CN114339488A

CN114339488A - Ethernet service protection method and device in optical transmission network

Info

Publication number: CN114339488A
Application number: CN202111622964.6A
Authority: CN
Inventors: 陈江峰; 徐振宁; 刘春艳
Original assignee: Beijing Gw Delight Communication Technology Co ltd; Gw Delight Technology Co ltd; Beijing Gw Technologies Co ltd
Current assignee: Beijing Gw Delight Communication Technology Co ltd; Gw Delight Technology Co ltd; Beijing Gw Technologies Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-04-12
Anticipated expiration: 2041-12-28
Also published as: CN114339488B

Abstract

The application provides an Ethernet service protection method and device in an optical transmission network. The method comprises the following steps: receiving an Ethernet message; if the Ethernet message is determined to be a protocol message related to the aggregation link, packaging the Ethernet message into a first OSU data block; carrying out OSU cross processing on the first OSU data block; performing LAG protocol processing on the first OSU data block after OSU cross processing, and transmitting a processing result in a broadcast mode through OSU cross processing to perform Ethernet processing; if the Ethernet message is determined to be a service message, packaging the Ethernet message into a second OSU data block, and carrying out OSU cross processing on the second OSU data block; and performing aggregation processing on the second OSU data block after the OSU cross processing, and sending the second OSU data block to an Optical Transport Network (OTN) unit. The method can realize the protection of the Ethernet service in the optical transmission network on the premise of low cost.

Description

Ethernet service protection method and device in optical transmission network

Technical Field

The present invention relates to the field of communications transmission network technologies, and in particular, to a method and an apparatus for protecting an ethernet service in an optical transmission network.

Background

In the current mainstream device model, after ethernet services must be processed through ethernet switching, an ODUk/Optical Service Unit (OSU) cross Unit is performed through interlayer adaptation, and further transmission is performed in an Optical Transport Network (OTN)/M-OTN Network, so that protection of the ethernet services by the current OTN/M-OTN device is achieved by introducing the ethernet switching Unit.

In the implementation process of the prior art, the inventor finds that the introduction of the ethernet switching unit to implement the ethernet service protection increases service delay and increases the complexity of system implementation.

Disclosure of Invention

In view of this, the present application provides a method and an apparatus for protecting an ethernet service in an optical transmission network, which can implement protection of the ethernet service in the optical transmission network on the premise of low cost.

In order to solve the technical problem, the technical scheme of the application is realized as follows:

in one embodiment, an ethernet traffic protection apparatus in an optical transport network is provided, the apparatus comprising: the system comprises an Ethernet processing unit, a first OSU adapting unit, a second OSU adapting unit, an OSU crossing unit, an LAG protocol processing unit and an OSU aggregation unit;

the Ethernet processing unit is used for receiving an Ethernet message, and if the Ethernet message is determined to be a service message, the Ethernet message is sent to the second OSU adapting unit; if the Ethernet message is determined to be a protocol message related to the aggregation link, sending the protocol message to a first OSU adaptation unit;

the first OSU adaptation unit is configured to encapsulate the ethernet packet as a first OSU data block;

the second OSU adaptation unit is configured to encapsulate the ethernet packet as a second OSU data block;

the OSU crossing unit is used for carrying out OSU crossing processing on the first OSU data block and sending the OSU data block to the LAG protocol processing unit; carrying out OSU cross processing on the second OSU data block and sending the second OSU data block to an OSU aggregation unit;

the LAG protocol processing unit is configured to send, to the ethernet processing unit through the OSU cross unit in a broadcast manner, the message content corresponding to the first OSU data block that is subjected to OSU cross processing;

and the OSU aggregation unit is used for performing aggregation processing on the second OSU data block subjected to OSU cross processing and sending the second OSU data block to the OTN unit.

In another embodiment, a method for protecting ethernet traffic in an optical transport network is provided, the method comprising:

receiving an Ethernet message;

if the Ethernet message is determined to be a protocol message related to the aggregation link, packaging the Ethernet message into a first OSU data block; carrying out OSU cross processing on the first OSU data block; performing LAG protocol processing on the first OSU data block after OSU cross processing, and transmitting a processing result in a broadcast mode through OSU cross processing to perform Ethernet processing;

if the Ethernet message is determined to be a service message, packaging the Ethernet message into a second OSU data block, and carrying out OSU cross processing on the second OSU data block; and performing aggregation processing on the second OSU data block after the OSU cross processing, and sending the second OSU data block to the OTN unit.

