CN1889396B - Device, system and method capable of realizing optical monitoring channel information transmission - Google Patents

Abstract

This invention relates to a device, a system and a method for channel information transmission of light monitor, in which, said method is used in a system for realizing light monitor channel information transmission applying an exchange mode including: the third layer exchange receives light monitor channel information to select suitable routes for transmitting the information based on the corresponding relation between its own port and nodes in the network, which does not set up fixed connection between the source and the target and will not occupy band width resource after the transmission so as to use the band width fully.

Description

Device, system and method capable of realizing optical monitoring channel information transmission

technical field

The invention relates to a device, system and method for information transmission in the field of data exchange, in particular to a device, system and method for exchanging information of an optical monitoring channel in a WDM system.

Background technique

With the development of WDM (Wavelength Division Multiplexer) system in the direction of large capacity, long distance and intelligence, the requirements for optical transmission network management are getting higher and higher, the amount of information is greatly increased, and the network topology is more complex. This requires that the data channel of the network management information must provide sufficient bandwidth, strong routing functions, and have the ability to automatically adapt to changes in the network topology.

The development of optical transmission system provides higher bandwidth for the transmission of network management information. WDM equipment provides OSC (Optical Supervisory Channel), which uses a dedicated wavelength to transmit information such as network management and business calls. According to the implementation method, it is divided into two ways: in-band and out-of-band: in-band, OSC can be amplified by the optical amplifier, but OSC will be affected by the failure of the optical amplifier; out-of-band, OSC does not pass through the optical amplifier. Reduce the transmission rate in exchange for higher receiving sensitivity, usually at a rate of 2Mbit/s. Recently, due to the rapid development of optical devices, higher-sensitivity optical devices have appeared, which makes the OSC mode outside the band can adopt a speed as high as 155MBit/s. In this case, the design of the network management information processing system should make full use of the bandwidth advantage of the optical transmission system.

In the existing optical transmission system, the transmission channel of the network management information is realized by the traditional circuit switching method. The general system structure of this type of method is shown in Figure 1, mainly by the channel switching device 101, the control device 102, the multiplexing and demultiplexing device 103, other optical service devices 104 and various information channels (ECC (logical data channel), DCN (Data Communication Network), OSC, etc.) constitute. In the figure, the control device manages the multiplexing and demultiplexing device 103 and other optical service devices 104 through CI (optical transmission equipment control and monitoring interface); and the interaction between the control device 102 and the channel switching device 101 is realized through I_NNI (internal network interface) The channel switching device 101 is responsible for processing from OSC, E_NNI (external network interface), all kinds of data of I_NNI; The logical link between the channel switching devices of each network element is ECC, which can be connected to MPI (main channel) Interface) OSC or E_NNI connected to DCN to achieve.

Existing equipment of this type adopts a traditional circuit switching method to implement a channel switching device. The problem with this is that circuit switching is connection-oriented. Once a connection is established, no matter whether there is data being transmitted or not, it will occupy a certain amount of bandwidth, which cannot make full use of bandwidth resources. Moreover, its connection mode is relatively fixed, and every time the connection is changed, it must go through the process of disconnecting and establishing a connection, which has limitations in adapting to flexible network topologies and is not conducive to the expansion of switching capacity.

In order to make full use of the bandwidth, a technology that applies Ethernet Layer 2 switching to the optical monitoring channel has emerged recently. The general structure of the technology is still similar to that in Figure 1. However, the channel switching device 101 is realized by using an Ethernet Layer 2 switch. Due to the adoption of Ethernet switching technology, this solution can obtain 100Mbit/s or even higher bandwidth in the optical monitoring channel. However, because it works on the second layer, this switching method is realized based on the data link layer address of each node, and does not have a routing function. For a switch, if the source node cannot provide the data link layer address of the forwarded destination node, it must use a broadcast packet to obtain the destination address. This reduces bandwidth and is prone to broadcast storms. In the case of complex and changing network topologies, using software protocols such as Spanning Tree Protocol to suppress network storms and adapt to changes in network topologies has poor flexibility. At the same time, because it cannot handle data exchange between different IP subnets, the scalability is also poor.

