CN115242574A - Distributed KVM node device capable of automatically switching cascade and direct connection modes - Google Patents
Distributed KVM node device capable of automatically switching cascade and direct connection modes Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
- H04L12/2856—Access arrangements, e.g. Internet access
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
- H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
Abstract
The invention discloses a distributed KVM node device capable of automatically switching cascade and direct connection modes. The distributed KVM node comprises a plurality of distributed KVM node devices, wherein each node device comprises a video processing module, an audio processing module, a mouse key processing module, a USB transparent transmission processing module, a network interface module, a network packet switching rule generating module and a cascade port detection module. The device can support the hand-in-hand cascade deployment of KVM node equipment and the deployment mode of a directly connected switch, automatically identifies the connection mode during deployment, does not need manual setting, and increases the deployment flexibility of a distributed KVM system; the cascade mode improves the utilization rate of the ports of the switch, and can reduce the cost of the switch in a distributed system; meanwhile, the audio and video, the mouse key and the USB transparent transmission data are transmitted based on a standard Ethernet message exchange mode, and the method has the advantages of easiness in implementation and low cost.
Description
Technical Field
The invention relates to the technical field of KVM, cascade deployment and distribution, in particular to a distributed KVM node device capable of automatically switching cascade and direct connection modes.
Background
KVM stands for Keyboard (Keyboard), display (Video) and Mouse (Mouse), i.e. a group of Keyboard, display or Mouse is used to control multiple devices, and plays an important role in remote scheduling and monitoring.
In a distributed KVM system developed in recent years, a network is used to transmit video, audio, mouse and USB data, so as to implement control of a remote host. The typical distributed KVM node is directly connected to the switch, which has several disadvantages:
a) Each node fixedly occupies 1-2 switch interfaces, the bandwidth utilization rate is not high, and when the nodes are more, the switch cost is higher;
b) The flexibility is not enough, the deployment is complicated, and the maintenance cost is increased: each node machine is directly connected with the switch through a network cable or an optical fiber, so that the deployed equipment cannot be fully utilized to jump nearby, the use amount of wires is increased, and the construction difficulty is increased;
the cascade technology mentioned in the prior art, which is based on a proprietary protocol and customized switching matrix equipment, cannot utilize a general network switch, and greatly increases the cost of implementation and deployment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a distributed KVM node device capable of automatically switching between a cascade mode and a direct mode. The invention is suitable for occasions needing remote host control, can effectively reduce the development cost and the cost of field network equipment and wiring, and has both economy and flexibility. The KVM node equipment, no matter the host end equipment or the seat end equipment, can flexibly select to be directly connected with the switch or be connected to the network in a cascading mode through another KVM node equipment, does not need manual configuration, and reduces the deployment cost and the switch cost by providing a direct connection or cascading deployment mode. And the adopted protocol and the switching equipment are standard Ethernet protocols, so that the development cost and the raw material model selection cost are reduced.
The technical scheme of the invention is specifically introduced as follows.
The invention provides a distributed KVM node device capable of automatically switching cascade and direct connection modes, which comprises a plurality of sub-nodes
A distributed KVM node device; each distributed KVM node device includes the following modules:
the video processing module is used for acquiring/coding/packaging the video signals or unpacking/decoding/outputting the video signals; video signals input from the outside of the node device are collected and encoded to form a standard network message, and the standard network message is sent to a network packet switching module; or receiving the network message from the network packet switching module, decoding the video data after unpacking, and then outputting the video data to the external part of the node device for displaying;
the audio processing module is used for collecting/encoding/packaging and unpacking/decoding/outputting audio signals; collecting and coding audio signals input from the outside of the node device to form a standard network message, and sending the standard network message to a network packet switching module; or receiving the network message from the network packet switching module, decoding the audio data after unpacking, and then outputting the audio data to the outside of the node device for playing;
the mouse key processing module is used for acquiring/packaging and unpacking/outputting mouse key signals; collecting and coding mouse key signals input from the outside of the node device to form a standard network message, and sending the standard network message to a network packet switching module; meanwhile, the network packet switching module receives the network message, decodes the audio data after unpacking, and then outputs the audio data to the outside of the node device for playing;
the network interface module is used for receiving and transmitting network messages from the network port or the optical port; the message sent by the network packet switching module and the cascade interface detection module is forwarded to the network interface or the optical interface; or the network message received from the network port or the optical port is forwarded to the network packet switching module and the cascade port detection module; the number of the network interface modules is more than 2;
the network packet switching module is used for switching network messages of each module; exchanging messages of the video processing module, the audio processing module, the mouse key processing module and the network interface module according to rules configured by the network packet exchange rule generating module;
the network packet switching rule generating module is used for generating switching rules and issuing the rules to the network packet switching module; receiving a detection result of the cascade port detection module, and generating an exchange rule according to the detection result;
the cascade port detection module is used for detecting the cascade port; and sending a special cascade mode detection packet to each network interface module, monitoring the cascade mode detection packets received by each network interface module, and judging whether each interface is a cascade interface.
