Smart ethernet edge networking system

• US 8,509,062 B2
• Filed: 08/07/2006
• Issued: 08/13/2013
• Est. Priority Date: 08/07/2006
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Arseneault, Jim, Barrett, Chris, Frank, Pablo, Smith, Brian
• Primary Examiner(s): Hamza, Faruk
• Assistant Examiner(s): OH, ANDREW CHUNG SUK
• Application Number:
  US11/500,052
• Publication Number:
  US 20080031129A1
• Time in Patent Office: 2,563 Days
• Field of Search: 370/223, 370/224, 370/249
• US Class Current: 370/224
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

A telecommunications system includes a network for transporting packets on a path between selected subscriber end points. The network has multiple nodes connected by links, with each node (a) pairing the forward and backward paths of a connection and (b) allowing for the injection of messages in the backward direction of a connection from any node in the path without needing to consult a higher OSI layer. A system is also provided for protecting connection paths for transporting data packets through an Ethernet telecommunications network having a multiplicity of nodes interconnected by a multiplicity of links. Primary and backup paths are provided through the network for each of multiple connections, with each path including multiple links. Data packets arriving at a first node common to the primary and backup paths are duplicated, and one of the duplicate packets is transported over the primary path, the other duplicate packet is transported over the backup path, and the duplicate packets are recombined at a second node common to the primary and backup paths.

Claims

1. A telecommunications system comprising

a network for transporting Ethernet packets on a path between selected subscriber end points, said network having multiple nodes connected by links, with each intermediate node,

(a) pairing a unidirectional connection-oriented MPLS-Label-switched forward path and a unidirectional connection-oriented MPLS-Label-switched backward path, both said forward and backward paths reaching the same subscriber end points of a connection and configured to use the same set of nodes and links, wherein each intermediate node comprises a hairpin between the forward and backward paths, and

(b) allowing for the injection of control messages in said backward path from any intermediate node in the path via the hairpin without said control messages needing to hold additional information about said forward and backward paths due to said pairing and without needing to consult a higher OSI layer or involving a transit end comprising one of the subscriber end points,

wherein each intermediate node comprises one or more rules assigned to an ingress interface of the node, wherein the one or more rules identify specific packets to be acted on using ingress matching criteria associated with the one or more rules, and wherein the specific packets to be acted on are looped-back via the hairpin using action mechanisms associated with the one or more rules,

wherein the one or more rules comprise one or more of a rule that sends traffic out a specific egress interface to a downstream node regardless of bit pattern, a rule that sends traffic with a unique bit pattern out the hairpin to an upstream node, and a rule that sends traffic with the unique bit pattern out an interface to a test device, and

wherein the one or more rules are selectively enabled and disabled to look for and act on specific types of control messages.

2. The telecommunications system of claim 1 in which said paired forward and backward paths have different characteristics, said different characteristics comprising different labels and traffic engineering information.

3. The telecommunications system of claim 1 in which a single backward path is paired with multiple forward paths.

4. The telecommunications system of claim 1 in which each node includes a packet treatment rule applied to said injected control messages that allows snakes and jitter testing.

5. The telecommunications system of claim 1 in which each node includes means for switching to a backup path comprising paired unidirectional forward and backward paths when one of the paired paths fails.

6. The telecommunications system of claim 1 further comprising a plurality of rules operated at each node and configured to determine use of the hairpin for one or more types of packet or all packets crossing a port.

7. The telecommunications system of claim 1 wherein said injected control messages comprise port-state messages.

8. The telecommunications system of claim 1 wherein said injected control messages are configured to perform continuity checking.

9. A telecommunications method comprising

transporting Ethernet packets through a network on a path between selected subscriber end points, said network having multiple nodes connected by links, and

at each intermediate node (a) pairing unidirectional connection-oriented MPLS-Label-switched forward and backward paths of a connection, (b) configuring said forward and backward paths to use the same set of nodes and links, wherein each intermediate node comprises a hairpin between the forward and backward paths, and (c) allowing for the injection of control messages in the backward direction of a connection from any intermediate node in the path via the hairpin without said control messages needing to hold additional information about said forward and backward paths due to said pairing and without consulting a higher OSI layer or involving a transit end comprising one of the subscriber end points,

wherein each intermediate node comprises one or more rules assigned to an ingress interface of the node, wherein the one or more rules identify specific packets to be acted on using ingress matching criteria associated with the one or more rules, and wherein the specific packets to be acted on are looped-back via the hairpin using action mechanisms associated with the one or more rules,

wherein the one or more rules comprise one or more of a rule that sends traffic out a specific egress interface to a downstream node regardless of bit pattern, a rule that sends traffic with a unique bit pattern out the hairpin to an upstream node, and a rule that sends traffic with the unique bit pattern out an interface to a test device, and

wherein the one or more rules are selectively enabled and disabled to look for and act on specific types of control messages.

10. The telecommunications method of claim 9 in which said paired forward and backward paths have different characteristics, said different characteristics comprising different labels and traffic engineering information.

11. The telecommunications method of claim 9 in which a single backward path is paired with multiple forward paths.

12. The telecommunications method of claim 9 in which each node includes a packet treatment rule applied to said injected control messages that allows snakes and jitter testing.

13. The telecommunications method of claim 9 in which each node includes means for switching to a backup path comprising paired unidirectional forward and backward paths when one of the paired paths fails.

14. The telecommunication system of claim 13 in which a new backup path comprising paired unidirectional forward and backward paths is created after a path has switched to a backup path for a prescribed length of time.

15. The method of claim 9 further comprising implementing a plurality of rules operated at each node and configured to determine use of the hairpin for one or more types of packet or all packets crossing a port.

16. The method of claim 9 wherein said injected control messages comprise port-state messages.

17. The method of claim 9 wherein said injected control messages are configured to perform continuity checking.

18. An Ethernet network comprising

multiple nodes connected by links, two of said multiple nodes comprising subscriber end points transporting Ethernet packets on a path;

wherein one or more of said multiple nodes comprise intermediate nodes on said path, each intermediate node configured to perform steps of;

pairing a unidirectional connection-oriented forward path and a unidirectional connection-oriented backward path providing bi-directional transport of said Ethernet packets on said path,

ensuring both said forward and backward paths reaching the same subscriber end points using a same set of nodes and links, wherein each intermediate node comprises a hairpin between the forward and backward paths, and

injecting control messages in said backward path from any intermediate node in the path via the hairpin to provide continuity check of said forward and backward paths without said control messages needing to hold additional information about said forward and backward paths due to said pairing and said ensuring and without needing to consult a higher layer or involving a transit end comprising one of the subscriber end points;

wherein each intermediate node comprises one or more rules assigned to an ingress interface of the node, wherein the one or more rules identify specific packets to be acted on using ingress matching criteria associated with the one or more rules, and wherein the specific packets to be acted on are looped-back via the hairpin using action mechanisms associated with the one or more rules,

wherein the one or more rules comprise one or more of a rule that sends traffic out a specific egress interface to a downstream node regardless of bit pattern, a rule that sends traffic with a unique bit pattern out the hairpin to an upstream node, and a rule that sends traffic with the unique bit pattern out an interface to a test device, and

wherein the one or more rules are selectively enabled and disabled to look for and act on specific types of control messages.

19. The Ethernet network of claim 18 wherein said paired forward and backward paths have different characteristics, said different characteristics comprising different labels and traffic engineering information.