CN115766462A - Bandwidth adjusting method based on optical transport network link and storage medium - Google Patents

Abstract

A bandwidth adjustment method and storage medium based on optical transport network links of the present invention, comprising the following steps, the control plane configures OTUk services and enables LCAS functions; the control plane creates VCG and binds OTUk time slot ODUi; LCAS link building The signal is pushed into the OTU layer overhead; the control plane initiates an adjustment request to the OTUk link time slot ODUi; the source VCG returns the member status and sends a reordering confirmation signal; the sink VCG adjusts the member status according to the monitoring signal. The bandwidth adjustment method and storage medium based on optical transport network links of the present invention configure OTUk services for OTN links, and bind all time slot ODUi in OTN links with VCG, and enable LCAS function in VCG, The LCAS message is pushed into the OTU layer overhead, and the negotiation message is transmitted through the OTN link to know the status of each ODUi. Then, according to increasing or decreasing the time slot ODUi of the OTN link, the bandwidth of the OTN link is adjusted to maximize the utilization of the entire link resource.

Description

Bandwidth adjustment method and storage medium based on optical transport network link

technical field

The invention relates to the technical field of network communication, in particular to a method for adjusting bandwidth based on links of an optical transport network and a storage medium.

Background technique

Optical Transport Network (OTN) technology is the product of the integration of electrical network and all-optical network. It transplants the powerful and perfect OAM concept and function of SDH to WDM optical network, effectively making up for the existing WDM system in terms of performance monitoring and maintenance management. insufficient. OTN technology can support transparent transmission of customer signals, high-bandwidth multiplexing switching and configuration, has strong overhead support capabilities, provides powerful OAM functions, supports multi-layer nested serial connection monitoring (TCM) functions, and has forward correction Error (FEC) support capability.

OTN is a standard frame format formulated by the International Standards Organization ITU for the Optical Transport Network. OTN is composed of multi-layer frame formats, and the relationship between layers is nested, and the bottom layer is completely contained in the high layer. The OTU is divided into OTUk (k=1,2,3) according to the rate level. OTUk has exactly the same frame structure as shown in Figure 1. The length of the OTUk frame is fixed, in bytes, with a total of 4 rows and 4080 columns, and a total of 4*4080=16320 bytes. The OTUk frame also includes two layers of frame structure, which are ODU and OPU respectively. The inclusion relationship between them is OTU>ODU>OPU. OPU is completely contained in the ODU layer, and ODU is completely contained in the OTU layer. An OTUk frame consists of three parts: OTUk overhead, ODUk frame and OTUk FEC. The ODUk frame is composed of ODUk overhead and OPUk frame, and the OPUk frame is composed of OPUk payload and OPUk overhead, thus forming a three-layer frame structure of OTUk-ODUk-OPUk. The multiplexing relationship is: when multiple low-speed ODUi are aggregated into one high-speed ODUk, the low-speed ODUi is completely loaded into the payload part of the high-speed ODUk, and the overheads of the low-speed ODUi and high-speed ODUk are independent.

LCAS is introduced by ITU-T to solve the problem of dynamic bandwidth allocation. It uses VC cascading technology to solve the problem of inconvenient use of fixed bandwidth by bundling multiple VCs for simultaneous use. This mechanism can increase or decrease the bandwidth without damage through the controller under the control of the management system, or when a member fails, it will automatically delete the failed member from the virtual concatenation group temporarily, and automatically return to the virtual cascading group after the failed member returns to normal. In the virtual concatenation group.

With the popularization of broadband access technology, the proportion of OTN services in the communication network is increasing. Using the OTN network to transmit data services will cause two problems. One problem is that using the OTN technology with a bandwidth of 10 Gbps to transmit small-bandwidth data services such as 1 Gbps and 2.5 Gbps will inevitably cause waste of bandwidth; Data services that change at any time, OTN services with a fixed rate are not flexible enough.

Contents of the invention

A bandwidth adjustment method and storage medium based on optical transport network links proposed by the present invention can solve at least one of the above technical problems.

To achieve the above object, the present invention adopts the following technical solutions:

A bandwidth adjustment method and storage medium based on an optical transport network link, comprising the following steps,

Configure the OTUk service on the control plane and enable the LCAS function;

The control plane creates VCG and binds OTUk time slot ODUi;

The link establishment signal of LCAS is pushed into the OTU layer overhead;

The control plane initiates an adjustment request to the OTUk link time slot ODUi;

The source VCG returns the member status and sends a reordering confirmation signal;

The sink VCG adjusts the status of the members according to the monitoring signal.

On the other hand, the present invention also discloses a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the above-mentioned method.