In the invention, the distributed KVM node equipment also comprises a USB transparent transmission processing module which is used for collecting/packaging and unpacking/outputting USB data; USB signals input from the outside of the node device are collected and encoded to form a network message, and the network message is sent to a network packet switching module; and meanwhile, receiving the network message from the network packet switching module, decoding the USB data after unpacking, and then outputting the USB data to a USB interface of external equipment of the node device.
In the present invention, when distributed KVM node devices are cascaded, one network interface module of at least one of the KVM node devices is connected to a network switch, and each of the KVM node devices that is not connected to the switch is connected to another KVM node device; when the KVM node equipment is directly connected with the switch, at least one network interface module is connected with the network switch, and no network interface module is connected with other distributed KVM node devices.
In the invention, in all distributed KVM node equipment, one network interface module of at least one distributed KVM node equipment is in a direction of an exchanger and is connected with the network exchanger, and a connecting medium of the network interface module is a network cable or an optical fiber; the network switch is a general purpose ethernet switch.
In the invention, whether the network interface module is a cascade port is judged through a cascade mode detection packet, the judgment that the network interface module is an exchanger orientation port or a node orientation port is realized, the destination MAC address and the source MAC address of a network message in the cascade mode detection packet sent to each network interface module by the cascade port detection module are the same, and for a node device comprising the exchanger orientation port network interface module, indication information SFlag is added into the data load of the network message MAC packet sent to the node orientation port network interface module.
In the present invention, the method for determining whether a certain network interface module 5 is "switch orientation" is as follows:
a) If the network interface module 5 is connected to the network and does not receive any cascade mode detection packet, it is determined that the network interface module 5 is directly connected to the switch and is oriented to the switch;
b) If the network interface module 5 receives the cascade mode detection packet and the SFlag is analyzed from the data load of the packet, then
Judging that the network interface module 5 is 'switch orientation';
c) Otherwise, the network interface module 5 is "node oriented".
In the invention, the network packet switching rule generating module generates the network packet switching rule according to the cascade direction of each port of the node detected by the cascade port detecting module, and the network packet switching module level exchanges data of the network interface module based on the signal generated by the network packet switching rule generating module so as to realize the switching of the cascade mode and the direct connection mode.
Compared with the prior art, the invention has the beneficial effects that: the system is suitable for occasions needing remote host control, can effectively reduce development cost and the cost of field network equipment and wiring, and has both economy and flexibility. The KVM node equipment, no matter the host end equipment or the seat end equipment, can flexibly select to be directly connected with the switch or be connected to the network in a cascading mode through another KVM node equipment, does not need manual configuration, and reduces the deployment cost and the switch cost by providing a direct connection or cascading deployment mode. And the adopted protocol and the switching equipment are standard Ethernet protocols, so that the development cost and the raw material model selection cost are reduced.
Drawings
Fig. 1 is a block diagram illustrating a distributed KVM node apparatus capable of automatically switching between cascade and direct connection modes in embodiment 1.
Fig. 2 is a diagram illustrating a cascading manner of a distributed KVM node apparatus capable of automatically switching between a cascading mode and a direct mode in embodiment 1.
Fig. 3 is a block diagram of a distributed KVM node apparatus capable of automatically switching between cascade and direct modes according to embodiment 1.
Fig. 4 is a block diagram of a distributed KVM node apparatus capable of automatically switching between cascade and direct mode according to embodiment 2.
