System and method to exchange information between a control element and forwarding elements in a network element architecture

• US 7,428,219 B2
• Filed: 02/27/2004
• Issued: 09/23/2008
• Est. Priority Date: 02/27/2004
• Status: Active Grant

• Current Assignee: Tahoe Research Limited (f/k/a Learndale Limited) (Vector Capital Corporation)
• Original Assignee: Intel Corporation
• Inventors: Khosravi, Hormuzd M.
• Primary Examiner(s): Nguyen; Chau
• Assistant Examiner(s): Weidner; Timothy J
• Application Number:
  US10/789,402
• Publication Number:
  US 20050190783A1
• Time in Patent Office: 1,670 Days
• Field of Search: 370/439
• US Class Current: 370/254
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures
• CPC Class Codes: H04L 69/168 specially adapted for link layer protocols, e.g. asynchronous transfer mode [ATM], synchronous optical network [SONET] or point-to-point protocol [PPP]
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities

Abstract

A network element comprises a control element (CE), a plurality of forwarding element (FEs) and an interconnect in communication with said CE and at least one of said FEs. Communication across the interconnect between the CE and the plurality of FEs is done in accordance with a protocol that includes a binding phase used to provide a data channel between the CE and a first one of the FEs. The binding phase is further used to provide a control channel between the CE and the first one of the FEs, the control channel used to transport control and configuration messages. The control channel is separate from the data channel. The protocol also includes a capability discovery phase, a configuration operation phase and an unbind phase executed between the CE and the FE.

Claims

1. A method comprising:

exchanging information between a control element (CE) and one or more forwarding element (FEs), the exchanging comprising;

executing a binding phase between the CE and a first one of FEs to provide a data channel and a control channel separate from the data channel, the data channel configured to transport packets including at least one of redirected packets from the first one of the FEs to the CE and packets to be forwarded from the CE to a second one of the FEs, the control channel configured to transport control and configuration messages;

executing a capability discovery phase between the CE and the first one of the FEs, the capability discovery phase comprising;

transmitting a capability request from the CE to the first one of the FEs;

transmitting a topology request from the CE to the first one of the FEs; and

executing a configuration operation phase between the CE and the first one of the FEs,

wherein executing a binding phase further comprises;

transmitting a bind request, from the first one of the FEs to the CE, to establish the data channel and the control channel; and

transmitting a bind response, from the CE to the first one of the FEs after the first one of the FEs has received the bind request, the bind response indicating whether the data channel and the control channel are established.

2. The method of claim 1 wherein the exchanging further comprising executing an unbind phase between the CE and the first one of the FEs,

wherein the unbind phase includes one of the CE and the first one of the FEs sending an unbind message to the other to cease association.

3. The method of claim 1 wherein said executing a capability discovery phase comprises:

receiving a capability response from the first one of the FEs in response to the capability request;

receiving a topology response from the first one of the FEs in response to the topology request; and

determining whether to transmit a start FE operation message from the CE to the first one of the FEs based on the capability response and the topology response.

4. The method of claim 1 wherein said executing a configuration operation phase comprises:

transmitting a configuration request from the CE to the first one of the FEs; and

transmitting a query request from the CE to the first one of the FEs.

5. The method of claim 4 wherein said executing a configuration operation phase further comprises:

transmitting a configuration response from the first one of the FEs to the CE after the first one of the FEs has received said configuration request;

transmitting a query response from the first one of the FEs to the CE after the first one of the FEs has received said query request;

transmitting an FE event notification message from the first one of the FEs to the CE; and

transmitting an FE packet redirection message from the first one of the FEs to the CE.

