Internet protocol version 6 content routing
First Claim
1. A content delivery system comprising:
- a first cache server location including a first redirector and a first set of cache servers;
a second cache server location including a second redirector and a second set of cache servers; and
a domain name server that performs operations comprising;
receiving a request for a cache server address; and
providing an internet protocol version 6 anycast address; and
wherein the first redirector performs operations comprising;
receiving a content request from a client system, the content request addressed to the internet protocol version 6 anycast address;
receiving load information from the first set of cache servers, wherein the load information comprises central processing unit information, memoryutilization, a number of concurrent requests being served, and an amount of available bandwidth;
receiving load information for the second cache server location from the second redirector;
determining when a first cache server of the first set of cache servers is available, whereinthe first cache server is available for only local requests when the first cache serverhas a load that is below an upper threshold for the first cache server and above alower threshold for the first cache server, wherein the first cache server is availablefor both the local requests and transferred requests when the load is below the lowerthreshold, wherein the first cache server is unavailable when the load exceeds theupper threshold for the first cache server;
forwarding the request to the first cache server when the first cache server is available; and
forwarding the request to the second redirector when the first set of cache servers are unavailable;
wherein the second redirector performs operations comprising;
receiving load information from the second set of cache servers;
receiving a content request forwarded from the first redirector;
selecting a second cache server of the second set of cache servers based on the load information received from the second set of cache servers; and
forwarding the request to the second cache server, wherein the second redirector utilizes a ranked list of alternate cache server locations and redirects the content request to the second cache server when the second cache server is a highest ranked alternate cache server location currently available;
wherein each cache server of the first and second sets of cache servers performs operations comprising;
receiving the content request forwarded from the first or second redirector;
sending a response to the content request to the client system, the response including an internet protocol version 6 unicast address of the cache server as a source address, an internet protocol version 6 unicast address of the client system as a destination address, and the internet protocol version 6 anycast address as a home address; and
providing the content to a requestor.
1 Assignment
0 Petitions
Accused Products
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.
52 Citations
13 Claims
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1. A content delivery system comprising:
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a first cache server location including a first redirector and a first set of cache servers; a second cache server location including a second redirector and a second set of cache servers; and a domain name server that performs operations comprising; receiving a request for a cache server address; and
providing an internet protocol version 6 anycast address; andwherein the first redirector performs operations comprising; receiving a content request from a client system, the content request addressed to the internet protocol version 6 anycast address; receiving load information from the first set of cache servers, wherein the load information comprises central processing unit information, memory utilization, a number of concurrent requests being served, and an amount of available bandwidth; receiving load information for the second cache server location from the second redirector; determining when a first cache server of the first set of cache servers is available, wherein the first cache server is available for only local requests when the first cache server has a load that is below an upper threshold for the first cache server and above a lower threshold for the first cache server, wherein the first cache server is available for both the local requests and transferred requests when the load is below the lower threshold, wherein the first cache server is unavailable when the load exceeds the upper threshold for the first cache server; forwarding the request to the first cache server when the first cache server is available; and forwarding the request to the second redirector when the first set of cache servers are unavailable; wherein the second redirector performs operations comprising; receiving load information from the second set of cache servers; receiving a content request forwarded from the first redirector; selecting a second cache server of the second set of cache servers based on the load information received from the second set of cache servers; and forwarding the request to the second cache server, wherein the second redirector utilizes a ranked list of alternate cache server locations and redirects the content request to the second cache server when the second cache server is a highest ranked alternate cache server location currently available; wherein each cache server of the first and second sets of cache servers performs operations comprising; receiving the content request forwarded from the first or second redirector; sending a response to the content request to the client system, the response including an internet protocol version 6 unicast address of the cache server as a source address, an internet protocol version 6 unicast address of the client system as a destination address, and the internet protocol version 6 anycast address as a home address; and
providing the content to a requestor. - View Dependent Claims (2, 3, 4, 5)
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6. A redirector comprising:
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a processor; and a storage medium having instructions that, when executed by the processor, cause the processor to perform operations comprising; receiving a content request from a client system, the content request addressed to an internet protocol version 6 anycast address; receiving load information from a local cache server, the local cache server co-located with the redirector, wherein the load information comprises central processing unit information, memory utilization, a number of concurrent requests being served, and an amount of available bandwidth; receiving a load status for an alternate cache server location from a remote redirector, the load status indicating the alternate cache server location as available when a remote cache server has a load below an overload threshold, the remote cache server being co-located with the remote redirector at the alternate cache server location; determining when the local cache server is available, wherein the local cache server is available for only local requests when the local cache server has a load that is below an upper threshold for the local cache server and above a lower threshold for the local cache server, wherein the local cache server is available for both the local requests and transferred requests when the load is below the lower threshold, wherein the local cache server is unavailable when the load exceeds the upper threshold for the local cache server; forwarding the content request to the local cache server when the local cache server is available; and forwarding the content request to the remote redirector when the local cache server is not available, wherein the remote redirector utilizes a ranked list of alternate cache server locations and redirects the content request to a highest ranked alternate cache server location currently available. - View Dependent Claims (7, 8, 9)
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10. A computer readable device comprising a plurality of instructions to manipulate a processor to perform operations comprising:
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receiving a content request from a client system, the content request addressed to an internet protocol version 6 anycast address; receiving load information from a local cache server, wherein the load information comprises central processing unit information, memory utilization, a number of concurrent requests being served, and an amount of available bandwidth; receiving a load status for an alternate cache server location from a remote redirector, the load status indicating the alternate cache server location as available when a remote cache server has a load below an overload threshold, the remote cache server co-located with the remote redirector at the alternate cache server location; determining when the local cache server is available, wherein the local cache server is available for only local requests when the local cache server has a load that is below an upper threshold for the local cache server and above a lower threshold for the local cache server, wherein the local cache server is available for both the local requests and transferred requests when the load is below the lower threshold, wherein the local cache server is unavailable when the load exceeds the upper threshold for the local cache server; forwarding the content request to the local cache server when the local cache server is available; and forwarding the content request to the remote redirector when the local cache server is not available, wherein the remote redirector utilizes a ranked list of alternate cache server locations and redirects the content request to a highest ranked alternate cache server location currently available. - View Dependent Claims (11, 12, 13)
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Specification