As can be seen from the above technical solutions, in the above embodiments, in the ethernet service protection device for an optical transport network, not only the service packet is encapsulated as an OSU data block, but also the protocol packet related to the aggregation link is also independently encapsulated as an OSU data block, and LAG protocol processing is performed, so that ethernet service protection in the optical transport network can be implemented on the premise of low cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an ethernet service protection device in an optical transmission network according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the frame structure of an OSU;

fig. 3 is a schematic diagram illustrating an ethernet service protection process in an optical transmission network according to an embodiment of the present application;

fig. 4 is a schematic diagram illustrating an ethernet service protection process in an optical transmission network according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.

The technical solution of the present invention will be described in detail with specific examples. Several of the following embodiments may be combined with each other and some details of the same or similar concepts or processes may not be repeated in some embodiments.

An ethernet service protection device in an optical transmission network is provided in this embodiment, referring to fig. 1, fig. 1 is a schematic structural diagram of an ethernet service protection device in an optical transmission network in this embodiment. The device comprises: an Ethernet processing unit, a first OSU adapting unit, a second OSU adapting unit, an OSU crossing unit, a Link Aggregation (LAG) protocol processing unit and an OSU Aggregation unit;

In the embodiment of the present application, an ethernet switching unit does not exist in the ethernet service protection apparatus in the optical transport network, and not only encapsulates the service packet into the OSU data block, but also independently encapsulates the protocol packet related to the aggregation link into the OSU data block, and performs LAG protocol processing, so as to implement protection of the ethernet service in the optical transport network without adding the ethernet switching unit.

Because the Ethernet switching unit is not added, the processing time delay is not additionally introduced, and the complexity and the power consumption of equipment implementation are not increased; if the switching unit is between the boards, the D-LAG protection of the cross board card can not be realized through the Ethernet unit; the implementation of the present application is not limited to the application scenario of whether the board card is crossed, and therefore, in the embodiment of the present application, the protection of the ethernet service in the optical transmission network can be implemented on the premise of low cost.

During specific implementation, the OSU of the specified aggregation is sent to the OSU aggregation unit for processing, and then sent to the OTN unit for processing; and for the OSU of the non-specified aggregation, directly sending the OSU to the OTN unit for processing.

In the embodiment of the present application, when the second OSU adaptation unit encapsulates the OSU data block, all the code pattern combinations in the 66b combination may not be used, and only the specified code pattern combination is used; the first OSU adaptation unit may use all the code pattern combinations in the 66b combination, or may use only the specified code pattern combination to perform the encapsulation of the OSU data block;

the combination of the specified patterns can separate more than two ethernet messages in a 256B code block, i.e. the end of the last ethernet message and the start of the next ethernet message do not occur within the 256 code block.

The same 256B code block (4 66B codes) is from the same ethernet packet, which facilitates subsequent OSU aggregation based on the 256B code block.

Referring to table 1, table 1 shows contents corresponding to a transcoding mapping relationship of 256B 4 bits of control information.

TABLE 1

In table 1, there are 16 66b combinations, and the code pattern combinations specified in the embodiments of the present application include 7 of them, specifically: DDDD, IIII, TIII, SDDD, DTII, DDTI and DDDT.

Frame structure of encapsulated OSU referring to fig. 2, fig. 2 is a schematic diagram of a frame structure of an OSU. Which is 192 bytes in length. Where bytes 1 to 7 are an overhead area and bytes 8 to 192 are payload areas.

The OSU overhead includes OSU generic overhead and OSU mapping overhead.

The branch port number (TPN) is 12 bits in length, is located at overhead positions of bits 3 to 8 of a 1 st byte and bits 1 to 6 of a 2 nd byte, is used for identifying the branch port, and can represent a range of 0 to 4095 and has effective values of 1 to 4000

The Frame Type (FT) has a length of 3 bits, and is located at bits 7 to 8 of the 2 nd byte and bit 1 of the 3 rd byte, for identifying the frame type.

In the OSU technology, a method of ethernet mapping is defined, ethernet traffic is demapped into MAC frames, and the MAC frames (not including preamble, SFD and IPG) are 64b/66b encoded. Then the 64b/66b code is converted into 256b/257b, the 66b code stream realizes the quick transmission of the 66b code into 257b code block by inserting 66b IDLE code blocks, and the 66b IDLE code blocks are inserted only in the frame gaps. When the OSU frame finishes the mapping of the current MAC frame but does not fill the payload area of the OSU frame, and meanwhile, the next MAC frame is not received, the method allows the inserting of 66b IDLE code blocks after the T code block corresponding to the current MAC frame and then carries out 257b transcoding.

In the embodiment of the application, only 7 code pattern combinations are selected for packaging, and the packaging format and content are not changed.