Fig. 5 is a block diagram of a cascade and direct-connected hybrid networking application of a distributed KVM node apparatus capable of automatically switching between cascade and direct-connected modes in embodiment 2.
The reference numbers in the figures: the system comprises a 1-video processing module, a 2-audio processing module, a 3-mouse key processing module, a 4-USB transparent transmission processing module, a 5-network interface module, a 6-network packet switching module, a 7-network packet switching rule generating module and an 8-cascade interface detection module.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and embodiments.
Example 1
Fig. 1 is a block diagram of a distributed KVM node apparatus capable of automatically switching between a cascade mode and a direct mode in embodiment 1, which includes a plurality of distributed KVM node devices deployed in a cascade mode or a direct mode; each distributed KVM node device comprises a video processing module 1, an audio processing module 2, a mouse key processing module 3, a USB transparent transmission processing module 4, a network interface module 5, a network packet switching module 6, a network packet switching rule generating module 7 and a cascade port detection module 8.
The video processing module 1 is connected with the network packet switching module 6, the audio processing module 2 is connected with the network packet switching module 6, the mouse key processing module 3 is connected with the network packet switching module 6, the USB transparent transmission processing module 4 is connected with the network packet switching module 6, the network interface module 5 is connected with the network packet switching module 6 and the cascade port detection module 8, the network packet switching module 6 is connected with the video processing module 1, the audio processing module 2, the mouse key processing module 3, the USB transparent transmission processing module 4, the network interface module 5 and the network packet switching rule generation module 7, the network packet switching rule generation module 7 is connected with the network packet switching module 6 and the cascade port detection module 8, and the cascade port detection module 8 is connected with the network interface module 5 and the network packet switching rule generation module 7.
The structure and function of the components of the device in the embodiments are as follows:
the video processing module 1 is used for collecting/coding/packaging video signals, collecting and coding the video signals input from the outside of the node device to form a standard network message, and sending the standard network message to the network packet switching module 6;
the audio processing module 2 is used for collecting/coding/packaging and unpacking/decoding/outputting audio signals; collecting and coding audio signals input from the outside of the node device to form a standard network message, and sending the standard network message to a network packet switching module 6; or receiving the network message from the network packet switching module 6, decoding the audio data after unpacking, and outputting the audio data to the outside of the node device for playing;
the mouse key processing module 3 is used for collecting/packaging and unpacking/outputting mouse key signals; collecting and coding mouse key signals input from the outside of the node device to form a standard network message, and sending the standard network message to the network packet switching module 6; meanwhile, the network packet is received from the network packet switching module 6, and the mouse key data is decoded after unpacking and then output to the outside of the node device;
the USB transparent transmission processing module 4 is used for collecting/packaging and unpacking/outputting USB data; USB signals input from the outside of the node device are collected and encoded to form a standard network message, and the standard network message is sent to a network packet switching module 6; meanwhile, the network packet switching module 6 receives the network message, decodes the USB data after unpacking, and then outputs the USB data to a USB interface of external equipment of the node device;
a network interface module 5, which is used for receiving and sending network messages from a network port or an optical port; the messages sent by the network packet switching module 6 and the cascade port detection module 8 are forwarded to the network port or the optical port; or the network message received on the network port or the optical port is forwarded to the network packet switching module 6 and the cascade port detection module 8;
the network packet switching module 6 is used for switching network messages of each module; exchanging messages of the video processing module 1, the audio processing module 2, the mouse key processing module 3, the USB transparent transmission processing module 4 and the network interface module 5 according to rules configured by the network packet exchange rule generating module 7; the network packet switching rules are as follows:
if one of the network interface modules 5 is "switch oriented" (denoted by S) and the other network interface module 5 is "node oriented" (denoted by N), the rules for network packet switching are:
