KR20180028291A - Traffic control method based on ethernet frame - Google Patents

Abstract

The present invention relates to a traffic control method based on an Ethernet frame, and more specifically, to a traffic control method based on an Ethernet frame, which is capable of solving a broadcast storm or traffic congestion problem which can occur when a high-availability seamless redundancy (HSR)-based network that is one of highly available network protocols for industrial communications networks is connected to a spanning-tree protocol (STP) / rapid STP (RSTP)-based external network. The traffic control method based on an Ethernet frame comprises: (a) a step in which one node among a plurality of nodes forming a network transmits an Ethernet frame having a predetermined structure; (b) a step in which the one node receives an Ethernet frame; and (c) a step in which the one node analyzes the received Ethernet frame to change the state of a port that is included in the one node and has received the Ethernet frame or to transmit the received Ethernet frame to other nodes forming the network according to the analysis result.

Description

[0001] The present invention relates to a traffic control method based on Ethernet frame,

The present invention relates to a traffic control method based on an Ethernet frame. In particular, when a high-availability seamless redundancy (HSR) -based network, which is one of high availability network protocols for industrial communication networks, is associated with an external network based on STP / RSTP (Spanning-Tree Protocol / Rapid STP) To an Ethernet frame-based traffic control method capable of solving a broadcast storm or traffic congestion problem.

Recently, with the development of IT and ICT technologies, industry is rapidly digitizing, and accordingly, a new concept of communication technology for securing the interconnection between each network and facilitating processing of a large amount of data between each network There is a growing need.

HSR (High-Availability Seamless Redundancy), which is one of high-availability network protocols for industrial communication networks, has recently been introduced in digital substations to meet these trends. It means Ethernet-based network technology according to IEC 62439, The network has a merit of securing high reliability of transmitted data by duplicating and transmitting one traffic based on the ring topology type.

In addition, HSR-based networks having the above characteristics have the advantage of being able to easily link with existing networks through RedBox (Redundancy Box). However, in the existing network, STP / Spanning Tree Protocol / Rapid STP) based networks, there is a problem that the possibility of a broadcast storm or a traffic congestion problem becomes very high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an Ethernet frame transmission method and an Ethernet frame transmission method in which a plurality of nodes constituting an HSR network transmit and receive Ethernet frames having a predetermined structure for network management or traffic control, The HSR-based network itself does not depend on the protocol of the external network by changing the state of the port receiving the Ethernet frame or transmitting the received Ethernet frame to another port in the HSR network, And to provide an Ethernet frame-based traffic control method capable of solving the above problem.

According to an aspect of the present invention, there is provided an Ethernet frame-based traffic control method including: (a) transmitting an Ethernet frame having a predetermined structure by one of a plurality of nodes constituting a network; (b) the one node receiving an Ethernet frame; And (c) after the one node analyzes the received Ethernet frame, changes the state of the port included in the one node and received the Ethernet frame according to the analysis result, or changes the state of the received Ethernet frame To other nodes constituting the network.

In addition, in step (a), the one node may update the transmission number information previously stored every time the Ethernet frame having the predetermined structure is transmitted.

The step (a) further comprises: (a1) transmitting the Ethernet frame having the predetermined structure by the one node, (a2) incrementing the bit value corresponding to the transmission number information by one (A3) the one node checks a bit value corresponding to the transmission number information, and (a4) the one node keeps the bit value corresponding to the transmission number information as it is Or changing the bit value to an arbitrary bit value.

The step (c) includes the steps of (c1) confirming whether the received Ethernet frame is the Ethernet frame having the predetermined structure, (c2) confirming whether the received Ethernet frame is the Ethernet frame having the predetermined structure The method of claim 1, further comprising the step of: (c3) if the node is not the Ethernet frame having the determined structure, checking whether the one node has received the Ethernet frame, Or outwardly.

The step (c) includes the steps of (c1) confirming whether the received Ethernet frame is the Ethernet frame having the predetermined structure, (c2) confirming whether the received Ethernet frame is the Ethernet frame having the predetermined structure Determining whether the source address information of the received Ethernet frame matches the MAC address information of the one node in the case of the Ethernet frame having the determined structure; If the source address information and the MAC address information of the received Ethernet frame coincide with each other, the one node sets the bit value corresponding to the transmission number information to 0, and (c4) And deleting the received Ethernet frame.

