System and method for data plane fate separation of label distribution protocol (LDP) label switched paths (LSPs)
View Patent ↗A system, method and apparatus for controlling traffic forwarding at a label switched router (LSR) to implement thereby a constrained traffic forwarding application, such as a data plane fate separation between different FEC types.
1. A method for controlling traffic forwarding at a Label Switched Router (LSR), comprising:
defining one or more traffic forwarding capabilities (TFCs) associated with each of a plurality of data plane interfaces between said LSR and a peer LSR, wherein the one or more TFCs defined for at least one interface differs from the one or more TFCs defined for at least one other interface of the plurality of data plane interfaces;
indicating said one or more defined TFCs for each of the plurality of data plane interfaces to said peer LSR via a label distribution protocol (LDP) message; and
in response to said LSR receiving indication of agreement of said peer LSR to the one or more TFCs defined for at least one of the plurality of data plane interfaces, propagating traffic toward said peer LSR via the at least one agreed data plane interface, wherein traffic associated with the at least one agreed data plane interface is constrained in accordance with the corresponding one or more defined TFCs.
2. The method of claim 1 , wherein traffic of a first forwarding equivalence class (FEC) type is forwarded via a first data plane interface and traffic of a second FEC type is forwarded via a second data plane interface.
3. The method of claim 2 , wherein said one or more defined TFCs associated with said first data plane interface are adapted to prevent forwarding of traffic of said second FEC type.
4. The method of claim 2 , wherein said one or more defined TFCs associated with said second data plane interface are adapted to prevent forwarding of traffic of said first FEC type.
5. The method of claim 1 , wherein any of said one or more TFCs is based upon any of an IPv4 first forwards equivalence class (FEC) Element Type, an IPv6 Element Type, a Unicast Element Type, a Multicast Element Type, a PseudoWire Element Type and a MultiCast PseudoWire Element Type.
6. The method of claim 1 , wherein said each one or more TFCs associated with the corresponding interface of the plurality of data plane interfaces are indicated via a LDP TFC Type-Length-Value (TLV).
7. The method of claim 6 , wherein said LDP TFC TLV is carried within an Optional Parameter portion of a Hello Message.
8. The method of claim 1 , wherein said traffic is propagated toward said peer LSR after receiving an acknowledgment message from said peer LSR.
9. The method of claim 1 , wherein said traffic is propagated toward said peer LSR in accordance with the one or more defined TFCs for said at least one of the plurality of data plane interfaces, included within said acknowledgment message from said peer LSR.
10. The method of claim 9 , wherein said LSR and said peer LSR iteratively exchange proposed TFCs for corresponding proposed data plane interfaces until said agreement is reached, a time interval has expired or a number of iterations has been exceeded.
11. The method of claim 1 , wherein said one or more TFCs are defined in accordance with at least one of intrinsic requirements associated with LDP FEC types and extrinsic requirements associated with a particular operator.
12. The method of claim 11 , wherein the intrinsic and extrinsic requirements comprise fate-separation of various traffic types in the corresponding data plane interfaces between two LDP peering nodes.
13. The method of claim 11 , wherein the extrinsic requirements comprise an operator explicit configuration excluding a subset of the parallel links from forwarding a specific traffic type.
14. The method of claim 11 , wherein the extrinsic requirements comprise an operator explicit configuration assigning disjoint sub-sets of links to each FEC types for fate-separation of traffic in corresponding data plane interfaces.
15. The method of claim 1 , wherein a session between said LSR and said peer LSR involves a plurality of parallel links enabling label mappings exchange for multiple FEC types.
16. The method of claim 15 , wherein the session is associated with a plurality of Equal Cost Multi Path (ECMP) interfaces between said LSR and said peer LSR.
17. The method of claim 1 , wherein at least one determined TFC comprises disabling one or more LDP capabilities operating at a link level between said LSR and said peer LSR.
18. A telecom network element, for controlling traffic forwarding at a Label Switched Router (LSR), comprising a processor configured for:
defining one or more traffic forwarding capabilities (TFCs) associated with each of a plurality of data plane interfaces between said LSR and a peer LSR, wherein the one or more TFCs defined for at least one interface differs from the one or more TFCs defined for at least one other interface of the plurality of data plane interfaces;
indicating said one or more defined TFCs for each of the plurality of data plane interfaces to said peer LSR via a label distribution protocol (LDP) message; and
in response to said LSR receiving indication of agreement of said peer LSR to the one or more TFCs defined for at least one of the plurality of data plane interfaces, propagating traffic toward said peer LSR via the at least one agreed data plane interface, wherein traffic associated with the at least one agreed data plane interface is constrained in accordance with the corresponding one or more defined TFCs.
19. A tangible and non-transient computer readable storage medium storing instructions which, when executed by a computer, adapt the operation of the computer to provide a method for controlling traffic forwarding at a Label Switched Router (LSR), the method comprising:
defining one or more traffic forwarding capabilities (TFCs) associated with each of a plurality of data plane interfaces between said LSR and a peer LSR, wherein the one or more TFCs defined for at least one interface differs from the one or more TFCs defined for at least one other interface of the plurality of data plane interfaces;
indicating said one or more defined TFCs for each of the plurality of data plane interfaces to said peer LSR via a label distribution protocol (LDP) message; and
in response to said LSR receiving indication of agreement of said peer LSR to the one or more TFCs defined for at least one of the plurality of data plane interfaces, propagating traffic toward said peer LSR via the at least one agreed data plane interface, wherein traffic associated with the at least one agreed data plane interface is constrained in accordance with the corresponding one or more defined TFCs.
20. A computer program product wherein computer instructions, embodied on a non-transitory computer readable memory, when executed by a processor in a telecom network element, adapt the operation of the telecom network element to provide a method for controlling traffic forwarding at a Label Switched Router (LSR), the method comprising:
defining one or more traffic forwarding capabilities (TFCs) associated with each of a plurality of data plane interfaces between said LSR and a peer LSR, wherein the one or more TFCs defined for at least one interface differs from the one or more TFCs defined for at least one other interface of the plurality of data plane interfaces;
indicating said one or more defined TFCs for each of the plurality of data plane interfaces to said peer LSR via a label distribution protocol (LDP) message; and
in response to said LSR receiving indication of agreement of said peer LSR to the one or more TFCs defined for at least one of the plurality of data plane interfaces, propagating traffic toward said peer LSR via the at least one agreed data plane interface, wherein traffic associated with the at least one agreed data plane interface is constrained in accordance with the corresponding one or more defined TFCs.