If the second OSU adapting unit uses the 7 code patterns to perform OSU data block encapsulation, the OSU aggregating unit may be specifically configured to perform aggregation processing on the second OSU data block by the following steps:

analyzing the second OSU data block to obtain 66b combinations, and deleting IIII combinations in the obtained 66b combinations;

since all the IIII combinations are IDLE, the deletion process is directly performed, that is, the invalid code combination is deleted.

Storing the effective code combination into a cache, namely storing the rest code combinations into the cache;

when obtaining the OSU data block appointed to be aggregated, if detecting 66b combination of the last block as an I block or a T block, determining that the Ethernet message corresponding to the current code block is finished, and generating a third OSU data block, namely OSU regeneration.

In this embodiment of the present application, when the LAG protocol processing unit processes the first OSU data block, the message content corresponding to the first OSU data block is obtained as follows: and sending a message through the Ethernet port, or informing the port of the information.

Wherein the port information is informed, such as the expected MAC address, VLAN information, etc.

The LAG protocol processing unit is specifically configured to encapsulate, according to the packet content corresponding to the first OSU data block, a third OSU data block when the packet content corresponding to the first OSU data block is sent to an ethernet processing unit in a broadcast manner through a cross OSU, and send the third OSU data block to the OSU cross unit;

the OSU crossing unit is further used for carrying out OSU crossing processing on the third OSU data block and broadcasting the third OSU data block to the second OSU adapting unit;

the second OSU adapting unit is further configured to analyze the third OSU data block subjected to OSU cross processing to generate an ethernet message, and send the ethernet message to the ethernet processing unit;

the ethernet processing unit is further configured to perform corresponding processing on the ethernet packet if it is determined that the ethernet packet is a packet that needs to be processed by the unit; otherwise, discarding the Ethernet message.

In the embodiment of the present application, an OSU sent by an OTN unit is also received, and the specific processing is:

the OSU cross unit is further configured to, when receiving a fourth OSU data block sent by the OTN unit, perform cross processing broadcast and send the fourth OSU data block to the second OSU adaptation unit;

the second OSU adaptation unit is further configured to decapsulate the fourth OSU data block to generate an ethernet packet, and send the ethernet packet to the ethernet processing unit;

The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or further divided into a plurality of sub-units.

The following describes in detail an ethernet service protection process in an optical transmission network according to an embodiment of the present application with reference to the accompanying drawings. . Referring to fig. 3, fig. 3 is a schematic diagram illustrating an ethernet service protection process in an optical transmission network according to an embodiment of the present application. The method comprises the following specific steps:

step 301, receiving an ethernet packet.

Step 302, if it is determined that the ethernet packet is a protocol packet related to an aggregation link, encapsulating the ethernet packet into a first OSU data block.

And 303, performing OSU cross processing on the first OSU data block.

And step 304, performing LAG protocol processing on the first OSU data block after the OSU cross processing, and sending a processing result in a broadcast mode through the OSU cross processing to perform ethernet processing. The flow is ended.

In this step, when the processing result is sent in a broadcast manner through the OSU cross processing to perform the ethernet processing, the method specifically includes:

packaging the processing result into a third OSU data block, and performing OSU cross processing broadcast transmission; wherein the processing result is: a message sent through an Ethernet port, or information of a notification port;

analyzing each third OSU data block which is sent by broadcasting and is subjected to OSU cross processing, and generating an Ethernet message;

if the Ethernet message is determined to be a message needing to be processed, the Ethernet message is correspondingly processed; otherwise, discarding the Ethernet message.

During specific implementation, a plurality of ethernet processing units all receive corresponding ethernet messages, each ethernet processing unit determines whether the ethernet message is a message that needs to be processed by the unit, and if so, performs corresponding processing, such as forwarding the ethernet message through a corresponding port, performing relevant configuration on information of the corresponding port, and the like; and if not, directly discarding the Ethernet message.

Step 305, if it is determined that the ethernet packet is a service packet, encapsulating the ethernet packet into a second OSU data block.

In this step, when the ethernet packet is encapsulated as the second OSU data block, the ethernet packet is encapsulated by the specified code pattern; wherein the specified pattern is capable of separating two or more Ethernet messages in a 256B code block.

The specific packaging method is the same as the existing implementation and is not described in detail here.

And step 306, performing OSU cross processing on the second OSU data block.

And 307, performing aggregation processing on the second OSU data block after the OSU cross processing, and sending the second OSU data block to the OTN unit.

If the specified code pattern is used for packaging, the specific step of carrying out aggregation processing on the second OSU data block after OSU cross processing comprises the following steps:

analyzing the second OSU data block to obtain 66b combination;

deleting the IIII combination in the acquired 66b combination, and storing the effective code into a cache;

Wherein the specified pattern comprises: DDDD, IIII, TIII, SDDD, DTII, DDTI and DDDT.