a) The module 1 sends S;
b) The module 2 sends S, and S is sent to the module 2;
c) The module 3 sends S, and S sends S to the module 3;
d) The module 4 sends S, and S is sent to the module 4;
e) S is sent to N, and N is sent to S;
the network packet switching rule generating module 7 is used for generating switching rules and sending the rules to the network packet switching module 6; receiving the detection result of the cascade port detection module 8 and generating an exchange rule according to the detection result;
a cascade port detection module 8, configured to detect a cascade port; a special cascade mode detection packet is sent to each network interface module 5, and meanwhile, the cascade mode detection packet received by each network interface module 5 is monitored, and whether each interface is a cascade interface is judged. Wherein, cascade the state that the mouth detection module detects each network interface module, the state includes: "switch orientation" and "node orientation"; the specific judgment method is as follows:
i) The cascade interface detection module 8 sends a special cascade mode detection packet to all the network interface modules 5, and the detection packet has the following characteristics:
a) In the standard Ethernet MAC packet, the source MAC address and the destination MAC address are the same and are the MAC addresses of the KVM node device;
b) If the node device comprises the network interface module of 'switch orientation', adding indication information (SFlag) in the data load of the network message MAC packet sent to the network interface module of 'node orientation';
ii) the method of determining whether a certain network interface module 5 is "switch oriented" is as follows:
a) If the network interface module 5 is connected to the network and does not receive any cascade mode detection packet, it is determined that the network interface module 5 is directly connected to the switch and is oriented to the switch;
b) If the network interface module 5 receives the cascade mode detection packet and the SFlag is analyzed in the data load of the packet, it is determined that the network interface module 5 is oriented to the switch;
c) Otherwise, the network interface module 5 is "node-oriented";
the distributed KVM node apparatus described in this embodiment may be deployed in two ways:
i) A cascade mode: as shown in fig. 2, the distributed KVM node apparatus 1 is connected to the switch and the distributed KVM node apparatus 2; the distributed KVM node equipment N is connected with distributed KVM node equipment N +1 and distributed KVM node equipment N-1, wherein N > N > =2; the distributed KVM node equipment N is connected with distributed KVM node equipment N-1;
ii) direct connection: as a specific example of the cascade connection, as shown in fig. 3, the distributed KVM node 1 is connected to a switch;
the embodiment is suitable for occasions needing remote host control, can effectively reduce development cost and the cost of field network equipment and wiring, and has both economy and flexibility. The KVM node equipment, no matter the host end equipment or the seat end equipment, can flexibly select to be directly connected with the switch or be connected with the network through the cascade of another KVM node equipment, does not need manual configuration, and reduces the deployment cost and the switch cost by providing a direct connection or cascade deployment mode. And the adopted protocol and the switching equipment are standard Ethernet protocols, so that the development cost and the raw material model selection cost are reduced.
Example 2
Fig. 4 is a block diagram of a distributed KVM node apparatus capable of automatically switching between cascade mode and direct mode in embodiment 1, which includes a video processing module 1, an audio processing module 2, a mouse key processing module 3, a USB transparent transmission processing module 4, a network interface module 5, a network packet switching module 6, a network packet switching rule generating module 7, and a cascade port detecting module 8.
The video processing module 1 is connected with the network packet switching module 6, the audio processing module 2 is connected with the network packet switching module 6, the mouse key processing module 3 is connected with the network packet switching module 6, the USB transparent transmission processing module 4 is connected with the network packet switching module 6, the network interface module 5 is connected with the network packet switching module 6 and the cascade port detection module 8, the network packet switching module 6 is connected with the video processing module 1, the audio processing module 2, the mouse key processing module 3, the USB transparent transmission processing module 4, the network interface module 5 and the network packet switching rule generation module 7, the network packet switching rule generation module 7 is connected with the network packet switching module 6 and the cascade port detection module 8, and the cascade port detection module 8 is connected with the network interface module 5 and the network packet switching rule generation module 7.
