JP3296533B2 - LAN switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a LAN switch or the like constituted by connecting devices such as a workstation and a personal computer in a star configuration, and more particularly to a technology effective when applied to an Ethernet switch. .

[0002]

2. Description of the Related Art A conventional LAN switch includes hardware (hereinafter, referred to as H / W) and control hardware (hereinafter, referred to as H / W).
C / W) processing is combined by a manufacturer's original method to realize a high-speed interface by fixing a dedicated port or by switching using a H / W switch.

Conventionally, a predetermined amount of band, for example, 1
As a countermeasure against the band shortage caused by sharing the 0 bps band among all connected users, a 10 bps band is allocated to each device between end users by using a switching technique.

Furthermore, the connection between LAN switches has been operated by eliminating the band shortage by connecting the same models and using a high-speed interface in a path where packets are concentrated to increase the transmission speed.

[0005]

SUMMARY OF THE INVENTION As a result of studying the above prior art, the present inventor has found the following problems.

[0006] With the recent trend toward multimedia, the amount of information to be transmitted tends to be enormous, and the bandwidth tends to be insufficient.

However, in the prior art, in order to solve the shortage of the bandwidth between the LAN switches, it is necessary to newly obtain a communication means having a dedicated interface and exchange it with the communication means of the existing LAN switch. There was a problem of becoming.

In addition, if a link between a plurality of ports between existing LAN switches is simply multiplexed in order to solve the band shortage at a low cost without providing a new device, a transmission packet is infinitely circulated between the LAN switches. There was a problem that would cause.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to prevent infinite circulation of a transmission packet in multiplexing links between LAN switches, and to provide a LAN switch between LAN switches without providing an expensive device. To provide a technology capable of solving the bandwidth shortage.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0011]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

[0012] In a LAN switch for switching communication packets between segments of a LAN (local area network), a multi-link information having information on each port of the LAN switch and a multiplexed port, and a reception based on the multi-link information. Means for generating a matrix table indicating to which port the received packet is to be relayed, monitoring means for storing information of the received packet, and monitoring reception of the same packet within a predetermined time,
Means for relaying or discarding received packets based on the matrix table and the monitoring means.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram for explaining a LAN switch according to an embodiment of the present invention.

In FIG. 1, reference numeral 101 denotes a LAN switch having a built-in device for multiplexing ports (hereinafter, referred to as a port bundler); 102, a port bundle processing unit;
3 is a multi-link port, 201 is a general (existing) LA
N switches are shown.

In this existing LAN switch 201, the port on the terminal side and the port on the multiplex link side are physically the same port, and the connection method and the operation method between the multiplex link port and the terminal port are switched by the port bundler. Built-in L
This is performed by defining the multilink information by the port bundler processing unit 102 of the AN switch 101.

In FIG. 1, the port bundle processing unit 10
FIG. 2 shows a connection example in which ports 6, 7, and 8 are set in the device as multiplex link information.

In the multiplex link in the port bundler of the present embodiment, the partner port to be connected can be connected to any port as long as it is the same interface, and the partner LAN switch is a multiplex link port. There is no need to recognize

Next, the configuration of the LAN switch 101 with a built-in port bundler will be described.

FIG. 2 is a diagram for explaining the configuration of the LAN switch 101 having a built-in port bundler according to the present embodiment.

As shown in FIG. 2, the LAN switch 101 with a built-in port bundler according to the present embodiment has multiple link information 301 defining an arbitrary port to be used as a multiple link port, and information from a spanning tree task to be described later. A failure monitoring task 302 for monitoring a port based on a port status report; a communication matrix processing unit 303 for providing information to a bridge control task to be described later whether to relay or discard a packet received by the multilink information 301; Spanning tree task 30 that determines a failure and recovery and reports the result to a failure monitoring task
4, a bridge control task 305 for relaying or discarding a received packet, and monitoring whether the same packet has been received within a certain period of time in order to suppress infinite circulation of the received packet, and bridging the result to a bridge. And an address monitoring processor 306 for reporting a control task.