In this case, it is a better choice to adopt three-layer switching technology or higher layer switching technology. The three-layer switching technology is named after it works on the third layer of the OSI seven-layer network standard model. The three-layer switching introduces the concept of routing on the basis of the two-layer switching, which can effectively solve the problem that the two-layer switching broadcast domain is too large and cannot handle different The defect of the subnet, while retaining the advantages of high forwarding efficiency of Layer 2 switching. On the other hand, the TCP/IP protocol has been widely used in modern network management. The TCP/IP protocol has strong flexibility and openness, and the three-layer exchange that can handle the IP protocol can make full use of these advantages.

In addition, in this case, the use of multi-layer switching technology is also a better choice. Multi-layer switching technology refers to the technology of switching at different levels based on the switching of the data link layer according to the OSI network model. Multilayer switching technology includes Layer 2 switching, Layer 3 switching, and the newly emerging Layer 4 switching and Layer 7 switching. Currently, Layer 3 switching and Layer 2 switching are widely used. Multilayer switching is a kind of packet switching, which has the characteristics of high efficiency, stability, and easy expansion, and is suitable for building information channels for network management.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and system for realizing optical monitoring channel information transmission by using the switching method, so as to overcome the disadvantages of insufficient utilization of channel bandwidth and relatively mechanical connections in the prior art.

In order to achieve the above object, the present invention provides a channel switching device for realizing the information transmission of the optical monitoring channel. The device is connected with the control device through the internal network interface, connected with the data transmission network and the network management server through the external The channel is connected to the multiplexing and demultiplexing device, and the channel switching device further includes:

A photoelectric converter, used to receive the optical monitoring channel information from the optical monitoring channel, convert it into an electrical signal and transmit it to the physical layer information preprocessor;

A level converter, used to receive the optical monitoring channel information from the external network interface, perform level conversion and isolation on it, and transmit it to the physical layer information preprocessor;

An internal level converter, used to receive the optical monitoring channel information from the control device through the internal network interface and transmit it to the physical layer information preprocessor;

The physical layer information preprocessor is used to receive the optical monitoring channel information from the photoelectric converter, level converter or internal level converter, and transmit it to the switch after decoding and regeneration;

The switch is a layer 3, 4 or 7 switch, used to select a route for switching or forwarding according to the address information in the received optical monitoring channel information;

A route generating and exchanging controller, connected to the switch, is used to generate and maintain routing information for the switch.

The third layer switch also includes:

a port, configured to receive data processed by the physical layer information preprocessor;

A second-layer forwarding module, connected to the port, for forwarding data having a second-layer destination address among the data processed by the physical layer information preprocessor;

The third-layer routing module is connected with the second-layer forwarding module, and is used for generating and switching the data provided by the switching controller for the data that does not have the second-layer destination address among the data processed by the physical layer information preprocessor Routing information, set the corresponding second-level destination address, and hand it over to the second-level forwarding module for forwarding.

The physical layer information preprocessor is an Ethernet physical layer interface circuit, and the third-layer switch is an IP three-layer switch,

The present invention also provides a system for realizing the information transmission of the optical monitoring channel by means of switching, including a channel exchange device for realizing the information transmission of the optical monitoring channel, the device is connected with the control device through the internal network interface, and connected with the data transmission network through the external network interface and the network management server, and connected to the multiplexing and demultiplexing device through the optical monitoring channel, and the control device is connected to the multiplexing and demultiplexing device through the optical transmission equipment control monitoring interface, and the device further includes:

A photoelectric converter, used to receive the optical monitoring channel information from the optical monitoring channel, convert it into an electrical signal and transmit it to the physical layer information preprocessor;

A level converter, used to receive the optical monitoring channel information from the external network interface, perform level conversion and isolation on it, and transmit it to the physical layer information preprocessor;

The internal level converter is used to receive the optical monitoring channel information from the control device through the internal network interface and transmit it to the physical layer information preprocessor;

The physical layer information preprocessor is used to receive the optical monitoring channel information from the photoelectric converter, level converter or internal level converter, and transmit it to the switch after decoding and regeneration;

The switch is a layer 3, 4 or 7 switch, used to select a route for switching or forwarding according to the address information in the received optical monitoring channel information;

A route generating and exchanging controller, connected to the switch, is used to generate and maintain routing information for the switch.

