CN102984605A - Method and device for fault handing of optical channel bandwidth - Google Patents

Abstract

The invention discloses a non-destructive adjustment fault processing method and device for the bandwidth of an optical channel, belonging to the field of optical communication. The method includes: judging whether a faulty link in the optical channel data ODUflex path has completed high-order time slot adjustment; when the judgment result is that the link has completed high-order time slot adjustment, triggering the The bandwidth is adjusted to the adjusted state of each link when the link is not faulty, and the flex represents any bit rate. The present invention expands the adaptive processing capability of ODUflex lossless adjustment for faults, eliminates the inconsistency between the bandwidth of each segment of the ODUflex path in the event of a fault and the state before or after adjustment, and ensures that the ODUflex can still be adjusted normally or restored to before the adjustment in the event of a fault. State, adaptable.

Description

Fault processing method and device for optical channel bandwidth

technical field

The invention relates to the field of optical communication, in particular to a fault processing method and device for optical channel bandwidth.

Background technique

OTN (Optical transport network, optical transport network), as the core technology of the next-generation transport network, includes the technical specifications of the electrical layer and the optical layer, and has rich OAM (Operation Administration and Maintenance, network management), powerful TCM (Tandem Connection Monitoring, Serial connection monitoring) and out-of-band FEC (Forward Error Correction) capabilities can realize flexible scheduling and management of large-capacity services, and have increasingly become mainstream technologies for backbone transport networks. In the electrical processing layer, the powerful "digital encapsulation" structure defined by OTN technology can realize the management and monitoring of customer signals.

Please refer to Figure 1 for the OTN frame structure. The OTN frame is a 4080×4 modular structure, including FAS, OTUkOH (OpticalChannel Transport Unit-k Overhead, Optical Channel Transport Unit k overhead), ODUk OH (Optical Channel DataUnit-k Overhead, optical Channel data unit k overhead), OPUk OH (Optical Channel Payload Unit-kOverhead, optical channel payload unit k overhead), OPUk (Optical Channel Payload Unit-k, optical channel payload unit k) and FEC (Forward Error Correction, front to error correction) bytes. Among them, FAS (Frame Alignment Signal, frame alignment byte) provides the function of frame synchronization positioning. OTUk OH is the optical channel transport unit overhead byte, which provides network management functions at the optical channel transport unit level. ODUk OH is an optical channel data unit overhead byte, providing maintenance and operation functions. OPUk OH is the overhead byte of the optical channel payload unit, which provides the function of client signal adaptation. The OPUk is an optical channel payload unit, which provides the function of carrying client signals. FEC is a forward error correction byte that provides error detection and error correction functions. The coefficient k indicates the supported bit rate and different kinds of OPUk, ODUk and OTUk. k=1 means the bit rate is 2.5Gbit/s, k=2 means the bit rate is 10Gbit/s, k=3 means the bit rate is 40Gbit/s, k=4 means the bit rate is 100Gbit/s, k=flex means other The bit rate is of any size.

ODUflex maintains the original ODUk frame structure, and can carry CBR (Constant bit rate, fixed bit rate) services and packet services at any rate. For the packet service, it is encapsulated by GFP-F (Frame-Mapped Generic framing Procedure, a general framing procedure based on frame mapping), and then mapped to the OPUflex payload area, and then ODUflex is passed through GMP (Generic framing Procedure, general framing procedure). Frame protocol) is mapped to HO ODTUk.M (Higher Order, high order), HO ODTUk.M is multiplexed to HO OPUk (Higher Order Optical Channel Payload Unit-k, high order optical channel payload unit k), and the corresponding overhead is added and encapsulated as HO ODUk (Higher Order Optical Channel Data Unit-k, high-order optical channel data unit k), and finally carried by HO OTUk (Higher Order Optical Channel Transport Unit-k, high-order optical channel transmission unit k), where 2≤k≤4, M It means that ODUflex occupies M time slots in HO OPUk. ODUflex rate selection is M*TS rate, where 1≤M≤80, TS (Time Slot, time slot) rate is the time slot rate of HO OPUk.

ODUflex rates are diverse, so ODUflex can carry packet services of any rate. When carrying packet services of different rates, the rate of ODUflex is selected to the corresponding rate level (correspondingly occupying several time slots of HO OPUk), as shown in Figure 2, HO OPU2 includes eight 1.25G time slots, and ODUflex occupies 3 timeslots of HO OPU2 time slots, namely TS1, TS2 and TS4.

Since the packet service traffic has the characteristic of non-real-time change, the bandwidth requirement of the service layer container by the packet service is variable. Operators hope to dynamically adjust the channel bandwidth of the service layer according to customer service levels and customer data traffic needs, not only to improve the service quality of operators, but also to make full use of their resources to provide differentiated services to more customers. Therefore, in different time periods, ODUflex needs to provide different bandwidths to meet the different traffic of packet services, and it is necessary to adjust the ODUflex channel bandwidth when the packet services are continuous. This is the G.hao protocol (ODUflex lossless bandwidth adjustment) currently being formulated by ITU-T.

The HAO (Hitless Adjustment of ODUflex, ODUflex lossless adjustment) protocol solution completes the lossless bandwidth adjustment of ODUflex through LCR (LinkConnection Resize, link adjustment) and BWR (Bandwidth Resize, bandwidth adjustment), where LCR is responsible for each section of HO OPUk in the ODUflex path The BWR is responsible for end-to-end ODUflex bit rate adjustment.

Figure 3 shows a schematic diagram of a point-to-point symmetrical bandwidth ODUflex channel. The ODUflex path passes through two intermediate nodes from the source node to the sink node, which consists of 3 Link segments and 2 Matrix segments. The Link segment: In the HO ODU channel of ODUflex, the LC (Link Connection, link) segment between any two connected network nodes; Matrix segment: in the HO ODU channel carrying ODUflex, the cross-matrix connection segment in any network node; Link segment and The Matrix segment is the LC described in the text.

