WO2018048026A1

WO2018048026A1 - Ethernet frame-based traffic control method

Info

Publication number: WO2018048026A1
Application number: PCT/KR2016/014043
Authority: WO
Inventors: 박창운; 오휘명; 최성수
Original assignee: 한국전기연구원
Priority date: 2016-09-08
Filing date: 2016-12-01
Publication date: 2018-03-15
Also published as: KR20180028291A

Abstract

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

Description

Ethernet frame based traffic control method

The present invention relates to a traffic control method based on Ethernet frame. More specifically, the high-availability seamless redundancy (HSR) based network, which is one of the high availability network protocols for the industrial communication network, may be generated when the external network based on the STP / RSTP (Spanning-Tree Protocol / Rapid STP) is connected. The present invention relates to an Ethernet frame-based traffic control method that can solve a broadcast storm or a traffic congestion problem.

Recently, with the development of IT and information and communication technology, the industry is digitizing rapidly, and accordingly, a new concept of communication technology has been developed to secure the connectivity between each network and to facilitate the processing of the increasing amount of data between each network. Necessity is on the rise.

In line with this trend, High-Availability Seamless Redundancy (HSR), one of the high-availability network protocols for industrial communication networks, which is recently being expanded to digital substations, refers to Ethernet-based network technology according to IEC 62439. In the case of the network, a single traffic is duplicated and transmitted based on the ring topology, and thus, a high reliability of the transmitted data can be ensured.

In addition, the HSR-based network has the advantage that it can be easily connected to existing networks through RedBox (Redundancy Box), but STP / RSTP (Spanning-Tree Protocol / Rapid) among the existing networks. When connected with an STP-based network, there is a problem that the possibility of a broadcast storm or a traffic congestion problem becomes very high depending on the situation.

The present invention has been made to solve the above problems and after analyzing the Ethernet frame transmitted and received Ethernet frame having a predetermined structure for the purpose of network management or traffic control a plurality of nodes constituting the HSR network according to the analysis result A broadcast storm or traffic congestion problem in the HSR-based network itself without relying on an external network's protocol by changing the state of the port that received the Ethernet frame or forwarding the received Ethernet frame to another port in the HSR network. An object of the present invention is to provide an Ethernet frame-based traffic control method that can solve the problem.

According to a preferred embodiment of the present invention, an Ethernet frame-based traffic control method includes: (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 and changes the state of a port receiving the Ethernet frame according to the analysis result, or other nodes configuring the received Ethernet frame in the network. It characterized in that it comprises the step of delivering.

In addition, in step (a), the one node may update the prestored transmission number information for each Ethernet frame transmission having the predetermined structure.

In addition, the step (a) is (a1) the one node transmits the Ethernet frame having the predetermined structure, (a2) the one node to increase the bit value corresponding to the transmission number information by 1 (A3) the one node confirms a bit value corresponding to the transmission number information, and (a4) the one node maintains a bit value corresponding to the transmission number information according to the confirmation result. Or changing the bit value to an arbitrary bit value.

In addition, the step (c) is (c1) the one node confirms whether the received Ethernet frame is an Ethernet frame having the predetermined structure, (c2) the result of the check that the received Ethernet frame is the pre- When the node does not have an Ethernet frame having a determined structure, checking the state of the port on which the one node receives the inner frame, and (c3) the node deleting the received Ethernet frame according to the checking result; Or it may include the step of delivering to the outside.

In addition, the step (c) is (c1) the one node confirms whether the received Ethernet frame is an Ethernet frame having the predetermined structure, (c2) the result of the check that the received Ethernet frame is the pre- In the case of the Ethernet frame having the determined structure, confirming whether the one node matches the source address information of the received Ethernet frame with the MAC address information of the one node, (c3) ) If the source address information of the received Ethernet frame and the MAC address information do not coincide with each other as a result of the checking, the one node sets the bit value corresponding to the transmission count information to 0, and (c4) the one The node may include deleting the received Ethernet frame.

In addition, the step (c) is (c1) the one node confirms whether the received Ethernet frame is an Ethernet frame having the predetermined structure, (c2) the result of the check that the received Ethernet frame is the pre- In the case of the Ethernet frame having the determined structure, confirming whether the one node matches the source address information of the received Ethernet frame with the MAC address information of the one node, (c3) (C4) the one node checking the state of the port when the source address information of the received Ethernet frame and the MAC address information match, and (c4) the received Ethernet frame according to the verification result. Deleting or forwarding to other nodes constituting 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 Doubly Attached Node implementing HSR (DANH) or a Redundancy Box (RedBox).

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

According to a preferred embodiment of the present invention, an Ethernet frame-based traffic control method includes: (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) changing, by the one node, the state of the port receiving the Ethernet frame according to the analysis result after analyzing the received Ethernet frame.

According to the present invention, HSR-based network does not depend on the protocol of the external network by changing the state of the port that receives the Ethernet frame by periodic Ethernet frame transmission and analysis of the received Ethernet frame at the node constituting the network. The network itself has the effect of solving the broadcast storm or traffic congestion problem.

1 is a flowchart illustrating an Ethernet frame based traffic control method according to an embodiment of the present invention;

2 and 3 schematically show a network structure to which an Ethernet frame-based traffic control method according to an embodiment of the present invention is applied;

4 is a detailed flowchart of S100 of FIG. 1;

5 is a view schematically showing the node configuration of FIGS. 2 and 3;

6 is a detailed flowchart for S300 of FIG. 1, and

FIG. 7 is a conceptual diagram of the operation of the port controller of FIG. 6.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in describing the elements of each drawing, it should be noted that the same elements are designated by the same reference numerals as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical idea of the present invention may be implemented by those skilled in the art without being limited or limited thereto.

1 is a flow chart of an Ethernet frame-based traffic control method according to a preferred embodiment of the present invention, Figures 2 and 3 schematically shows a network structure to which the Ethernet frame-based traffic control method according to an embodiment of the present invention is applied One drawing.

1 to 3, one node among a plurality of

nodes

10, 20, 30, 40, 50, 60, 70, 80, 900, and 100 constituting the network 1 in S100 is network management or traffic. Transmit Ethernet frames with a predetermined structure for control purposes.

In this case, in S100, the one node may update the transmission count information stored in a separate storage space included in the one node every time Ethernet frame transmission having the predetermined structure, and the transmission count information is a predetermined size. May be implemented in units of bytes (eg, 4 bytes).

In addition, in S100, the network 1 may be a network having a ring topology based on high-availability seamless redundancy (HSR), which is one of high availability network protocols according to IEC 62439, as shown in FIG. A node of the node may have two identical physical address interfaces (that is, two input / output ports for bidirectionally transmitting the same Ethernet frame) or two attached I / O ports and an external network. It may be a RedBox (Redundancy Box) having a separate input / output port (that is, a port for interlink) for connection.

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, 30), and the two RedBoxes 20 and 30 may be connected to an external network 110. The external network 110 may be a STP / RSTP (Spanning-Tree Protocol / Rapid STP). It may be a network based.

In addition, the Ethernet frame having the predetermined structure has 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 a detailed process of S100 will be described later with reference to FIG. 4.

In S200, the one node receives the Ethernet frame, and in S300, the one node analyzes the received Ethernet frame and is included in the one node according to the analysis result, and the state of the port that receives the Ethernet frame. Termination is performed by changing the value or by passing the received Ethernet frame to other nodes constituting the network.

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

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

In step S130, the one node increases the bit value corresponding to the above-described transmission number information by 1 for the transmission number count of the Ethernet frame having the predetermined structure.

After the one node checks the bit value corresponding to the transmission number information in S150, if the bit value is not 0 in S170, after the termination is completed, S200 may be performed. If 0, the node may terminate after changing a bit value corresponding to the transmission number information to an arbitrary value in S190 and S200 may be performed.

As such, when the bit value is 0 in S170, the reason why the one node changes the bit value to an arbitrary value in S190 is before performing S300 (that is, before analyzing the received Ethernet frame). ), So that the bit value corresponding to the transmission number information does not become 0, which will be described in more detail with reference to FIG.

5 is a diagram schematically illustrating the node structure of FIGS. 2 and 3, FIG. 6 is a detailed flowchart of S300 of FIG. 1, and FIG. 7 is a reference diagram of the operation of the port controller of FIG. 5.

