CN114339482A

CN114339482A - Path switching method, device and system, electronic equipment and storage medium

Info

Publication number: CN114339482A
Application number: CN202011087629.6A
Authority: CN
Inventors: 张源斌; 王东; 童玲玲
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2022-04-12

Abstract

The application provides a path switching method, a device and a system, an electronic device and a computer readable storage medium, wherein the path switching method applied to a source node comprises the following steps: the source node stops sending the first customer service through the first path; a source node sends a path switching indication frame through a first path; the path switching indication frame is used for informing the host node of path switching; and after a specific time, the source node switches the first client service from the first path to the second path for sending.

Description

Path switching method, device and system, electronic equipment and storage medium

Technical Field

The embodiments of the present application relate to the field of optical communications, and in particular, to a method, an apparatus, and a system for path switching, an electronic device, and a computer-readable storage medium.

Background

In the definition of an Optical Transport Network (OTN), a method for carrying a plurality of service signals in a payload of an OTN signal is to divide the payload of the OTN signal into n timeslots, then carry the service signals in one or more timeslots in the payload of the OTN signal, and implement the timeslots in a byte-interleaved manner.

According to the OTN standard g.709, the minimum timeslot granularity of the OTN technology is 1.25G, and when the timeslot granularity carries traffic lower than 1.25G, such as Fast Ethernet (FE) traffic, Synchronous Transport Module (STM) 1 traffic, E1 traffic, the bandwidth waste is very serious. For example, the bandwidth of E1 traffic is 2 megabits (M), and in a 1.25G timeslot, bandwidth is wasted by up to 99%. Therefore, a transmission technology is needed to realize a method for efficiently carrying small-particle traffic in an OTN. One research hotspot in the industry is to use an Optical Service Unit (OSU) to carry small-granule services, and use a Payload Block (PB) to partition a Payload area of an OTN frame, where the OSU is mapped into the PB. Before an OSU is transmitted to an Optical port, the OSU needs to be carried in an Optical Data Unit (ODU), and the rate of the OSU is mainly below 1G, and at most 1000 OSUs can be carried in one ODU, so that only scattered bandwidth resources are left in the ODU in the actual deployment process, and when an OSU needs to be added to the ODU having only the scattered bandwidth resources or the bandwidth occupied by the OSU is adjusted, the remaining bandwidth resources in the ODU are not enough to meet the bandwidth requirement or the bandwidth adjustment amount requirement of the added OSU, and then the OSU needs to be subjected to path switching.

The current path switching method needs to stop the transmission of the service first, and then continue the transmission of the service after the path switching is completed, and the transmission of the service cannot be performed in the process of the path switching.

Disclosure of Invention

The embodiment of the application provides a path switching method, a path switching device, a path switching system, an electronic device and a computer-readable storage medium.

In a first aspect, an embodiment of the present application provides a path switching method, where the method includes:

the source node stops sending the first customer service through the first path;

a source node sends a path switching indication frame through a first path; the path switching indication frame is used for informing the host node of path switching;

and after a specific time, the source node switches the first client service from the first path to the second path for sending.

In a second aspect, an embodiment of the present application provides an electronic device, including:

at least one processor;

a memory having at least one program stored thereon, the at least one program, when executed by the at least one processor, implementing any of the path switching methods described above.

In a third aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements any one of the path switching methods described above.

In a fourth aspect, an embodiment of the present application provides a path switching system, including:

a source node to:

stopping sending the first customer traffic over the first path;

transmitting a path switching indication frame through a first path; the path switching indication frame is used for informing the host node of path switching;

after a specific time, switching the first client service from the first path to the second path for sending;

and the sink node is used for detecting the path switching indication frame in the first path and switching the first path to the second path to receive the first customer service.

The path switching method applied to the source node provided by the embodiment of the application stops sending the first client service through the first path, sends the path switching indication frame through the first path to inform the sink node of path switching, and switches the first client service from the first path to the second path to send after a specific time, that is, informs the sink node of path switching through the path switching indication frame, so that the path switching is realized while the first client service is transmitted, the first client service does not need to be continuously transmitted after the source node and the sink node simultaneously perform path switching, and the path switching is realized without influencing the transmission of the client service.

In the path switching method applied to the sink node provided in the embodiment of the present application, since the path switching indication frame is sent by the source node through the first path after the source node stops sending the first client service through the first path, when the sink node detects the path switching indication frame in the first path, it indicates that the first client service has been switched to the second path for transmission, and at this time, the sink node switches to the second path to receive the first client service, thereby implementing path switching without affecting client service transmission.