From the source node to the sink node, in the source node, the packet service is mapped into ODUflex through GFP-F, and then ODUflex is mapped into HO ODTU2.2 through GMP (as shown in Figure 3, it occupies TS1 and TS4 of HO ODU2 , here is for illustration only, not limitation). At the first intermediate node, ODUflex is demapped from HO ODU2 through GMP, and after crossover, ODUflex is mapped to HO ODTU3.2 again through GMP on the other side of the crossover matrix (as shown in Figure 3, so that it occupies HO TS5 and TS12 of ODU3 are only for illustration and not limitation). At the second intermediate node, ODUflex is demapped from HO ODU3 through GMP, and after crossover, ODUflex is mapped to HO ODTU2.2 again through GMP on the other side of the crossover matrix (as shown in Figure 3, so that it occupies HO ODU2 TS4, TS5, here is only for illustration, not limitation). In the sink node, ODUflex is demapped from HO ODU2 through GMP, and then the packet service is parsed from ODUflex through GFP-F. Similarly, from the sink node to the source node, the packet service is transmitted according to the same bandwidth distribution and path.

The HAO protocol in the prior art can achieve lossless bandwidth adjustment of ODUflex, and the lossless bandwidth adjustment of ODUflex is completed through LCR and BWR. For example, to realize the lossless bandwidth adjustment of the ODUflex path in Figure 3, the existing HAO protocol is used, in which the LCR is responsible for the bandwidth adjustment of each Link segment and Matrix segment in the ODUflex path, and completes the TS adjustment of the HO OPUk occupied by the ODUflex ; The BWR is responsible for adjusting the ODUflex bit rate from the source node to the sink node. Firstly, the connectivity detection is performed, and then the ODUflex bit rate adjustment is performed.

LCR and BWR complete ODUflex lossless bandwidth adjustment with the help of the defined adjustment protocol. LCR includes CTRL (control, control field), TPID (Tributary Port ID, tributary port ID), TSGS (Tributary Slot GroupStatus, tributary group status) fields; BWR includes TSCC (Tributary Slot Connectivity Check, branch connectivity detection), NCS (Network Connection Status, network response status), BWD_IND (Bandwidth Resize Indicator, bandwidth adjustment indication), RP (Protocol indicator, protocol identification) fields. Among them, RP, TSCC, CTRL, TPID, and TSGS are placed in TSOH in HO OPUk, located in 15 columns 1, 2, and 3 rows, and BWD_IND, NCS are placed in OPUflex overhead, as shown in Figure 4a and Figure 4b. Figure 4a shows the configuration Schematic diagram of adjustment overhead in OPUflex overhead; Figure 4b shows a schematic diagram of adjustment overhead placed in HO OPUk overhead.

Among them, CTRL occupies 2 bits and is used to transmit control signaling, 00 indicates IDLE signaling (ie, idle signaling), 01 indicates ADD signaling (ie, increase signaling), 10 indicates REMOVE signaling (ie, mobile signaling), 11 Indicates NORM signaling (that is, switching signaling); TPID occupies 7 bits, indicating the tributary port ID, which is used to indicate which group the current TS belongs to; TSGS occupies 1 bit, 1 indicates the OK state, 0 indicates the NOT-OK state, and is determined by the sink Generated, used to confirm the current status of the sink to the source; TSCC occupies 1 bit, used for connectivity detection, generated by the source node, and set to 1 when performing connectivity detection; NCS occupies 1 bit, indicating the response to the connectivity detection , generated by the sink node, based on the received different TSSC values, corresponding response indications are generated; BWD_IND occupies 2 bits, used to indicate the start and end of ODUflex bit rate adjustment; RP occupies 1 bit, used to indicate that the transmission is to adjust the protocol overhead; CRC5 And CRC3 is a cyclic redundancy check code; RES is a reserved bit.

In the prior art, there are two types of non-destructive channel bandwidth adjustment in a fault-free scenario: bandwidth increase and bandwidth decrease. When the bandwidth increases, each LC first performs HO TS adjustment respectively, that is, completes the LCR operation, and performs After the end-to-end connectivity detection, increase the ODUflex bit rate to complete the BWR operation; when the bandwidth decreases, first perform the end-to-end connectivity detection, then reduce the ODUflex bit rate to complete the BWR operation, and then perform HO TS adjustments for each LC , to complete the LCR operation.

In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the prior art only realizes the lossless adjustment of the ODUflex channel bandwidth in a non-failure scenario, but a link failure occurs during the ODUflex bandwidth adjustment process In the case of , the existing technology will be abnormally interrupted, so that the bandwidth status of each segment in the ODUflex path is inconsistent. Phenomenon 1: Some LCs have completed the TS adjustment and some LCs have not completed the TS adjustment coexistence phenomenon, resulting in an inconsistent state with the bandwidth allocation before the adjustment; Phenomenon 2: If the fault triggers the path protection switching, the ODUflex path changes, and the introduction of a new LC, resulting in the adjustment Inconsistent state of previous bandwidth allocation.

Contents of the invention

In order to solve the problem of normal processing and fallback of the HAO protocol in the case of a link failure, the present invention provides a robust and feasible ODUflex fault processing solution. When a fault occurs during the ODUflex lossless bandwidth adjustment, the ODUflex bandwidth adjustment is forced to stop abnormally, so that the bandwidth of each link in the ODUflex path is inconsistent with the state before or after adjustment. In order to keep the bandwidth of each link in the ODUflex path consistent with the pre-adjustment or post-adjustment state after a fault occurs, it is necessary to increase the adaptation processing of ODUflex lossless bandwidth adjustment after a fault occurs, including the ability to adapt to fault triggering The situation after protection switching. Described technical scheme is as follows:

An embodiment of the present invention provides a method for troubleshooting an optical channel bandwidth failure, the method comprising:

Determine whether the faulty link in the optical channel data ODUflex path has completed high-order time slot adjustment;

When the judgment result is that the link completes the high-order time slot adjustment, trigger the bandwidth adjustment of each link in the ODUflex path to the adjusted state of each link when the link is not faulty, and the flex indicates Any bit rate.

