PACKET NETWORK LINEAR PROTECTION SYSTEMS AND METHODS IN A DUAL HOME OR MULTI-HOME CONFIGURATION

• US 20150288598A1
• Filed: 04/03/2014
• Published: 10/08/2015
• Est. Priority Date: 04/03/2014
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Hu, Jie, Holness, Marc, Jadav, Asheesh, Bhattacharya, Somen
• Granted Patent: US 9,407,535 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 12/462 LAN interconnection over a bridge based backbone
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 41/0663 Performing the actions predefined by failover planning, e.g. switching to standby network elements
• CPC Class Codes: H04L 41/0816 the condition being an adaptation, e.g. in response to network events
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/28 using route fault recovery
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]
• CPC Class Codes: H04L 7/0004 Initialisation of the receiver H04L7/0075 and H04L7/10 take precedence

Abstract

A packet network linear protection method, a network, and a node in a dual or multi-home configuration include designating each of a plurality of home nodes in the dual or multi-home configuration as a working home or a protect home; designating each link between each of the plurality of home nodes and an end node in the dual or multi-home configuration as active or standby; operating a protection switch state machine based on an associated linear protection protocol at each of the plurality of home nodes and the end node; communicating protection messages to each of the plurality of home nodes from the end node; and communicating protection states in an associated protection switch state machine by each of the plurality of home nodes to other home nodes and to the end node.

Claims

1. A packet network linear protection method in a dual or multi-home configuration, comprising:

designating each of a plurality of home nodes in the dual or multi-home configuration as a working home or a protect home;

designating each link between each of the plurality of home nodes and an end node in the dual or multi-home configuration as active or standby;

operating a protection switch state machine based on an associated linear protection protocol at each of the plurality of home nodes and the end node;

communicating protection messages to each of the plurality of home nodes from the end node; and

communicating protection states in an associated protection switch state machine by each of the plurality of home nodes to other home nodes and to the end node.

2. The packet network linear protection method of claim 1, further comprising:

communicating the protection states by each of the plurality of home nodes to other home nodes via a designated link between home nodes or via the end node.

3. The packet network linear protection method of claim 1, further comprising:

communicating the protection states by each of the plurality of home nodes to other home nodes via the end node; and

implementing protection switching responsive to a fault on any link between each of the plurality of home nodes and the end node, wherein the associated protection switch state machine at a home node of the plurality of home nodes isolated by the fault is out of synchronization until recovery of the fault.

4. The packet network linear protection method of claim 1, further comprising:

designating each of the plurality of home nodes by configuration or signaling.

5. The packet network linear protection method of claim 1, further comprising:

designating each link between each of the plurality of home nodes and the end node, independent of working or protect designations, based on a signal carried by the end node to each of the plurality of home nodes.

6. The packet network linear protection method of claim 1, wherein the associated linear protection protocol comprises one of Automatic Protection Switching (APS) in G.8031, Protection State Coordination (PSC) in Multiprotocol Label Switching (MPLS) Transport Profile (MPLS-TP) (RFC 6378), Provider Backbone Bridge Traffic Engineering (PBB-TE) Tunnel Protection (IEEE 802.1ay), and 1:

1 pseudowire (PW).

7. The packet network linear protection method of claim 1, wherein the associated linear protection protocol is configured to switch in a single home configuration between the end node and another end node, and wherein the packet network linear protection method adapts the associated linear protection protocol to switch between the end node and the plurality of home nodes while preserving the protection messages and the associated protection switch state machine of the associated linear protection protocol.

8. A network providing packet network linear protection in a dual or multi-home configuration, comprising:

an end node;

a plurality of home nodes each communicatively coupled to the end node by an associated link in the dual or multi-home configuration; and

an associated linear protection protocol operating between the end node and the plurality of home nodes;

wherein the end node and the plurality of home nodes are configured to;

receive a designation as a working home or a protect home;

designate each associated link between each of the plurality of home nodes and the end node as active or standby;

operate a protection switch state machine based on the associated linear protection protocol;

communicate protection messages therebetween; and

communicate protection states in an associated protection switch state machine therebetween.

9. The network of claim 8, wherein the end node and the plurality of home nodes are further configured to:

communicate the protection states by each of the plurality of home nodes to other home nodes via a designated link between home nodes or via the end node.

10. The network of claim 8, wherein the end node and the plurality of home nodes are further configured to:

communicate the protection states by each of the plurality of home nodes to other home nodes via the end node; and

implement protection switching responsive to a fault on any link between each of the plurality of home nodes and the end node, wherein the associated protection switch state machine at a home node of the plurality of home nodes isolated by the fault is out of synchronization until recovery of the fault.

11. The network of claim 8, wherein the end node and the plurality of home nodes are further configured to:

receive the designation by configuration or signaling.

12. The network of claim 8, wherein the end node and the plurality of home nodes are further configured to:

designate each associated link between each of the plurality of home nodes and the end node, independent of working or protect designations, based on a signal carried by the end node to each of the plurality of home nodes.

13. The network of claim 8, wherein the associated linear protection protocol comprises one of Automatic Protection Switching (APS) in G.8031, Protection State Coordination (PSC) in Multiprotocol Label Switching (MPLS) Transport Profile (MPLS-TP) (RFC 6378), Provider Backbone Bridge Traffic Engineering (PBB-TE) Tunnel Protection (IEEE 802.1ay), and 1:

1 pseudowire (PW).

14. The network of claim 8, wherein the associated linear protection protocol is configured to switch in a single home configuration between the end node and another end node, and wherein the associated linear protection protocol is adapted to switch between the end node and the plurality of home nodes while preserving the protection messages and the associated protection switch state machine of the associated linear protection protocol.

15. A node providing packet network linear protection in a dual or multi-home configuration, comprising:

a plurality of ports communicatively coupled to a plurality of nodes over associated links in the dual or multi-home configuration;

a controller communicatively coupled to the plurality of ports and operating a protection switch state machine associated with a linear protection protocol;

wherein, if the node is a home node in the dual or multi-home configuration, the controller is configured to;

receive a designation as a working home or a protect home;

designate a link with an end node as active or standby;

operate the protection switch state machine; and

communicate protection messages and protection state changes to the end node and other home nodes; and

wherein, if the node is the end node in the dual or multi-home configuration, the controller is configured to;

designate each link with home nodes in the dual or multi-home configuration as active or standby;

operate the protection switch state machine; and

communicate protection messages and protection state changes to each of the home nodes.

16. The node of claim 15, wherein the controller is further configured to:

when the node is the home node, communicate the protection messages and the protection state changes to the end node and to other home nodes via one of a designated link or the end node.

17. The node of claim 15, wherein the linear protection protocol comprises one of Automatic Protection Switching (APS) in G.8031, Protection State Coordination (PSC) in Multiprotocol Label Switching (MPLS) Transport Profile (MPLS-TP) (RFC 6378), Provider Backbone Bridge Traffic Engineering (PBB-TE) Tunnel Protection (IEEE 802.1ay), and 1:

1 pseudowire (PW).

18. The node of claim 15, wherein the linear protection protocol is configured to switch in a single home configuration between the end node and another end node, and wherein the linear protection protocol is adapted to switch between the end node and the home nodes while preserving the protection messages and the protection switch state machine of the linear protection protocol.