INTERNET PROTOCOL VERSION 6 CONTENT ROUTING

摘要

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.

主权项

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; andforwarding, 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.