In FIG. 2, the port bundler 102 of this embodiment comprises a communication matrix processing unit 303, an address monitoring processing unit 306, and a part of a bridge control task 305 (only a change in C / W).

Next, the port bundler 102 shown in FIG.
Each processing unit will be described.

FIG. 3 shows the port bundler 102 of this embodiment.
It is a figure for explaining processing of.

In FIG. 3, terminal A is connected to port 1,
This shows a case where the ports 6 to 8 are multiplexed and connected to a general LAN switch.

The communication matrix processing unit 303 generates a matrix table 307 of relay ports and reception ports as shown in FIG.

The address monitoring processing unit 306 generates a terminal management table 308 based on the received packet.

The terminal management table 308 includes, as information in the received packet, terminal name information (MAC address), port number information, and time for monitoring reception of the same packet as bundle information indicating whether or not the packet is a bundle (multiplex link). Is stored.

These pieces of information are updated each time a packet is received, and are updated for a predetermined time (for example, 15
Seconds), it is erased.

The bridge controller task 3 of the present embodiment
Reference numeral 05 designates a process for suppressing the circulation of the packet received from the multiplex link, a process for suppressing the circulation of the packet received from the terminal side, and a degeneration control process when a failure occurs in the multiplex link port in the LAN switch.

The above-described bridge controller task 30
5 will be described with reference to FIG.

As shown in FIG. 4A, in the roundabout suppression processing of a packet received from a multiplex link, a packet is received (step 401), and it is determined whether the received port is a multiplex link port from the multiplex link information 301. (Step 402), if the port is a multiple link port, the received packet is transmitted to the terminal side (Step 403), and the information (terminal name, port number, bundle, monitoring time) in the received packet is managed by the terminal. The packet is registered in the table 308 (step 404). When the same packet as the packet transmitted to the terminal side is received again, the packet is filtered (step 405).

In step 402, if the port is not a multiple link port, the correspondence between the terminal port and the link port is determined based on the multiple link information 301, the received packet is transmitted to the corresponding link port (step 406), and the information in the received packet is transmitted. (Terminal name, port number, bundle, monitoring time) are registered in the terminal management table 308.

Thus, it is possible to prevent a plurality of identical packets received from the multiplex link from being transmitted and circulated a plurality of times.

For example, assuming that a packet is received from the terminal A 309 shown in FIG. 3, the relay destination port is set in the terminal management table 308 in the address monitoring processing unit 306. And it is determined whether it is from a multiple link port (step 411).

Then, it is determined whether the packet has already been registered in the terminal management table 308 (step 41).
2), monitoring time after the registration (in the example of FIG. 3, 2
(Seconds), the packet is discarded on the assumption that the packet has gone around infinitely (step 413).

When the monitoring time (2 seconds or more) elapses after the registration, the received packet is transmitted according to the communication matrix information 307 created by the multiplex link information 301 (step 414).

The communication matrix information 30 shown in FIG.
The symbol “○” in 7 means that the data is relayed to all the ports.

In the case of a packet received for the first time,
Since the relay destination port cannot be searched, the terminal information of the received packet and the received port number are registered in the terminal management table 308, and then the received packet is transmitted in accordance with the communication matrix information 307. Is transmitted, the LAN switch 101 with a built-in port bundler of the present embodiment stores the corresponding terminal and the port number at the time of receiving the response packet in the terminal management table 30.
8 enables connection between the terminals.

By providing the communication matrix information created by the multiplexed link information, transmission of the same packet to all multiplexed links (ports 6, 7, and 8 shown in FIG. 3) can be suppressed.

Next, the bridge controller task 305
Will be described with reference to FIGS. 5 and 6. FIG.

FIG. 5 shows the bridge controller task 30.
5 is a flowchart illustrating the procedure of a degeneration process of FIG.

The bridge controller task 305 transmits a B signal from each port by the fault monitoring task 302 shown in FIG.
If a BPDU is not received by receiving a PDU (Bridge Protocol Data Unit) (step 501), detection of the failed port and information are secured (step 50).
2) It is determined whether the port is a multi-link port (step 503). If the port is a multi-link port, the smallest port number of a normal multi-link port is detected (504), and information on a failed port is detected. Is transmitted to the detected port (step 505).