The structure and function of the components of the device in the embodiments are as follows:
a video processing module 1 for unpacking/decoding/outputting video signals; receiving the network message from the network packet switching module 6, decoding the video data after unpacking, and then outputting the video data to the external part of the node device for displaying; the module can select an HI3536 chip of a Haesi semiconductor to realize the unpacking, decoding and HDMI output of video streaming media;
the audio processing module 2 is used for collecting/encoding/packaging and unpacking/decoding/outputting audio signals; collecting and coding audio signals input from the outside of the node device to form a standard network message, and sending the standard network message to a network packet switching module 6; or receiving the network message from the network packet switching module 6, decoding the audio data after unpacking, and outputting the audio data to the outside of the node device for playing; the module can adopt HI3536 chip of Haesi semiconductor to realize the package/unpacking, coding/decoding and acquisition/output of audio streaming media;
the mouse key processing module 3 is connected with a mouse keyboard and is used for processing acquisition/package and unpacking/output of mouse key signals; collecting and coding mouse key signals input from the outside of the node device to form a standard network message, and sending the standard network message to the network packet switching module 6; meanwhile, the network packet is received from the network packet switching module 6, and the audio data is decoded after unpacking and then output to the outside of the node device for playing; the module can adopt a network unloading processor of an AX68002 2 port USB KVM multi-computer switcher single chip of the WeChat electronics and a W7500 single chip of the WIZNET company to realize the mutual conversion between a mouse key USB port and a network packet;
the USB transparent transmission processing module 4 is connected with the USB equipment and is used for collecting/packaging and unpacking/outputting USB data;
USB signals input from the outside of the node device are collected and encoded to form a standard network message, and the standard network message is sent to a network packet switching module 6; meanwhile, the network packet switching module 6 receives the network message, decodes the USB data after unpacking, and then outputs the USB data to a USB interface of external equipment of the node device; the module can adopt LAN7801 USB of Microchip company to change the chip of Ethernet to realize USB apparatus (such as U disk) and the mutual conversion of the network packet;
a network interface module 5, which is used for receiving and sending network messages from a network port or an optical port; the messages sent by the network packet switching module 6 and the cascade port detection module 8 are forwarded to the network port or the optical port; or the network message received from the network port or the optical port is forwarded to the network packet switching module 6 and the cascade port detection module 8; the module can adopt RTL8211E of Realtek Ruyi company to realize the transceiving of network packets;
the network packet switching module 6 is used for switching network messages of each module; exchanging messages of the video processing module 1, the audio processing module 2, the mouse key processing module 3, the USB transparent transmission processing module 4 and the network interface module 5 according to rules configured by the network packet exchange rule generating module 7; the module can realize the forwarding of the network message according to the rule by a 56504 Ethernet exchange chip of Broadcom company;
the network packet switching rule generating module 7 is used for generating switching rules and sending the rules to the network packet switching module 6; receiving the detection result of the cascade port detection module 8 and generating an exchange rule according to the detection result; the module can select an STM32H723 microcontroller chip of the semiconductor company to realize the generation of the rule;
a cascade port detection module 8, which is used for detecting the cascade port; a special cascade mode detection packet is sent to each network interface module 5, and meanwhile, the cascade mode detection packet received by each network interface module 5 is monitored, and whether each interface is a cascade interface is judged. The module can select an STM32H723 microcontroller chip of the semiconductor company to realize the transmission, the reception and the detection of the network detection packet.
Fig. 5 is a block diagram of an application of a cascade and direct connection hybrid networking of distributed KVM node apparatuses capable of automatically switching between cascade and direct connection modes in embodiment 2.
In the distributed KVM node apparatus capable of automatically switching between the cascade mode and the direct connection mode, the cascade direction of each port of the node is obtained through automatic cascade state detection, so that a corresponding network packet data exchange rule is generated, and adaptive switching between the cascade mode and the direct connection deployment mode is realized. The invention has the advantages that:
the deployment modes of hand-in-hand cascade deployment and direct connection switches are supported, the connection mode is automatically identified during deployment, manual setting is not needed, the deployment flexibility of the distributed KVM system is improved, and the labor cost of deployment is reduced; the cascade mode improves the utilization rate of the switch ports and can reduce the cost of the switch in the distributed system.
