Label selection for end-to-end label-switched traffic through a communications network
First Claim
1. A method of label selection for end-to-end transport of label switched traffic through a communications network between a source node and a destination node, the method comprising the steps of:
- a) launching a request message toward the destination node from the source node, the request message including label availability indication indicative of labels available for use by the source node;
b) extracting the label availability indication from the request message; and
c) comparing the label availability indication with a label availability table indicative of labels available for a successive hop between the source node and the destination node, to produce an end-to-end label availability indication;
whereby the end-to-end label availability indication is indicative of respective corresponding labels available for end-to-end transport of label switched traffic between the source node and the destination node;
wherein the communications network uses wave division multiplexing (WDM) for transport of said label switched traffic, the label switched traffic being associated with labels for use in switching the traffic between the source node and the destination node, each label identifying a respective data transport wavelength.
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Accused Products
Abstract
In a method of label selection for end-to-end transport of label switched traffic through a communications network between a source node and a destination node, a request message is launched toward the destination node from the source node. The request message includes a label list having one or more label identifiers indicative of respective corresponding labels available for use by the source node. The label list is revised, at a cross-connect service each successive hop between the source node and the destination node, based on labels available for use by each respective hop, to produce a reduced label list. The reduced label list includes label identifiers indicative of respective corresponding labels available for end-to-end transport of label switched traffic between the source node and the destination node.
2 Citations
24 Claims
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1. A method of label selection for end-to-end transport of label switched traffic through a communications network between a source node and a destination node, the method comprising the steps of:
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a) launching a request message toward the destination node from the source node, the request message including label availability indication indicative of labels available for use by the source node; b) extracting the label availability indication from the request message; and c) comparing the label availability indication with a label availability table indicative of labels available for a successive hop between the source node and the destination node, to produce an end-to-end label availability indication; whereby the end-to-end label availability indication is indicative of respective corresponding labels available for end-to-end transport of label switched traffic between the source node and the destination node; wherein the communications network uses wave division multiplexing (WDM) for transport of said label switched traffic, the label switched traffic being associated with labels for use in switching the traffic between the source node and the destination node, each label identifying a respective data transport wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communications network for label selection for end-to-end transport of label switched traffic though the communications network, the communications network comprising:
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a) a source node adapted to launch a request message toward a destination node, the request message including a label availability indication indicative of labels available for use by the source node, wherein the label availability indication is configured to be extracted from the request message; and b) a hop intermediate between the source node and the destination node and configured to serve an intermediate node between the source node and the destination node, wherein the intermediate node is adapted to compare the label availability indication with a label availability table indicative of labels available for the hop, to produce an end-to-end label availability indication; wherein the communications network uses wave division multiplexing (WDM) for transport of said label switched traffic, the label switched traffic being associated with labels for use in switching the traffic between the source node and the destination node, each label identifying a respective data transport wavelength. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An intermediate node of a communications network adapted for end-to-end transport of label switched traffic through the communications network between a source node and a destination node, the intermediate node comprising:
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a) a label availability table indicative of labels available for conveying label switched traffic through a respective communications link connected to the intermediate node; b) a buffer adapted to receive a request message propagated through the communications network from the source node, the request message including a label availability indicator indicative of labels available for conveying label switched traffic between the source node and the intermediate node; c) a processor adapted to extract the label availability indication from the request message and compare the extracted label availability indication with the label availability table indicative of labels available for the respective communications link to produce an intermediate label availability indication; and wherein the communications network uses wave division multiplexing (WDM) for transport of said label switched traffic, the label switched traffic being associated with labels for use in switching the traffic between the source node and the destination node, each label identifying a respective data transport wavelength. - View Dependent Claims (21, 22, 23, 24)
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Specification