In the path switching method provided in the embodiment of the present application, a source node first stops sending a first client service through a first path, and then sends a path switching indication frame through the first path to notify a sink node of performing path switching, and after a specific time, the first client service is switched from the first path to a second path for sending, that is, the source node is notified of performing path switching through the path switching indication frame; when the host node detects the path switching indication frame in the first path, the host node indicates that the first customer service is switched to the second path for transmission, and at this time, the host node switches from the first path to the second path to receive the first customer service, so that the path switching is realized while the first customer service is transmitted, the first customer service does not need to be transmitted continuously after the source node and the host node simultaneously perform the path switching, and the path switching is realized without influencing the customer service transmission.

Drawings

Fig. 1 is a schematic diagram of client service transmission between two client devices in an embodiment of the present application;

fig. 2 is a flowchart of a path switching method applied to a source node according to an embodiment of the present application;

FIG. 3 is a diagram of a path switch indication frame according to an embodiment of the present application;

FIG. 4 is a diagram illustrating a keep-alive frame in an embodiment of the present application;

fig. 5 is a flowchart of a path switching method applied to a sink node according to another embodiment of the present application;

fig. 6 is a flowchart of a path switching method applied to a network management server according to another embodiment of the present application;

fig. 7 is a flowchart of a path switching method according to another embodiment of the present application;

fig. 8 is an interaction diagram of a path switching method provided in example 1 of the embodiment of the present application;

fig. 9 is an interaction diagram of a path switching method provided in example 2 of the embodiment of the present application;

fig. 10 is a block diagram of a source node according to another embodiment of the present application;

fig. 11 is a block diagram of a sink node according to another embodiment of the present application;

fig. 12 is a block diagram of a network management server according to another embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present application, the following describes in detail a path switching method, an apparatus and a system, an electronic device, and a computer-readable storage medium provided in the present application with reference to the drawings.

Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but which may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The embodiments and features of the embodiments of the present application may be combined with each other without conflict.

As used herein, the term "and/or" includes any and all combinations of at least one of the associated listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of at least one other feature, integer, step, operation, element, component, and/or group thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present application and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

In the embodiment of the present application, as shown in fig. 1, when a client device 1 and a client device 2 need to transmit a client service, a starting point of a path to be traveled is a source node, an end point of the path is a sink node, and the path passes through at least one intermediate node. Due to the bi-directionality of the path transmission, the customer service data packets (PKT, PacKeT) may be transmitted from the source node to the sink node, and may also be transmitted from the sink node to the source node.

The path in the embodiment of the present application refers to a path between a source node and a sink node.

The following describes the process of transporting customer service packets from a source node to a sink node.

When a client service needs to be sent by a source node, mapping the client service into an OSU through a client side single board 1 in the source node, transmitting the OSU to a line side single board 1 through a cross board 1 in the source node, mapping the OSU into an ODUk through the line side single board 1 in the source node, and sending the ODUk to a downstream node (i.e., an intermediate node adjacent to the source node and close to one side of a host node on a path); where k represents the rate level of the client traffic and may be an integer greater than or equal to 1 or flex.

Receiving the ODUk by the intermediate node, acquiring the OSU from the ODUk through the line-side board 2 of the intermediate node, transmitting the OSU to the line-side board 3 through the cross board 2 of the intermediate node, remapping the OSU into the ODUk through the line-side board 3 of the intermediate node, and transmitting the ODUk to a downstream node (i.e., an intermediate node adjacent to the intermediate node on the path and near to the sink node side; or a sink node);

the sink node receives the ODUk, acquires the OSU from the ODUk through the line-side board 4 of the sink node, transmits the OSU to the client-side board 2 through the cross board 3 of the sink node, and acquires the client service data packet from the OSU through the client-side board 2 of the sink node.

The following describes the process of transporting customer service data packets from a sink node to a source node.

When a client service needs to be sent, a client side single board 2 in a host node maps the client service into an OSU, the OSU is transmitted to a line side single board 4 through a cross board 3 of the host node, the OSU is mapped into an ODUk through the line side single board 4 in the host node, and the ODUk is sent to an upstream node (namely, an intermediate node which is adjacent to the host node on a path and is close to one side of a source node);

receiving the ODUk by the intermediate node, acquiring the OSU from the ODUk through a line-side board 3 of the intermediate node, transmitting the OSU to a line-side board 2 through a cross board 2 of the intermediate node, remapping the OSU into the ODUk through the line-side board 2 of the intermediate node, and transmitting the ODUk to an upstream node (i.e., an intermediate node adjacent to the intermediate node on the path and near to the sink source node side;

the source node receives the ODUk, acquires the OSU from the ODUk through the line-side board 1 of the source node, transmits the OSU to the client-side board 1 through the source cross board 1, and acquires the client service data packet from the OSU through the client-side board 1 of the source node.

Fig. 2 is a flowchart of a path switching method applied to a source node according to an embodiment of the present application.

In a first aspect, referring to fig. 2, an embodiment of the present application provides a path switching method, where the method includes:

step 200, the source node stops sending the first customer traffic through the first path.

In this embodiment, the first client service is a client service that needs to be switched to a path.

In some example embodiments, the source node may stop sending the first customer traffic over the first path when a path switch is required.

Step 201, a source node sends a path switching indication frame through a first path; the path switching indication frame is used for informing the sink node of path switching.

In some example embodiments, the source node may send the path switch indication frame over the first path after sending the last first customer traffic over the first path, that is, the path switch indication frame is sent immediately after the first customer traffic.

In some exemplary embodiments, as shown in fig. 3, the path switch indication frame is a special OSU Operation Administration and Maintenance (OAM) frame, the path switch indication frame only conveys OSU overhead, an OSU payload is padding, an OT field of the OSU overhead includes an OSU OAM frame type, and the OSUOAM frame type is used to indicate that the OSU OAM frame is the path switch indication frame.

In some example embodiments, the source node may implement the sending of the path switch indication frame over the first path in any one of the following manners.

First, the source node sends a path switch indication frame through the first path at a second rate.

Second, the source node sends a fixed number of path switch indication frames over the first path, and sends a second keep-alive frame over the first path at a third rate.

It should be noted that the first keep-alive frame and the second keep-alive frame may be the same or different.

Step 202, after a specific time, the source node switches the first client service from the first path to the second path for sending.

In some exemplary embodiments, the second path is a path that has been created before the source node stopped sending the first customer traffic over the first path. For example, the second path may be a path created by the network management server before the source node stops sending the first client traffic over the first path.

In some example embodiments, the source node may switch the first customer traffic from the first path to the second path for delivery after a specified time after stopping sending the first customer traffic over the first path.

In some exemplary embodiments, the source node and the sink node of the first path and the second path are the same, and the first path and the second path may be the same path or different paths. For example, the first path and the second path are carried in different ODUk, or carried in different carriers, or carried in different optical fibers.

It should be noted that, the first path and the second path carried in different ODUk may refer to paths with different numbers and the same value of k, or may refer to ODUk with different values of k.

In some exemplary embodiments, the bandwidth of the first path and the second path may be the same or different. For example, in the case of a newly added client service, if the remaining bandwidth of the ODUk cannot meet the bandwidth requirement of the newly added client service, it may be considered to perform path switching on the existing client service in the ODUk to increase the remaining bandwidth of the ODUk, so that the remaining bandwidth of the ODUk can meet the bandwidth requirement of the newly added client service, and then the bandwidths of the first path and the second path are the same when performing the path switching. For another example, in a case that a bandwidth of a client service needs to be adjusted, if a remaining bandwidth of the ODUk cannot satisfy the bandwidth adjustment amount, the path of the client service needs to be switched, so that the remaining bandwidth of the switched ODUk can satisfy the bandwidth adjustment amount, and in this case, bandwidths of the first path and the second path are different.

In some exemplary embodiments, before the source node stops sending the first customer traffic over the first path, the method further comprises: a source node receives a first command sent by a network management server; the first command is used for indicating the path switching of the first client service. For example, after the network management server creates the second path, the network management server sends a first command to the source node; or before the network management server creates the second path, the network management server sends the first command to the source node.

In some exemplary embodiments, before the source node stops sending the first customer traffic over the first path, the method further comprises: the source node sends a first keep-alive frame over a second path at a first rate.

It should be noted that, after the second path is created, in order to improve the success rate of subsequent path switching, the source node may first detect whether the second path is capable of transmitting the client service, that is, send the first keep-alive frame in the second path. If the sink node can normally receive and recognize the first keep-alive frame, it indicates that the second path can normally transmit the customer service.

It should be noted that the source node may also be configured to detect whether the second path is capable of transmitting the client service without detecting whether the second path is capable of transmitting the client service, and the default second path is capable of transmitting the client service, or detect whether the second path is capable of transmitting the client service by using another method.

In some exemplary embodiments, the first rate may be set at will.

In some exemplary embodiments, as shown in fig. 4, the keep-alive frame is a special OSU frame, the keep-alive frame only conveys OSU overhead, the OSU payload is padding, and the FT field of the OSU overhead includes an OSU frame type for indicating that the OSU frame is a keep-alive frame.

In some exemplary embodiments, before the source node stops sending the first customer traffic over the first path, the method further comprises:

respectively carrying out time delay measurement on the first path and the second path by the source node to obtain the time delay of the first path and the time delay of the second path; the source node determines a specific time according to the delay of the first path and the delay of the second path.

In some exemplary embodiments, the source node may carry information required for performing the delay measurement in the overhead of the first keep-alive frame, so as to implement the delay measurement on the second path, and similarly, the source node may carry information required for performing the delay measurement in the overhead of the client traffic transmitted through the first path, so as to implement the delay measurement on the first path.

It should be noted that the source node may perform delay measurement on the first path and the second path respectively before receiving the first command sent by the network management server, or may perform delay measurement on the first path and the second path respectively after receiving the first command sent by the network management server.

In some exemplary embodiments, the determining, by the source node, the specific time according to the delay of the first path and the delay of the second path includes at least one of:

if the time delay of the first path is greater than the time delay of the second path, the source node determines that the specific time is t + delta;

if the time delay of the first path is smaller than the time delay of the second path and delta is larger than or equal to the absolute value of t, the source node determines that the specific time is delta;

if the time delay of the first path is smaller than the time delay of the second path and delta is smaller than the absolute value of t, the source node determines that the specific time is 0;

wherein t is a difference between the delay of the first path and the one-way delay of the second path, and Δ includes at least one of: an error compensation value for the delay measurement and the time required to identify the path switch indication frame.

It should be noted that if Δ includes the error compensation value of the delay measurement and the time required for identifying the path switch indication frame, Δ is greater than or equal to the sum of the error compensation value of the delay measurement and the time required for identifying the path switch indication frame.

In some exemplary embodiments, after the source node switches the first customer service from the first path to the second path for transmission, the method further includes:

the source node receives a second command sent by the network management server and deletes the first path; wherein the second command is used for indicating to delete the first path.

In some exemplary embodiments, the method further comprises:

the host node detects a path switching indication frame in the first path, and switches the first path to the second path to receive a first client service; the path switching indication frame is used for informing the sink node of path switching.

In some exemplary embodiments, the first path is deleted after receiving the first customer traffic by switching from the first path to the second path.

For example, the network management server may send the second command to each node on the first path; the second command is used for indicating to delete the first path;

and the source node receives a second command sent by the network management server and deletes the first path.

And the destination node receives a second command sent by the network management server and deletes the first path.

The path switching method applied to the source node provided by the embodiment of the application stops sending the first client service through the first path, and then sends the path switching indication frame through the first path to inform the sink node of path switching, and the first client service is switched from the first path to the second path to be sent after a specific time, that is, the path switching indication frame is used for informing the sink node of path switching, so that the path switching is realized while the first client service is transmitted, the first client service does not need to be continuously transmitted after the source node and the sink node simultaneously perform path switching, and the path switching is realized without influencing the transmission of the client service.

Fig. 5 is a flowchart of a path switching method applied to a sink node according to another embodiment of the present application.

In a second aspect, referring to fig. 5, another embodiment of the present application provides a path switching method, including:

step 500, the host node detects a path switching indication frame in the first path, and switches from the first path to the second path to receive a first client service; the path switching indication frame is used for informing the sink node of path switching.

In some example embodiments, the sink node detecting the path switch indication frame at the first path comprises:

the host node detects a path switching indication frame in the continuous N frames of the first path; wherein N is an integer greater than or equal to 1.

In some exemplary embodiments, after receiving the first customer traffic by switching from the first path to the second path, the method further comprises:

the host node receives a second command sent by the network management server and deletes the first path; wherein the second command is used for indicating to delete the first path.

In the path switching method applied to the sink node provided in the embodiment of the present application, because the path switching indication frame is sent through the first path after the source node stops sending the first client service through the first path, when the sink node detects the path switching indication frame through the first path, it indicates that the first client service has been switched to the second path for transmission, and at this time, the sink node switches to the second path to receive the first client service, thereby implementing path switching without affecting client service transmission.

Fig. 6 is a flowchart of a path switching method at a network management server side according to another embodiment of the present application.

In a third aspect, referring to fig. 6, another embodiment of the present application provides a path switching method, including:

step 600, the network management server creates a second path for the first client service and sends a first command to the source node; the first command is used for indicating the path switching of the first client service.

In some exemplary embodiments, in the process of creating the second path for the first client service, the network management server may notify each node of the second path by interacting with each node on the second path.

In some exemplary embodiments, after sending the first command to the source node, the method further comprises:

the network management server sends a second command to each node on the first path; wherein the second command is used for indicating to delete the first path.

In some exemplary embodiments, the second command may be sent to each node after a preset time for the network management server to send the first command to the source node.

In some exemplary embodiments, the preset time is a time required for completing the path switching after the source node receives the first command. The preset time may be determined according to an empirical value of path switching.

In some exemplary embodiments, before the network management server creates the second path for the first client service, the method further includes:

the network management server determines the first customer service as the customer service needing path switching according to the bandwidth occupied by the second customer service; wherein, the second customer service is a newly added customer service;

or, the network management server determines the first client service as the client service needing path switching according to the target bandwidth occupied by the third client service; wherein the third client service is the client service which needs to adjust the bandwidth.

In some exemplary embodiments, if the remaining bandwidth of the ODUk is smaller than the bandwidth occupied by the second client service, it is determined that any one of the ODUk where the first client service is located is the first client service, so that the remaining bandwidth of the ODUk is larger than the bandwidth occupied by the second client service. In this case, the first path and the second path are the same bandwidth. Therefore, the residual bandwidth of the ODUk can be reduced as much as possible, and the bandwidth resource fragments of the ODUk are reduced.

In some exemplary embodiments, if the remaining bandwidth of the ODUk where the third client service is located is smaller than the difference between the target bandwidth (i.e., the bandwidth after adjustment) occupied by the third client service and the original bandwidth (i.e., the bandwidth before adjustment), it is determined that the third client service is the first client service, where in this case, the bandwidths of the first path and the second path are different, the bandwidth of the first path is the original bandwidth, and the bandwidth of the second path is the target bandwidth; or, determining any one of the client services except the third client service in the ODUk as the first client service, so that the remaining bandwidth of the ODUk is greater than the difference between the target bandwidth (i.e., the adjusted bandwidth) occupied by the third client service and the original bandwidth (i.e., the bandwidth before adjustment), where in this case, the bandwidths of the first path and the second path are the same. Therefore, the residual bandwidth of the ODUk can be reduced as much as possible, and the bandwidth resource fragments of the ODUk are reduced.

The path switching method applied to the network management server provided in the embodiment of the present application sends the first command to the source node after the second path is created for the first client service, so as to implement the path switching of the first client service, so that the transmission of the first client service is not affected by the time delay introduced by the newly created path in the path switching process.

Fig. 7 is a flowchart of a path switching method according to another embodiment of the present application.

In a fourth aspect, referring to fig. 7, another embodiment of the present application provides a path switching method, including:

step 700, the source node stops sending the first customer service through the first path; transmitting a path switching indication frame through a first path; the path switching indication frame is used for informing the host node of path switching; and after a specific time, switching the first client service from the first path to the second path for sending.

It should be noted that, after the second path is created, in order to improve the success rate of subsequent path switching, it may be first detected whether the second path is capable of transmitting the client service, that is, the first keep-alive frame is sent in the second path. If the sink node can normally receive and recognize the first keep-alive frame, it indicates that the second path can normally transmit the customer service.

In some exemplary embodiments, the first rate may be set at will.

In some exemplary embodiments, as shown in fig. 3, the path switch indication frame is a special OSU oam frame, the path switch indication frame only conveys OSU overhead, an OSU payload is a padding character, and an OSU oam frame type is included in an OT field of the OSU overhead, and the OSU oam frame type is used to indicate that the OSU oam frame is the path switch indication frame.

Step 701, the sink node detects a path switching indication frame in the first path, and switches from the first path to the second path to receive the first client service.

In some exemplary embodiments, before the source node receives the first command sent by the network management server, the method further includes: the source node sends a first keep-alive frame over a second path at a first rate.

In some exemplary embodiments, after receiving the first customer traffic by switching from the first path to the second path, the method further comprises: the first path is deleted.

after the source node switches the first customer service from the first path to the second path for transmission, the method further includes:

the source node receives a second command sent by the network management server and deletes the first path;

after the sink node switches from the first path to the second path to receive the first customer service, the method further includes:

respectively carrying out time delay measurement on the first path and the second path by the source node to obtain the time delay of the first path and the time delay of the second path; the specific time is determined based on the time delay of the first path and the time delay of the second path.

In some exemplary embodiments, the information required for performing the delay measurement may be carried in the overhead of the first keep-alive frame, so as to implement the delay measurement on the second path, and similarly, the information required for performing the delay measurement may be carried in the overhead of the client traffic transmitted through the first path, so as to implement the delay measurement on the first path.

It should be noted that, the time delay measurement may be performed on the first path and the second path respectively before receiving the first command sent by the network management server, or the time delay measurement may be performed on the first path and the second path respectively after receiving the first command sent by the network management server.

In the path switching method provided in the embodiment of the present application, a source node first stops sending a first client service through a first path, and then sends a path switching indication frame through the first path to notify a sink node of performing path switching, and after a specific time, the first client service is switched from the first path to a second path for transmission, that is, the source node is notified of performing path switching through the path switching indication frame; when the host node detects the path switching indication frame in the first path, the host node indicates that the first client service is switched to the second path for transmission, and at this time, the host node switches from the first path to the second path to receive the first client service, so that the path switching is realized while the first client service is transmitted, the first client service does not need to be continuously transmitted after the source node and the host node simultaneously perform the path switching, and the path switching is realized without influencing the client service transmission.

The path switching method of the embodiment of the present application is described in detail below by two examples, which are only for convenience of description and are not used to limit the scope of the embodiment of the present application.

Example 1

This example describes an end-to-end transmission scenario as shown in fig. 1, assuming that a payload size of one ODU0 is 1.25Gbps, there are 11 OSUs carrying 100M PKT service and 2 OSUs carrying 50M PKT service in ODU0#1, and there are 12 OSUs carrying 100M PKT service in ODU0#2, at this time, there are bandwidth resources available for 50M in each of two ODUs 0, at this time, it is desired to add one OSU of 100M, any one ODU0 cannot carry, it is necessary to switch one 50M PKT service in ODU0#1 to ODU0#2, so that bandwidth resource fragments of two ODUs 0 are effectively sorted, as shown in fig. 8, a specific implementation manner is:

step 1, the network manager issues a path switching command (i.e. the first command) to the source node.

Step 2, the network management server creates an end-to-end OSU path (i.e. the second path) for the PKT service of 50M carried by the ODU0#1 in the ODU0#2, where the bandwidth level of the OSU path is also 50M, and since the overhead is to be carried, the actual bandwidth of the OSU is greater than 50M, and for convenience of description, the bandwidth level is used here for description.

And step 3, in the newly-built OSU path, sending a first keep-alive frame at a speed of 10M, wherein the format of the keep-alive frame is shown in FIG. 3, and the overhead of the OSU comprises an OSU frame type, and the OSU frame type is used for indicating that the OSU frame is a keep-alive frame.

And 4, respectively carrying out end-to-end time delay measurement on the original OSU path (namely the first path) and the newly-built OSU path by the source node, wherein the one-way time delay of the original OSU path is 235 mu s, the one-way time delay of the newly-built OSU path is 230 mu s, and calculating the time delay difference t between the original OSU path and the newly-built OSU path to be t1-t2 to be 5 mu s.

Step 5, the source node stops sending the client service through the original OSU path, sends a 3-frame path switching indication frame, the path switching indication frame is a special OSU OAM frame, as shown in fig. 4, the OSU frame type is used to indicate that the OSU frame is an OSU OAM frame, and the OSU OAM frame type is used to indicate that the OSU OAM frame is a path switching indication frame, which is used to inform the sink node to perform OSU path switching, a second keep-alive frame is sent at the rate of 10M behind the path switching indication frame, after (5+2) μ s, the client service is switched to a new OSU path, where 2 μ s is an offset, which aims to make up the delay measurement error and identify the time required by the path switching indication frame, and to ensure the lossless switching process.

And 6, after the original OSU path receives each OSU frame, the host node firstly conducts Cyclic Redundancy Check (CRC) check, after the CRC check is correct, OSU frame type detection is conducted, and if the OSU frames detected by two continuous frames are path switching indication frames, the OSU paths are switched to the newly-built OSU paths to receive the customer service.

And 7, the network management server sends a deletion command (namely the second command) to each node on the original OSU path after the preset time, and each node on the original OSU path deletes the original OSU path and reports the success of the switching of the customer service path to the network management.

Example 2

This example describes an end-to-end transmission scenario as shown in fig. 1, assuming that the payload size of one ODU2 is 10Gbps, there are 8 OSUs carrying 1G PKT service in the ODU2#1, and 1 OSU carrying 5G PKT service in the ODU2#2, and the bandwidth of one 1G PKT service in the ODU2#1 is expected to increase to 5G, but only 2G available bandwidth in the ODU2#1 needs to perform lossless bandwidth increase processing across ODUs, as shown in fig. 9, a specific implementation manner is:

step 1, a network manager issues a bandwidth increasing command to a source node to request that the bandwidth of a PKT service is increased from 1G to 5G, the source node sends a bandwidth increasing request command to other nodes in an in-band overhead mode after receiving the bandwidth increasing command of a network management server, and the source node receives a fault indication command and reports the insufficient bandwidth resource of a path and the adjusted bandwidth is 5G to the network manager due to the insufficient bandwidth resource on the link;

and 2, the network management server sends a path switching command (namely the first command) to the source node.

Step 3, the network management server creates an end-to-end OSU path (i.e. the second path) for the 1G PKT service carried by the ODU2#1 in the ODU2#2, where the bandwidth level of the OSU path is also 5G, and since the overhead needs to be carried, the actual bandwidth of the OSU is greater than 5G, and for convenience of description, the bandwidth level is used here for description.

And step 4, in the newly-built OSU path, sending a first keep-alive frame at a speed of 100M, wherein the format of the keep-alive frame is shown in FIG. 3, and the overhead of the OSU comprises an OSU frame type, and the OSU frame type is used for indicating that the OSU frame is a keep-alive frame.

And step 5, the source node respectively performs end-to-end time delay measurement on the original OSU path (namely, the first path) and the newly-built OSU path, and under the condition that the paths in the transmitting and receiving directions are symmetrical, bidirectional time delay measurement can be adopted, the bidirectional time delay of the original OSU path is 50 μ s, the bidirectional time delay of the newly-built OSU path is 40 μ s, the bidirectional time delay difference t between the original OSU path and the newly-built OSU path is calculated to be t1-t2 which is 10 μ s, and the unidirectional time delay difference is 10/2 which is 5 μ s.

Step 6, the source node stops sending the client service through the original OSU path, sends a 3-frame path switching indication frame, the path switching indication frame is a special OSU OAM frame, as shown in fig. 4, the OSU frame type is used to indicate that the OSU frame is an OSU OAM frame, and the OSU OAM frame type is used to indicate that the OSU OAM frame is a path switching indication frame, which is used to inform the sink node to perform the OSU path switching, a second keep-alive frame is sent at the rate of 10M behind the path switching indication frame, and after (5+2) μ s, the client service is switched to a new OSU path, where 2 μ s is an offset, which aims to make up the time delay measurement error and identify the path switching indication frame, and ensure the lossless switching process.

And 7, the host node firstly performs CRC (cyclic redundancy check) after receiving each OSU frame in the original OSU path, performs OSU frame type detection after the CRC is correct, and switches to a newly-built OSU path to receive the customer service if the OSU frame detected by two continuous frames is a path switching indication frame.

And 8, after switching from the original OSU path to the newly-built OSU path is completed, the source node increases the bandwidth of the client service from 1G to 5G, the network management server issues a deletion command (namely the second command) to each node on the original OSU path after the preset time, and each node on the original OSU path deletes the original OSU path and reports the success of switching the client service path to the network management.

In a fifth aspect, an embodiment of the present application provides an electronic device, including:

at least one processor;

Wherein, the processor is a device with data processing capability, which includes but is not limited to a Central Processing Unit (CPU) and the like; memory is a device with data storage capabilities including, but not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), FLASH memory (FLASH).

In some embodiments, the processor, memory, and in turn other components of the computing device are connected to each other by a bus.

In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements any one of the path switching methods described above.

Fig. 10 is a block diagram of a source node according to another embodiment of the present application.

In a seventh aspect, referring to fig. 10, another embodiment of the present application provides a source node, including:

a first sending module 1001 configured to:

stopping sending the first customer traffic over the first path;

and after a specific time, switching the first client service from the first path to the second path for sending.

In some exemplary embodiments, further comprising:

a first receiving module 1002, configured to receive a first command sent by a network management server; the first command is used for indicating the path switching of the first client service.

In some exemplary embodiments, the first sending module 1001 is further configured to: the first keep-alive frame is sent over the second path at the first rate.

In some exemplary embodiments, the first receiving module 1002 is further configured to:

receiving a second command sent by the network management server; the second command is used for indicating to delete the first path;

the source node further includes:

a first deleting module 1003, configured to delete the first path.

In some exemplary embodiments, the first sending module 1001 is further configured to:

respectively measuring time delay of the first path and the second path to obtain the time delay of the first path and the time delay of the second path;

the specific time is determined based on the time delay of the first path and the time delay of the second path.

In some exemplary embodiments, the first sending module 1001 is specifically configured to determine the specific time according to the time delay of the first path and the time delay of the second path by using at least one of the following methods:

if the time delay of the first path is greater than the time delay of the second path, determining that the specific time is t + delta;

if the time delay of the first path is smaller than the time delay of the second path and delta is larger than or equal to the absolute value of t, determining that the specific time is delta;

if the time delay of the first path is smaller than the time delay of the second path and delta is smaller than the absolute value of t, determining that the specific time is 0;

wherein t is a difference between the delay of the first path and the delay of the second path, and Δ includes at least one of: an error compensation value for the delay measurement and the time required to identify the path switch indication frame.

In some exemplary embodiments, the first sending module 1001 is specifically configured to implement sending the path switching indication frame through the first path by using one of the following methods:

sending a path switching indication frame through a first path according to a second rate;

and sending a fixed number of path switching indication frames through the first path, and sending a second keep-alive frame through the first path according to a third rate.

The specific implementation process of the source node is the same as that of the path switching method at the source node side in the foregoing embodiment, and is not described here again.

Fig. 11 is a block diagram of a sink node according to another embodiment of the present application.

In an eighth aspect, referring to fig. 11, another embodiment of the present application provides a sink node, including:

a second receiving module 1101, configured to detect a path switching indication frame in a first path, and switch from the first path to a second path to receive a first client service; the path switching indication frame is used for informing the sink node of path switching.

In some exemplary embodiments, the second receiving module 1101 is specifically configured to implement the detection of the path switching indication frame on the first path by adopting the following manner: detecting a path switching indication frame in N continuous frames of a first path; wherein N is an integer greater than or equal to 1.

In some exemplary embodiments, the second receiving module 1101 is further configured to:

the sink node further comprises: a second deleting module 1102, configured to delete the first path.

The specific implementation process of the sink node is the same as that of the path switching method at the sink node side in the foregoing embodiment, and is not described here again.

Ninth, referring to fig. 12, another embodiment of the present application provides a network management server, including:

a path establishing module 1201, configured to establish a second path for the first client service;

a second sending module 1202, configured to send the first command to the source node; the first command is used for indicating the path switching of the first client service.

In some exemplary embodiments, the second sending module 1202 is further configured to:

sending a second command to the source node and the sink node; wherein the second command is used for indicating to delete the first path.