The third layer switch also includes:

a port, configured to receive data processed by the physical layer information preprocessor;

A second-layer forwarding module, connected to the port, for forwarding data having a second-layer destination address among the data processed by the physical layer information preprocessor;

The third-layer routing module is connected with the second-layer forwarding module, and is used for generating and switching the data provided by the switching controller for the data that does not have the second-layer destination address among the data processed by the physical layer information preprocessor Routing information, set the corresponding second-level destination address, and hand it over to the second-level forwarding module for forwarding.

The control device further includes:

A data transceiver, connected to the control and monitoring interface of the optical transmission equipment, for information transmission;

A data processor, connected to the data transceiver, for processing data from the control and monitoring interface of the optical transmission equipment;

The data encapsulation and decapsulation device is used for encapsulating the data processed by the data processor into a format recognizable by the channel switching device, and then sending it to the channel switching device through the internal network interface.

The data encapsulation and decapsulation device is also used to encapsulate the second-level destination address in its data format for data with a second-level destination address, and to encapsulate the second-level destination address in its data format for data without a second-level destination address. Encapsulating the address of the third layer routing module.

The physical layer information preprocessor is an Ethernet physical layer interface circuit, the third-layer switch is an IP three-layer switch, the data transceiver is a UART communication interface, and the data processor is a CPU, The data encapsulation and decapsulation device is an Ethernet interface that cooperates with TCP/IP.

The present invention also provides a method for realizing the information transmission of the optical monitoring channel by using the switching method, which is used in a system for realizing the information transmission of the optical monitoring channel by using the switching method, including the following steps:

The third-layer switch receives the information of the optical monitoring channel, and selects an appropriate route to forward the information according to the corresponding relationship between its own port and each node in the network.

The method further includes:

For the optical monitoring channel information with the second layer destination address, directly send it to the corresponding port;

For the optical monitoring channel information that does not have a second-layer destination address, the third-layer switch reads the third-layer address information in the optical monitoring channel information, selects an appropriate route, and Add the corresponding layer-2 destination address and forward it to the corresponding port.

The method also includes:

Step 11, the control device receives and processes the information of the optical monitoring channel, and determines the information to be sent;

Step 12: Encapsulate the information to be sent into a format recognizable by the channel switching device, and then send it to the channel switching device through the internal network interface.

The method further comprises:

Judging whether the information of the optical monitoring channel includes the second layer destination address, if so, encapsulating the second layer destination address in its data format, if not, encapsulating the third layer destination address in the third layer switch in its data format The address of the layer routing module.

The method also includes:

The information is forwarded to the optical monitoring channel or the network interface, and transmitted through the optical monitoring channel or the network interface.

The present invention does not establish a fixed connection between the source and the destination, and does not occupy bandwidth resources after the forwarding is completed, so the bandwidth can be fully utilized. At the same time, the multi-layer switching technology adopted can make full use of the bandwidth provided by the system and dynamically adapt to changes in the network topology.

Description of drawings

Fig. 1 is a general implementation of optical monitoring channel information transmission;

Fig. 2 is a functional structural diagram of a channel switching device;

Fig. 3 is the functional structural diagram of the third layer switch;

Fig. 4 is the functional structural diagram of control device;

Fig. 5 is a flow chart of completing a message forwarding;

Fig. 6 is a system structure diagram of an embodiment of optical monitoring channel information transmission;

Fig. 7 is a system structure diagram of an embodiment of optical monitoring channel information transmission;

Fig. 8 is a system structure diagram of an embodiment of optical monitoring channel information transmission;

Fig. 9 is a structural diagram of an embodiment of the channel switching device;

Fig. 10 is a structural diagram of an embodiment in which the channel switching device adopts a layer-3 switch;

Fig. 11 is a structural diagram of an embodiment of the third layer switching device;

Fig. 12 is a structural diagram of an embodiment of the control device;

Fig. 13 is a flowchart of an embodiment of the implementation method of the present invention.

Detailed ways

The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 shows the system structure diagram for realizing the information transmission of the optical monitoring channel. On the basis of the general structure, the present invention improves the internal structure of the system device, and adopts multi-layer switching technology to realize the transmission of the optical monitoring channel information.

As shown in FIG. 2 , it is a functional structural diagram of the channel switching device of the present invention. Referring to FIG. 1 , the channel switching device 101 includes a layer-3 switch 211 , a physical layer information preprocessor 212 , a photoelectric converter 213 , a level converter 214 , an internal level converter 215 , and a routing generation and switching controller 216 . Wherein, the layer-3 switch 211 may be a switch conforming to a higher layer of the OSI network model, such as a layer-4 switch or a layer-7 switch, and its basic principle is similar to that of this embodiment. When the signal of the optical monitoring channel information is transmitted, the photoelectric converter 213 receives the signal from the optical monitoring channel (OSC) and converts it into an electrical signal, or the level converter 214 receives the signal from E_NNI and performs electrical switching on it. Level translation and isolation, or internal level shifter 215 receives the signal from I_NNI. 213 , 214 , and 215 are respectively connected to the physical layer information preprocessor 212 . The physical layer information preprocessor 212 decodes the information from 213 , 214 , and 215 , and provides the information to the third layer switch 211 after processing such as regeneration. Information from different sources is exchanged and forwarded by Layer 3 switches. The layer-3 switch is connected to the route generation and switching controller 216 , and its switching behavior is controlled by the route generation and switching controller 216 .

Fig. 3 is a functional structural diagram of the third-layer switch in the channel switching device. Each port 301 , 302 , 303 is used to receive and transmit data packets from the physical layer information preprocessor 212 . If the data packet contains the determined layer-2 address, it is directly forwarded in the layer-2 forwarding module 312 . For those that cannot be forwarded directly, they are forwarded to the third-layer routing module 313 for processing. The layer-3 routing module processes the data packet according to the routing information provided by the route generation and switching controller 216, sets a reasonable layer-2 address, and hands it to the layer-2 forwarding module 312 for forwarding.

Figure 4 shows the functional structure diagram of the control device. The control device 102 includes a data encapsulation and decapsulation unit 421 , a data processor 422 and a data transceiver 423 . The data transceiver 423 is connected to the CI and is responsible for processing information transmission between the controller 102 and the CI. The data processor 422 is connected to the data transceiver 423, and after processing the data from the CI, the information to be sent is handed over to the data encapsulation and decapsulation device 421 to be encapsulated into a format recognizable by the channel switching device 101, wherein the data processing The device 422 also needs to judge whether it knows the second layer destination address of the sent information. If known, the data encapsulation and decapsulator 421 directly fills the second layer destination address in the data format, and if not known, then fills in the data format the address corresponding to the third layer routing module. Convert to a packet format that the switching device can operate on. Then send it to the channel switching device 101 through I_NNI. The information from the channel switching device 101 is converted into a format that can be processed by the data processor 422 through the data encapsulation and decapsulation unit 421 .

It can be seen from the structures in Fig. 3 and Fig. 4 that only when the data cannot be directly forwarded at the second layer, it is handed over to the routing device at the third layer for processing. And after one routing processing, it can be forwarded multiple times, taking into account high bandwidth and flexibility. In some cases, the three-layer module can be simplified to form a simple two-layer switching system, which greatly saves the cost.

