Optimizing application performance in a network environment

• US 9,172,756 B2
• Filed: 03/12/2013
• Issued: 10/27/2015
• Est. Priority Date: 03/12/2013
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Ramachandran, Karthikeyan, Chaudhuri, Sragdhara Datta
• Primary Examiner(s): JEAN, FRANTZ B
• Application Number:
  US13/797,177
• Publication Number:
  US 20140280813A1
• Time in Patent Office: 959 Days
• Field of Search: 709/203, 709/223, 709/206, 370/389, 370/229, 370/392, 718/105
• US Class Current: 1/1
• CPC Class Codes: H04L 67/1006 with static server selection, e.g. the same server being selected for a specific client
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers

Abstract

An example method for optimizing application performance in a network environment is provided and includes retrieving an L7 session identifier (ID) from a packet, generating a hash from at least the L7 session ID, and inserting the hash into a header of the packet. The L7 session ID identifies a particular application layer session between a client and a server in a network environment. The server includes a plurality of processors configured to process the packet, and the hash indicates a specific processor in the plurality of processors.

Claims

1. A method, comprising:

receiving at a load balancer in a network environment, a packet destined to an application executing at a plurality of servers in the network, wherein each server comprises a plurality of processors configured to process the packet;

selecting, by the load balancer, a specific one of the servers to forward the packet;

retrieving, by the load balancer, an L7 session identifier (ID) from the packet, wherein the L7 session ID identifies a particular application layer session corresponding to the application;

generating, by the load balancer, a hash from at least the L7 session ID, wherein the hash indicates a specific processor in the plurality of processors in the selected server;

inserting the hash into a header of the packet; and

forwarding the packet with the hash to the selected server, wherein the specific processor indicated by the hash processes the packet in the selected server.

2. The method of claim 1, wherein the server is configured to forward the packet to the specific processor indicated by the hash.

3. The method of claim 1, wherein the specific processor is indicated by a processor identifier that is a modulo of the hash and the number of processors in the plurality of processors.

4. The method of claim 1, wherein the hash is inserted into at least one field from a group consisting of transport layer header fields and network layer header fields.

5. The method of claim 1, wherein the hash is inserted into at least one field selected from a group consisting of application context tag in an EtherType field and an Internet Protocol version 6 (IPv6) extension header.

6. The method of claim 1, further comprising inserting the hash into headers of substantially all packets of the particular application layer session.

7. The method of claim 6, wherein at least some packets belong to one flow of the application layer session, and other packets belong to another flow of the application layer session.

8. The method of claim 1, further comprising looking up a sticky database to determine the server indicated by the L7 session ID.

9. The method of claim 8, further comprising selecting the server according to a server load balancing algorithm if the lookup is unsuccessful.

10. The method of claim 9, further comprising adding an entry into the sticky database to indicate the server selected according to the server load balancing algorithm corresponding to the L7 session ID.

11. One or more non-transitory media encoding logic that includes instructions for execution and when executed by a processor, is operable to perform operations comprising:

receiving at a load balancer in a network environment, a packet destined to an application executing at a plurality of servers in the network, wherein each server comprises a plurality of processors configured to process the packet;

selecting, by the load balancer, a specific one of the servers to forward the packet;

retrieving, by the load balancer, an L7 session identifier (ID) from the packet, wherein the L7 session ID identifies a particular application layer session corresponding to the application;

generating, by the load balancer, a hash from at least the L7 session ID, wherein the hash indicates a specific processor in the plurality of processors in the selected server;

inserting the hash into a header of the packet; and

forwarding the packet with the hash to the selected server, wherein the specific processor indicated by the hash processes the packet in the selected server.

12. The media of claim 11, wherein the server is configured to forward the packet to the specific processor indicated by the hash.

13. The media of claim 11, wherein the specific processor is indicated by a processor identifier that is a modulo of the hash and the number of processors in the plurality of processors.

14. The media of claim 11, wherein the operations further comprise inserting the hash into headers of substantially all packets of the particular application layer session.

15. The media of claim 14, wherein at least some packets belong to one flow of the application layer session, and other packets belong to another flow of the application layer session.

16. An apparatus in a network environment, comprising:

a memory element for storing data; and

a processor that executes instructions associated with the data, wherein the processor and the memory element cooperate such that the apparatus is configured for;

receiving at the apparatus, a packet destined to an application executing at a plurality of servers in the network, wherein each server comprises a plurality of processors configured to process the packet;

selecting, by the apparatus, a specific one of the servers to forward the packet;

retrieving, by the apparatus, an L7 session identifier (ID) from the packet, wherein the L7 session ID identifies a particular application layer session corresponding to the application;

generating, by the apparatus, a hash from at least the L7 session ID, wherein the hash indicates a specific processor in the plurality of processors in the selected server;

inserting the hash into a header of the packet; and

forwarding the packet with the hash to the selected server, wherein the specific processor indicated by the hash processes the packet in the selected server.

17. The apparatus of claim 16, wherein the server is configured to forward the packet to the specific processor indicated by the hash.

18. The apparatus of claim 16, wherein the specific processor is indicated by a processor identifier that is a modulo of the hash and the number of processors in the plurality of processors.

19. The apparatus of claim 16, wherein the apparatus is further configured for inserting the hash into headers of substantially all packets of the particular application layer session.

20. The apparatus of claim 19, wherein at least some packets belong to one flow of the application layer session, and other packets belong to another flow of the application layer session.