CN107395479B - Lossless ring network switch, lossless self-healing ring network and data communication method thereof - Google Patents

Abstract

The present disclosure relates to a lossless ring network switch, including: a switching logic unit and a routing logic component. The routing logic component comprises a data reorganization unit, an ID learning unit and a routing decision unit, wherein the ID learning unit learns the ID of the source lossless ring network switch, the data reorganization unit adds or strips a routing protocol containing the ID of a destination switch, the ID of a local switch and a data frame serial number for a data frame, and the routing decision unit routes the data frame which is not registered and is destined to the ID of the local switch to the direction of an opposite network link port only, routes the data frame which is not registered and is destined to the ID of the local switch to the direction of the data reorganization unit of the local lossless ring network switch, and discards the data frame of which the frame serial number is registered.

Description

Lossless ring network switch, lossless self-healing ring network and data communication method thereof

technical field

The disclosure relates to a switch, in particular to a lossless ring network switch, a lossless self-healing ring network formed by the lossless ring network switch, and a data communication method for the lossless ring network.

Background technique

Currently, industrial ring networks include lossy switching ring networks (non-zero self-healing) and lossless switching ring networks. The lossless ring switch used in the lossless switching ring network, such as the HSR switch, adopts the international standard IEC62439, which utilizes PRP (parallel Redundancy protocol) and HSR (High-availability Seamless protocol). Although the lossy switching ring network has its inherent advantages, in the environment with high technical requirements for data, because the lossy switching ring network cannot meet user requirements (for example, there is a problem of data loss), some industrial applications use Lossless switching ring network. However, in the current lossless switching ring network, that is, the zero self-healing ring network, the self-healing mechanism of the switch is based on the Ethernet source MAC learning mechanism, and the self-healing transmission is achieved by using the own data packet ID in the Ethernet data protocol. . In this way, when there are a large number of devices on the network, a large amount of resources are required to store the MAC, as well as to search for the MAC and compare the packet ID for a long time. Therefore, the limited resources and the search and comparison method greatly reduce the amount of device access and bandwidth usage. Rate. This also leads to the limitation of the number of access devices of the current zero self-healing lossless ring network switch (usually no more than 512), so it cannot be applied to industrial occasions where access devices are used on a large scale.

Therefore, it is desired to provide a lossless ring network applicable to industrial occasions with a large number of access devices.

Contents of the invention

To this end, the disclosure provides a lossless ring network switch, including: one or more device ports; a pair of network link ports; a switching logic unit that learns from the data frames of the network link ports based on the source MAC address learning mechanism source MAC address and form the MAC address table; and a routing logic component, which includes a data reorganization unit, an ID learning unit, and a routing decision unit, and the ID learning unit learns from a data frame transmitted from one of the network link ports The source lossless ring network switch ID contained in the routing protocol and form the source lossless ring network switch ID table in the ring network, the data recombination unit is based on the destination MAC in the data frame for the data frame sent from the switching logic unit The address searches the local source lossless ring network switch ID table to obtain the destination switch ID corresponding to the destination MAC and adds the obtained destination switch ID, the local switch ID and the ID generated based on the source switch ID to the data frame. The routing protocol of the data frame sequence number and the routing protocol added for the stripping of the data frame transmitted from the network link port, and the routing decision-making unit determines that the destination switch ID contained in the routing protocol is not the local switch ID and the data frame sequence The data frame whose number has not been registered is only routed to the direction of the network link port opposite to the network link port receiving the data frame, and the destination switch ID contained in the routing protocol is the local switch ID and the sequence number of the data frame has not been registered The data frame is routed to the direction of the data reassembly unit of the local lossless ring network switch, and the data frame whose frame sequence number has been registered is discarded.

According to the lossless ring network switch of the present disclosure, wherein the data reassembly unit strips the added routing protocol in the data frame when the routing decision-making unit routes the data frame to the direction of the data reassembly unit of the local lossless ring network switch sent to the switching logic unit.

According to the lossless ring network switch of the present disclosure, if the data frame from the network link port is an unregistered data frame, the data reassembly unit reassembles a data frame that does not contain data based on the routing protocol of the received data frame content blocking packet, and the routing decision-making unit routes the blocking packet to the direction of the network link port opposite to the network link port receiving the data frame.

According to the lossless ring network switch of the present disclosure, the routing decision unit determines whether the received data frame has been registered based on the source lossless ring network switch ID and the data sequence number included in the received data frame.