The above is the system structure of the present invention that adopts the switching technology to realize the information transmission of the optical monitoring channel. The method for transmitting the information of the optical monitoring channel based on the above system structure of the present invention will be introduced below in conjunction with the accompanying drawings.

Figure 5 shows the flow chart of the transmission of optical monitoring channel information from the control device to the channel switching device, and it is described as follows in conjunction with Figures 1 to 4:

The OSC information is transmitted from another network element to the control device 102 of the local network element through CI, then the control device 102 first performs the steps of data collection and processing, that is, the data processor 422 in the control device 102 receives the data through the data transceiver 423 Data from CI and processed (step 501). Subsequently, the data processor 422 in the control device 102 transmits the information to be sent to the data encapsulation and decapsulation device 421, and at the same time judges whether it includes the destination layer 2 address, referred to as the layer 2 destination address. If included, directly fill in the second layer destination address in the data format, if not included, then fill in the address corresponding to the third layer routing module in the data format. Convert to a data packet format that the channel switching device 101 can operate (step 502).

Control device 102 passes data packet to channel switching device 101 by I_NNI, and data packet enters the third layer switch 211 (step 503).

The layer-3 switch 211 switches according to the corresponding relationship between its own port and each node in the network, and selects an appropriate port to forward the data packet (step 504). For a data packet with a clear second-layer destination address, it is directly sent to the corresponding port through the second-layer forwarding module 312; if it cannot be directly forwarded, it is sent to the third-layer routing module 313 for processing, and this module reads the data The third-layer address information of the packet, selects an appropriate route, and fills the corresponding second-layer address information into the data packet, and then forwards the data packet to the second-layer forwarding module 312 for forwarding. And the identification of the path is established. When the data packet with the same destination address enters the switching device again, it can be directly processed by the second-layer forwarding module to improve the switching efficiency. Route generation and maintenance of the Layer 3 routing module is handled by route generation and switching controller 216 . The forwarding does not establish a fixed connection between the source and the destination, and no bandwidth resources are occupied after the forwarding is completed, so the bandwidth can be fully utilized. The routing generation and switching controller 216 can dynamically obtain the network topology by analyzing the data information in the third-layer switch, implement routing selection or block loops, and can monitor the working status of the switch.

After selecting the port to send, the data packet enters E_NNI through physical layer processing and conversion of level converter 214, or enters I_NNI through physical layer processing and internal level converter 215, or enters OSC through photoelectric converter 213, Carry out corresponding transmission (step 505). Subsequently, the data packet is sent out through OSC or NNI (step 506). The transmitted data packet enters the channel switching device of the next node, and is switched again (step 507). After one or more transmissions and exchanges of the above steps, the data packet reaches the destination device (step 508). The target device may be a control device or a network management server.

Hereinafter, the present invention will be described in detail through specific embodiments. Please refer to FIG. 6 , which is a system structure diagram of the first embodiment of the optical monitoring channel information transmission of the present invention. At the same time, the optical fiber multiplexing method and the DCN network are used to transmit the information of the optical monitoring channel.

As shown in the figure, the optical monitoring channel information between different network elements can be transmitted through the main channel MPI, that is, the optical cable between network elements, or can be transmitted through the data communication network DCN through the network interface NNI. The Ethernet electrical interfaces 610 and 6101 in the figure correspond to the E_NNI shown in FIG. 1 , and the interfaces are respectively connected to the DCN and the network management workstation 609 through Ethernet cables. The IP three-layer switching device 601 corresponds to the channel switching device 101, and the on-board electrical interface 611 of the device is connected to the network element control processing unit 602 through the backplane electrical connection, and the network element control processing unit 602 corresponds to the control device 102 in FIG. 1 . The backplane electrical connection corresponds to I_NNI. In practical applications, a standard Ethernet electrical interface can also be used to implement I_NNI. The network element control processing unit 602 manages the service equipment 604 in the network element through a serial bus, and the bus corresponds to CI. The multiplexing and demultiplexing device 603 is the multiplexing and demultiplexing device 103 , and the service device 604 in the network element corresponds to other optical service devices 104 in FIG. 1 . Wherein, the multiplexer/demultiplexer device 603 is connected to main optical path interfaces of other network elements through optical cables.

