# US 2019/0356407 A1 · Systems and methods for mesh restoration in networks due to intra-node faults > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356407 A1 - Document ID: US20190356407A1 - Status: Published application - Kind: A1 - Application number: 15/985,114 - Filed: 2018-05-21 - Published: 2019-11-21 - Earliest claimed: 2018-05-21 - Assignees: Ciena Corporation - Applicants: Ciena Corporation - Inventors: Choudhury A. Al Sayeed; Dominic Richens - Web page: https://patentgrep.com/patent/US20190356407A1 ## CPC - H04J 14/0268: {Restoration of optical paths, e.g. p-cycles} - H04J 14/0275: {using an optical service channel} - H04J 14/021: {Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]} - H04J 14/0217: {Multi-degree architectures, e.g. having a connection degree greater than two} - H04J 14/0272: {Transmission of OAMP information} - H04J 14/0295: {Shared protection at the optical channel (1:1, n:m)} - H04J 14/0284: {WDM mesh architectures} - H04J 2203/006: Fault tolerance and recovery - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) ## Abstract Systems and methods are in a node in a network utilizing a control plane for triggering mesh restoration due to intra-node faults, and include monitoring at least one channel at a degree at a plurality of degrees associated with the node; detecting a fault on the at least one channel, wherein the fault is an intra-node fault upstream of the degree; and transmitting a channel fault indicator downstream of the fault to at least one downstream node along a path of the faulted channel, wherein restoration is triggered based on the channel fault indicator. ## Claims ### Claim 1 A method implemented in a node in a network utilizing a control plane for triggering mesh restoration due to an intra-node fault, the method comprising: monitoring at least one channel at a degree at a plurality of degrees associated with the node; detecting a fault on the at least one channel, wherein the fault is an intra-node fault upstream of the degree; and transmitting a channel fault indicator downstream of the fault to at least one downstream node along a path of the faulted channel, wherein restoration is triggered based on the channel fault indicator, wherein the fault is an intra-node fault that affects degree-to-degree connectivity and comprises any of a fiber fault, a power failure on a shelf or on active components of an associated degree, and a loss of communication with a control plane processor, and wherein the channel fault indicator includes information related to the intra-node fault to identify the intra-node fault by the control plane. ### Claim 2 (depends on 1) The method of claim 1, wherein the restoration comprises rerouting the faulted channel exclusive of the fault which is internal to the node. ### Claim 3 (depends on 2) The method of claim 2, wherein a rerouted path for the faulted channel can still traverse the node through other non-faulted degrees exclusive of the fault. ### Claim 4 (canceled) ### Claim 5 (canceled) ### Claim 6 (depends on 1) The method of claim 1, wherein the plurality of degrees are implemented in separate hardware such that the fault is a partial failure of one part of the separate hardware. ### Claim 7 (depends on 1) The method of claim 1, comprising: receiving a second channel fault indicator from an upstream node for a second channel; and transmitting the second channel fault indicator downstream of the second fault to at least one remaining downstream node along a path of the second faulted channel and suppressing a subsequent channel fault indicator from the node. ### Claim 8 (depends on 1) The method of claim 1, wherein each degree comprises one of i) an Optical Service Channel (OSC) and ii) equipment for signaling over a signaling channel or in-band, for communication to associated adjacent nodes, wherein the transmitting is over the OSC, the signaling channel, or in-band. ### Claim 9 An apparatus disposed in a node in a network utilizing a control plane for triggering mesh restoration due to an intra-node fault, the apparatus comprising: circuitry configured to monitor at least one channel at a degree of a plurality of degrees associated with the node; circuitry configured to detect a fault on the at least one channel, wherein the fault is an intra-node fault upstream of the degree; and circuitry configured to cause transmission of a channel fault indicator downstream of the fault to at least one downstream node along a path of the faulted channel, wherein restoration is triggered based on the channel fault indicator, wherein the fault is an intra-node fault that affects degree-to-degree connectivity and comprises any of a fiber fault, a power failure on a shelf or on active components of an associated degree, and a loss of communication with a control plane processor, and wherein the channel fault indicator includes information related to the intra-node fault to identify the intra-node fault by the control plane. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the restoration comprises rerouting the faulted channel exclusive of the fault which is internal to the node. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein a rerouted path for the faulted channel can still traverse the node through other non-faulted degrees exclusive of the fault. ### Claim 12 (canceled) ### Claim 13 (canceled) ### Claim 14 (depends on 9) The apparatus of claim 9, wherein the plurality of degrees are implemented in separate hardware such that the fault is a partial failure of one part of the separate hardware. ### Claim 15 (depends on 9) The apparatus of claim 9, comprising: circuitry configured to receive a second channel fault indicator from an upstream node for a second channel; and circuitry configured to cause transmission of the second channel fault indicator downstream of the second fault to at least one remaining downstream node along a path of the second faulted channel and suppressing a subsequent channel fault indicator from the node. ### Claim 16 (depends on 9) The apparatus of claim 9, wherein each degree comprises one of i) an Optical Service Channel (OSC) and ii) equipment for signaling over a signaling channel or in-band, for communication to associated adjacent nodes, wherein the transmission is over the OSC, the signaling channel, or in-band. ### Claim 17 (canceled) ### Claim 18 (canceled) ### Claim 19 (canceled) ### Claim 20 (canceled) ### Claim 21 An apparatus disposed in a node in a network utilizing a control plane for triggering mesh restoration due to an intra-node fault, the apparatus comprising: circuitry configured to monitor at least one channel at a degree of a plurality of degrees associated with the node; circuitry configured to detect a fault on the at least one channel, wherein the fault is an intra-node fault upstream of the degree; circuitry configured to cause transmission of a channel fault indicator downstream of the fault to at least one downstream node along a path of the faulted channel, wherein restoration is triggered based on the channel fault indicator; circuitry configured to receive a second channel fault indicator from an upstream node for a second channel; and circuitry configured to cause transmission of the second channel fault indicator downstream of the second fault to at least one remaining downstream node along a path of the second faulted channel and suppressing a subsequent channel fault indicator from the node. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the restoration comprises rerouting the faulted channel exclusive of the fault which is internal to the node. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein a rerouted path for the faulted channel can still traverse the node through other non-faulted degrees exclusive of the fault. ### Claim 24 (depends on 21) The apparatus of claim 21, wherein the plurality of degrees are implemented in separate hardware such that the fault is a partial failure of one part of the separate hardware. ### Claim 25 (depends on 21) The apparatus of claim 21, wherein each degree comprises one of i) an Optical Service Channel (OSC) and ii) equipment for signaling over a signaling channel or in-band, for communication to associated adjacent nodes, wherein the transmission is over the OSC, the signaling channel, or in-band. ### Claim 26 (depends on 21) The apparatus of claim 21, wherein the fault is an intra-node fault that affects degree-to-degree connectivity and comprises any of a fiber fault, a power failure on a shelf or on active components of an associated degree, and a loss of communication with a control plane processor. ### Claim 27 (depends on 26) The apparatus of claim 26, wherein the channel fault indicator includes information related to the intra-node fault to identify the intra-node fault by the control plane.