Methods and apparatus for caching network data traffic

• US 6,832,252 B1
• Filed: 11/14/2000
• Issued: 12/14/2004
• Est. Priority Date: 09/25/1997
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Mayes, John, Lowe, Ricky Kwong, Cieslak, Martin
• Primary Examiner(s): Najjar, Saleh
• Application Number:
  US09/714,464
• Time in Patent Office: 1,491 Days
• Field of Search: 709/217, 709/225, 709/226, 709/235, 709/245, 370/229
• US Class Current: 709/225
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• 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 67/288 Distributed intermediate devices, i.e. intermediate devices for interaction with other intermediate devices on the same level
• CPC Class Codes: H04L 67/56 Provisioning of proxy services store-and-forward switching systems in data switching networks H04L12/54
• CPC Class Codes: H04L 67/563 Data redirection of data network streams
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

Methods and apparatus for facilitating data transmission in a network are described. A first data request is received at a first intermediate platform, the first data request indicating a source platform and a destination platform. The first data request is redirected by the first intermediate platform to a first cache platform associated with the intermediate platform. Data received from the first cache platform and corresponding to the first data request are transmitted from the first intermediate platform to the source platform, the transmission indicating origination from the destination platform.

Claims

1. A method for facilitating data transmission in a network, the network comprising a source platform, a destination platform, a first intermediate platform, and a first cache platform associated with the first intermediate platform, the method comprising:

receiving a first data request at the first intermediate platform, the first data request indicating the source platform and the destination platform;

redirecting the first data request from the first intermediate platform to the first cache platform, the redirected first data request including a source IP address associated with the first intermediate platform; and

transmitting data received from the first cache platform and corresponding to the first data request from the first intermediate platform to the source platform, the transmission indicating origination from the destination platform.

2. The method of claim 1 further comprising:

where the data are not resident in the first cache platform, transmitting a second data request corresponding to the data to the destination platform.

3. The method of claim 1 further comprising selecting the first cache platform from among a plurality of cache platforms.

4. The method of claim 3 further comprising allocating a range of addresses to each of the plurality of cache platforms.

5. The method of claim 4 wherein the addresses are allocated so as to distribute data traffic among the cache platforms according to a predetermined scheme.

6. The method of claim 5 further comprising reallocating addresses among the cache platforms where actual data traffic patterns deviate from the predetermined scheme.

7. The method of claim 1 wherein the first data request is redirected to the cache platform only where the destination platform corresponds to a specific set of ports.

8. The method of claim 1 wherein the source platform and the destination platform are connected via a local area network.

9. The method of claim 1 wherein the source platform and the destination platform are connected via a wide area network.

10. The method of claim 1 wherein the source platform and the destination platform are connected via the Internet.

11. The method of claim 1 wherein the intermediate platform and the caching platform are connected via a second intermediate platform.

12. The method of claim 1 wherein redirecting the first data request comprises encapsulating the first data request to thereby create an encapsulated data request indicating the intermediate platform as its source and the caching platform as its destination.

13. At least one computer readable medium containing program instructions for facilitating data transmission in a network, the network comprising a source platform, a destination platform, a first intermediate platform, and a first cache platform associated with the first intermediate platform, said at least one computer readable medium comprising:

computer readable code for redirecting a first data request received at the first intermediate platform to the first cache platform, the first data request indicating the source platform and the destination platform, the redirected first data request including a source IP address associated with the first intermediate platform; and

computer readable code for transmitting data received from the first cache platform and corresponding to the first data request from the first intermediate platform to the source platform, the transmission indicating origination from the destination platform.

14. A computer data signal embodied in a carrier wave and representing sequences of instructions which, when executed by at least one processor, cause the at least one processor to facilitate data transmission in a network, the network comprising a source platform, a destination platform, a first intermediate platform, and a first cache platform associated with the first intermediate platform, the at least one processor performing the steps of:

executing first computer readable code for redirecting a first data request received at the first intermediate platform to the first cache platform, the first data request indicating the source platform and the destination platform, the redirected first data request including a source IP address associated with the first intermediate platform; and

executing second computer readable code for transmitting data received from the first cache platform and corresponding to the first data request from the first intermediate platform to the source platform, the transmission indicating origination from the destination platform.

15. An apparatus for facilitating data transmission in a network, the network comprising a source platform, a destination platform, the apparatus, and a first cache platform associated with the apparatus, the apparatus comprising:

means for receiving a first data request at the apparatus, the first data request indicating the source platform and the destination platform;

means for redirecting the first data request from the apparatus to the first cache platform, the redirected first data request including a source IP address associated with the apparatus; and

means for transmitting data received from the first cache platform and corresponding to the first data request from the apparatus to the source platform, the transmission indicating origination from the destination platform.

16. A routing platform for facilitating data transmission in a network, the network comprising a source platform, a destination platform, the routing platform, and a first cache platform associated with the routing platform, the routing platform comprising an operating system which is operable to enable the routing platform to:

receive a first data request indicating the source platform and the destination platform;

redirect the first data request to the first cache platform, the redirected first data request including a source IP address associated with the routing platform; and

transmit data received from the first cache platform and corresponding to the first data request from the routing platform to the source platform, the transmission indicating origination from the destination platform.

17. The routing platform of claim 16 wherein the operating system is further operable to enable the routing platform to transmit a second data request corresponding to the data to the destination platform where the data are not resident in the first cache platform.

18. The routing platform of claim 16 wherein the operating system is further operable to select the first cache platform from among a plurality of cache platforms.

19. The routing platform of claim 18 wherein the operating system is further operable to allocate a range of addresses to each of the plurality of cache platforms.

20. The routing platform of claim 19 wherein the addresses are allocated so as to distribute data traffic among the cache platforms according to a predetermined scheme.

21. The routing platform of claim 20 wherein the operating system is further operable to reallocate addresses among the cache platforms where actual data traffic patterns deviate from the predetermined scheme.

22. The routing platform of claim 16 wherein the operating system is further operable to redirect the first data request to the cache platform only where the destination platform corresponds to a specific set of ports.

23. The routing platform of claim 16 wherein the source platform and the destination platform are connected via a local area network.

24. The routing platform of claim 16 wherein the source platform and the destination platform are connected via a wide area network.

25. The routing platform of claim 16 wherein the source platform and the destination platform are connected via the Internet.

26. The routing platform of claim 16 wherein the routing platform and the caching platform are connected via a second intermediate platform.

27. The routing platform of claim 16 wherein redirecting the first data request comprises encapsulating the first data request to thereby create an encapsulated data request indicating the routing platform as its source and the caching platform as its destination.