First, FIG. 5 schematically shows the structure of Node 2 20, which is a RedBox among the plurality of

nodes

10, 20, 30, 40, 50, 60, 70, 80, 90, and 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 connecting to an external network (that is, an interlink). Port), and the port controller 27 analyzes the Ethernet frame 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 through the first port 21 and the second port 33 to other nodes constituting the network (e.g., Node1 (included in network 1 and adjacent to Node2 20); 10) and to ports included in Node3 (30), respectively.

In this case, the port controller 27 may change the state of the third port 25 to a 'blocking', 'learning', and 'forwarding' state, which is illustrated in FIGS. 6 and 7. Reference to this will be made in more detail.

In addition, the information storage unit 29 stores information on the number of transmissions that are updated when the Ethernet frame having the predetermined structure as described above with reference to FIGS. 1 to 3.

6, in operation S310, it is checked whether an Ethernet frame received by one node is an Ethernet frame having a predetermined structure.

In this case, in S310, the one node may determine whether the received Ethernet frame is an Ethernet frame having the predetermined structure in various ways. For example, the Ethernet frame having the predetermined structure is a supervision frame. In this case, the one node (that is, the port control unit 27 of the one node) checks a destination address of the supervision frame (that is, the supervision frame according to IEC 62439-3). Since the destination address is represented in the form of '01 -15-4E-00-01-XX ', it is possible to check whether the received Ethernet frame is a supervision frame by checking the same).

When the received Ethernet frame is an Ethernet frame having the predetermined structure as a result of the check in S310, S320 and S330 are performed. Accordingly, the one node may be configured to obtain source address information of the received Ethernet frame. It is checked whether or not the MAC address information of the one node matches.

In addition, when the received Ethernet frame is not an Ethernet frame having a predetermined structure as a result of the check in S310 (that is, when the received Ethernet frame is a general Ethernet frame), S320 and S350 are performed. The one node may check the state of its own port (that is, the port receiving the Ethernet frame) and then perform the following steps according to the check result.

When the source address information of the received Ethernet frame and the MAC address information of the one node coincide with each other as a result of checking in S330 (that is, the predetermined structure transmitted by the one node itself is the received Ethernet frame). S380 and S390 are performed. Accordingly, the one node changes the bit value corresponding to the transmission number information stored in the information storage unit 29 to 0, as shown in FIG. 7. As described above, the state of the port receiving the Ethernet frame is changed to 'blocking', and the termination is performed after deleting the received Ethernet frame.

In this case, the above operations (S310, S320, S330, S340, S380, and S390) are performed in the one node, because the Ethernet frame received by the one node is Node 2 (of network 1). 20) and the node 3 (30) and the external network 110 through the path composed of SW 2 114 and SW 1 (112) to determine that the node 2 (20) of the port receiving the Ethernet frame By changing the state to 'blocking' and dropping the received Ethernet frame, it is possible to prevent the broadcast storm due to the path formation.

In addition, if the source address information of the received Ethernet frame and the MAC address information of the one node does not match (that is, the received Ethernet frame has a predetermined structure not transmitted by itself as a result of the check in S330). S340 and S350 are performed, so that one node checks the state of its own port (that is, the port that received the Ethernet frame).

When the port state of receiving the Ethernet frame is 'blocked' as a result of the checking, S355 and S390 are performed. Accordingly, the one node terminates after deleting the received Ethernet frame.

In this case, the reason that the above operation (S350, S355, S390) is performed in the one node, the one node has a predetermined structure that the received Ethernet frame is a general Ethernet frame or does not transmit itself Even in the case of an Ethernet frame, when the state of the port receiving the Ethernet frame is 'blocked', the received Ethernet frame is deleted to prevent excessive traffic from being caused by data flowing through an external network. .

In addition, if the port state receiving the Ethernet frame is not 'blocking' as a result of the checking, in step S360, the one node checks whether the port state receiving the Ethernet frame is 'learning' and receives the Ethernet frame port. If the status is not 'learning', the single node duplicates the received Ethernet frame and transmits the received Ethernet frame to other nodes constituting the network 1 through the first port 21 and the second port 23 in S270. Then exit.

In this case, the reason that the above operation (S355, S360, S370) is performed in the one node, the one node has a predetermined structure that the received Ethernet frame is a general Ethernet frame or does not transmit itself It is an Ethernet frame, and since the state of the port that receives the Ethernet frame is not 'blocked' or 'learned', it is determined that the received Ethernet frame is not a problem, and thus the network 1 is configured with the received Ethernet frame. To pass it on to other nodes.

In addition, when the port state in which the Ethernet frame is received is 'learning' as a result of the check in S360, a bit value corresponding to the transmission number information stored in the information storage unit 29 is stored in the information storage unit 29 in S365. If the bit value is equal to or less than a random value, the node terminates after dropping the received Ethernet frame in S390. When the bit value is greater than a random value, the terminal is terminated. The node duplicates the received Ethernet frame and transmits the same through the first port 21 and the second port 23 to other nodes constituting the network 1, and then terminates.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Therefore, the embodiments described in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

(a) transmitting, by one of the plurality of nodes constituting the network, an Ethernet frame having a predetermined structure;

(b) the one node receiving an Ethernet frame; And

(c) the one node analyzes the received Ethernet frame and then changes the state of the port that received the Ethernet frame according to the analysis result or transfers the received Ethernet frame to other nodes constituting the network. Ethernet frame-based traffic control method comprising the step of transmitting.
The method of claim 1,

In the step (a),

The one node updates the transmission number information stored in advance for each Ethernet frame transmission having the predetermined structure, characterized in that the Ethernet frame-based traffic control method.
The method of claim 2,

In step (a),

(a1) the one node transmitting an Ethernet frame having the predetermined structure;

(a2) the one node increasing the bit value corresponding to the transmission count information by one;

(a3) checking, by the one node, a bit value corresponding to the transmission number information; And

(a4) wherein the one node maintains the bit value corresponding to the transmission number information or changes the bit value to an arbitrary bit value according to the check result. Traffic control method.
The method of claim 1,

Step (c) is.

(c1) the one node checking whether the received Ethernet frame is an Ethernet frame having the predetermined structure;

(c2) if the received Ethernet frame is not an Ethernet frame having the predetermined structure, ascertaining the state of a port on which the one node receives the Ethernet frame; And

and (c3) the one node deleting the received Ethernet frame or forwarding the received Ethernet frame to other nodes constituting the network according to the checking result.
The method of claim 2,

In step (c),

(c1) the one node checking whether the received Ethernet frame is an Ethernet frame having the predetermined structure;

(c2) if the received Ethernet frame is an Ethernet frame having the predetermined structure as a result of the checking, the one node is the source address information of the received Ethernet frame and the MAC address of the one node; checking whether or not the information matches address;

(c3) if the source address information of the received Ethernet frame and the MAC address information match, the one node sets the bit value corresponding to the transmission number information to 0 as a result of the checking; And

(c4) the one node deleting the received Ethernet frame.
The method of claim 1,

In step (c),

(c1) the one node checking whether the received Ethernet frame is an Ethernet frame having the predetermined structure;

(c2) if the received Ethernet frame is an Ethernet frame having the predetermined structure as a result of the checking, the one node is the source address information of the received Ethernet frame and the MAC address of the one node; checking whether or not the information matches address;

(c3) checking, by the one node, the state of the port when the received Ethernet frame source address information and the MAC address information do not match; And

and (c4) deleting the received Ethernet frame or forwarding the received Ethernet frame to other nodes constituting the network according to the verification result.
The method of claim 1,

The network is an Ethernet frame-based traffic control method, characterized in that to operate based on the High-availability Seamless Redundancy (HSR) protocol.
The method of claim 1,

The one node is a Doubly Attached Node implementing HSR (DANH) or RedBox (Redundancy Box) characterized in that the Ethernet frame-based traffic control method.
The method of claim 1,

The Ethernet frame having the predetermined structure is a Ethernet frame-based traffic control method, characterized in that the supervision frame (Supervision frame).
(a) transmitting, by one of the plurality of nodes constituting the network, an Ethernet frame having a predetermined structure;

(b) the one node receiving an Ethernet frame; And

(c) the one node analyzing the received Ethernet frame and changing the state of a port that has received the Ethernet frame according to the analysis result.