Fig. 7 is a system structure diagram of another embodiment of the optical monitoring channel information transmission of the present invention. In this example, the optical monitoring channel information between network elements is only transmitted through the main channel MPI, that is, it is transmitted only through optical cables between network elements by using optical fiber multiplexing. In the figure, the electrical Ethernet interface 710 corresponds to E_NNI, and is connected to the network management workstation 709 through an Ethernet cable. The IP three-layer switching device 701 corresponds to the channel switching device, and the device is connected to the network element control processing unit 702 through the in-board electrical interface 711 and the backplane electrical connection. The network element control processing unit 702 corresponds to the control device 102 in FIG. 1 . The backplane electrical connection corresponds to I_NNI. In practical applications, a standard Ethernet electrical interface can also be used to implement the I_NNI. The network element control processing unit 702 manages the service equipment 704 in the network element through a serial bus, and the serial bus corresponds to CI. The multiplexing and demultiplexing equipment corresponds to the multiplexing and demultiplexing device 703 , and the service equipment 704 in the network element corresponds to other optical service devices 104 . Wherein, the multiplexer/demultiplexer device 703 is connected to main optical path interfaces of other network elements through optical cables.

Fig. 8 is a system structure diagram of another embodiment of the information transmission of the optical monitoring channel of the present invention. In this example, the optical monitoring channel information between network elements is not transmitted through the main channel MPI, but only connected to the data transmission network DCN through an Ethernet cable. The Ethernet electrical interfaces 810, 8101, 8102 in the figure correspond to E_NNI, and are respectively connected to the network management workstation 809 and the data transmission network DCN through Ethernet cables. The IP three-layer switching device 801 corresponds to the channel switching device 101, and the device is connected to the network element control processing unit 802 through the on-board electrical interface 811 and the backplane electrical connection. The network element control processing unit 802 corresponds to the control device 102 in FIG. 1 . The backplane electrical connection corresponds to I_NNI. In practical applications, the I_NNI can also be realized by using a standard Ethernet electrical interface. The network element control processing unit 802 manages the service equipment 804 in the network element through a serial bus, and the serial bus corresponds to CI. The multiplexing/demultiplexing device 803 corresponds to the multiplexing and demultiplexing device 103 , and the service device 804 in the network element corresponds to other optical service devices 104 .

Fig. 9 is an embodiment where the channel switching device is simplified as a second-layer switch. The third layer switch 211 is replaced by the second layer switch 911, the routing generation and switching controller 216 is replaced by the spanning tree protocol 916, the physical layer information preprocessor 212 is corresponding to the Ethernet physical layer interface circuit 912, and the optical transceiver 913 is corresponding to the photoelectric Converter 213 , level shifting and isolation circuits 914 , 915 correspond to level shifter 214 and internal level shifter 215 . The signal 0 via the OSC is a 100Base-FX optical signal, which is converted into an electrical signal by the optical transceiver 913, then processed by the Ethernet physical layer interface circuit 912, and converted into an IP data packet, which is provided to the second layer switch 911 for switching. The destination MAC address in the data packet is exchanged, and the exchanged data packet is sent out from each port of the switch. The switching of switches is controlled by Spanning Tree Protocol 916 to avoid loops. And it can automatically adapt to the change of the topology of the network.

Fig. 10 is a structural diagram of an embodiment in which the channel switching device adopts a layer-3 switch. The IP three-layer switch 1011 corresponds to the third-layer switch 211, the dynamic routing protocol 1016 corresponds to the routing generation and switching controller 216, the Ethernet physical layer interface circuit 1012 corresponds to the physical layer information preprocessor 212, and the optical transceiver 1013 corresponds to the photoelectric converter 213 , the level conversion and isolation circuit 1014 corresponds to the level converter 214 , and the internal level conversion circuit 1015 corresponds to the internal level converter 215 . The signal 0 via the OSC is a 100Base-FX optical signal, which is converted into an electrical signal by the optical transceiver 1013, then processed by the Ethernet physical layer interface circuit 1012, converted into an IP data packet, and provided to the IP layer 3 switch 1011 for switching. For data packets whose destination and source are in the same network segment, the switch switches according to the destination MAC address in the data packet, while for data packets of different network segments, it switches according to the routing table according to the IP address of the data packet, and the exchanged data The packets are then sent out from each port of the switch. The routing table of the switch is generated and maintained by the dynamic routing protocol 1016 .

FIG. 11 is a structural diagram of an embodiment of a layer 3 switching device 211 . Ports 1101 , 1102 , and 1103 correspond to ports 301 , 302 , and 303 , the Ethernet Layer 2 forwarding module 1104 corresponds to the Second Layer forwarding module 312 , and the IP Layer 3 routing module 1105 corresponds to the Third Layer routing module 313 . If the Ethernet packet from the port provides the destination data link layer address, it will be directly forwarded by the Ethernet two-layer forwarding module 1104; if the data link layer address of the default gateway is provided, it will be forwarded to the IP three-layer routing module 1105 processing. The IP layer 3 routing module 1105 selects an appropriate route according to the routing table according to the layer 3 destination address provided by the data packet, regenerates the destination address information of the data packet, and then sends it to the Ethernet layer 2 forwarding module 1104 for forwarding. And establish the corresponding relationship between the address of the port, and then the data packet with this address will be directly forwarded at the second layer.

Fig. 12 is a structural diagram of an embodiment of the control device. The UART communication interface 1223 corresponds to the data transceiver 423, the CPU 1222 corresponds to the data processor 422, and the TCP/IP protocol and the Ethernet interface 1221 form a data encapsulation and decapsulation device 421, the serial bus corresponds to CI, and the Ethernet cable corresponds to I_NNI. S represents the monitoring information from the device and the control information to the device, and P represents the data packet transmitted between the channel switching device and the control device.

FIG. 13 is a flowchart of an embodiment of the implementation method in FIG. 5 . Based on the channel exchange device shown in Figure 2 and the control device shown in Figure 10, the process of information transmission using the general method shown in Figure 5 is described as follows:

Other network elements transmit OSC information to the control device 102 of the local network element through the CI, and the control device 102 first performs data collection and processing steps, and the UART communication interface 1223 receives the data from the CI and submits it to the CPU for processing to generate information to be transmitted ( Step 1301). Subsequently, the control device 102 performs data conversion, the information is processed by the TCP/IP protocol, the information is added with information such as address and verification, and then processed by the bottom layer of the Ethernet, and converted into an Ethernet data packet (step 1302). When the source and destination are on the same network segment, obtain the source MAC address through the ARP packet, and then fill in the data packet. When the source and destination are not in the same network segment, fill in the MAC address of the default gateway.

The Ethernet data packet passes through the Ethernet interface, undergoes level conversion and physical layer processing, and enters an IP layer-3 switch (step 1303).

The IP three-layer switch switches according to the corresponding relationship between its own port and each node in the network, and selects the appropriate port to forward the data packet. When the MAC address in the data packet satisfies the condition of direct forwarding, it is directly forwarded to the corresponding port through the Layer 2 forwarding module. If the MAC address corresponds to the default network management, it will be sent to the layer-3 routing module. The three-layer routing module selects a suitable route according to the IP address of the data packet and according to the routing table, and then regenerates the address information of the data packet. Then send the data packet back to the Layer 2 forwarding module for forwarding. The routing table of the IP three-layer switch is generated and maintained by a dynamic routing protocol (step 1304).

The data packet is sent to the corresponding port of the IP three-layer switch, and enters the E_NNI through the level converter; or enters the OSC through the photoelectric converter for data transmission (step 1305). The data packet is sent out through OSC or NNI (step 1306). The data packet enters the channel switching device of the next node, and switches again (step 1307). After the above one or more exchanges, the data packet reaches the destination device. The device can be a control device or a network management server. In case the destination device cannot be found in the entire network, the data packet is discarded (step 1308).