The embodiment of the present invention also provides an optical channel bandwidth fault processing device, the device comprising:

A judging module, configured to judge whether a faulty link in the optical channel data ODUflex path has completed high-order time slot adjustment;

The first processing module is configured to trigger the adjustment of the bandwidth of each link in the ODUflex path to the adjusted state without a fault when the judgment result of the judgment module is that the link has completed the high-order time slot adjustment, The flex represents an arbitrary bit rate.

The beneficial effect brought by the technical solution provided by the embodiment of the present invention is: when a link in the ODUflex path fails, by adjusting the bandwidth of each link in the ODUflex path, the bandwidth of each link in the ODUflex path remains the same. The state after adjustment is consistent under the fault, and the fault handling of ODUflex non-destructive adjustment is realized. The present invention expands the adaptation and processing capability of ODUflex non-destructive adjustment for faults, and eliminates the bandwidth and occurrence of each link in the ODUflex path when a link fails. The inconsistency of the state before the fault ensures that when the fault occurs, the ODUflex can still be adjusted normally, and the adaptability is strong.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic structural diagram of an OTN frame provided in the prior art;

Fig. 2 is the schematic diagram that ODUflex provided in the prior art occupies 3 time slots of HO OPU2;

FIG. 3 is a schematic diagram of a point-to-point symmetrical bandwidth ODUflex channel provided in the prior art;

Fig. 4a is a schematic diagram of adjustment overhead in OPUflex overhead in the prior art;

Fig. 4b is a schematic diagram of the adjustment overhead in the HO OPUk overhead in the prior art;

Fig. 5 is a flow chart of a method for handling a fault of lossless adjustment of optical channel bandwidth provided in Embodiment 1 of the present invention;

FIG. 6 is a flow chart of a method for handling faults of lossless adjustment of optical channel bandwidth provided in Embodiment 2 of the present invention;

Fig. 7 is a flow chart of the normal end processing of ODUflex bandwidth adjustment provided in Embodiment 2 of the present invention;

FIG. 8 is another flow chart of the ODUflex bandwidth adjustment failure normal end processing provided in Embodiment 2 of the present invention;

Fig. 9 is a flow chart of the abnormal rollback processing of the ODUflex bandwidth adjustment provided in Embodiment 2 of the present invention;

Fig. 10 is another flow chart of the abnormal rollback processing of the ODUflex bandwidth adjustment provided in Embodiment 2 of the present invention;

Figure 11 is a schematic diagram of the HAO AIS pattern provided in Embodiment 2 of the present invention;

Figure 12 is a schematic diagram of the HAO BDI pattern provided in Example 2 of the present invention;

FIG. 13 is a schematic diagram of LC bidirectional faults in the ODUflex path provided in Embodiment 3 of the present invention;

Fig. 14 is a schematic diagram of fault processing for completing HO TS adjustment by the bidirectional fault LC provided in Embodiment 3 of the present invention;

Fig. 15 is a schematic diagram of the fault handling of the two-way fault LC that has not completed the HOTS adjustment provided in Embodiment 3 of the present invention;

FIG. 16 is a schematic diagram of LC unidirectional fault in the ODUflex path provided in Embodiment 4 of the present invention;

Fig. 17 is a schematic diagram of fault processing for completing HO TS adjustment by the unidirectional fault LC provided in Embodiment 4 of the present invention;

Fig. 18 is a schematic diagram of the fault handling of the one-way fault LC that has not completed the HOTS adjustment provided in Embodiment 4 of the present invention;

Fig. 19 is a schematic structural diagram of a device for lossless adjustment of optical channel bandwidth provided in Embodiment 5 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The existing technology is to perform ODUflex lossless bandwidth adjustment in a non-failure scenario. When a link failure occurs, the HAO protocol processing is generally interrupted, and some LCs have completed TS adjustments and some LCs have not completed TS adjustments coexist, resulting in ODUflex The bandwidth status of each section in the path is inconsistent, which is inconsistent with the state of bandwidth allocation before adjustment (the reason is that in the prior art, when completing the TS adjustment of each section of HO OPUk in the ODUflex path, each HO OPUk section is independently performed by each HO OPUk section through the LCR and processed separately. Therefore, at the moment of link failure, there will be a phenomenon that some LCs complete the TS adjustment and some LCs do not complete the TS adjustment coexist). Therefore, it is necessary for the HAO mechanism to be able to adapt to fault handling. When such a situation occurs, it can continue normal processing or fall back (that is, restore) to a consistent state before adjustment.

In addition, when a link fails, protection switching may be triggered, but due to the different protection mechanisms adopted in different networks, the ODUflex path may introduce a new LC (after adjustment or not), resulting in an inconsistent state with the bandwidth allocation before adjustment (The reason is that the existing technology is strongly related to the ODUflex path when ODUflex lossless bandwidth adjustment is performed. Each HO OPUk in the ODUflex path needs to participate in the TS adjustment of the HO OPUk. If protection switching is triggered, a new ODUflex path may be introduced. The newly introduced LC may have adjusted or unadjusted bandwidth, and the bandwidth of each segment in the ODUflex path is inconsistent with the state before or after adjustment). So it cannot be avoided that HAO can continue to work normally, because its adjustment is strongly related to each node it passes through.

In order to keep the bandwidth state of each segment in the ODUflex path consistent with the state before or after adjustment after a fault occurs, the HAO mechanism needs to be able to adapt to fault handling, including protection switching triggering. When a fault occurs, it can continue to process normally until the end of the adjustment or an abnormal rollback (recovery) to the consistent state before the adjustment, so the solution of the present invention is proposed.

Example 1

In the embodiment of the present invention, when a link failure occurs in ODUflex, the HAO protocol processing is generally forced to be interrupted, and some links in the ODUflex path have completed the high-order time slot adjustment, and some links have not completed the high-order time slot adjustment coexistence phenomenon . Troubleshooting based on the faulty LC includes two aspects. On the one hand, the faulty LC has completed the HOTS adjustment, and the ODUflex bandwidth adjustment can continue to be processed until the adjustment ends normally; on the other hand, the faulty LC has not completed HO TS adjustment, when troubleshooting, the ODUflex bandwidth adjustment can be abnormally rolled back or restored to the same state as before the adjustment.

In practical applications, when a link failure occurs, the network management plane or the control plane can generate a fault command. The fault command can generate different commands based on judging whether the faulty link has completed high-order time slot adjustment. For example, the faulty LC completes the HO When TS is adjusted, a normal end processing instruction is generated; when a faulty LC has not completed HO TS adjustment, an abnormal fallback processing instruction is generated; different instructions can also be generated through a specific program, for example, when a fault occurs, an abnormal fallback processing instruction can be generated uniformly wait.

Referring to FIG. 5, an embodiment of the present invention provides a method for troubleshooting an optical channel bandwidth failure, the method including:

Step 101: Determine whether the faulty link in the optical channel data ODUflex path has completed high-order time slot adjustment;

Step 102: When the judgment result is that the link has completed the high-order time slot adjustment, trigger the bandwidth adjustment of each link in the ODUflex path to the adjusted state of each link when the fault does not occur, and flex represents any bit rate.

In the method provided by the embodiment of the present invention, when a link in the ODUflex path fails, by adjusting the bandwidth of each link in the ODUflex path, the bandwidth of each link in the ODUflex path remains consistent with the adjusted state when no fault occurs , realizing the fault handling of ODUflex lossless adjustment, the present invention expands the adaptation processing capability of ODUflex lossless adjustment for faults, and eliminates the inconsistency between the bandwidth of each link in the ODUflex path when a link fails and the state before the failure occurs, It is guaranteed that when a fault occurs, ODUflex can still be adjusted normally and has strong adaptability.

Example 2

Referring to FIG. 6, an embodiment of the present invention provides a method for troubleshooting an optical channel bandwidth fault, and the method specifically includes:

Step 201: Determine whether the faulty link in the ODUflex path has completed high-order time slot adjustment;

Specifically, when the lossless bandwidth adjustment is performed on the ODUflex path, each link in the ODUflex path performs high-order time slot adjustment respectively. When a link is faulty, the faulty link in the ODUflex path may or may not have completed the high-order time slot adjustment. In this embodiment of the present invention, according to whether the faulty link has completed the high-order time slot adjustment, a Different adjustment strategies.

In practical applications, when a link in the ODUflex path fails, the network management plane or the control plane generates a fault handling instruction. The fault handling instruction can generate different instructions based on whether the faulty link has completed high-order time slot adjustment. When the faulty link completes the high-order time slot adjustment, a normal end processing instruction is generated; when the faulty link has not completed the high-order time slot adjustment, an abnormal rollback processing instruction is generated. The network management plane or the control plane may also generate different fault handling instructions through a specific program, for example, when a fault occurs, an abnormal rollback processing instruction may be uniformly generated.

The bandwidth adjustment of each link in the ODUflex path includes the bandwidth adjustment of each link in the ODUflex path, and the ODUflex bit rate adjustment from the source node to the sink node in the ODUflex path.

Step 202: When the judgment result is that the high-order time slot adjustment of the faulty link is completed, the bandwidth of each link in the ODUflex path is triggered to be adjusted to the adjusted state without the fault, and flex represents any bit rate;

Specifically, if the fault instruction is a normal end processing instruction, the fault that triggers the bandwidth adjustment of each link in the ODUflex path ends normally, so that the ODUflex bandwidth is consistent with the adjusted state when no fault occurs.

Wherein, in the embodiment of the present invention, when the LC completes the HO TS adjustment, the normal end processing of the ODUflex bandwidth adjustment failure includes two processing methods:

Referring to Figure 7, when the faulty LC in the ODUflex path completes the HOTS adjustment, the ODUflex bandwidth adjustment fault ends normally and the processing method 1 is as follows:

111. The network element connected to the faulty link in the ODUflex path reports the fault information to the network management system, and the fault information includes the information that the high-order time slot adjustment of the faulty link has been completed;

112. After receiving the fault information, the network management system issues a forced switching instruction to each network element in the ODUflex path according to the fault information;

In this solution, because the link where the ODUflex path fails has completed the high-order time slot adjustment, it is only necessary to adjust the network elements connected to the ODUflex path that have not completed the high-order time slot adjustment to the preset target bandwidth. The preset target bandwidth is the bandwidth of the faulty link after high-order time slot adjustment.

113. After each network element of the ODUflex path receives the forced switching command, it performs forced high-order time slot switching on the connected link that has not completed the high-order time slot adjustment, and adjusts the link that has not completed the high-order time slot adjustment to the preset target bandwidth;

Among them, the network element connected to the LC that has not completed the HO TS adjustment in the ODUflex path performs a handover operation. After this step is completed, the bandwidth of all links in the ODUflex path is adjusted to the preset target bandwidth, the bandwidth adjustment is completed, and the ODUflex bit rate adjustment from the source node to the sink node in the ODUflex path is performed.

114. After receiving the forced switching instruction, the source node switches the bit rate of the ODUflex path to the preset target rate, and completes the fault handling of the ODUflex path;

115. After the handover of each network element in the ODUflex path is completed, an indication of the completion of the forced handover processing is reported to the network management system.

Referring to Figure 8, when the faulty LC in the ODUflex path completes the HOTS adjustment, the ODUflex bandwidth adjustment fault ends normally and the processing method 2 is as follows:

121. The trigger adjustment protocol loopback processing of the faulty link in the ODUflex path is to obtain the bandwidth adjustment protocol information extracted from the uplink, and send the bandwidth adjustment protocol information to the downlink;

122. The downlink continues processing based on the HAO adjustment protocol until the bandwidth adjustment is completed.

Wherein, the HAO adjustment protocol includes a link adjustment protocol and a bandwidth adjustment protocol, and the downlink continues processing based on the link adjustment protocol and the bandwidth adjustment protocol until the bandwidth adjustment is completed.

Step 203: When the judgment result is that the high-order time slot adjustment of the failed link has not been completed, the bandwidth of each link in the ODUflex path is triggered to fall back to the state before the adjustment of each link when the link does not fail.

Specifically, if the fault command is an abnormal rollback command, the bandwidth of each link in the ODUflex path is triggered to roll back to the state before adjustment when no fault occurs.