According to another aspect of the present disclosure, a lossless self-healing ring network composed of a plurality of lossless ring network switches of the present disclosure is provided.

According to another aspect of the present disclosure, a lossless ring network data communication method is provided, including: a first data frame sent by a first user equipment from a user equipment port of a first lossless ring network switch via a first switching logic unit; The first data reorganization unit of a lossless ring network switch adopts a hash algorithm to obtain the destination MAC address corresponding to the destination MAC address based on the destination MAC address in the first data frame and the source lossless ring network switch ID table in the first lossless ring network switch. The destination lossless ring network switch ID, adding a route including the acquired destination lossless ring network switch ID, the first lossless ring network switch ID, and the data frame sequence number generated based on the first lossless ring network switch ID for the first data frame protocol, and make a copy of the first data frame after adding the protocol; the first data frame and its copy are respectively routed to a part of the first lossless ring network switch by the first routing decision-making unit of the first lossless ring network switch For the direction of the network link port; when the second ID learning unit of at least one second lossless ring network switch receives the first data frame from the first user equipment through one of its paired network link ports, based on the source address learning mechanism, Learning the first lossless ring switch ID included in the routing protocol of the first data frame and forming a source lossless ring switch ID table in the ring network; and the second routing decision unit of at least one second lossless ring switch passing When one of the paired network link ports receives the first data frame from the first user equipment, the destination switch ID included in the routing protocol is not the local switch ID and the data frame sequence number has not been registered for the first data frame Only route to the direction of the network link port opposite to the network link port receiving the first data frame, the destination lossless ring network switch ID included in the routing protocol is the second lossless ring network switch ID and the data frame sequence number has not been registered The first data frame is routed to the direction of the second data reassembly unit of the second lossless ring network switch, and the first data frame whose frame sequence number has been registered is discarded.

According to the lossless ring network data communication method of the present disclosure, it further includes: when the second routing decision unit routes the first data frame to the direction of the second data reassembly unit, the second data reassembly unit strips the added The routing protocol is sent to the second switching logic unit of the second lossless ring network switch.

According to the lossless ring network data communication method of the present disclosure, it further includes: following the second routing decision-making unit, routing the first data frame whose destination lossless ring network switch ID is the second lossless ring network switch ID to the second data recombination In the direction of the unit, the second data reassembly unit reassembles a blocking packet that does not contain substantial data content based on the routing protocol of the received first data frame, and routes the blocking packet to the network link that receives the first data frame Port-relative network link port direction.

According to the lossless ring network data communication method of the present disclosure, it further includes: when the data frame sequence number of the first data frame has not been registered by the second ID learning unit, combining the data sequence number of the first data frame with the first lossless ring network switch IDs are associated and registered in the data frame serial number registration table.

By adopting the lossless ring network switch of the present disclosure, since it only learns the ID of the source switch for the data frame, and checks the pair of the ID of the destination switch and the sequence number of the data frame of the source switch, the data exchange speed of the switch is greatly reduced , because the number of switches on the ring network is much smaller than the number of access devices, so the number of MACs of a single lossless ring network switch according to the present disclosure can reach more than 16K (equivalent to the capacity of a single switch chip). Its transmission rate can reach more than 90% of the line speed (line design speed).

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of a lossless ring network switch according to an embodiment of the present invention.

FIG. 2 is a flow chart of a process for processing locally sourced data frames by a lossless ring network switch according to the present disclosure.

FIG. 3 is a flow chart showing the processing process of the lossless ring network switch for the data frame from the network link port according to the present disclosure.

FIG. 4 is a schematic diagram of a lossless ring network composed of lossless ring network switches according to the present disclosure.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to limit the present disclosure. As used in this disclosure and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, a first switch may also be called a second switch, and vice versa, without departing from the scope of the present disclosure. Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to a determination."

In order to enable those skilled in the art to better understand the present disclosure, the present disclosure will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of a lossless ring network switch 100 according to an embodiment of the present invention. As shown in Figure 1, the lossless ring network switch 100 (for convenience of description, the lossless ring network switch of the present disclosure is referred to as "NET switch" below), including: one or more device ports C, routing logic components 110 and switching logic Unit 120. The routing logic component 110 and the switching logic unit 120 implement data interaction in a single-channel or multi-channel manner.