In some exemplary embodiments, the network management server further comprises:

a determining module 1203 configured to:

determining the first customer service as the customer service needing path switching according to the bandwidth occupied by the second customer service; wherein, the second customer service is a newly added customer service;

or, determining the first customer service as the customer service needing path switching according to the target bandwidth occupied by the third customer service; wherein the third client service is the client service which needs to adjust the bandwidth.

The specific implementation process of the network management server is the same as that of the path switching method at the network management server side in the foregoing embodiment, and is not described here again.

In a tenth aspect, another embodiment of the present application provides a path switching system, including:

a source node to: stopping sending the first customer traffic over the first path; transmitting a path switching indication frame through a first path; the path switching indication frame is used for informing the host node of path switching; after a specific time, switching the first client service from the first path to the second path for sending;

and the sink node is used for detecting the path switching indication frame through the first path and switching from the first path to the second path to receive the first customer service.

In some exemplary embodiments, the source node is specifically configured to implement sending the path switch indication frame through the first path by using one of the following methods:

In some exemplary embodiments, the sink node is specifically configured to implement the detection of the path switch indication frame on the first path by:

detecting a path switching indication frame in N continuous frames of a first path; wherein N is an integer greater than or equal to 1.

In some exemplary embodiments, the source node is further configured to: the first keep-alive frame is sent over the second path at the first rate.

In some exemplary embodiments, the network management server is further configured to:

sending a second command to the source node and the sink node; the second command is used for indicating to delete the first path;

the source node is further configured to:

receiving a second command sent by the network management server, and deleting the first path;

the sink node is further to:

and receiving a second command sent by the network management server, and deleting the first path.

In some exemplary embodiments, the source node is further configured to:

respectively measuring time delay of the first path and the second path to obtain the time delay of the first path and the time delay of the second path; the specific time is determined based on the time delay of the first path and the time delay of the second path.

In some exemplary embodiments, the source node is specifically configured to determine the specific time according to the delay of the first path and the delay of the second path by using at least one of the following manners:

The specific implementation process of the path switching system is the same as that of the path switching method in the foregoing embodiment, and is not described here again.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by the computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted in a generic and descriptive sense only and not for purposes of limitation. In some instances, features, characteristics and/or elements described in connection with a particular embodiment may be used alone or in combination with features, characteristics and/or elements described in connection with other embodiments, unless expressly stated otherwise, as would be apparent to one skilled in the art. Accordingly, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the application as set forth in the appended claims.

Claims

1. A path switching method, comprising:

the source node sends a path switching indication frame through the first path; the path switching indication frame is used for informing a sink node of path switching;

and after a specific time, the source node switches the first customer service from the first path to the second path for sending.

2. The path switching method according to claim 1, wherein the second path is a path that has been created before the source node stops sending the first customer service through the first path.

3. The path switching method of claim 1, before the source node stops sending the first customer traffic over the first path, the method further comprising: and the source node sends a first keep-alive frame through the second path according to a first rate.

4. The path switching method of claim 1, before the source node stops sending the first customer traffic over the first path, the method further comprising:

the source node respectively carries out time delay measurement on the first path and the second path to obtain the time delay of the first path and the time delay of the second path;

and the source node determines the specific time according to the time delay of the first path and the time delay of the second path.

5. The path switching method according to claim 4, wherein the source node determining the specific time according to the delay of the first path and the delay of the second path comprises at least one of:

if the delay of the first path is greater than the delay of the second path, the source node determines that the specific time is t + delta;

if the time delay of the first path is less than the time delay of the second path and delta is greater than or equal to the absolute value of t, the source node determines that the specific time is delta;

if the delay of the first path is less than the delay of the second path and Δ is less than the absolute value of t, the source node determines that the specific time is 0;

wherein t is a difference between the delay of the first path and the one-way delay of the second path, and Δ includes at least one of: an error compensation value for the delay measurement and a time required to identify the path switch indication frame.

6. The path switching method according to any of claims 1-5, wherein the source node transmitting the path switching indication frame over the first path comprises one of:

the source node sends the path switching indication frame through the first path according to a second rate;

and the source node sends a fixed number of the path switching indication frames through the first path and sends a second keep-alive frame through the first path according to a third rate.

7. The path switching method according to any of claims 1-5, the method further comprising:

the host node detects the path switching indication frame in the first path, and switches from the first path to the second path to receive first customer service; wherein, the path switching indication frame is used for informing a sink node to switch paths.

8. An electronic device, comprising:

at least one processor;

memory having stored thereon at least one program which, when executed by the at least one processor, carries out a path switching method according to any one of claims 1-7.

9. A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a path switching method according to any one of claims 1-7.

10. A path switching system, comprising:

a source node to:

stopping sending the first customer traffic over the first path;

sending a path switching indication frame through the first path; the path switching indication frame is used for informing a sink node of path switching;

after a specific time, switching the first customer service from the first path to a second path for sending;