Meanwhile, the transmission modes of audio and video, mouse keys and USB transparent transmission data related by the invention are all based on a standard Ethernet message exchange mode, and have the advantages of easy realization and low cost.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A distributed KVM node device capable of automatically switching cascade and direct connection modes is characterized by comprising a plurality of branches
A distributed KVM node device; each distributed KVM node device includes the following modules:
the video processing module (1) is used for collecting/encoding/packaging the video signal or unpacking/decoding/outputting the video signal; install the node
The video signal input from the outside is collected and coded to form a standard network message, and the standard network message is sent to a network packet switching module (6); or the network packet switching module (6) receives the network message, decodes the video data after unpacking, and then outputs the video data to the external part of the node device for displaying;
an audio processing module (2) for acquisition/encoding/packing and unpacking/decoding/output of audio signals; audio signals input from the outside of the node device are collected and encoded to form a standard network message, and the standard network message is sent to a network packet switching module (6); or receive the network message from the packet switching module of the network (6) at the same time, decode the audio data after unpacking, then output to the outside of node device and broadcast;
the mouse key processing module (3) is used for acquiring/packaging and unpacking/outputting mouse key signals; collecting and coding mouse key signals input from the outside of the node device to form a standard network message, and sending the standard network message to a network packet switching module (6); meanwhile, the network packet is received from the network packet switching module (6), and the audio data is decoded after unpacking and then output to the outside of the node device for playing;
a network interface module (5) for receiving and transmitting network messages from an internet port or an optical port; the message sent by the network packet switching module (6) and the cascade port detection module (8) is forwarded to the network port or the optical port; or the network message received on the network port or the optical port is forwarded to the network packet switching module (6) and the cascade port detection module (8); the number of the network interface modules (5) is more than 2;
a network packet switching module (6) for switching network messages of each module; exchanging network messages of the video processing module (1), the audio processing module (2), the mouse key processing module (3) and the network interface module (5) according to rules configured by the network packet exchange rule generating module (7);
the network packet switching rule generating module (7) is used for generating the switching rule and sending the rule to the network packet switching module (6); receiving the detection result of the cascade port detection module (8), and generating an exchange rule according to the detection result;
a cascade port detection module (8) for detecting a cascade port; and sending a special cascade mode detection packet to each network interface module (5), monitoring the cascade mode detection packets received by each network interface module (5) and judging whether the interface is a cascade interface.
2. The distributed KVM node apparatus capable of automatically switching between cascade and direct mode according to claim 1, further comprising a USB transparent transmission processing module (4) for USB data collection/packing and unpacking/output; USB signals input from the outside of the node device are collected and encoded to form a network message, and the network message is sent to a network packet switching module (6); meanwhile, the network packet is received from the network packet switching module (6), and the USB data is decoded after unpacking and then output to a USB interface of external equipment of the node device.
3. The distributed KVM node arrangement with automatic cascaded, direct mode switching according to claim 1, wherein at least one of the network interface modules (5) of all distributed KVM node devices is "switch-oriented" and connected to the network switch, and the connection medium is a cable or fiber.
4. The distributed KVM node apparatus with auto-switchable cascade, direct connection mode according to claim 3, wherein the network switch to which the network interface module (5) is connected is a general purpose Ethernet switch.
5. The distributed KVM node apparatus capable of automatically switching between the cascade mode and the direct mode according to claim 1 or 2, wherein the network messages of the video processing module (1), the audio processing module (2), the mouse key processing module (3), and the USB transparent transmission processing module (4) are all standard ethernet messages.
6. The distributed KVM node apparatus capable of automatically switching between the cascade mode and the direct mode according to claim 1, wherein the cascade mode detection packet is used to determine whether the network interface module (5) is a cascade port, and the determination is performed by determining whether the network interface module is "switch-oriented" or "node-oriented", and the destination MAC address and the source MAC address of the network packet in the cascade mode detection packet sent by the cascade port detection module (8) to each network interface module are the same, and for the node apparatus including the "switch-oriented" network interface module, the node apparatus adds the indication information SFlag to the data payload of the network packet MAC packet sent to the "node-oriented" network interface module.
7. The distributed KVM node arrangement capable of automatically switching between cascaded and direct mode according to claim 6, wherein the method for determining whether a certain network interface module (5) is "switch oriented" is as follows:
a) If the network interface module (5) is connected with a network and does not receive any cascade mode detection packet, judging that the network interface module (5) is directly connected with a network switch and is oriented to the network switch;
b) If the network interface module (5) receives the cascade mode detection packet and the SFlag is analyzed in the data load of the packet, the network interface module (5) is judged to be oriented to the switch;
c) Otherwise, the network interface module (5) is "node oriented".
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| CN202210850435.XA CN115242574B (en) | 2022-07-19 | 2022-07-19 | Distributed KVM node device capable of automatically switching cascade and direct connection modes |
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