6. The method of claim 1 wherein said messages are provided having an eight-byte header.

7. The method of claim 1 wherein said messages are provided having a variable length payload.

8. A network element module comprising:

a control element (CE);

a plurality of forwarding elements (FEs); and

an interconnect in communication with said CE and said plurality of FEs and wherein communication across said interconnect between the CE and the FE is accomplished by executing instructions causing a machine to;

execute a binding phase between the CE and a first one of the FEs to provide a data channel and a control channel separate from the data channel, the data channel configured to transport packets including at least one of redirected packets from the first one of the FEs to the CE and packets to be forwarded from the CE to a second one of the FEs, the control channel configured to transport control and configuration messages;

execute a capability discovery phase between the CE and the first one of the FEs, the capability discovery phase comprising;

transmitting a capability request from the CE to the first one of the FEs;

transmitting a topology request from the CE to the first one of the FEs; and

execute a configuration operation phase between the CE and the first one of the FEs,

wherein executing a binding phase further comprises;

transmitting a bind request, from the first one of the FEs to the CE, to establish the data channel and the control channel; and

transmitting a bind response from the CE to the first one of the FEs after the first one of the FEs has received the bind request, the bind response indicating whether the data channel and the control channel are established.

9. The network element module of claim 8 wherein said communication further comprises executing an unbinding phase between the CE and the first one of the FEs,

wherein the unbind phase includes one of the CE and the first one of the FEs sending an unbind message to the other to cease association.

10. The network element module of claim 8 wherein said capability discovery phase comprises:

receiving a capability response from the first one of the FEs in response to the capability request;

receiving a topology response from the first one of the FEs in response to the topology request; and

determining whether to transmit a start FE operation message sent from the CE to the first one of the FEs based on the capability response and the topology response.

11. The network element module of claim 8 wherein said configuration operation phase comprises:

a configuration request sent from the CE to the first one of the FEs; and

a query request sent from the CE to the first one of the FEs.

12. The network element module of claim 11 wherein said configuration operation phase further comprises:

a configuration response sent from the first one of the FEs to the CE after the first one of the FEs has received said configuration request;

a query response sent from the first one of the FEs to the CE after the first one of the FEs has received said query request;

an FE event notification message sent from the first one of the FEs to the CE; and

an FE Packet redirection message sent from the first one of the FEs to the CE.

13. The network element module of claim 8 wherein said messages are provided having an eight-byte header.

14. The network element module of claim 8 wherein said messages are provided having a variable length payload.

15. An article comprising:

a storage medium having stored thereon instructions causing a machine to;

execute a binding phase between the CE and a first one of the FEs to provide a data channel and a control channel separate from the data channel, the data channel configured to transport packets including at least one of redirected packets from the first one of the FEs to the CE and packets to be forwarded from the CE to a second one of the FEs, the control channel configured to transport control and configuration messages;

execute a capability discovery phase between the CE and the first one of the FEs, the capability discovery phase comprising;

transmitting a capability request from the CE to the first one of the FEs;

transmitting a topology request from the CE to the first one of the FEs;

execute a configuration operation phase between the CE and the first one of the FEs,

wherein executing a binding phase further comprises;

transmitting a bind request, from the first one of the FEs to the CE, to establish the data channel and the control channel; and

transmitting a bind response from the CE to the first one of the FEs after the first one of the FEs has received said bind request, the bind response indicating whether the data channel and the control channel are established.

16. The article of claim 15, further comprising instructions causing a machine to execute an unbind phase between the CE and the first one of the FEs,

wherein the unbind phase includes one of the CE and the first one of the FEs sending an unbind message to the other to cease association.

17. The article of claim 15, further comprising instructions causing a machine to:

receive a capability response from the first one of the FEs in response to the capability request;

receive a topology response from the first one of the FEs in response to the topology request; and

determine whether to transmit a start FE operation message from the CE to the first one of the FEs based on the capability response and the topology response.

18. The article of claim 15, further comprising instructions causing a machine to:

execute at least one of transmit a configuration request from the CE to the first one of the FE; and

transmit a query request from the CE to the first one of the FEs.

19. The article of claim 18, further comprising instructions causing a machine to:

transmit a configuration response from the first one of the FEs to the CE after the first one of the FEs has received said configuration request;

transmit a query response from the first one of the FEs to the CE after the first one of the FEs has received said query request;

transmit an FE event notification message from the first one of the FEs to the CE; and

transmit an FE Packet redirection message from the first one of the FEs to the CE.

20. The article of claim 15, further comprising instructions causing a machine to provide said messages having an eight byte header.

21. The article of claim 15, further comprising instructions causing a machine to provide said messages having a variable length payload.