The step (c) includes the steps of (c1) confirming whether the received Ethernet frame is the Ethernet frame having the predetermined structure, (c2) confirming whether the received Ethernet frame is the Ethernet frame having the predetermined structure Determining whether the source address information of the received Ethernet frame matches the MAC address information of the one node in the case of the Ethernet frame having the determined structure; If the source address information and the MAC address information of the received Ethernet frame coincide with each other, the one node checks the status of the port, and (c4) Or to other nodes that make up the network.

In addition, the network may operate based on a High-availability Seamless Redundancy (HSR) protocol.

In addition, the one node may be a Double Attached Node (HSR) or a Redundancy Box (DAB).

In addition, the Ethernet frame having the predetermined structure may be a Supervision frame.

According to the present invention, by periodically transmitting an Ethernet frame in an HSR-based network and analyzing a received Ethernet frame, the port state of the received Ethernet frame is changed, and HSR Based network itself has the effect of solving the problem of broadcast storm or traffic congestion.

FIG. 1 is a flowchart illustrating a method of controlling traffic based on an Ethernet frame according to a preferred embodiment of the present invention. FIG.
2 and 3 are views schematically showing a network structure to which an Ethernet frame-based traffic control method according to a preferred embodiment of the present invention is applied;
4 is a detailed flowchart of S100 of FIG. 1,
Figure 5 schematically shows the node configuration of Figures 2 and 3,
6 is a detailed flowchart of S300 in Fig. 1, and Fig.
7 is a conceptual diagram of the port control unit operation of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in describing the constituent elements of each drawing, it should be noted that the same constituent elements are denoted by the same reference numerals whenever possible, even if they are displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Further, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be practiced by those skilled in the art.

FIG. 1 is a flowchart of an Ethernet frame-based traffic control method according to a preferred embodiment of the present invention. FIGS. 2 and 3 schematically show a network structure to which an Ethernet frame- based traffic control method according to a preferred embodiment of the present invention is applied. Fig.

1 to 3, it is assumed that one of the nodes 10, 20, 30, 40, 50, 60, 70, 80, 900, 100 constituting the network 1 in S100 performs network management or traffic And transmits an Ethernet frame having a predetermined structure for the purpose of control.

At this time, in step S100, the one node may update the transmission number information stored in a separate storage space included in the one node each time the Ethernet frame having the predetermined structure is transmitted, and the transmission number information may be a predetermined size (E.g., 4 bytes).

In step S100, the network 1 may be a ring topology type network based on HSR (High-availability Seamless Redundancy), which is one of high availability network protocols according to IEC 62439 as shown in FIG. 2, (Doubly Attached Node Implementing HSR) having two physical address interfaces (that is, having two input / output ports for bidirectional transmission of the same Ethernet frame) or two input / output ports and an external network (Redundancy Box) having a separate input / output port for connection (i. E., A port for interlinking).

For example, referring to FIG. 3, a network 1 to which an Ethernet frame-based traffic control method of the present invention is applied includes eight DANHs 10, 40, 50, 60, 70, 80, 90, 100 and two RedBoxes 20 and 30 and the two RedBoxes 20 and 30 may be connected to the external network 110. The external network 110 may include a Spanning-Tree Protocol / Rapid STP (STP / RSTP) Based network.

In addition, the Ethernet frame having the predetermined structure may have a structure according to IEC 62439-3, and may be a supervision frame, which is an Ethernet frame periodically transmitted from each node for network monitoring, The Ethernet frame having the structure is not limited to the supervision frame, and the detailed procedure of S100 will be described later with reference to FIG.

In step S200, the one node receives the Ethernet frame. In step S300, the one node analyzes the received Ethernet frame, and according to the analysis result, the state of the port included in the one node and the Ethernet frame received Or if the received Ethernet frame is transmitted to other nodes constituting the network, the termination is performed.

At this time, the detailed configuration of S300 will be described later with reference to Fig.

FIG. 4 is a detailed flowchart of S100 of FIG. 1. Referring to FIG. 4, in step S110, the one node transmits an Ethernet frame having the predetermined structure.

In step S130, the one node increments the bit value corresponding to the transmission number information by one for the number of transmissions of the Ethernet frame having the predetermined structure.

In step S150, the one node confirms the bit value corresponding to the transmission number information. If it is determined in step S170 that the bit value is not 0, S200 may be performed after completion of the bit value. In step S170, 0, the one node changes the bit value corresponding to the transmission number information to an arbitrary value in step S190, and then terminates and the step S200 can be performed.

If the bit value is 0 in step S170, the reason why the one node changes the bit value to an arbitrary value in step S190 is that before the execution of S300 (i.e., before analysis of the received Ethernet frame ) In order to prevent the bit value corresponding to the transmission number information from becoming 0, which will be described in more detail with reference to FIG.

FIG. 5 schematically illustrates the node structure of FIGS. 2 and 3, FIG. 6 is a detailed flow chart of S300 of FIG. 1, and FIG. 7 is a reference diagram of the port control operation of FIG.

5 schematically shows the structure of a Node 2 20, which is a RedBox among the plurality of nodes 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 shown in FIGS. Referring to FIG. 5, the Node 2 20 includes a first port 21, a second port 23, a third port 25, a port control unit 27, and an information storage unit 29 do.

The first port 21 and the second port 23 are input / output ports for bidirectional data transmission according to the HSR, and the third port 25 serves as an interlink for connection with an external network And the port control unit 27 analyzes the Ethernet frame received through the third port 25 to change the state of the third port 25 or deletes the received Ethernet frame Or the received Ethernet frame to other nodes constituting the network through the first port 21 and the second port 33 (e.g., Node1 included in the network 1 and adjacent to the Node2 20) 10) and the Node 3 (30).

At this time, the port control unit 27 can change the state of the third port 25 to 'blocking', 'learning', and 'forwarding' Will be described in more detail with reference to FIG.

The information storage unit 29 stores the number of transmission times updated when the Ethernet frame having the predetermined structure described above with reference to FIGS. 1 to 3 is updated.

Referring to FIG. 6, in step S310, it is confirmed whether the Ethernet frame received by one node is an Ethernet frame having a predetermined structure.

At this time, in S310, the one node can confirm whether the received Ethernet frame is the Ethernet frame having the predetermined structure in various ways. For example, if the Ethernet frame having the predetermined structure is a supervision frame, , The one node (that is, the port control unit 27 of the one node) confirms the destination address of the supervision frame (that is, the supervision frame according to IEC 62439-3) 01 -15-4E-00-01-XX ', so that it is possible to confirm whether or not the received Ethernet frame is a super vision frame in a manner of confirming the destination address).

If it is determined in step S310 that the received Ethernet frame is the Ethernet frame having the predetermined structure, steps S320 and S330 are performed. Accordingly, the one node transmits the source address information of the received Ethernet frame And checks whether the MAC address information of the one node matches.

If it is determined in step S310 that the received Ethernet frame is not an Ethernet frame having a predetermined structure (in other words, if the received Ethernet frame is a general Ethernet frame), steps S320 and S350 are performed. The one node can confirm the status of its own port (that is, the port receiving the Ethernet frame), and perform the following steps according to the confirmation result.

If it is determined in step S330 that the source address information of the received Ethernet frame matches the MAC address information of the one node (in other words, if the received Ethernet frame is the predetermined structure S380 and S390 are performed, the one node changes the bit value corresponding to the transmission number information stored in the information storage unit 29 to 0, , The status of the port receiving the Ethernet frame is changed to 'blocked', and the received Ethernet frame is deleted and then terminated.

The reason why the one node performs the above operations (S310, S320, S330, S340, S380, and S390) is that the one Ethernet node receives the Ethernet frame from the Node 2 20 and the Node 3 30 and the SW 2 114 and the SW 1 112 of the external network 110 to the Node 2 20, To the 'blocked' state and drop the received Ethernet frame, thereby preventing a broadcast storm according to the path formation.

If it is determined in step S330 that the source address information of the received Ethernet frame does not match the MAC address information of the one node (in other words, the received Ethernet frame has a predetermined structure S340 and S350 are performed, so that the one node confirms the status of its own port (that is, the port that received the Ethernet frame).

If it is determined that the port status of the Ethernet frame received is 'blocked', steps S355 and S390 are performed. Accordingly, the one node deletes the received Ethernet frame and terminates the process.

At this time, the reason why the above-mentioned operations (S350, S355, S390) are performed at the one node is that the one Ethernet node receives the Ethernet frame as a general Ethernet frame or has a predetermined structure Even in the case of an Ethernet frame, if the port status of the Ethernet frame received is 'blocked', the received Ethernet frame is deleted, thereby preventing excessive traffic from being caused by data flowing through the external network .

If it is determined in step S360 that the port status of the Ethernet frame is not 'blocked', the one node determines in step S360 whether the port status of the Ethernet frame received is 'learning' If the state is not 'learning', the one node duplicates the received Ethernet frame in step S270 and transmits it to other nodes constituting the network 1 through the first port 21 and the second port 23 And then termination is done.

At this time, the reason why the above-described operations (S355, S360, and S370) are performed at the one node is that the Ethernet frame received by the one node is a general Ethernet frame or has a predetermined structure Ethernet frame, and the port state in which the Ethernet frame is received is also not 'blocking' or 'learning', it is determined that the received Ethernet frame is not a problem, and the received Ethernet frame is configured as a network To other nodes.

If it is determined in step S360 that the port status of the Ethernet frame received is 'learning', in step S365, if the bit value corresponding to the transmission number information stored in the information storage unit 29 of the one node is an arbitrary value If the bit value is less than or equal to a certain value, the one node drops the received Ethernet frame in step S390 and terminates. If the bit value exceeds a certain value, the process proceeds to step S370. In step S370, The node duplicates the received Ethernet frame and transmits it to the other nodes constituting the network 1 through the first port 21 and the second port 23 and then terminates.

It will be apparent to those skilled in the art that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. will be. Therefore, the embodiments described in the present invention are intended to illustrate rather than limit the technical spirit of the present invention, and the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

(1): network
(10, 20, 30, 40, 50, 60, 70, 80, 90, 100)
(21): first port (23): second port
(25): third port (27): port control section
(29): an information storage unit

Claims (9)

(a) transmitting an Ethernet frame having a predetermined structure by one of a plurality of nodes constituting a network;
(b) the one node receiving an Ethernet frame; And
(c) the one node analyzes the received Ethernet frame, and changes the state of a port included in the one node and received the Ethernet frame according to the analysis result, or changes the state of the received Ethernet frame to the network To the other nodes constituting the Ethernet frame. The method according to claim 1,
In the step (a)
Wherein the one node updates the transmission number information stored in advance every time the Ethernet frame having the predetermined structure is transmitted. 3. The method of claim 2,
The step (a)
(a1) transmitting, by the one node, an Ethernet frame having the predetermined structure;
(a2) incrementing a bit value corresponding to the transmission number information by 1 by the one node;
(a3) confirming a bit value corresponding to the transmission number information by the one node; And
(a4) the one node retains the bit value corresponding to the transmission number information or changes the bit value to an arbitrary bit value according to the confirmation result. Traffic control method. The method according to claim 1,
The step (c) comprises:
(c1) confirming that the one node is the Ethernet frame having the predetermined structure;
(c2) if the received Ethernet frame is not the Ethernet frame having the predetermined structure, checking the status of the port from which the one node received the Ethernet frame; And
and (c3) deleting the received Ethernet frame or forwarding the received Ethernet frame to other nodes constituting the network according to the result of the checking. 3. The method of claim 2,
The step (c)
(c1) confirming that the one node is the Ethernet frame having the predetermined structure;
(c2) if it is determined that the received Ethernet frame is the Ethernet frame having the predetermined structure, the one node transmits the source address information of the received Ethernet frame and the MAC address address) information of the user;
(c3) if the source address information of the received Ethernet frame matches the MAC address information, the one node sets the bit value corresponding to the transmission number information to zero; And
and (c4) the one node deleting the received Ethernet frame. The method according to claim 1,
The step (c)
(c1) confirming that the one node is the Ethernet frame having the predetermined structure;
(c2) if it is determined that the received Ethernet frame is the Ethernet frame having the predetermined structure, the one node transmits the source address information of the received Ethernet frame and the MAC address address) information of the user;
(c3) if the received Ethernet frame source address information matches the MAC address information, the one node checks the status of the port; And
(c4) deleting the received Ethernet frame or transmitting the received Ethernet frame to other nodes constituting the network according to the result of the checking. The method according to claim 1,
Wherein the network is based on a High-availability Seamless Redundancy (HSR) protocol. The method according to claim 1,
Wherein the one node is a Doubly Attached Node Implementing HSR (DANH) or a Redundancy Box (RedBox). The method according to claim 1,
Wherein the Ethernet frame having the predetermined structure is a supervision frame.

Images