In this embodiment of the present application, a processing procedure for sending an OSU data block to an ethernet direction based on an OTN unit is shown in fig. 4, and fig. 4 is a schematic diagram of an ethernet service protection flow in an optical transmission network in another embodiment of the present application. The method comprises the following specific steps:

step 401, when receiving the fourth OSU data block sent by the OTN unit, performing OSU cross processing and broadcast sending.

Step 402, analyzing each fourth OSU data block which is sent by broadcasting and is subjected to OSU cross processing, and generating an ethernet message.

Step 403, if it is determined that the ethernet packet is a packet that needs to be processed, performing corresponding processing on the ethernet packet; otherwise, discarding the Ethernet message.

In this embodiment of the present application, each ethernet unit receives an ethernet packet corresponding to the broadcasted fourth OSU data block, and performs corresponding processing if the ethernet packet is determined to be a packet processed by the ethernet processing unit; otherwise, it is directly discarded.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An ethernet traffic protection apparatus in an optical transmission network, the apparatus comprising: the system comprises an Ethernet processing unit, a first optical service unit OSU adapting unit, a second OSU adapting unit, an OSU crossing unit, a link aggregation LAG protocol processing unit and an OSU aggregation unit;

2. The apparatus of claim 1,

the second OSU adaptation unit is specifically configured to, when the ethernet packet is encapsulated as a second OSU data block, encapsulate the ethernet packet by using a specified code pattern; wherein the specified pattern is capable of separating two or more Ethernet messages in a 256B code block.

3. The apparatus of claim 2,

the code pattern specified by the second OSU adaptation unit comprises: DDDD, IIII, TIII, SDDD, DTII, DDTI and DDDT;

the OSU aggregating unit is specifically configured to, when aggregating the second OSU data block, analyze the second OSU data block to obtain a 66b combination, delete an IIII combination in the obtained 66b combination, and store an effective coding combination in a cache; and when the OSU data block of the appointed aggregation is obtained, if the last block of the 66b combination is detected to be an I block or a T block, determining that the Ethernet message corresponding to the current code block is finished, and generating a third OSU data block.

4. The apparatus of claim 1,

the LAG protocol processing unit is specifically configured to encapsulate, according to the packet content corresponding to the first OSU data block, a third OSU data block when the packet content corresponding to the first OSU data block is sent to an ethernet processing unit in a broadcast manner through a cross OSU, and send the third OSU data block to the OSU cross unit; wherein, the message content corresponding to the first OSU data block is: a message sent through an Ethernet port, or information of a notification port;

5. The apparatus according to any one of claims 1 to 4,

6. A method for protecting ethernet traffic in an optical transmission network, the method comprising:

receiving an Ethernet message;

if the Ethernet message is determined to be a protocol message related to the aggregation link, packaging the Ethernet message into a first optical service unit OSU data block; carrying out OSU cross processing on the first OSU data block; performing link aggregation LAG protocol processing on the first OSU data block after OSU cross processing, and transmitting a processing result in a broadcast mode through OSU cross processing to perform Ethernet processing;

if the Ethernet message is determined to be a service message, packaging the Ethernet message into a second OSU data block, and carrying out OSU cross processing on the second OSU data block; and performing aggregation processing on the second OSU data block after the OSU cross processing, and sending the second OSU data block to an Optical Transport Network (OTN) unit.

7. The method of claim 6,

when the Ethernet message is packaged into a second OSU data block, the Ethernet message is packaged through a specified code pattern; wherein the specified pattern is capable of separating two or more Ethernet messages in a 256B code block.

8. The method of claim 7, wherein the aggregating the second OSU data block after OSU interleaving comprises:

analyzing the second OSU data block to obtain 66b combination;

and when the OSU data block of the appointed aggregation is obtained, if the last block of the 66b combination is detected to be an I block or a T block, determining that the Ethernet message corresponding to the current code block is finished, and generating a third OSU data block.

9. The method of claim 6, wherein the sending the processing result in a broadcast manner for Ethernet processing through OSU cross processing comprises:

packaging the message content corresponding to the first OSU data block into a third OSU data block, and performing OSU cross processing broadcast transmission; wherein, the message content corresponding to the first OSU data block is: a message sent through an Ethernet port, or information of a notification port;

10. The method according to any one of claims 6-9, further comprising:

when a fourth OSU data block sent by the OTN unit is received, OSU cross processing is carried out and broadcast sending is carried out;

analyzing each fourth OSU data block which is sent by broadcasting and is subjected to OSU cross processing, and generating an Ethernet message;