The routing logic component 110 includes at least one pair of network link ports, that is, transmission channels A and B. The switching logic unit 120 is connected to one or more device ports C, and the device ports C are connected to user equipment. The user equipment generates a data frame and sends the data frame to the switching logic unit 120 via the port C. The switching logic unit 120 learns the MAC address of the source device received from the outside based on the source address learning mechanism, forms the source device MAC address table of the received data frame, and updates the MAC address table according to the conventional aging mechanism. The MAC address table is similar to the MAC address table in a conventional switch, for example, includes a MAC address and a port number.

The routing logic component 110 includes an ID learning unit 111 , a routing decision unit 112 and a data reorganization unit 113 . The switching logic unit 120 transmits the received user data frame to the routing logic component 110 . The data frame sent by the switching logic unit 120 will contain the routing protocol of the data frame sent by the conventional switch. In order to distinguish the data frames sent by different switches, the data reassembly unit 113 of the switch in the present disclosure will add data generated based on the ID of the lossless ring network switch 100 to the data frames sent from the lossless ring network switch to which it belongs frame sequence number. Therefore, all data frames transmitted on the ring network including the lossless ring network switch of the present disclosure include a data frame sequence number associated with the ID of the source switch. Moreover, the data reassembly unit 113 will also add a layer of routing protocol to the data frame to be sent, and the added layer of routing protocol will include the ID of the local lossless ring network switch, that is, the source switch ID.

Based on the source address learning mechanism, the ID learning unit 111 learns the source switch ID for the data frames from the network link channel A or B, that is, the transmission channel A or B, to form a source switch ID table. Table 1 shows an example of a source switch ID table.

Table 1:

Specifically, for a data frame from a network link port, various algorithms are used based on its source MAC address, such as a hash algorithm (if there are other algorithms, you can continue to give examples), etc., to obtain the index of each MAC address, and The index, the MAC identification field, the source switch ID and corresponding attributes are stored in Table 1 above.

For this reason, when the local user equipment wants to communicate with a certain user equipment, the initial routing protocol of the original data frame will include the MAC address of the user equipment as the destination MAC address. When the data reassembly unit 113 receives the data frame, it will also use the same algorithm based on the destination MAC address in the data frame, such as a hash algorithm, to obtain its corresponding index, and based on the index in the above-mentioned source switch ID The source switch ID to which the destination MAC address belongs or corresponds is found in the table, and the found switch ID is included as the destination switch ID in the added layer of routing protocol. The source switch ID can be updated using an existing aging mechanism of the MAC address table.

Therefore, the data reassembly unit 113 adds a layer of routing protocol to the data frame to be sent, which will include the lossless ring network switch ID (as the source switch ID) to which the data reassembly unit 113 belongs, and the lossless ring network switch ID to which the destination MAC address in the data frame belongs. The ring network switch ID (as the destination switch ID) and the sequence number of the data frame generated based on the source switch ID.

The ID learning unit 111 will also register the data frame sequence numbers of the data frames from the network link channel A or B, that is, the transmission channel A or B, to form a data frame sequence number table associated with the source switch ID. Specifically, for the serial number of the data frame that does not have in the existing data frame serial number table, it is judged as a newly received data frame, and its data frame serial number is registered in the data frame serial number table, thereby updating the data Frame sequence number table. Table 2 below shows an example of such a data frame sequence number table.

Table 2

Although the learning and updating of Table 1 and Table 2 are both handled by the ID learning unit 111 in this disclosure, they may also be handled by different units. Although Table 2 is described separately, the contents of Table 2 can also be combined in Table 1 to form only one learning table.

Therefore, when the switch 100 according to the present disclosure wants to send a piece of data, after the data reorganization unit 113 adds a layer of routing protocol based on the destination MAC of the data frame for reorganization, a new data frame will be formed. The structure example of the new data frame As in Table 3:

table 3

After the original data frame is added with a routing protocol, it still contains its own original data and original routing protocol data, and may also contain other user protocols.

FIG. 2 is a flow chart of the processing process of the lossless ring network switch 100 for locally originating data frames according to the present disclosure. As shown in Figure 2, first at step S210, the switching logic unit 120 sends out the original data frame, and then the data reassembly unit 113 searches Table 1 for the destination MAC address corresponding to the destination MAC address based on the hash algorithm based on the data frame. The switch ID of the local switch ID, and generate the data frame sequence number associated with the source switch ID based on the local switch ID. Then at step S230, the data frame to be sent is reassembled, that is, a layer of routing protocol is added, that is, a routing protocol including the source switch ID and the destination switch ID, and the sequence number of the data frame generated based on the source switch ID is added. The data frame sequence number generated based on the source switch ID can also be directly included in the routing protocol as a routing protocol data field for addition. After the reorganization is performed, a copy of the reorganized data is copied and sent to the routing decision unit 112 . At step S240, the routing decision unit 112 routes the reassembled data frame and its copy to the direction of the paired network link ports A and B, so as to be sent to the ring network link.

