Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Reexamination Certificate
2007-10-30
2007-10-30
Jung, Min (Department: 2663)
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
C370S249000, C714S001000
Reexamination Certificate
active
10310305
ABSTRACT:
In one embodiment, an intermediate node includes one or more active forwarding planes and one or more redundant forwarding planes. The intermediate node may also include one or more active control planes and one or more redundant control planes. A test packet is generated, in some cases by a redundant control plane, and transferred to a redundant forwarding plane. The operational state of the redundant forwarding plane is verified, at least in part, by using operational software and hardware contained in the redundant forwarding plane to forward the test packet from the redundant forwarding plane to a target line card. The target line card loops the test packet back to the redundant forwarding plane as part of the verification process. In some cases, the redundant control plane processes the looped-back test packet.
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“Notification of Transmittal of The International Search REport or the Declaration” for International Application No. PCT/US03/38274, with an international filing date of Mar. 12, 2003.
Donahue Timothy P.
Fedorkow Guy C.
Muntz Gary S.
Wildt Michael E.
Cesari and McKenna LLP
Cisco Technology Inc.
Jung Min
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