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Integrated Adaptive Anycast for Content Distribution

  • US 20110153719A1
  • Filed: 12/22/2009
  • Published: 06/23/2011
  • Est. Priority Date: 12/22/2009
  • Status: Active Grant
First Claim
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1. A system comprising:

  • first and second cache servers, the cache servers each configured to respond to an anycast address, the first cache server configured to respond to a first unicast address, and the second cache server configured to respond to a second unicast address;

    a domain name server, the domain name server configured to;

    receive a request from a requestor for a cache server address;

    provide an anycast address to the requestor when a status of the first cache server is non-overloaded; and

    provide the second unicast address to the requestor when the status of the first cache server is offline or overloaded; and

    a route controller, the router controller configured to;

    determine the status of the first cache server, the status being non-overloaded, overloaded, or offline;

    instruct the domain name server to provide the second unicast address when the status is overloaded or offline; and

    modify routing of the anycast address to direct a content request sent to the anycast address to the second cache server when the status is offline.

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