Policy-based content delivery network selection

• US 20080215718A1
• Filed: 10/26/2007
• Published: 09/04/2008
• Est. Priority Date: 09/28/2001
• Status: Active Grant

• Current Assignee: Sandpiper CDN, LLC (Theseus LF Asset Holdings, LLC)
• Original Assignee: Level 3 Communications LLC (Lumen Technologies, Inc.)
• Inventors: Brady, Mark, Hagberg, Aric, Koller, Jeffrey, Warren, Michael S., Yevmenkin, Maksim, Salmon, John K., Stolorz, Paul E., Pfitzner, David
• Granted Patent: US 7,860,964 B2
• Time in Patent Office: Days
• US Class Current: 709/223
• CPC Class Codes: H04L 41/0893 Assignment of logical groups to network elements
• CPC Class Codes: H04L 41/0894 Policy-based network configuration management
• CPC Class Codes: H04L 41/22 comprising specially adapted graphical user interfaces [GUI]
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/045 for graphical visualisation of monitoring data
• CPC Class Codes: H04L 43/06 Generation of reports
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 43/0817 by checking functioning
• CPC Class Codes: H04L 43/0852 Delays
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H04L 43/12 Network monitoring probes
• CPC Class Codes: H04L 47/20 Traffic policing
• CPC Class Codes: H04L 61/35 involving non-standard use of addresses for implementing network functionalities, e.g. coding subscription information within the address or functional addressing, i.e. assigning an address to a function
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• 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 67/1021 based on client or server locations
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/1029 using data related to the state of servers by a load balancer
• CPC Class Codes: H04L 67/1031 : Controlling of the operation of servers by a load balancer, e.g. adding or removing servers that serve requests
• CPC Class Codes: H04L 67/1034 : Reaction to server failures by a load balancer
• CPC Class Codes: H04L 67/52 : specially adapted for the location of the user terminal
• CPC Class Codes: H04L 69/329 : in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 : Network security protocols
• CPC Class Codes: H04W 4/02 : Services making use of location information
• CPC Class Codes: H04W 4/021 : Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
• CPC Class Codes: H04W 4/20 : Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel

Abstract

In a framework wherein resources of a content provider may be delivered to clients from different domains, a method distributes the requests based on content-provider policies. In some cases, the domains include at least two distinct content delivery network (CDN) domains. The domains may include a content provider domain. Responsive to a request, either the content provider domain or one of the two CDN domains is selected, the selection being based at least in part on one or more policies set by the content provider.

Claims

1. A method, operable in a framework wherein resources of a content provider are delivered to clients from a plurality of domains, said plurality of domains comprising at least two distinct content delivery network (CDN) domains, the method comprising:

responsive to a request, selecting one of said plurality of domains, said selecting being based at least in part on one or more policies set by the content provider; and

providing information associated with the selected domain.

2. A method as in claim 1 wherein said plurality of domains further comprises a content provider domain distinct from said CDN domains, and wherein:

when the selected domain is the content provider domain, the information associated with the selected domain includes at least one IP address associated with the content provider domain, and

when the selected domain is one of the CDN domains, the information associated with the selected domain includes a domain name associated with the selected CDN domain.

3. A method as in claim 1 wherein, when the selected domain is one of the CDN domains, the information associated with the selected domain comprises a CNAME associated with the selected CDN domain.

4. A method as in claim 1 wherein the one or more policies include a load share policy that specifies a relative load share for each of said plurality of domains, and wherein the step of selecting attempts to satisfy at least said load share policy.

5. A method as in claim 1 wherein the one or more policies include:

a load share policy that specifies a relative load share for each of said CDN domains, and wherein the step of selecting attempts to satisfy at least said load share policy.

6. A method as in claim 1 further comprising:

obtaining at least one updated content provider policy, and

wherein said one or more policies used by said step of selecting include said at least one updated content provider policy.

7. A method as in claim 6 wherein said step of obtaining is repeated at regular intervals.

8. A method as in claim 6 wherein said at least one updated content provider policy includes a load share policy for said at least two CDN domains.

9. A method as in claim 6 wherein said at least one updated content provider policy is obtained from a location specified by said content provider.

10. A method as in claim 1 further comprising, when the selected domain is one of the CDN domains:

identifying a particular content server in said selected CDN domain; and

providing the client with an address of the particular content server.

11. A method, operable in a framework wherein resources of a content provider are delivered to users from at least two distinct content delivery networks (CDNs), the method comprising:

obtaining one or more content provider policies relating to delivery of said resources, at least one of said policies relating to a relative load share for each of said at least two CDNs;

receiving a request from a client'"'"'s resolver to resolve a first domain name, said request having resulted from a client request for one of said resources of said content provider;

selecting, based at least in part on said one or more content provider policies, one of said at least two CDNs; and

when said step of selecting selects one of said at least two CDNs, providing the client'"'"'s resolver with a domain name associated with the selected CDN.

