METHOD AND APPARATUS FOR PROTECTION SWITCHING IN POINT-TO-MULTIPOINT NETWORK
First Claim
1. A method of performing protection switching in a network comprising a first node and a plurality of second nodes that are connected to the first node, the method comprising:
- counting a number of obstacles that have occurred in a plurality of paths that are connected between the first node and the plurality of second nodes;
performing protection switching per leaf if the counted number is smaller than a predetermined threshold value; and
performing protection switching per tree if the counted number is equal to or larger than a predetermined threshold value.
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Abstract
A method of performing protection switching in a network including a first node and a plurality of second nodes that are connected to the first node is provided. The first node counts the number of obstacles that have occurred in a plurality of paths that are connected between the plurality of second nodes, and if the counted number is smaller than a predetermined threshold value, the first node performs protection switching per leaf. Alternatively, if the counted number is equal to or larger than a predetermined threshold value, the first node performs protection switching per tree.
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Citations
17 Claims
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1. A method of performing protection switching in a network comprising a first node and a plurality of second nodes that are connected to the first node, the method comprising:
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counting a number of obstacles that have occurred in a plurality of paths that are connected between the first node and the plurality of second nodes; performing protection switching per leaf if the counted number is smaller than a predetermined threshold value; and performing protection switching per tree if the counted number is equal to or larger than a predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of performing protection switching in a network comprising a first node and a plurality of second nodes that are connected to the first node, the method comprising:
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counting the number of obstacles that have occurred in a plurality of paths that are connected between the first node and the plurality of second nodes; maintaining the first switching mode when a present protection switching mode is a first switching mode that performs protection switching per leaf, if the counted number is smaller than a preset first threshold value; converting, when a present protection switching mode is a first switching mode that performs protection switching per leaf, if the counted number is equal to or larger than the first threshold value, the present protection switching mode to a second switching mode that performs protection switching per tree; maintaining the second switching mode when a present protection switching mode is a second switching mode that performs protection switching per tree, if the counted number is equal to or larger than a preset second threshold value; and converting, when a present protection switching mode is a second switching mode that performs protection switching per tree, if the counted number is smaller than the second threshold value, the present protection switching mode to a first switching mode that performs protection switching per leaf. - View Dependent Claims (9, 10, 11)
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12. A protection switching apparatus in a network comprising a first node and a plurality of second nodes that are connected to the first node, the protection switching apparatus comprising:
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a local state monitoring unit that monitors a state of each of a plurality of paths that are connected per second node and that detects whether an obstacle occurs and that outputs a local request according to occurrence of an obstacle; a multiple local priority determination unit that performs a local priority logic step for a plurality of local requests that are output per second node and that selects and outputs a local request having a top priority order per second node; a far end state monitoring unit that monitors whether a message according to each protection switching report is transmitted from the second node and that outputs a far end request according to a message that is received per second node; and a plurality of multiple global priority determination units that compare an input far end request or a local request having a top priority order with a global request having a present top priority order and that output a request having a higher priority order as a comparison result as a global request having a top priority order for performing protection switching and that correspond to each of the second nodes, wherein each multiple global priority determination unit receives and processes a local request and a far end request that are input from a corresponding second node. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification