CN115766462A - Bandwidth adjusting method based on optical transport network link and storage medium - Google Patents
Bandwidth adjusting method based on optical transport network link and storage medium Download PDFInfo
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Abstract
The invention relates to a bandwidth adjusting method and a storage medium based on an optical transport network link, which comprises the following steps that a control plane configures OTUk service and enables LCAS function; a control plane creates a VCG and binds an OTUk time slot ODUi; the link establishment signal of LCAS is pressed into the overhead of the OTU layer; a control plane initiates an adjustment request to an OTUk link timeslot ODUi; the source VCG returns the member state and sends out a reordering confirmation signal; the sink VCG adjusts the member status according to the monitoring signal. The bandwidth adjusting method and the storage medium based on the optical transport network link of the invention configure OTUk services for the OTN link, bind all time slots ODUi in the OTN link with VCG, enable LCAS function in VCG, press LCAS message into OTU layer overhead, transfer negotiation message through the OTN link, know the state of each ODUi. And then according to the increase or decrease of the OTN link time slot ODUi, the bandwidth size of the OTN link is regulated to make the maximum utilization of the whole link resource.
Description
Technical Field
The present invention relates to the field of network communication technologies, and in particular, to a bandwidth adjustment method and a storage medium based on an optical transport network link.
Background
The Optical Transport Network (OTN) technology is a product of fusion of an electrical network and a full optical network, and transplants the powerful and complete OAM concept and function of SDH into a WDM optical network, thereby effectively making up for the deficiencies of the existing WDM system in the aspects of performance monitoring, maintenance and management. The OTN technology can support transparent transmission of client signals, high-bandwidth multiplexing switching and configuration, has strong overhead support capability, provides strong OAM function, supports multilayer nested series connection monitoring (TCM) function and has Forward Error Correction (FEC) support capability.
The OTN is a standard frame format established by the international standard organization ITU for optical transport networks. The OTN is composed of a plurality of layers of frame formats, the layers are in a nested relation, and a bottom layer is wholly contained in a high layer. OTUs are classified into OTUk (k =1,2,3) according to rate class. OTUk has the same frame structure as shown in fig. 1, and the length of OTUk frame is fixed, and has 4 rows and 4080 columns in byte unit, and 4 × 4080=16320 bytes in total. The OTUk frame further includes two layers of frame structures, which are respectively an ODU and an OPU, where the inclusion relationship between the two layers is OTU > ODU > OPU, the OPU is completely included in the ODU layer, and the ODU is completely included in the OTU layer. The OTUk frame consists of three parts, namely an OTUk overhead part, an ODUk frame and an OTUk FEC. The ODUk frame consists of an ODUk overhead and an OPUk frame, and the OPUk frame consists of an OPUk payload and an OPUk overhead, so that a three-layer frame structure of OTUk-ODUk-OPUk is formed. The multiplexing relationship is: when a plurality of low-speed ODUi are converged into 1 high-speed ODUk, the low-speed ODUi is completely loaded into a payload part of the high-speed ODUk, and the overheads of the low-speed ODUi and the high-speed ODUk are independent.
LCAS is proposed by ITU-T to solve the problem of dynamic bandwidth allocation, and the problem of inconvenient fixed bandwidth use is solved by binding a plurality of VCs to use simultaneously by adopting a VC cascade technology. The mechanism can increase and decrease the bandwidth nondestructively through the controller under the control of the management system, or automatically delete the failed member from the virtual concatenation group temporarily when the member fails, and automatically return to the virtual concatenation group after the failed member returns to normal.
With the popularization of broadband access technology, the proportion of OTN services in communication networks is increasing. Two problems can be caused when an OTN network is used for transmitting data services, one problem is that the bandwidth waste is caused when the OTN technology with the bandwidth of 10Gbps is used for transmitting small-bandwidth data services with the bandwidths of 1Gbps, 2.5Gbps and the like; another problem is that the fixed rate OTN traffic is not flexible enough to transmit data traffic with variable bandwidth at any time.
Disclosure of Invention
The present invention provides a bandwidth adjusting method and a storage medium based on an optical transport network link, which can solve at least one of the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bandwidth adjustment method based on optical transport network link and storage medium thereof, comprising the following steps,
the control plane configures OTUk service and enables LCAS function;
a control plane creates a VCG and binds an OTUk time slot ODUi;
the link establishment signal of LCAS is pressed into the overhead of the OTU layer;
a control plane initiates an adjustment request to an OTUk link timeslot ODUi;
the source VCG returns the member state and sends out a reordering confirmation signal;
the sink VCG adjusts the member status according to the monitoring signal.
In another aspect, the present invention also discloses a computer readable storage medium storing a computer program, which when executed by a processor causes the processor to perform the steps of the method as described above.
As can be seen from the foregoing technical solutions, in the bandwidth adjusting method and the storage medium based on an optical transport network link according to the present invention, an OTUk service is configured for an OTN link, all timeslot ODUi in the OTN link are bound to a VCG, an LCAS function is enabled in the VCG, an LCAS packet is pushed into an overhead of an OTU layer, and a negotiation packet is transmitted through the OTN link, so that a state of each ODUi is known. And then according to the increase or decrease of the OTN link time slot ODUi, the bandwidth size of the OTN link is regulated to make the maximum utilization of the whole link resource.
Drawings
Fig. 1 is a frame structure of OTUk;
FIG. 2 is an overhead structure of an OTUk;
FIG. 3 is a message format of LCAS;
FIG. 4 is a schematic diagram of the method steps of the present invention;
fig. 5 is a flow chart of a bandwidth adjustment mechanism based on an optical transport network link according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 4, an embodiment of the present invention provides a bandwidth adjustment mechanism based on an optical transport network link, including the following steps:
s100, configuring OTUk service and enabling LCAS function by a control plane;
and configuring the OTN service through the control plane according to the requirement, and enabling the LCAS function globally.
S200, a control plane creates a VCG and binds an OTUk time slot ODUi;
and the control plane creates a VCG group and binds the ODUi time slot used in the OTN service into the VCG group as a member.
S300, pushing a link establishment signal of the LCAS into the overhead of the OTU layer;
the RES overhead in the OTU layer is reserved bytes as shown in figure 2, and a link establishment signal of LCAS as shown in figure 3 is pressed into the RES overhead of the OTU layer, so that equipment at two ends can transmit a negotiation signal of LCAS through an OTN link and know the negotiation state of member ODUi time slots by checking a VCG group;
s400, a control plane initiates an adjustment request to an OTUk link timeslot ODUi;
when the configured bandwidth of the OTN service cannot meet the actual demand or the bandwidth utilization rate is small, the control plane makes an increase or decrease request on the OTUk timeslot ODUi.
S500, the source VCG returns the member state and sends out a reordering confirmation signal;
when the equipment receives the adjustment request, the member serial numbers are reordered due to the change of the member number, the receiving end member detects the member change and informs the VCG module, and the VCG reorders the states of all the members according to the reordered serial numbers.
S600, the host VCG adjusts the member state according to the monitoring signal;
the host informs the VCG module of the change of the member serial number through the change of the member serial number transmitted from the opposite terminal, and the VCG changes the member state through the change of the serial number. When the status negotiation of the VCGs at the two ends is successful, the bandwidth adjustment function of the OTN link can be realized.
The following is described in detail with reference to fig. 5:
control plane configuration OTUk service
Checking whether the LCAS function is enabled on the equipment;
if the LCAS function is not started, the time slot ODUi adjustment function of the OTUk is not supported, and RES overhead in an OTUk message is also ignored in the OTN link;
if LCAS is started, the time slot ODUi adjustment function of the OTUk is supported, and the state of each member time slot ODUi in the VCG group is known through RES overhead in an OTUk message transmitted by an OTN link; the control plane sends a reordering confirmation signal through a request for adding or deleting the time slot ODUi, and updates the member state through the reordering sequence number; the host VCG adjusts the member state according to the monitoring signal, thereby realizing the bandwidth adjusting function of the optical transport network link.
To sum up, the embodiment of the present invention configures an OTUk service for an OTN link, binds all timeslot ODUi in the OTN link with a VCG, enables an LCAS function in the VCG, pushes an LCAS packet into an OTU layer overhead, and transmits a negotiation packet through the OTN link to know the state of each ODUi. And then according to the increase or decrease of the OTN link time slot ODUi, the bandwidth size of the OTN link is regulated to make the maximum utilization of the whole link resource.
