Method and apparatus for processing protection switching mechanism in optical channel shared protection rings
First Claim
1. A method for processing protection signaling messages in a node in an optical network, comprising:
- treating protection signaling messages with a highest priority when there are resource contentions with other types of signaling messages;
treating all protection signaling messages in a single first-in-first-out fashion if there are multiple protection signaling messages waiting to be processed in a single node;
merging two channel failure response messages, each of said two channel failure response messages generated upon receipt of a corresponding channel failure message, destined for a same next node into one single combination channel failure response message in a single node; and
transmitting the single combination channel failure response message to the same next node in the optical network.
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Accused Products
Abstract
A method for merging protection switching messages in an optical network enables a control of the amount of message bandwidth used for sending protection switching messages. A method for performing protection switching in an optical network does so in an optimal manner by performing the protection switching actions in the various nodes of a protection path in parallel rather than in sequence. To do so, a channel failure message is transmitted from an end node A in the optical network upon detecting a failure in a link in the optical network that includes the end node A. If a failure can be detected at both end nodes, the channel failure messages are transmitted from both end nodes the moment they detect failure without any further waiting. Upon receiving the first channel failure message regardless its originating end node, switching actions in intermediate nodes are initiated. The channel failure messages are forwarded from the intermediate nodes to their corresponding next nodes before completing switching actions in the intermediate nodes. When receiving channel failure response messages, these messages are forwarded to a next node from the intermediate node only after switching actions are complete in the intermediate node.
17 Citations
16 Claims
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1. A method for processing protection signaling messages in a node in an optical network, comprising:
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treating protection signaling messages with a highest priority when there are resource contentions with other types of signaling messages; treating all protection signaling messages in a single first-in-first-out fashion if there are multiple protection signaling messages waiting to be processed in a single node; merging two channel failure response messages, each of said two channel failure response messages generated upon receipt of a corresponding channel failure message, destined for a same next node into one single combination channel failure response message in a single node; and transmitting the single combination channel failure response message to the same next node in the optical network. - View Dependent Claims (2, 3, 4)
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5. A method for processing protection signaling messages in a node in an optical network, comprising:
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treating protection signaling messages with a highest priority when there are resource contentions with other types of signaling messages; treating all protection signaling messages in a single first-in-first-out fashion if there are multiple protection signaling messages waiting to be processed in a single node; merging two channel failure messages, each of said two channel failure messages generated upon detection of a corresponding failure between endpoint nodes, destined for a same next node into one single combination channel failure message in a single node; and transmitting the single combination channel failure message to the same next node in the optical network.
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6. A method for processing channel failure messages in an optical network comprising:
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merging a plurality of channel failure messages into one combination channel failure message as long as all of the plurality of channel failure messages travel in a same direction, wherein each of said plurality of channel failure messages includes channel information requesting initiation of protection switching actions for a channel; and stripping out of the combination channel failure message corresponding channel information upon arrival at a destination end node corresponding to the channel information, wherein the combination channel failure message remaining after stripping out the corresponding channel information continues to a next node. - View Dependent Claims (7, 8, 9, 10)
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11. A method for operating an optical network, which is composed of optical channel shared protection rings including one or more optical add-drop ring multiplexers, two endpoint nodes, one or more intermediate nodes and a protection path, comprising:
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initiating at a first endpoint node protection switching by generating a first channel failure message and transmitting the first channel failure message toward the second endpoint node along a protection path upon detection of a failure; initiating at a second endpoint node protection switching by generating a second channel failure message and transmitting the second channel failure message toward the first endpoint node along a protection path upon detection of a failure, wherein each of said first channel failure message and said second channel failure message includes channel information requesting initiation of protection switching actions for a channel; within each node on the protection path, including both end nodes and said one or more intermediate nodes; upon receiving one of either the first or second channel failure messages, initiating protection switching actions for both directions and forwarding the one received channel failure message to a next node uni-directionally before protection switching actions are complete; and upon receiving the other of either the first or second channel failure messages, forwarding the other received channel failure message to a next node uni-directionally; merging a plurality of channel failure messages into one combination channel failure message as long as all of the plurality of channel failure messages travel in a same direction; and stripping out of the combination channel failure message corresponding channel information upon arrival at a destination end node corresponding to the channel information, wherein the combination channel failure message remaining after stripping out the corresponding channel information continues to a next node. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification