JP2008245087A - Loop position specification system for eoe network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loop position specification system capable of speedily specifying the position of a loop formed on an EoE network and speedily eliminating the loop, even if a communication carrier side does not have operation authority over a terminal base associated with the loop position. <P>SOLUTION: A loop detecting device 1, once receiving a returned encapsulating test frame, decides whether the test frame is the same with the test frame having been sent and decides that a loop is formed when it is the same, and then acquires an EoE switch associated with the loop and information on a user contact destination having operation authority thereof from a transmission source address in the capsule and data stored in an EoEmac management DB2 and an EoE switch storage management DB3. The loop detecting device 1 reports the formation of the loop to the user who has operation authority, by using the information on the user contact destination to request the user to eliminate the loop. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a loop position specifying system in an EoE (MAC IN MAC) network, and more particularly, to a loop position specifying system that can quickly specify a loop position related to a network loop failure on a communication carrier side.

  Conventionally, a wide area Ethernet network using EoE (Ethernet (registered trademark) over Ethernet) technology is known. When a network is configured by combining a large number of EoE switches and non-EoE switches, if a loop in which flooding traffic continues on the network is configured due to a setting error, etc., normal communication will occur in various ways as described below. There is a risk that the network will be taken down.

  (1) The network's transfer capacity is used up by allowing the flooding traffic rotating in the loop to continue to grow until the network's transmission bandwidth is used up.

  (2) The learning contents of the MAC address learning table are rewritten and destroyed by flooding traffic that rotates in the loop.

  (3) The flooding traffic that rotates in the loop adversely affects the end node terminal equipment.

  From the above, when a loop occurs in the network, it is necessary to quickly identify the loop position and eliminate the loop at an early stage.

As a prior art related to the present invention, in a network in which a plurality of switching hubs having an EoE function are connected, in order to solve the problem that communication cannot be performed when a failure occurs in a certain line on the network, An invention in which re-learning of the switching hub is promoted when the connection state changes is disclosed in Patent Document 1 below.
JP 2005-175591 A

  According to the above-described prior art, it is possible to avoid a circuit failure by relearning a switching hub of a route in which no failure has occurred in a port. However, it is possible to identify a loop position generated in a network and to quickly execute the loop. However, there was a problem that no consideration was given to solving the problem.

  The applicant has filed a patent application (Japanese Patent Application No. 2006-56217) as an invention that addresses this problem. The invention of this application multicasts or broadcasts a test frame from a loop test device via a MAC bridging device (core switch, edge switch, etc.), and when the test frame returns to the test device, the loop occurrence direction determination device When the source MAC address of the returned test frame is learned in a port that is not logically closest to the test apparatus, it is determined that there is a loop in that direction. In the invention of this application, although it is possible to determine the loop occurrence direction for a system that performs normal Ethernet (registered trademark) bridging, it is necessary to read the learning table of the switch in order to perform the determination. For this reason, when there are many target switches, there is a demerit that it takes time until the determination, and there is a problem that the determination cannot be performed if there is no means for reading the learning table of the switch.

  The present invention has been made in view of the above-described prior art, and an object of the present invention is to identify the loop position generated in the EoE network or the MAC IN MAC network without reading the learning table of the switch. It is an object of the present invention to provide a loop positioning system that can be quickly performed. It is another object of the present invention to provide a loop position specifying system that can quickly eliminate a loop even if the operation authority of the terminal base related to the loop position is not on the communication carrier side.

  In order to achieve the above object, the present invention provides an EoE network or MAC IN MAC network having at least a core switch and a plurality of EoE switches or MAC IN MAC switches (hereinafter referred to as EoE switches) connected thereto. (Hereinafter referred to as the EoE network), a loop location specifying system, a test apparatus for sending an encapsulated test frame for checking whether or not a loop has occurred to the EoE network, and a loop located on the EoE network and returned by the loop. And an EoE switch for returning an encapsulated test frame formed by adding a capsule part having a transmission source address including a port number as its own address to the test frame. When the test frame matches the test frame of the returned encapsulated test frame Thereby determining that but have occurred, is characterized in that so as to identify EoE switch and its port number undergoing loop.

  Further, the present invention provides a first database for storing data for comparing the source address connected to the test apparatus and the apparatus name, and a second database for storing data for comparing the apparatus name and user contact information. And when the test apparatus determines that the loop has occurred, the test apparatus extracts a source address from the capsule portion of the returned encapsulated test frame, and stores it in the first and second databases. There is another feature in that user contact information for managing the device of the transmission source address is acquired and the user is notified of the occurrence of the loop.

  In addition, the user contact information includes another feature in that user contact information of a device that does not have an operation authority on the communication carrier side is included.

  According to the present invention, when a loop occurs in the EoE network, the loop position can be quickly identified on the communication carrier side without reading the switch learning table.

  Further, according to the present invention, data relating to SYS NAME (device name) / accommodating port number and user contact information can be acquired and databased in advance even for a device for which the communication carrier does not have the operation authority. Therefore, even when there is no operation authority on the communication carrier side, it is possible to notify the user of the terminal base that is in the loop of the occurrence of the loop and to promptly cope with the user such as closing the terminal base. become.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of an EoE network or a MAC IN MAC switch (hereinafter referred to as an EoE switch) to which the present invention is applied.

  As shown in the figure, the EoE network of this embodiment is connected to the core switch 10, a plurality of EoE switches 20, 30, 40 connected to the core switch 10, and the ports of the plurality of EoE switches. The non-EoE switch 21, 31, 41, etc. is configured, and the non-EoE switch 21 is connected to the L2 network including the L2 switches 22, 23, etc. An example is shown. Actually, the EoE switch has a plurality of ports, and a non-EoE switch is connected to the plurality of ports. In FIG. 1, one non-EoE switch is connected to the EoE switch. ing. Note that FIG. 1 only shows a simple network configuration for ease of explanation. In practice, a plurality of core switches, a core switch and one or more EoE switches, an EoE switch and one or more It is clear that non-EoE switches are connected to each other to create a complex network configuration.

  The core switch 10 is connected to a loop detection device (or test device) 1 which is a main part of the present invention. The loop detection device 1 includes an EoEmac management DB (database) 2 and an EoE switch accommodation management DB 3. It is connected.

  Here, a circuit including the EoE switch 20 and the non EoE switch 21 is referred to as VLAN 1, a circuit including the EoE switch 30 and the non EoE switch 31 is referred to as VLAN 2, and a circuit including the EoE switch 40 and the non EoE switch 41 is referred to as VLAN 3.

  Now, the loop detection device 1 is an encapsulated test (EoE encapsulation) having a destination address that is flooded and transferred on the EoE network, such as a multicast address, a broadcast address, and an unknown unicast address, periodically or when any abnormality is detected. The frame 101 is sent to the core switch 10. The core switch 10 multicasts the encapsulated test frame 101 to VLANs 1, 2, and 3.

  The encapsulated test frame 101 is composed of a test frame part a and an EoE capsule part b. As shown in FIG. 2, the test frame part a has a destination address (CDA) 51 indicating the destination of this frame, Source address (CSA) 52 indicating the source, information (CVLAN TRID) 53 indicating that this frame is a frame with VLAN tag, VLAN tag information (CVLAN TCI) 54 of the source terminal, type or data of this frame It consists of a length (Length / Type) 55, data (DATA) 56 sent in this frame, and an error check value (FCS) 57.

  On the other hand, as shown in FIG. 3, the EoE capsule part b includes a destination address (SPDA) 61 indicating the destination of the encapsulated frame, a source address (CSA) 62 indicating the source, and this frame is an EoE capsule. It consists of information (EoE TPID) 63 indicating that it is a frame, a count value (TTL) 64 decremented by 1 every time it passes through the EoE port, and reserved (rsv) 65, which are added before the test frame a.

  The encapsulation test frame 101q sent from the core switch 10 to the VLAN 2 is received by the EoE switch (# 2) 30. When the EoE switch (# 2) 30 confirms the information (EoE TPID) 63 indicating that the destination is the local EoE switch (# 2) and is an EoE capsule frame, the EoE capsule part b is removed and the test frame a Is transmitted from the non EoE switch 31 to the terminal device 32. The terminal device 32 only receives the test frame a and does not return it. Similarly, the EoE capsule part b is also removed by the EoE switch 40 from the encapsulated test frame 101r sent to the VLAN 3 from the core switch 10, and the test frame a is transmitted from the non-EoE switch 41 to the terminal device 42. 42 is received.

  Next, a case where a loop is formed in the L2 network under the EoE switch 20 of VLAN 1 will be described. The L2 network is widely used as a network for companies and carriers in order to efficiently perform high-speed and large-capacity communication. As is well known, the L2 network is a layer 2 or second layer data link layer. An L2 switch with a considerable function is configured as a relay node.

  In the encapsulated test frame 101p sent from the core switch 10 to the VLAN 1, the EoE capsule part b is removed by the EoE switch (# 1) 20, and the test frame a is sent from the non-EoE switch 21 to the L2 switch 22. However, since an ether loop is formed between the non-EoE switch 21 and the L2 switches 22 and 23 that are L2 networks under the EoE switch 20, the test frame a returns to the non-EoE switch 21 via the L2 switch 23. . The test frame a is then encapsulated by the EoE switch 20, transmitted to the core switch 10, and received by the loop detection device 1. The EoE switch 20 creates a capsule part b ′ in the format described in FIG. 3 with the destination 61 as multicast and the source address 62 as its own address, and adds the capsule part b ′ before the test frame a. The encapsulated frame 101p ′ is sent out.

  The loop detection apparatus 1 determines whether or not the test frame a of the received encapsulated frame 101p ′ matches the test frame a at the time of transmission. If they match, it is determined that a loop has occurred, and a source MAC address (CSA) 62 indicating the source is extracted from the encapsulated frame 101p '. As described above, the source MAC address is the address of the EoE switch (# 1) 20. The source MAC address (refer to FIG. 4 for a specific example, hex display) is composed of an upper address and a lower address. The upper address has the meaning of specifying the source device, and the lower address is a plurality of ports of the device. Has a meaning to identify.

  Next, the loop detection apparatus 1 accesses the EoEmac management DB 2. For example, as shown in FIG. 4, the EoEmac management DB 2 has data for comparing the source MAC address and the SYS NAME (device name) / accommodating port number. Get the SYS NAME / accommodation port number corresponding to the address.

  Subsequently, the loop detection device 1 accesses the EoE switch accommodation management DB 3. For example, as shown in FIG. 5, the EoE switch accommodation management DB 3 has data for comparing SYS NAME / accommodation port number and user contact information such as an address, a telephone number, an e-mail address, and a person in charge. Therefore, the loop detection apparatus 1 acquires user contact information corresponding to the SYS NAME / accommodating port number. Then, the loop detection device 1 notifies the user who has the authority to operate the EoE switch 20 that the loop has occurred, based on the user contact information.

  Next, an outline of the operation of the loop detection apparatus 1 will be described with reference to the flowchart of FIG. In step S1, the loop detection apparatus 1 outputs an encapsulated test frame 101 having a destination address such as a multicast address or a broadcast address periodically or when some abnormality is detected. In step S2, it is determined whether the same test frame a has returned. If it is determined that the same test frame a has returned, the process proceeds to step S3, where the source address 62 is extracted from the capsule part b '. Next, in step S4, the EoEmac management DB 2 is accessed, and the SYS NAME (device name) / accommodating port number corresponding to the source address 62 is acquired. Next, it progresses to step S5, accesses EoE switch accommodation management DB3, and acquires user contact information. In step S6, the user is notified of loop position information. The user is notified of the EoE switch causing the loop, the port number of the EoE switch, and the like.

  With the above operation, when a loop occurs in the EoE network, it is possible to promptly notify the user of the loop position and deal with it quickly. Further, according to the present invention, even when the communication carrier side does not have the operation authority because the terminal base corresponding to the loop position is under the jurisdiction of another communication carrier or provider, for example, the other communication Data related to SYS NAME (device name) / accommodation port number and user contact information can be acquired from a provider or provider and stored in a database, so that the terminal base can be operated by another carrier or provider. Even if the user belongs to the authority, it is possible to promptly deal with the occurrence of the loop by contacting the user at the terminal base.

It is a block diagram which shows the outline | summary of a structure of EoE network to which this invention is applied, and one Embodiment of this invention. It is explanatory drawing of the format of a test frame. It is explanatory drawing of the format of the capsule part of an encapsulation test frame. It is a conceptual diagram of an example of EoEmac management DB. It is a conceptual diagram of an example of EoE switch accommodation management DB. It is a flowchart which shows the operation example of a loop detection apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Loop detection apparatus, 2 ... EoEmac management DB, 3 ... EoE switch accommodation management DB, 10 ... Core switch, 20, 30, 40 ... EoE switch, 21, 31, 41 ..NonEoE switch, 22, 23 ... L2 switch.

Claims (5)

A loop location system in an EoE network or MAC IN MAC network (hereinafter referred to as an EoE network) having at least a core switch and a plurality of EoE switches or MAC IN MAC switches (hereinafter referred to as EoE switches) connected to the core switch. There,
A test device for sending an encapsulated test frame to the EoE network to inspect for the occurrence of a loop; and
An EoE switch that returns an encapsulated test frame that is formed by adding a capsule part that has a source address including a port number as its own address to a test frame that is located on the EoE network and returned by a loop. And
The test apparatus determines that a loop has occurred when the test frame at the time of transmission matches the test frame of the returned encapsulated test frame, and identifies the EoE switch that has caused the loop and its port number. A loop location system characterized by: A loop location system in an EoE network according to claim 1,
A first database connected to the test apparatus and storing data for comparing the source address, apparatus name and port number, and data for comparing the apparatus name and user contact information. 2 databases,
When the test apparatus determines that the loop has occurred, the test apparatus extracts a source address from the capsule portion of the returned encapsulated test frame, accesses the first and second databases, and transmits the source address. A loop position specifying system characterized in that user contact information for managing the device is acquired and a loop occurrence is notified to the user. A loop location system in an EoE network according to claim 1 or 2,
A loop location specifying system, wherein a destination of an encapsulated test frame transmitted from the test apparatus is a destination that is flooded and transferred on an EoE network such as a multicast address, a broadcast address, and an unknown unicast address. A loop location system in an EoE network according to claim 1 or 2,
The test apparatus sends out the encapsulated test frame periodically or when any abnormality is detected. A loop location system in an EoE network according to claim 2, comprising:
The loop location specifying system according to claim 1, wherein the user contact information includes user contact information of a device that does not have an operation authority on the communication carrier side.

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