Method and apparatus for performing packet synchronized switch-over
First Claim
1. A method of performing packet synchronized switch-over for virtual channel links of an intermediate cell relay entity, comprising the steps of:
- receiving a switch-over request, the switch-over request soliciting a change from a first virtual channel link to a second virtual channel link;
monitoring received cells for state information identifying the occurrence of a frame completed state of a frame; and
performing switch-over from the first virtual channel link to the second virtual channel link after detecting state information in a cell identifying the occurrence of a frame completed state of a frame.
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Abstract
A method and apparatus for performing packet synchronized switch-over is disclosed. The present invention eliminates packet loss by preventing frame integrity from being broken. Switch-over requests soliciting a change from a first virtual channel link to a second virtual channel link are received. After the receipt of a switch-over request, state information for identifying the occurrence of a frame completed state is monitored. The switch-over from the first virtual channel link to the second virtual channel link is performed when the frame completed state occurs. The frame completed state is detected by determining whether a current cell being received has an AUU set. The invention eliminates packet loss by maintaining layer frame integrity for both ingress and egress switch-over requests.
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Citations
33 Claims
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1. A method of performing packet synchronized switch-over for virtual channel links of an intermediate cell relay entity, comprising the steps of:
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receiving a switch-over request, the switch-over request soliciting a change from a first virtual channel link to a second virtual channel link; monitoring received cells for state information identifying the occurrence of a frame completed state of a frame; and performing switch-over from the first virtual channel link to the second virtual channel link after detecting state information in a cell identifying the occurrence of a frame completed state of a frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A cell relay switch for performing packet synchronized switch-over for virtual channel links, comprising:
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a line interface device having a plurality of input and output ports connected to a plurality of virtual channel links; a switch fabric, operatively coupled to the line interface device, for routing incoming cells received from incoming virtual channel links to outgoing virtual channel links; and a switch controller, operatively coupled to the line interface device, for receiving a switch-over request, the switch-over request soliciting a change from a first virtual channel link to a second virtual channel link; wherein the line interface device monitors received cells for state information of incoming cells identifying the occurrence of a frame completed state of a frame and initiates switch-over from the first virtual channel link to the second virtual channel link after detecting state information in a cell identifying the occurrence of a frame completed state of a frame. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A cell relay intermediate entity providing packet synchronized switch-over for virtual channel links, comprising:
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means for obtaining a switch-over request, the switch-over request soliciting a change from a first virtual channel link to a second virtual channel link; means, operatively coupled to the obtaining means, for receiving cells and monitoring the received cells for state information identifying the occurrence of a frame completed state; and means, operatively coupled to the identifying means, for performing switch-over from the first virtual channel link to the second virtual channel link after detecting state information in a cell identifying the occurrence of a frame completed state of a frame.
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Specification