At this time, as the port number when registering the terminal management table 308 in the address monitoring processing unit 306, the port number of the failed port is registered as it is.

When a BPDU is received from the failed port by the failure monitoring task 302 shown in FIG. 2 (step 507) after the failed port is detected (step 506), it is considered that the failed port has been recovered. A normal packet transmission / reception process is performed (step 508).

The above processing will be specifically described with reference to FIG.

In FIG. 6, reference numeral 601 denotes a flow of a received packet, 602 denotes a terminal port, and 603 denotes a port in which a failure has occurred.

In FIG. 6, when a failure occurs in the multilink port 603, the multilink port 103
The normal port 604 is searched, and the failed port 60
By relaying all the received packets relayed by the port 3 through the normal port 604, it is possible to suppress the influence of the system due to a partial failure of the multiple ring port.

When recovery from a port failure is detected, the original state can be restored, and a temporary failure can be dealt with.

As described above, the LAN switch of the present invention is realized only by controlware control.
A LAN switch that does not need to wait for the bundle function because it does not require dedicated hardware for connection, and because the LAN switch having the bundle function relays packets to the ports that are connected by multiple links and discards them. When connected to a multi-port bridge that does not have this bundle function because it can fix the connection between the terminal and any port of the multi-link even if it receives multiple same source addresses, It is possible to connect to a device having the same function as.

As described above, the invention made by the present inventor is:
Although the present invention has been described in detail with reference to the embodiment, the present invention is not limited to the embodiment, and it is needless to say that various changes can be made without departing from the scope of the invention.

[0052]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

It is possible to prevent the transmission packet from infinitely circulating in the multiplex link between the LAN switches, and to solve the shortage of the band between the LAN switches without providing an expensive device.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a LAN switch according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a LAN switch 101 with a built-in port bundler according to the present embodiment.

FIG. 3 is a diagram for explaining processing of the port bundler 102 according to the embodiment;

FIG. 4 illustrates a bridge controller task 305 according to the embodiment.
It is a flowchart for demonstrating the rotation suppression process of FIG.

FIG. 5 is a flowchart illustrating a procedure of a degeneration process of a bridge controller task 305.

FIG. 6 is a diagram for specifically explaining a degeneration process according to the embodiment;

[Explanation of symbols]

101: LAN switch with built-in port bundler, 102
... Port bundle processing unit, 103 ... Multi-link port,
201: general LAN switch, 301: multiple link information, 302: fault monitoring task, 303: communication matrix processing unit, 304: spanning tree task, 305:
Bridge control task 306: Address monitoring processing unit.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tohru Miyagawa 2-6-1, Otemachi, Chiyoda-ku, Tokyo Within Hitachi Information Network Co., Ltd. (72) Inventor Hiroyuki Wada 810 Shimoimaizumi, Ebina-shi, Kanagawa Hitachi, Ltd. Manufacturing Office System Division (72) Inventor Motonori Sato 1-Horiyamashita, Hadano-shi, Kanagawa Hitachi Computer Electronics Co., Ltd. (56) References JP-A-9-270812 (JP, A) JP-A-9-130385 ( JP, A) JP-A-8-172448 (JP, A) JP-A-9-64901 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/44-12/46

Claims (2)

(57) [Claims] 1. A LAN (local area network)
A LAN switch that performs switching of communication packets between segments of the LAN switch, wherein: multi-link information including information on each port of the LAN switch and the multiplexed port; and the port to which the received packet is relayed based on the multi-link information. Means for generating a matrix table indicating received packet information, monitoring means for storing received packet information, and monitoring reception of the same packet within a predetermined time period; and, based on the matrix table and the monitoring means, A LAN switch comprising means for performing relaying or discarding processing. 2. The LAN switch according to claim 1, wherein a failure of a multi-link port in the LAN switch;
Means for detecting the return, and when a failure occurs in the multi-link port by the means, the multi-link is degenerated, and the packet relayed by the failed port is used by using another normal multi-link port. A LAN switch, comprising: means for transmitting and receiving.