Among them, in the embodiment of the present invention, there are two methods for the abnormal rollback processing of the ODUflex bandwidth adjustment:

Referring to Figure 9, when the faulty LC in the ODUflex path has not completed the HOTS adjustment, the ODUflex bandwidth adjustment fault exception rollback method 1:

211. The network element of the faulty link in the ODUflex path reports the fault information to the network management system, and the fault information includes the unfinished high-order time slot adjustment information of the faulty link;

212. After receiving the fault information, the network management system issues an adjustment and rollback instruction to each network element in the ODUflex path;

Wherein, the fault adjustment of the ODUflex bandwidth adjustment includes the bandwidth adjustment of each link in the ODUflex path, and the ODUflex bit rate adjustment from the source node to the sink node in the ODUflex path.

In this solution, because the faulty link in the ODUflex path has not completed the high-order time slot adjustment, it is only necessary to roll back the network elements connected to the ODUflex path that have completed the high-order time slot adjustment to the original bandwidth. The original bandwidth refers to the bandwidth of the faulty link before high-order time slot adjustment is performed.

213. After each network element in the ODUflex path receives the adjustment rollback command, it performs forced high-order time slot switching on the connected links that have completed the high-order time slot adjustment, and switches the link that has completed the high-order time slot adjustment. to the original bandwidth;

Among them, the network element connected to the LC that has completed the HO TS adjustment in the ODUflex path performs a handover operation. After this step is completed, the bandwidth of all links in the ODUflex path is adjusted to the original bandwidth before the adjustment of the high-order time slot, and the bandwidth adjustment is completed.

214. After receiving the adjustment rollback command, the network element serving as the source node switches the ODUflex bit rate to the original rate, and completes ODUflex fault handling;

Wherein, step 214 adjusts the ODUflex bit rate from the source node to the sink node in the ODUflex path, and the operation is only performed when the bandwidth of the HOTS is reduced, and the operation is not required when the bandwidth is increased. Because when the bandwidth increases, first adjust the HOTS of each LC, and then adjust the ODUflex bit rate. At this time, because the LC has not completed the HOTS adjustment, that is, the ODUflex bit rate has not started to adjust, so only the LC fallback process is performed, and it is only necessary to restore each LC to the state before the adjustment.

When the bandwidth is reduced, after each LC backs off, the source node initiates a traffic adjustment inverse operation to restore the traffic to the rate before the adjustment.

215. After the adjustment and fallback processing of each network element in the ODUflex path is completed, report the adjustment and fallback processing completion indication to the network management system.

Referring to Figure 10, when the faulty LC in the ODUflex path has not completed the HOTS adjustment, the ODUflex bandwidth adjustment fault exception fallback method two:

221. The network element connected to the failed link in the ODUflex path sends the first indication signal to the direction of the source node;

Wherein, the first indication signal may be an alarm indication signal HAO AIS;

222. After receiving the first indication signal, the source node returns the second indication signal to the peer sink node;

Wherein, the second indication signal may be a backward defect indication HAO BDI, and the HAO AIS and HAO BDI are used to indicate that the faulty LC has not completed the HO TS adjustment;

223. After receiving the first indication signal or the second indication signal, the end node triggers the bandwidth adjustment fallback process of each link in the ODUflex path.

Among them, triggering the bandwidth adjustment fallback processing of each link in the ODUflex path specifically includes triggering each link of the ODUflex path to process according to the link adjustment protocol and the bandwidth adjustment protocol, so that the status of each link in the ODUflex path is the same as that of the non-failure condition. The state before adjustment is the same.

Specifically, for the HAO AIS/HAO BDI indication, the embodiments of the present invention may adopt but not limited to the following methods:

Inheriting the NCS transmission mode in the BWR protocol of HAO, the HAO AIS and HAO BDI are also placed in the 15th column, 1st, 2nd, and 3rd rows of the ODUflex frame, as shown in Figure 11 and Figure 12. HAO AIS and HAO BDI patterns are binary 01 interleaved, retain the original CRC3 check, for the HAO AIS pattern, the first 3 bits of 15 columns and 1 row are 101, the first 3 bits of 15 columns and 2 rows are 010, 15 The first 3 bits of column 3 and row are CRC3, and the other positions of column 15 are reserved; for HAO BDI images, the first 3 bits of column 1 and row 15 are 010, the first 3 bits of column 15 and row 2 are 101, and columns 15 and 3 The first 3 bits of the row are CRC3, and the rest of the 15 columns are reserved.

The HAO AIS and HAO BDI in the technical solution of the present invention are not limited to being placed in the ODUflex overhead, but can also be placed in the TSOH of the HO OPUk.

For LC fallback processing, it refers to performing a handover operation on the TS that has undergone HO TS adjustment, and switching it to the state before the adjustment, which can be called an inverse handover operation at this time. The fallback process of the ODUflex bandwidth adjustment may be adopted but not limited to the following methods.

For the LC that has completed the HO TS increase adjustment, perform the reverse switching operation of TS reduction adjustment; for the LC that has completed the HO TS reduction adjustment, perform the reverse switching operation of TS increase adjustment, the embodiment of the present invention can use the HAO adjustment LCR protocol to complete the HO TS adjusts the way of inverse switching operation, as follows:

a. Based on CTRL, TPID, TSGS signaling indication, wherein CTRL={ADD, REMOVE, NORM, IDLE}, means adding command, deleting command, switching command, idle; TPID means serial number information; TSGS={ACK, NACK}, Indicates that the response command is agreed, and the response command is not agreed.

b. The adjustment signaling is carried in the RCOH corresponding to the TS to be added or the TS to be deleted;

c. After the NORM instruction, complete the inverse switching of the TS at the boundary of the next multiframe, and return to the state before the adjustment.

The LC fallback processing in the technical solution of the present invention can also be implemented by forced switching in addition to the above-described manner. The network management system receives the fault information reported by the network element of the failed LC, and sends a forced switching command to all network elements in the ODUflex path according to the fault information, so that the network elements adjust to the original bandwidth. For example, when the original bandwidth is 3 TS, the network management system will directly switch from the current 5 TS to 3 TS after receiving the fault information reported by the network element of the faulty LC, without going through the negotiation of the LCR protocol. HO TS toggle adjustment.

For fault information, the embodiment of the present invention proposes the type of fault information and the encoding method of fault information, such as the fault information encoding shown in Table 1:

Table 1 Fault information coding

The types of fault information include mismatch of adjustment protocol information at both ends, LC not handshaking, LC handshake completed, LC unadjusted, LC unadjusted, LC adjustment completed, ODUflex rate not adjusted, ODUflex rate adjustment, and ODUflex rate adjusted, the fault The information includes one or more of the types of failures.

The embodiment of the present invention also encodes the fault information, and encodes whether the faulty LC is HOTS adjusted or not. There are many ways to encode the fault information, and the present invention does not limit it here. Take Table 1 as an example To illustrate, the highest bit of the fault information code indicates whether the HO TS has been adjusted. In Table 1, the highest bit is 0, indicating that the HO TS has been adjusted, and the highest bit is 1, indicating that the HO TS has not been adjusted.

In the embodiment of the present invention, taking Fig. 13 as an example, assuming that the LC has a bidirectional fault (B<->C segment fault), based on whether the faulty LC (B<->C segment) has completed the HO TS adjustment, the first method is adopted Perform normal end processing or abnormal rollback processing of ODUflex bandwidth adjustment faults.

After receiving the fault information reported by the failed LC, the network management system issues a forced switching command. For example, when receiving "000000001", "000010000", "000100000", "001000000" and "010000000", the forced switching command is triggered, then The LC that has not completed the HO TS adjustment will perform HOTS forced switching to adjust to the preset target bandwidth; the source node will switch the ODUflex bit rate to the preset target rate after receiving the adjustment forced switching command.

For example, when the network management system receives "100000001", "100000010", "100000100", "100001000", "100100000", "101000000", "110000000", it triggers a fault rollback command, and each network element receives the adjustment rollback command Afterwards, the adjacent LC that has completed the HOTS adjustment is forced to perform HOTS reverse switching to adjust to the original bandwidth; the source node switches the ODUflex bit rate to the original rate after receiving the adjustment rollback command.

The types of faults in the embodiments of the present invention are not limited to the types described above, and the encoding form of fault information is not limited to the methods described above.

In the method provided by the embodiment of the present invention, when a link in the ODUflex path fails, the bandwidth of each link in the ODUflex path is triggered to adjust, so as to keep the adjusted state consistent with the state after no failure occurs, and ODUflex non-destructive adjustment is realized. The present invention expands the adaptability of ODUflex non-destructive adjustment for faults, eliminates the inconsistency between the bandwidth of each link in the ODUflex path and the state before or after adjustment in the event of a fault, and ensures that ODUflex can still be adjusted normally in the event of a fault End or return to the state before the adjustment, and can adapt to the situation after the fault triggers the protection switching, and has strong adaptability.

Example 3

In practical applications, various faults may occur in the bandwidth of the optical channel, which are generally divided into two-way faults and one-way faults. The solution of the present invention will be described below using the two-way faults in the optical channel bandwidth.

In this embodiment, it is assumed that the LC has a bidirectional fault (B<->C segment fault), refer to the fault handling of the ODUflex bandwidth adjustment shown in FIG. 13 .

If the faulty LC (B<->C segment) completes the HOTS adjustment, as shown in Figure 14, adopt method 2 as follows:

1. The network elements connected to the faulty LC in the ODUflex path, that is, the B-side and the C-side, perform the adjustment protocol loopback respectively, and insert the BWR adjustment protocol information extracted from the uplink back into the downlink; at this time, the original ODUflex The path (A<->B<->C<->D) is divided into left and right two sections to adjust the protocol transfer path, that is, A->B->A and D->C->D; as shown in Figure 14 , the dotted line in the figure is the transfer path of the adjustment protocol;

2. The new ODUflex path, that is, the adjustment protocol transmission paths A->B->A and D->C->D respectively continue to adjust the protocol processing until the adjustment ends normally, thus completing the ODUflex adjustment.

If the faulty LC (B<->C segment) has not completed the HOTS adjustment, as shown in Figure 15, adopt method 2 to deal with it as follows:

1. Network elements at both ends of the LC where a fault occurs in the ODUflex path generate HAO AIS to source nodes A and D respectively;

2. After receiving the HAO AIS, the source node A(D) sends back the HAO BDI to the peer sink node D(A);

3. After receiving the HAO AIS, the end node A(D) triggers the ODUflex bandwidth adjustment fallback process;

3.1. Initiate RP=0, indicating that each node in the ODUflex path ends the adjustment, and each LC performs a rollback process, that is, rolls back to the state before the adjustment;

3.2. When the bandwidth increases, only LC fallback processing is performed;

Among them, because in the case of bandwidth increase, the HO TS adjustment of each LC is performed first, and then the ODUflex bit rate adjustment is performed. At this time, the faulty LC has not completed the HO TS adjustment, that is, the ODUflex bit rate adjustment has not yet started, so only Restore each LC to the state before adjustment.

3.3. In the case of bandwidth reduction, after the fallback processing of each LC is completed, the source end initiates a flow adjustment reverse operation to restore the flow rate to the flow rate before adjustment.

Example 4

The solution of the present invention will be described below in the case of a unidirectional fault occurring in the bandwidth of the optical channel.

In this embodiment, it is assumed that the faulty LC in the ODUflex path has a unidirectional fault (C->B segment fault), refer to the fault handling of the ODUflex bandwidth adjustment shown in FIG. 16 .

If the faulty LC (C->B section) completes the HOTS adjustment, as shown in Figure 16, adopt method 2 as follows:

1. The B side of the LC that fails in the ODUflex path performs an adjustment protocol loopback, and inserts the BWR adjustment protocol information extracted from the uplink back into the downlink;

Among them, the loopback on the left side of the fault (A->B->A) is normally processed until the adjustment is completed; the transmission path of the ODUflex adjustment protocol is shown by the dotted line in Figure 17.

2. The adjustment protocol information of the uplink still maintains A->D transmission (the right side of the fault does not trigger a loopback), and the sink D uses the adjustment protocol change information transmitted by the source A, and the part on the right side of the fault can also complete the adjustment process until the end.

