INTERNET PROTOCOL VERSION 6 CONTENT ROUTING

• US 20150026251A1
• Filed: 10/07/2014
• Published: 01/22/2015
• Est. Priority Date: 03/22/2010
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Van der Merwe, Jacobus, Lee, Seungjoon, Spatscheck, Oliver
• Granted Patent: US 9,167,032 B2
• Time in Patent Office: Days
• US Class Current: 709/203
• CPC Class Codes: H04L 2101/659 Internet protocol version 6 [IPv6] addresses
• CPC Class Codes: H04L 25/03923 according to the rank
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• CPC Class Codes: H04L 67/01 Protocols
• 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 67/101 based on network conditions
• CPC Class Codes: H04L 67/1017 based on a round robin mechanism
• CPC Class Codes: H04L 67/288 Distributed intermediate devices, i.e. intermediate devices for interaction with other intermediate devices on the same level
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 67/63 Routing a service request depending on the request content or context

Abstract

A content delivery system includes a cache server, a domain name server, and a redirector. The domain name server is configured to receive a request for a cache server address, and provide an IPv6 anycast address. The redirector is configured to receive a content request addressed to the IPv6 anycast address from a client system, receive load information from the cache server, and determine if the cache server is available. The redirector is further configured to forward the content request to the cache server when the cache server is available. The cache server is configured to receive the content request forwarded from the redirectors, send a response to the content request to a client system, the response including an IPv6 unicast address of the cache server as a source address, an IPv6 unicast address of the client system as a destination address, and the IPv6 anycast address as a home address, and provide the content to the requestor.

Claims

1. A system, comprising:

a memory that stores instructions;

a processor that executes the instructions to perform operations, the operations comprising;

determining a load for a local cache server located in a first cache server location, wherein the load comprises central processing unit information, memory utilization, a number of concurrent requests being served, and an amount of available bandwidth;

determining when the local cache server is available, wherein the local cache server is available for only a local request for content when the load is below an upper threshold and above a lower threshold for the local cache server, wherein the local cache server is available for both the local request and a transferred request when the load is below the lower threshold, and wherein the local cache server is not available when the load exceeds the upper threshold for the local cache server; and

forwarding, when the local cache server is determined to not be available, a content request for the content to a redirector in a second cache server location, wherein the content request is redirected from the redirector to a highest ranked alternate cache server location selected from a ranked list of alternate cache server locations.

2. The system of claim 1, wherein the operations further comprise forwarding the content request to the local cache server when the local cache server is determined to be available.

3. The system of claim 1, wherein the operations further comprise receiving the content request from a client system, wherein the content request is addressed to an anycast address.

4. The system of claim 1, wherein the operations further comprise providing, in response to the content request and via the highest ranked alternate cache server location, the content to a client system.

5. The system of claim 1, wherein the operations further comprise receiving, from the redirector, load information for the second cache server location, wherein the load information indicates an availability of a remote cache server located in the second cache server location.

6. The system of claim 1, wherein the operations further comprise receiving a request for a cache server address.

7. The system of claim 6, wherein the operations further comprise providing an anycast address in response to the request for the cache server address.

8. The system of claim 1, wherein the operations further comprise transmitting, in response to the content request, a response including a unicast address as a source address, a unicast address of a client system as a destination address, and an anycast address as a home address.

9. The system of claim 1, wherein the operations further comprise selecting the local cache server when the load for the local cache server is lower than a load of a different local cache server in the first cache server location.

10. A method, comprising:

determining a load for a local cache server located in a first cache server location, wherein the load comprises central processing unit information, memory utilization, a number of concurrent requests being served, and an amount of available bandwidth;

determining, by utilizing instructions from memory that are executed by a processor, when the local cache server is available, wherein the local cache server is available for only a local request for content when the load is below an upper threshold and above a lower threshold for the local cache server, wherein the local cache server is available for both the local request and a transferred request when the load is below the lower threshold, and wherein the local cache server is not available when the load exceeds the upper threshold for the local cache server; and

forwarding, when the local cache server is determined to not be available, a content request for the content to a redirector in a second cache server location, wherein the content request is redirected from the redirector to a highest ranked alternate cache server location selected from a ranked list of alternate cache server locations.

11. The method of claim 10, further comprising forwarding the content request to the local cache server when the local cache server is determined to be available.

12. The method of claim 10, further comprising receiving the content request from a client system, wherein the content request is addressed to an anycast address.

13. The method of claim 10, further comprising providing, in response to the content request and via the highest ranked alternate cache server location, the content to a client system.

14. The method of claim 10, further comprising receiving, from the redirector, load information for the second cache server location, wherein the load information indicates an availability of a remote cache server located in the second cache server location.

15. The method of claim 10, further comprising receiving a request for a cache server address.

16. The method of claim 15, further comprising providing an anycast address in response to the request for the cache server address.

17. The method of claim 10, further comprising transmitting, in response to the content request, a response including a unicast address as a source address, a unicast address of a client system as a destination address, and an anycast address as a home address.

18. The method of claim 10, further comprising selecting the local cache server when the load for the local cache server is lower than a load of a different local cache server in the first cache server location.

19. A computer-readable device comprising instructions, which, when loaded and executed by a processor, cause the processor to perform operations, the operations comprising:

determining a load for a local cache server located in a first cache server location, wherein the load comprises central processing unit information, memory utilization, a number of concurrent requests being served, and an amount of available bandwidth;

determining when the local cache server is available, wherein the local cache server is available for only a local request for content when the load is below an upper threshold and above a lower threshold for the local cache server, wherein the local cache server is available for both the local request and a transferred request when the load is below the lower threshold, and wherein the local cache server is not available when the load exceeds the upper threshold for the local cache server; and

forwarding, when the local cache server is determined to not be available, a content request for the content to a redirector in a second cache server location, wherein the content request is redirected from the redirector to a highest ranked alternate cache server location selected from a ranked list of alternate cache server locations.

20. The computer-readable device of claim 19, wherein the operations further comprise providing, in response to the content request and via the highest ranked alternate cache server location, the content to a client system.