04L 47/215 using token-bucket
• CPC Class Codes: H04L 47/2425 for supporting services specification, e.g. SLA
• CPC Class Codes: H04L 47/32 by discarding or delaying data units, e.g. packets or frames
• CPC Class Codes: H04L 63/0272 Virtual private networks
• CPC Class Codes: H04L 63/102 Entity profiles

Abstract

The present disclosure presents systems and methods for controlling network traffic traversing an intermediary device based on a license or a permit granted for the intermediary device. The systems and methods control a rate of a traffic of a device in accordance with a rate limit identified by a rate limiting license. A rate limiting manager of an intermediary device that processes network traffic between a plurality of clients and a plurality of servers, may identify presence of a rate limiting license that further identifies a performance level. The rate limiting manager may establish a rate limit based on the performance level of the rate limiting license. A throttler of the intermediary may control a rate of receiving network packets in accordance with the rate limit.

Claims

1. A method for controlling a rate of a traffic of a device in accordance with a rate limit identified by a rate limiting license, the method comprising:

a) identifying, by a rate limiting manager of an intermediary device, presence of a rate limiting license, the intermediary device processing network traffic between a plurality of clients and a plurality of servers, the rate limiting license identifying a performance level;

b) establishing, by the rate limiting manager, a rate limit based on the performance level of the rate limiting license; and

c) controlling, by a throttler of the intermediary, a rate of receiving network packets in accordance with the rate limit.

2. The method of claim 1, wherein step (a) further comprises identifying, by the rate limiting manager, the rate limiting license is not present, and wherein step (b) comprises establishing a set of one or more rate limit parameters for the rate limit for a lower performance level.

3. The method of claim 1, wherein step (a) further comprises identifying, by the rate limiting manager, a type of hardware platform of the intermediary device, and wherein step (b) further comprises establishing the rate limit based on the type of hardware platform and the performance level.

4. The method of claim 1, wherein step (b) further comprises establishing, by the rate limiting manager, a maximum size of a token bucket in milliseconds based on the rate limit for the performance level of the rate limiting license.

5. The method of claim 4, wherein step (c) further comprises receiving, by the throttler, a network packet, determining that the token bucket has reached the maximum size and discarding the network packet in response to the determination.

6. The method of claim 1, wherein step (b) further comprises establishing, by the rate limiting manager, a throughput rate limit in bits per second based on the rate limit for the performance level of the rate limiting license.

7. The method of claim 6, wherein step (c) further comprises generating, by a token generator, a token for a token bucket at a rate specified by the throughput rate limit.

8. The method of claim 1, wherein step (b) further comprises establishing, by the rate limiting manager, a packet rate in packets per second based on the rate limit for the performance level of the rate limiting license.

9. The method of claim 8, wherein step (c) further comprises receiving, by the throttler, a network packet having a number of bytes, and removing, by the throttler, a number of tokens from a token bucket equal to the number of bytes.

10. The method of claim 8, wherein step (c) further comprises receiving, by the throttler, a network packet having a number of bytes, determining, by the throttler, that a number of tokens in a token bucket is less than the number of bytes and not removing a token from the token bucket.

11. The method of claim 10, further comprises providing, by the throttler, the network packet to an excess packet handler.

12. A system for controlling a rate of a traffic of a device in accordance with a rate limit identified by a rate limiting license, the system comprising:

a rate limiting manager of an intermediary device identifying presence of a rate limiting license, the intermediary device processing network traffic between a plurality of clients and a plurality of servers, the rate limiting license identifying a performance level;

the rate limiting manager establishing a rate limit based on the performance level of the rate limiting license; and

a throttler of the intermediary controlling a rate of receiving network packets in accordance with the rate limit.

13. The system of claim 12, further comprising the rate limiting manager identifying the rate limiting license is not present and establishing a set of one or more rate limit parameters for the rate limit for a lower performance level.

14. The system of claim 12, further comprising the rate limiting manager identifying a type of hardware platform of the intermediary device and establishing the rate limit based on the type of hardware platform and the performance level.

15. The system of claim 12, further comprising the rate limiting manager establishing a maximum size of a token bucket in milliseconds based on the rate limit for the performance level of the rate limiting license.

16. The system of claim 15, further comprising the throttler receiving a network packet, determining that the token bucket has reached the maximum size and discarding the network packet in response to the determination.

17. The system of claim 12, further comprising the rate limiting manager establishing a throughput rate limit in bits per second based on the rate limit for the performance level of the rate limiting license.

18. The system of claim 17, further comprising a token generator generating a token for a token bucket at a rate specified by the throughput rate limit.

19. The system of claim 12, further comprising the rate limiting manager establishing a packet rate in packets per second based on the rate limit for the performance level of the rate limiting license.

20. The system of claim 19, further comprising the throttler receiving a network packet having a number of bytes and removing a number of tokens from a token bucket equal to the number of bytes.

21. The system of claim 19, further comprising the throttler receiving a network packet having a number of bytes, determining that a number of tokens in a token bucket is less than the number of bytes and not removing a token from the token bucket.

22. The system of claim 21, further comprising the throttler providing the network packet to an excess packet handler.