Among them, since the HAO protocol itself is a two-way symmetrical bandwidth adjustment, the uplink and downlink remain symmetrical during the adjustment process, and the protocol information transmission is symmetrical. Therefore, the sink D can also complete the right side of the fault by receiving the normal adjustment protocol change information on the left side of the fault. Part of the adjustment process until the end.

If the faulty LC (C->B segment) in the ODUflex path has not completed the HOTS adjustment, as shown in Figure 18, adopt method 2 to deal with it as follows:

1. In the ODUflex path, the terminal B of the faulty LC generates HAO AIS to the source node A;

2. After receiving the HAO AIS, the source node A sends back the HAO BDI to the peer sink node D;

3. After receiving the HAO AIS, the source node A triggers the ODUflex bandwidth adjustment fallback process;

3.1. Initiate RP=0, indicating that each node in the ODUflex path ends the adjustment, and each LC performs a rollback process, that is, rolls back to the state before the adjustment;

3.2. When the bandwidth increases, only LC fallback processing is performed;

Among them, due to the increase of bandwidth, the HO TS adjustment of each LC is performed first, and then the ODUflex bit rate adjustment is performed. At this time, the faulty LC has not completed the HO TS adjustment, that is, the ODUflex bit rate adjustment has not yet started. Therefore, only the Each LC can be restored to the state before adjustment.

3.3. In the case of bandwidth reduction, after the fallback processing of each LC is completed, the source end initiates a flow adjustment reverse operation to restore the flow rate to the flow rate before adjustment.

4. After the sink node D detects the HAO BDI, perceives that the link in the A direction is faulty and has not completed the HOTS adjustment, it triggers the ODUflex bandwidth adjustment fallback process; the processing operation is the same as step 3.

Example 5

Referring to FIG. 19, an embodiment of the present invention provides an optical channel bandwidth fault processing device, the device includes a judging module 301 and a first processing module 302;

A judging module 301, configured to judge whether the link that fails in the optical channel data ODUflex path has completed high-order time slot adjustment;

The first processing module 302 is used to trigger the adjustment of the bandwidth of each link in the ODUflex path to the adjusted state without failure when the judgment result of the judging module 301 is that the link has completed the high-order time slot adjustment, and flex represents any bit rate.

Wherein, the device further includes a second processing module 303, which is used to trigger the bandwidth rollback of each link in the ODUflex path until the link does not occur when the judgment result of the judgment module 301 is that the link has not completed the high-order time slot adjustment. The status of each link before adjustment under fault conditions.

Specifically, the first processing module 302 specifically includes a reporting unit and a switching unit,

The reporting unit is used to report the fault information to the network management system, so that the network management system can issue a forced switching command to all network elements in the ODUflex path according to the fault information. The fault information includes sending the faulty link to complete the high-order time slot adjustment information, the reporting unit is the network element connected to the link that completes the high-order time slot adjustment in the ODUflex path;

The switching unit is used to enable all network elements in the ODUflex path to forcibly switch the bandwidth of the link that has not completed the high-order time slot adjustment in the ODUflex path according to the forced switching instruction, adjust to the target bandwidth, and change the bit rate of the ODUflex path The rate switches to the target rate.

Wherein, the first processing module 302 specifically includes a sending unit and an adjusting unit,

The sending unit is used to send the bandwidth adjustment protocol information extracted from the uplink to the downlink to obtain the transfer path of the adjustment protocol. The sending unit is a downlink network element connected to a failed link in the ODUflex path;

The adjustment unit is configured to make each link in the transmission path of the adjustment protocol perform bandwidth adjustment protocol processing, and the bandwidth of each link in the transmission path of the adjustment protocol is consistent with the adjusted state when no fault occurs.

Wherein, the second processing module 303 specifically includes a reporting unit and an adjusting unit,

The reporting unit is used to report fault information to the network management system, so that the network management system sends instruction information to all network elements in the ODUflex path according to the fault information. Network elements connected by roads;

The adjustment unit is used to enable all network elements in the ODUflex path to forcibly switch the bandwidth of links that have completed high-order time slot adjustment in the ODUflex path according to the instruction information, adjust to the original bandwidth, and change the bit rate of the ODUflex path The rate falls back to the original rate.

Wherein, the second processing module 303 specifically includes a sending unit, a first adjusting unit, and a second adjusting unit,

A sending unit, configured to cause a downlink network element connected to a failed link in the ODUflex path to send a first indication signal to the source node in the ODUflex path;

The first adjustment unit is used for the source node to send the second indication signal to the peer sink node after receiving the first indication signal, and perform processing according to the link adjustment protocol and the bandwidth adjustment protocol, so that the status of each link in the ODUflex path It is consistent with the state before adjustment without failure;

The second adjustment unit is used to process the end sink node according to the link adjustment protocol and the bandwidth adjustment protocol after receiving the second indication signal, so that the state of each link in the ODUflex path is consistent with the state before adjustment without failure .

The device provided by the embodiment of the present invention realizes ODUflex non-destructive adjustment by triggering the bandwidth adjustment of each link in the ODUflex path when a link in the ODUflex path fails, keeping the state consistent with the adjusted state when no fault occurs The present invention expands the adaptive processing capability of ODUflex non-destructive adjustment for faults, eliminates the phenomenon that the bandwidth of each segment in the ODUflex path is consistent with the state before or after adjustment when a fault occurs, and ensures that ODUflex can still be adjusted or restored normally when a fault occurs to the state before the adjustment, and can adapt to the situation after the fault triggers the protection switching, and has strong adaptability.

The device and system provided in this embodiment may specifically belong to the same idea as the method embodiment, and its specific implementation process is detailed in the method embodiment, and will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (13)

1. A method for troubleshooting optical channel bandwidth, characterized in that the method comprises: Determine whether the faulty link in the optical channel data ODUflex path has completed high-order time slot adjustment; When the judgment result is that the link completes the high-order time slot adjustment, trigger the bandwidth adjustment of each link in the ODUflex path to the adjusted state of each link when the link is not faulty, and the flex indicates Any bit rate. 2. The method according to claim 1, wherein the triggering of adjusting the bandwidth of each link in the ODUflex path to an adjusted state without a failure specifically includes: In the ODUflex path, the network elements connected to the links that have completed the high-order time slot adjustment report fault information to the network management system, so that the network management system downloads all network elements in the ODUflex path according to the fault information. Sending a forced switching instruction, the fault information includes information that the faulty link has completed high-order time slot adjustment; All network elements in the ODUflex path switch the bandwidth of each link connected to all network elements in the ODUflex path that have not completed high-order time slot adjustment forcibly according to the forced switching instruction, adjust to the target bandwidth, and switch the ODUflex The bit rate of the path is switched to the target rate. 3. The method according to claim 1 or 2, wherein the triggering the adjustment of the bandwidth of each link in the ODUflex path to the adjusted state without failure specifically includes: The downlink network element connected to the failed link in the ODUflex path sends the bandwidth adjustment protocol information extracted from the uplink to the downlink, and obtains the transfer path of the adjustment protocol; Each link in the transmission path of the adjustment protocol is processed according to the link adjustment protocol and the bandwidth adjustment protocol, so that the state of each link in the transmission path of the adjustment protocol is consistent with the state after adjustment without failure. 4. The method according to any one of claims 1-3, wherein the method further comprises: When the judgment result is that the link has not completed the high-order time slot adjustment, the bandwidth of each link in the ODUflex path is triggered to fall back to the state before the adjustment of each link when the link is not faulty. 5. The method according to claim 4, wherein the triggering the bandwidth of each link in the ODUflex path to fall back to the state before adjustment under no fault occurs specifically includes: Network elements connected to links that have not completed high-order time slot adjustment in the ODUflex path report fault information to the network management system, so that the network management system reports fault information to all network elements in the ODUflex path according to the fault information issuing instruction information, where the failure information includes information that the link has not completed high-order time slot adjustment; All network elements in the ODUflex path switch the bandwidth of each link in the ODUflex path forcibly according to the instruction information, adjust to the original bandwidth, and return the bit rate of the ODUflex path to the original There is a rate. 6. The method according to claim 4 or 5, wherein the triggering the bandwidth of each link in the ODUflex path to fall back to the state before adjustment under no fault occurs specifically includes: The downlink network element connected to the failed link in the ODUflex path sends a first indication signal to the source node in the ODUflex path; After the source node receives the first indication signal, it sends a second indication signal to the peer sink node, and performs processing according to the link adjustment protocol and the bandwidth adjustment protocol, so that the state of each link in the ODUflex path is consistent with The state before adjustment is the same when there is no failure; After receiving the second indication signal, the opposite end sink node performs processing according to the link adjustment protocol and the bandwidth adjustment protocol, so that the state of each link in the ODUflex path is consistent with the state before adjustment without failure. 7. The method according to claim 2 or 5, wherein the fault information reported by the network element includes: the fault information that the adjustment protocol information of both ends does not match, the fault information that the link has not been handshaked, and the end of the link handshake. One or A variety of fault information, each fault information corresponds to a fault code information. 8. A fault processing device for optical channel bandwidth, characterized in that the device comprises: A judging module, configured to judge whether a faulty link in the optical channel data ODUflex path has completed high-order time slot adjustment; The first processing module is configured to trigger the adjustment of the bandwidth of each link in the ODUflex path to the adjusted state without a fault when the judgment result of the judgment module is that the link has completed the high-order time slot adjustment, The flex represents an arbitrary bit rate. 9. The device according to claim 8, wherein the first processing module specifically comprises: A reporting unit, configured to report fault information to a network management system, so that the network management system issues a forced switching instruction to all network elements in the ODUflex path according to the fault information, and the fault information includes the fault The information about the link completing the high-order time slot adjustment, the reporting unit is a network element connected to the link that completes the high-order time slot adjustment in the ODUflex path; A switching unit, configured to enable all network elements in the ODUflex path to forcibly switch the bandwidth of links that have not completed high-order time slot adjustment in the ODUflex path according to the forced switching instruction, adjust to the target bandwidth, and The bit rate of the ODUflex path is switched to the target rate. 10. The device according to claim 8 or 9, wherein the first processing module specifically comprises: A sending unit, configured to send the bandwidth adjustment protocol information extracted from the uplink to the downlink to obtain the transfer path of the adjustment protocol, the sending unit being a downlink network element connected to a failed link in the ODUflex path; The adjustment unit is configured to make each link in the adjustment protocol transfer path perform bandwidth adjustment protocol processing, and the bandwidth of each link in the adjustment protocol transfer path is consistent with the adjusted state when no fault occurs. 11. The device according to claim 8, further comprising a second processing module, configured to trigger The bandwidth of each link in the ODUflex path falls back to the state before the adjustment of each link when the link does not fail. 12. The device according to claim 11, wherein the second processing module specifically comprises: The reporting unit is used to report fault information to the network management system, so that the network management system sends instruction information to all network elements in the ODUflex path according to the fault information, and the reporting unit is not completed in the ODUflex path Network elements connected to links with high-order slot adjustments; The adjustment unit is configured to enable all network elements in the ODUflex path to forcibly switch the bandwidth of the link in the ODUflex path that has completed the high-order time slot adjustment according to the instruction information, and adjust it to the original bandwidth, And the bit rate of the ODUflex path is rolled back to the original rate. 13. The device according to claim 11 or 12, wherein the second processing module specifically comprises: a sending unit, configured to cause a downlink network element connected to a failed link in the ODUflex path to send a first indication signal to a source node in the ODUflex path; The first adjustment unit is configured to send the second indication signal to the peer sink node after the source node receives the first indication signal, and perform processing according to the link adjustment protocol and the bandwidth adjustment protocol, so that the ODUflex path The state of each link in the link is consistent with the state before adjustment when no fault occurs; The second adjustment unit is configured to perform processing according to the link adjustment protocol and the bandwidth adjustment protocol after the opposite sink node receives the second indication signal, so that the status of each link in the ODUflex path is the same as that without failure The state before the adjustment is the same.

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