It should be pointed out that if the sent data frame is a broadcast data frame or a multicast data frame, the destination switch ID in the routing protocol field added to the data frame is processed as all Fs in a conventional manner. Of course, other identifiers may also be used to indicate the destination switch ID to indicate that the data frame is a broadcast frame. Although the above routing protocol is added at the head of the data frame, the length and adding position of the routing protocol can be set arbitrarily according to the application.

FIG. 3 is a flow chart of the processing process of the lossless ring network switch 100 from the network link port according to the present disclosure. As shown in FIG. 3 , first, at step S310 , the lossless ring network switch 100 according to the present disclosure receives a data frame from the network link port A or B. Subsequently, at step S320, the ID learning unit 111 learns the source switch ID of the data frame based on the source address learning mechanism, and uses a hash algorithm to match the source MAC in the data frame with the source switch ID to obtain a source switch ID table. Subsequently, in step S330, the ID learning unit 111 obtains the data frame sequence number associated with the source switch ID in the data frame, and queries the above Table 1 to check whether the data frame has been registered. If it has been registered, the routing decision unit 112 does not perform any routing processing on the data frame and discards the data frame. If it has not been registered, then at step S340, the ID learning unit 111 registers the new data frame sequence number and the source switch ID in the above table 2 in association. Subsequently, at step S350, the destination switch ID of the data frame is checked with the local switch ID to determine whether they are the same. On the one hand, if the destination switch ID is identical to the local switch ID, the routing decision unit then sends the data route to the data reassembly unit 113, so that at step S380, the data reassembly unit 113 strips off the added side routing protocol of the data frame , so that the data frame is sent to the switching logic unit 120, and finally at step S395, received by the local user equipment. At the same time, at step S390, the data reassembly unit 113 reassembles a blocking packet based on the original routing protocol of the data frame, that is, an empty data packet containing only the routing protocol. Then, at step S370, the blocking packet is routed to another network link port opposite to the network link port receiving the data frame. On the other hand, if the destination switch ID is different from the local switch ID, it is judged at step S360 whether the data frame is a broadcast frame. If it is a broadcast frame, the above operations at steps S380 and S370 are also performed.

Although the steps S330-360 are described above in sequence, this is not a fixed sequence, or in other words, there is no sequential relationship between them. The judgment described later here will also take the result of the first judgment as the judgment condition. For example, it is possible to directly judge whether the data frame is a broadcast frame, without the premise of judging whether the destination switch ID is the local switch ID. Likewise, judging whether it is a registered data frame is not a prerequisite for judging whether its destination switch ID is a local switch ID. Moreover, these judgment processes can be carried out simultaneously without any influence.

Through the above-mentioned processing of the NET switch 100 for the data from the network link port A or B, it can be known that when the switch performs data routing, it only needs to learn the source switch ID, and form a small number of switch ID learning tables, and perform Routing only needs to verify the ID of the destination switch and the sequence number of the data frame under the source switch ID. Therefore, the destination address table traversed by the switch during the data exchange process, especially the data verification and destination address process during the forwarding process, is very small, and the time spent is shorter, thereby speeding up the data exchange process. Therefore, the number of devices on the ring network will not be limited as the number of user devices on the existing ring network, and the number of user devices that can be connected to the ring network will increase geometrically, thereby expanding the application scale of the industrial ring network.

Moreover, the switch logic unit 120 associated with the local switch can still retain the routing protocol of the existing ring network, which only learns the MAC addresses of other switch ports communicating with it, so it does not need to learn only through the switch without downloading to the local The MAC address of the destination device contained in the data frame of the user equipment does not need to learn the MAC addresses of all user equipment on the entire ring network. Therefore, its MAC address table will also be greatly reduced. The source MAC address of the actual use process is stored in it, and the speed of data exchange is improved.

FIG. 4 is a schematic diagram of a ring network formed by a lossless ring network switch 100 according to the present disclosure. As shown in FIG. 4 , for simplicity, the ring network 400 only includes four lossless ring network switches 100 - 1 , 100 - 2 , 100 - 3 and 100 - 4 . In the traditional zero self-healing and lossless ring network switch, the source device sends out a packet, and the data packet with a short transmission path to the target device is received by the target device first, while the data packet with a long transmission path still needs to be transmitted to the target device in the network to judge whether it is needed throw away. In this way, the transmission of the data packet covers the entire ring network network, and when the amount of data packets and data is large, the bandwidth utilization rate of the ring network network is reduced. On the ring network shown in FIG. 4 , when the first user equipment (that is, the source equipment) connected to the first lossless ring network switch 100-1 sends the first data frame, the first routing decision unit 112 on the A bidirectional route is sent to the second lossless ring network switch 100-2 and the fourth lossless ring network switch 100-4. When the second lossless ring network switch 100-2 or the fourth lossless ring network switch 100-4 determines that the destination switch ID of the first data frame is not the ID of the second local switch, the first data frame is forwarded to the lossless ring network switch. Other switches between the network switches 100-2 and 100-4, such as the third lossless ring network switch 100-3; if the second lossless ring network switch 100-2 or the fourth lossless ring network switch 100-4 is determining the data When the destination switch ID of the frame is the ID of the second lossless ring network switch 100-2 or the fourth lossless ring network switch 100-4, the first data frame is directly downloaded to the local device. Usually the data frame sent by the source device will be relatively large. If the second lossless ring network switch 100-2 has received the first data frame transmitted from one direction, the repeated first data frame transmitted in the other direction will be discarded after being received by the destination switch . The transmission process of such repeated data frames will occupy too much transmission time of the ring network.

In order to shorten the transmission time of the ring network occupied by the repeated first data frame, the present disclosure particularly proposes a method for stopping the continuous transmission of the repeated first data frame in advance. For example, when the destination switch ID of the first data frame is the ID of the second lossless ring network switch and the data frame is received for the first time, as shown in FIG. 4 , the second data reassembly unit 113 immediately based on The routing protocol of the received data frame reassembles a blocking packet that does not contain substantial data content, and the second routing decision unit routes the blocking packet to the network link port that receives the data frame received from the network link port Relative network link port direction. Since the blocking packet does not contain the substantial data content of the original data frame, it mainly contains routing protocol data and the sequence number of the data frame. Therefore, the size of the blocking packet is usually only about 60 bytes, which is far smaller than the size of the original data frame (for example, 500 bytes). Therefore, the blocking packet will be transmitted at a faster speed in a direction opposite to the transmission direction of the repeated first data frame. Thus, when the second lossless ring network switch 100-3 first receives the blocking packet, since the switch 100-3 has received the blocking packet containing the routing information of the original data frame, when When receiving a copy of the first data frame, the routing decision unit 112 will judge that the switch has forwarded the data frame and discard the duplicate data frame at the third lossless ring network switch 100-3, thereby eliminating the repeated first data frame. A data frame is forwarded by the third lossless ring network switch 100-3 to the link channel between it and the second lossless ring network switch 100-2, thereby shortening the time that the repeated first data frame occupies the transmission channel, so The utilization efficiency of the ring network is improved.

The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be pointed out that those of ordinary skill in the art can understand that all or any steps or components of the methods and devices of the present disclosure can be implemented on any computing device (including processors, storage media, etc.) or a network of computing devices, implemented with hardware, firmware, software, or a combination thereof, this is a person of ordinary skill in the art who uses their basic knowledge after reading the descriptions of the present disclosure. programming skills will do.

Therefore, the object of the present disclosure can also be achieved by running a program or a group of programs on any computing device. The computing device may be a known general-purpose device. Therefore, the object of the present disclosure can also be achieved only by providing a program product including program codes for realizing the method or device. That is, such a program product also constitutes the present disclosure, and a storage medium storing such a program product also constitutes the present disclosure. Obviously, the storage medium may be any known storage medium or any storage medium developed in the future.

It should also be pointed out that, in the apparatus and method of the present disclosure, obviously, each component or each step can be decomposed and/or reassembled. These decompositions and/or recombinations should be considered equivalents of the present disclosure. Also, the steps for performing the above series of processes may naturally be performed in chronological order in the order described, but need not necessarily be performed in chronological order. Certain steps may be performed in parallel or independently of each other.

The specific implementation manners described above do not limit the protection scope of the present disclosure. It should be apparent to those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present disclosure shall be included within the protection scope of the present disclosure.