In yet another aspect, the present invention also discloses a computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of any of the methods described above.
In yet another aspect, the present invention also discloses a computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of any of the methods described above.
In a further embodiment provided by the present application, there is also provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the steps of any of the methods of the above embodiments.
It can be understood that the system provided by the embodiment of the present invention corresponds to the method provided by the embodiment of the present invention, and for the explanation, examples and beneficial effects of the relevant contents, reference may be made to the corresponding parts in the above method.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a non-volatile computer readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A bandwidth adjusting method based on an optical transport network link is characterized by comprising the following steps,
the control plane configures OTUk service and enables LCAS function;
a control plane creates a VCG and binds OTUk time slots ODUi;
the link establishment signal of LCAS is pressed into the overhead of the OTU layer;
a control plane initiates an adjustment request to an OTUk link timeslot ODUi;
the source VCG returns the member state and sends out a reordering confirmation signal;
the sink VCG adjusts the member status according to the monitoring signal.
2. The method of claim 1, wherein the method comprises: the control plane creates a VCG and binds an OTUk timeslot ODUi, which specifically includes:
the control plane creates a VCG group, and binds an ODUi timeslot used in the OTN service as a member to the VCG group.
3. The method of claim 1, wherein the method comprises: the link establishment signal of LCAS is pushed into the OTU layer overhead, specifically including,
the RES overhead in the OTU layer is reserved bytes, and the link establishment signal of the LCAS is pressed into the RES overhead of the OTU layer, so that the equipment at two ends transmits the negotiation signal of the LCAS through the OTN link, and the negotiation state of the member ODUi time slot is known by checking the VCG group.
4. The method of claim 1, wherein the method comprises: the initiating of the adjustment request to the OTUk link timeslot ODUi by the control plane specifically includes,
when the configured bandwidth of the OTN service cannot meet the actual demand or the bandwidth utilization rate is small, the control plane makes an increase or decrease request on the OTUk timeslot ODUi.
5. The method of claim 1, wherein the method comprises: the source VCG returns the member status and issues a reorder acknowledgement signal, including,
when the equipment receives the adjustment request, the member serial numbers are reordered due to the change of the number of the members, the receiving end members detect the change of the members and inform the VCG module, and the VCG readjusts the states of all the members according to the reordered serial numbers.
6. The method of claim 1, wherein the method comprises: the host VCG adjusts the member status according to the monitoring signal, and specifically includes:
the host informs the VCG module of the change of the member serial number through the change of the member serial number transmitted from the opposite terminal, and the VCG changes the member state through the change of the serial number; and when the status negotiation of the VCGs at the two ends is successful, the bandwidth adjusting function of the OTN link is realized.
7. A computer-readable storage medium, storing a computer program which, when executed by a processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 6.
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Citations (5)
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| CN1791057A (en) * | 2004-12-15 | 2006-06-21 | 华为技术有限公司 | Method for transmitting data service in OTN and its device |
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| US8180224B2 (en) * | 2007-02-09 | 2012-05-15 | Huawei Technologies Co., Ltd. | Method, apparatus and system for transmitting Ethernet signals in optical transport network |
| CN103891222A (en) * | 2011-10-20 | 2014-06-25 | 瑞典爱立信有限公司 | Resizing existing traffic flow in optical transport network |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1791057A (en) * | 2004-12-15 | 2006-06-21 | 华为技术有限公司 | Method for transmitting data service in OTN and its device |
| US7616558B2 (en) * | 2004-12-23 | 2009-11-10 | Tellabs Operations, Inc. | Reduction of the transport capacity of a virtual concatenation group |
| CN1852215A (en) * | 2005-12-31 | 2006-10-25 | 华为技术有限公司 | Method and apparatus for realizing transmission of local-network signal in optical transmission network |
| US7944928B2 (en) * | 2005-12-31 | 2011-05-17 | Huawei Technologies Co., Ltd. | Method and apparatus for transporting local area network signals in optical transport network |
| US8180224B2 (en) * | 2007-02-09 | 2012-05-15 | Huawei Technologies Co., Ltd. | Method, apparatus and system for transmitting Ethernet signals in optical transport network |
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