Patent ID: 8560598

Claim:
A system comprising: first and second cache servers, wherein each of the cache servers responds to an anycast address, wherein the first cache server responds to a first unicast address, and the second cache server responds to a second unicast address; a domain name server that performs operations comprising: receiving a request from a requestor for a cache server address; providing the anycast address to the requestor when a status of the first cache server is non-overloaded; and providing the second unicast address to the requestor when the status of the first cache server is offline or overloaded; and a route controller that performs operations comprising: determining the status of the first cache server, the status being non-overloaded, overloaded, or offline; instructing the domain name server to provide the second unicast address to the requestor when the status is overloaded or offline; and modifying 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.