Claims (9)

1. A lossless ring network switch comprising:

one or more device ports;

a pair of network link ports

The switching logic unit learns the source MAC address in the data frame from the network link port based on a source MAC address learning mechanism and forms an MAC address table; and

a routing logic component including a data reorganizing unit that learns a source lossless ring network switch ID included in a routing protocol in a data frame transmitted from one of the network link ports and forms a source lossless ring network switch ID table in a ring network, an ID learning unit that searches a locally located source lossless ring network switch ID table based on a destination MAC address in the data frame for the data frame transmitted from the switching logic unit to acquire a destination switch ID corresponding to the destination MAC and adds a routing protocol including the acquired destination switch ID, the local switch ID, and a data frame sequence number generated based on the source switch ID and a routing protocol added for stripping the data frame transmitted from the network link port, and a routing decision unit that changes the destination switch ID included in the routing protocol from the local switch ID and the data frame sequence number The unregistered data frame is routed only to a network link port direction opposite to a network link port that receives the data frame, the data frame whose destination switch ID contained in the routing protocol is a local switch ID and whose frame sequence number is not registered is routed to a data reassembly unit direction of the local lossless ring network switch, and the data frame whose frame sequence number has been registered is discarded.

2. The lossless ring network switch of claim 1, wherein the data reassembly unit sends the data frame to the switching logic unit after stripping the routing protocol added to the data frame when the routing decision unit routes the data frame to the direction of the data reassembly unit of the local lossless ring network switch.

3. The lossless ring network switch according to claim 1 or 2, wherein the data reassembly unit reassembles a blocking packet mainly containing routing protocol data and a data frame sequence number without containing data contents based on a routing protocol of the received data frame in a case where the data frame from the network link port is a data frame which is not registered and a destination switch ID is a local switch ID, and the routing decision unit routes the blocking packet to a network link port direction opposite to the network link port which receives the data frame.

4. The lossless ring network switch of claim 3, wherein the routing decision unit determines whether the received data frame has been registered based on a source lossless ring network switch ID and a data sequence number included in the received data frame.

5. A lossless self-healing ring network comprising a plurality of lossless ring network switches according to any one of claims 1 to 4.

6. A lossless looped network data communication method comprises the following steps:

a first data frame sent by a first user equipment from a user equipment port of a first lossless ring network switch through a first switching logic unit;

a first data recombination unit of a first lossless ring network switch acquires a destination lossless ring network switch ID corresponding to a destination MAC by adopting a Hash algorithm based on a destination MAC address in a first data frame and a source lossless ring network switch ID table in the first lossless ring network switch, adds a routing protocol containing the acquired destination lossless ring network switch ID, the first lossless ring network switch ID and a data frame serial number generated based on the first lossless ring network switch ID for the first data frame, and copies the first data frame after the protocol is added;

a first routing decision unit of a first lossless loop network switch routes the first data frame and a copy thereof to a pair of network link port directions of the first lossless loop network switch respectively;

when a second ID learning unit of at least one second lossless looped network switch receives a first data frame from first user equipment through one of the paired network link ports, based on a source address learning mechanism, learning a first lossless looped network switch ID contained in a routing protocol of the first data frame and forming a source lossless looped network switch ID table in a looped network; and

the second routing decision unit of the at least one second lossless ring network switch, upon receiving the first data frame from the first user equipment through one of its paired network link ports, routes the first data frame, which is included in the routing protocol and whose destination switch ID is not the local switch ID and whose data frame sequence number is not registered, only to the direction of the network link port opposite to the network link port that received the first data frame, routes the first data frame, which is included in the routing protocol and whose destination lossless ring network switch ID is the second lossless ring network switch ID and whose data frame sequence number is not registered, to the direction of the second data reassembly unit of the second lossless ring network switch, and discards the first data frame, whose frame sequence number has been registered.

7. The lossless ring network data communication method according to claim 6, further comprising:

when the second routing decision unit routes the first data frame to the second data recombination unit, the second data recombination unit strips the routing protocol added in the first data frame and then sends the routing protocol to the second switching logic unit of the second lossless ring network switch.

8. The lossless ring network data communication method according to claim 6 or 7, further comprising:

as the second routing decision unit routes the first data frame with the destination lossless ring network switch ID as the second lossless ring network switch ID to the direction of the second data reorganization unit, the second data reorganization unit reorganizes a blocking packet mainly containing routing protocol data and a data frame sequence number but not containing substantial data content based on the routing protocol of the received first data frame, and routes the blocking packet to the direction of the network link port opposite to the network link port receiving the first data frame.

9. The lossless ring network data communication method according to claim 8, further comprising:

the second ID learning unit registers the data frame sequence number of the first data frame in the data frame sequence number registration table in association with the first lossless network switch ID when the data frame sequence number of the first data frame is not registered.