Systems and methods for self-loading balancing access gateways

• US 9,037,712 B2
• Filed: 09/08/2010
• Issued: 05/19/2015
• Est. Priority Date: 09/08/2010
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Rafiq, Pierre, Kann, Jong
• Primary Examiner(s): Tiv, Backhean
• Application Number:
  US12/877,238
• Publication Number:
  US 20120059934A1
• Time in Patent Office: 1,714 Days
• Field of Search: 709224-226
• US Class Current: 709/225
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/563 Data redirection of data network streams

Abstract

The present invention is directed towards systems and methods for self-load balancing access gateways. The systems and methods include a master access gateway that receives load metrics and capabilities from a plurality of access gateways. The master access gateway also receives requests to determine if a request to start a new session is to be redirected to an access gateways. The master access gateways uses the load metrics and capabilities to select an access gateway to service the request.

Claims

1. A method of self-load balancing access gateways, the method comprising:

(a) selecting, by a plurality of access gateways, a first access gateway of the plurality of access gateways to perform load balancing;

(b) receiving, by the first access gateway of the plurality of access gateways, a load metric for each of the plurality of access gateways;

(c) transmitting, by a second access gateway of the plurality of access gateways responsive to receiving a first request from a client to start a new session, a second request to the first access gateway to determine if the new session is to be redirected to one of the plurality of access gateways;

(d) determining, by the first access gateway based on load metrics, to redirect the first request to a third access gateway;

(e) transmitting, by the first access gateway to the second access gateway, a response to the second request identifying the third access gateway; and

(f) returning, by the second access gateway, to the client, the first request modified to include a flag to indicate to the client to redirect the first request to the third access gateway.

2. The method of claim 1, wherein step (b) further comprises receiving, by a controller of the first access gateway, each load metric from a corresponding access gateway of the plurality of access gateways.

3. The method of claim 1, wherein step (b) further comprises receiving, by a controller of the first access gateway, capabilities of each of the plurality of access gateways.

4. The method of claim 1, wherein step (c) further comprises transmitting, by the first access gateway, the second request prior to establishing the new session.

5. The method of claim 1, wherein step (d) further comprises determining, by a controller of the first access gateway, the third access gateway based on load metrics and capabilities of the plurality of access gateways.

6. The method of claim 1, wherein step (e) further comprises transmitting, by the first access gateway, to the second access gateway the response comprising a network identifier and a port of the third access gateway.

7. The method of claim 1, wherein step (f) further comprises transmitting, by the second access gateway, to the client, the response comprising a HyperText Transfer Protocol redirection response.

8. The method of claim 1, wherein step (f) further comprises modifying, by the second access gateway, the first request to include the flag to indicate redirection has occurred.

9. The method of claim 8, further comprising receiving, by the third access gateway, the modified first request.

10. The method of claim 9, further comprising transmitting, by the third access gateway, a third request to the first access gateway with an indicator not to perform a load balancing decision for the modified first request.

11. A method of self-load balancing access gateways, the method comprising:

(a) selecting, by a plurality of access gateways, a first access gateway of the plurality of access gateways to perform load balancing;

(b) receiving, by the first access gateway of the plurality of access gateways, a load metric for each of the plurality of access gateways;

(c) transmitting, by a second access gateway of the plurality of access gateways responsive to receiving a first request from a client to start a new session, a second request to the first access gateway to determine if the new session is to be redirected to one of the plurality of access gateways;

(d) determining, by the first access gateway based on load metrics, to redirect the first request to the first access gateway;

(e) transmitting, by the first access gateway to the second access gateway, a response to the second request identifying the first access gateway; and

(f) returning, by the second access gateway, to the client, the first request modified to include a flag to indicate to the client to redirect the first request to the first access gateway.

12. The method of claim 11, wherein step (e) further comprises transmitting, by the first access gateway to the second access gateway, the response comprising a network identifier and a port of the first access gateway.

13. The method of claim 11, wherein step (f) further comprises transmitting, by the second access gateway, to the client, the response comprising a HyperText Transfer Protocol redirection response.

14. The method of claim 11, wherein step (f) further comprises modifying, by the second access gateway, the first request to include the flag to indicate redirection has occurred.

15. A system for self-load balancing access gateways, the system comprising:

a plurality of access gateways in communication via a network between a plurality of clients and one or more servers;

a controller of a first access gateway of the plurality of access gateways receiving a load metric for each of the plurality of access gateways;

a second access gateway of the plurality of access gateways transmitting, responsive to receiving a first request from a client to start a new session, a second request to the first access gateway to determine if the new session is to be redirected to one of the plurality of access gateways;

wherein the plurality of access gateways selects the first access gateway of the plurality of access gateways to perform load balancing;

wherein the controller of the first access gateway determines, based on load metrics, to redirect the first request to a third access gateway and transmits a response to the second request to the second access gateway identifying the third access gateway; and

wherein the second access gateway returns to the client the first request modified to include a flag to indicate to the client to redirect the first request to the third access gateway.

16. The system of claim 15, wherein the second access gateway transmits to the client the response comprising a HyperText Transfer Protocol redirection response.

17. The system of claim 15, wherein the second access gateway modifies the first request to include the flag to indicate redirection has occurred.

18. A system for self-load balancing access gateways, the system comprising:

a plurality of access gateway in communication via a network between a plurality of clients and one or more servers;

a controller of a first access gateway of the plurality of access gateways receiving a load metric for each of the plurality of access gateways;

a second access gateway of the plurality of access gateways transmitting, responsive to receiving a first request from a client to start a new session, a second request to the first access gateway to determine if the new session is to be redirected to one of the plurality of access gateways;

wherein the plurality of access gateways selects the first access gateway of the plurality of access gateways to perform load balancing;

wherein the controller of the first access gateway determines, based on load metrics, to redirect the first request to the first access gateway and transmits to the second access gateway a response to the second request identifying the first access gateway; and

wherein the second access gateway returns to the client the first request modified to include a flag to indicate to the client to redirect the first request to the first access gateway.

19. The system of claim 18, wherein the second access gateway transmits to the client the response comprising a HyperText Transfer Protocol redirection response.

20. The system of claim 18, wherein the second access gateway modifies the first request to include the flag to indicate redirection has occurred.