12. A method as in claim 11 wherein the information associated with the domain name associated with the selected CDN is a CNAME.

13. A method as in claim 11 wherein said step of obtaining is repeated at regular intervals.

14. A method as in claim 11 wherein the one or more policies include:

a load share policy that specifies a relative load share for each of said two CDNs, and

wherein the step of selecting attempts to satisfy at least said load share policy.

15. A method as in claim 11 wherein the resources are also delivered from one or more content sources associated with the content provider, and wherein the one or more policies include:

a load share policy that specifies a relative load share for said content sources and for each of said two CDNs, and wherein the step of selecting attempts to satisfy at least said load share policy.

16. A method as in claim 11 wherein the resources are also delivered from one or more content sources associated with the content provider, and wherein there are exactly k CDNs, each having a policy-specified load share of L_k associated therewith, and wherein the one or more content sources have a policy-specified load share of L_o associated therewith, and wherein said content provider policies include one or more policies that specify that requests should be distributed among said content sources and said k CDNs in the ratio L_o:

L₁;

L₂;

. . . ;

L_k, and wherein said step of selecting attempts to satisfy the distribution ratio L_o;

L₁;

L₂;

. . . ;

L_k.

17. A method as in claim 11 wherein there are exactly k CDNs, each having a policy-specified load share of L_k associated therewith, and wherein said content provider policies include one or more policies that specify that requests should be distributed among said k CDNs in the ratio L₁:

L₂;

. . . ;

L_k, and wherein said step of selecting attempts to satisfy the distribution ratio L₁;

L₂;

. . . ;

L_k.

18. A method as in claim 11 further comprising:

when said step of selecting selects one of said CDNs;

identifying a particular content server in said selected CDN; and

providing the client with an IP address associated with the particular content server.

19. A method, operable in a framework wherein resources of a content provider are delivered to clients from one of a plurality of distinct content delivery network (CDN) domains distinct from a content provider domain, the method comprising:

obtaining one or more content provider policies relating to delivery of said resources, at least one of said policies relating to a relative load share for each of said plurality of CDN domains;

selecting, based at least in part on said one or more content provider policies, one of said plurality of CDN domains; and

when said step of selecting selects one of said plurality of CDNs, providing the client with a domain name associated with the selected CDN.

20. A method as in claim 19 further comprising:

identifying a particular content server in said selected CDN; and

providing the client with an address of the particular content server.

21. A method as in claim 19 further comprising:

repeating the step of obtaining a regular intervals.

22. A method as in claim 19 wherein there are k CDN domains, and wherein said at least one of said policies relating to a relative load share for each of said plurality of CDN domains specifies that requests should be distributed among said k CDN domains in the ratio L₁:

L₂;

. . . ;

L_k, where L_j is the load ratio for the j-th CDN domain, for j=1 to k, and wherein said step of selecting attempts to satisfy the distribution ratio L₁;

L₂;

. . . ;

L_k.

23. A method, operable in a framework wherein resources of a content provider are delivered to clients from a content provider domain and from one of a plurality of distinct content delivery network (CDN) domains distinct from said content provider domain, the method comprising:

obtaining one or more content provider policies relating to delivery of said resources, at least one of said policies relating to a relative load share for said content provider domain and for each of said plurality of CDN domains;

selecting, based at least in part on said one or more content provider policies, either (a) said content provider domain, or (b) one of said plurality of CDN domains; and

when said step of selecting selects said content provider domain, providing the client with at least one IP address associated with a server in the content provider domain; and

when said step of selecting selects one of said plurality of CDNs, providing the client with a domain name associated with the selected CDN.

24. A method, operable in a framework wherein resources of a content provider are delivered to users from one or more content sources associated with said content provider and from at least two distinct content delivery networks (CDNs), the method comprising:

obtaining one or more content provider policies relating to delivery of said resources, at least one of said policies relating to a relative load share for said one or more content sources and for each of said at least two CDNs;

receiving a request from a client'"'"'s resolver to resolve a first domain name, said request having resulted from a client request for one of said resources of said content provider;

selecting, based at least in part on said one or more content provider policies, either (a) one of said one or more content sources, or (b) one of said at least two CDNs; and

when said step of selecting selects one of said content sources, providing the client with at least one IP address associated with the one of said content sources; and

when said step of selecting selects one of said at least two CDNs, providing the client with a domain name associated with the selected CDN.

25. A method as in claim 24 wherein there are exactly k CDNs, each having a policy-specified load share of L_k associated therewith, and wherein the one or more content sources have a policy-specified load share of L_o associated therewith, and wherein said content provider policies include one or more policies that specify that requests should be distributed among said content sources and said k CDNs in the ratio L_o:

L₁;

L₂;

. . . ;

L_k, and wherein said step of selecting attempts to satisfy the distribution ratio L_o;

L₁;

L₂;

. . . ;

L_k.