It can be seen from the above-mentioned technical solution that the bandwidth adjustment method and storage medium based on the optical transport network link of the present invention configure the OTUk service for the OTN link, and bind all the time slot ODUi in the OTN link with the VCG. The LCAS function is enabled in the middle, and the LCAS message is pushed into the OTU layer overhead, and the negotiation message is transmitted through the OTN link to know the status of each ODUi. Then, according to increasing or decreasing the time slot ODUi of the OTN link, the bandwidth of the OTN link is adjusted to maximize the utilization of the entire link resource.

Description of drawings

Fig. 1 is the frame structure of OTUk;

Fig. 2 is the overhead structure of OTUk;

Figure 3 is the message format of LCAS;

Fig. 4 is a schematic diagram of method steps of the present invention;

FIG. 5 is a flowchart of a bandwidth adjustment mechanism based on optical transport network links in the present invention.

Detailed ways

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

As shown in Figure 4, the embodiment of the present invention provides a bandwidth adjustment mechanism based on optical transport network links, including the following steps:

S100, the control plane configures the OTUk service and enables the LCAS function;

According to requirements, configure OTN services on the control plane and enable the LCAS function globally.

S200, the control plane creates a VCG and binds the OTUk time slot ODUi;

The control plane creates a VCG group, and binds the ODUi time slots used in the OTN service as members into the VCG group.

The link establishment signal of S300 and LCAS is pushed into the OTU layer overhead;

The RES overhead in the OTU layer is a reserved byte, as shown in Figure 2. The LCAS link establishment signal is pushed into the RES overhead of the OTU layer as shown in Figure 3, so that the devices at both ends can transmit the LCAS negotiation signal through the OTN link. By viewing the VCG group, understand the member ODUi time slot negotiation status;

S400. The control plane initiates an adjustment request to the OTUk link time slot ODUi;

When the bandwidth of the configured OTN service cannot meet the actual demand or the bandwidth utilization rate is very small, the controller requests to increase or decrease the ODUi of the OTUk time slot.

S500. The source VCG returns the member state and sends a reordering confirmation signal;

When the device receives the adjustment request, the member serial numbers are reordered due to the change in the number of members. The receiving member detects the member change and notifies the VCG module, and the VCG readjusts the status of each member according to the reordered serial number.

S600. The sink VCG adjusts the member status according to the monitoring signal;

The sink notifies 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 status of the member through the change of the serial number. After the VCG status negotiation at both ends is successful, the bandwidth adjustment function of the OTN link can be implemented.

The following is a specific description in conjunction with Figure 5:

Configuring OTUk Services on the Control Plane

Check whether the LCAS function is enabled on the device;

If the LCAS function is not enabled, the time slot ODUi adjustment function of OTUk is not supported, and the RES overhead in the OTUk message is also ignored in the OTN link;

If LCAS is enabled, it supports the OTUk time slot ODUi adjustment function, through the RES overhead in the OTUk message transmitted by the OTN link, to know the time slot ODUi status of each member in the VCG group; the control plane adds or deletes the time slot ODUi request, the source VCG sends a reordering confirmation signal, and updates the member status through the reordering number; the sink VCG adjusts the member status according to the monitoring signal, thereby realizing the bandwidth adjustment function of the optical transport network link.

To sum up, the embodiment of the present invention configures OTUk services for OTN links, and binds ODUi of all time slots in the OTN link to VCG, enables the LCAS function in VCG, and pushes LCAS messages into the OTU layer overhead In the process, the negotiation message is transmitted through the OTN link, and the status of each ODUi is known. Then, according to increasing or decreasing the time slot ODUi of the OTN link, the bandwidth of the OTN link is adjusted to maximize the utilization of the entire link resource.

In another aspect, the present invention also discloses a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the processor is made to perform the steps of any one of the above methods.

In another aspect, the present invention also discloses a computer device, including a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the processor executes any one of the above methods A step of.

In yet another embodiment provided by the present application, a computer program product including instructions is also provided, which, when run on a computer, causes the computer to execute the steps of any one of the methods in the above embodiments.

It can be understood that the system provided in the embodiment of the present invention corresponds to the method provided in the embodiment of the present invention, and the explanations, examples and beneficial effects of related content can refer to corresponding parts in the above method.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be realized through computer programs to instruct related hardware, and the programs can be stored in a non-volatile computer-readable storage medium When the program is executed, it may include the processes of the embodiments of the above-mentioned methods. Wherein, any references to memory, storage, database or other media used in the various embodiments provided in the present application may include non-volatile and/or volatile memory. Nonvolatile 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 many forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Chain Synchlink DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the 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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