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of patent protection of the present invention, and do not exclude the use of other embodiments embodying the design solutions of the present invention. All equivalent changes made to the present invention are included in the protection scope of the present invention.

Claims (12)

1. A channel switching device for realizing the information transmission of the optical monitoring channel, the device is connected with the control device through the internal network interface, connected with the data transmission network and the network management server through the external network interface, and multiplexing and demultiplexing through the optical monitoring channel The devices are connected, and it is characterized in that the channel switching device further includes: A photoelectric converter, used to receive the optical monitoring channel information from the optical monitoring channel, convert it into an electrical signal and transmit it to the physical layer information preprocessor; A level converter, used to receive the optical monitoring channel information from the external network interface, perform level conversion and isolation on it, and transmit it to the physical layer information preprocessor; An internal level converter, used to receive the optical monitoring channel information from the control device through the internal network interface and transmit it to the physical layer information preprocessor; The physical layer information preprocessor is used to receive the optical monitoring channel information from the photoelectric converter, level converter or internal level converter, and transmit it to the switch after decoding and regeneration; The switch is a layer-3, layer-4 or layer-7 switch, which is used to select a route according to the received address information in the optical monitoring channel information, to switch or forward, and to forward when the address information has a second-layer destination address , when the address information does not have the second-level destination address, set the corresponding second-level destination address according to the route generation and routing information provided by the switch controller, and forward; A route generating and exchanging controller, connected to the switch, is used to generate and maintain routing information for the switch. 2. The device according to claim 1, wherein the layer-3 switch further comprises: a port, configured to receive data processed by the physical layer information preprocessor; A second-layer forwarding module, connected to the port, for forwarding data having a second-layer destination address among the data processed by the physical layer information preprocessor; The third-layer routing module is connected with the second-layer forwarding module, and is used for generating and switching the data provided by the switching controller for the data that does not have the second-layer destination address among the data processed by the physical layer information preprocessor Routing information, set the corresponding second-level destination address, and hand it over to the second-level forwarding module for forwarding. 3. The system according to claim 1 or 2, wherein the physical layer information preprocessor is an Ethernet physical layer interface circuit, and the third layer switch is an IP layer three switch. 4. A system for realizing the information transmission of the optical monitoring channel by means of switching, including a channel switching device for realizing the information transmission of the optical monitoring channel, the channel switching device is connected with the control device through the internal network interface, and connected with the data transmission network and the network management through the external network interface The server is connected, and is connected with the multiplexing and demultiplexing device through the optical monitoring channel, and the control device is connected with the multiplexing and demultiplexing device through the optical transmission equipment control monitoring interface, and it is characterized in that the channel switching device includes : A photoelectric converter, used to receive the optical monitoring channel information from the optical monitoring channel, convert it into an electrical signal and transmit it to the physical layer information preprocessor; A level converter, used to receive the optical monitoring channel information from the external network interface, perform level conversion and isolation on it, and transmit it to the physical layer information preprocessor; The internal level converter is used to receive the optical monitoring channel information from the control device through the internal network interface and transmit it to the physical layer information preprocessor; The physical layer information preprocessor is used to receive the optical monitoring channel information from the photoelectric converter, level converter or internal level converter, and transmit it to the switch after decoding and regeneration; The switch is a layer-3, layer-4 or layer-7 switch, which is used to select a route according to the received address information in the optical monitoring channel information, to switch or forward, and to forward when the address information has a second-layer destination address , when the address information does not have the second-level destination address, set the corresponding second-level destination address according to the route generation and routing information provided by the switch controller, and forward; a route generation and exchange controller, connected to the switch, for generating and maintaining routing information for the switch The control device, for the data with the second layer destination address, fills the second layer destination address in the data format, and for the data without the second layer destination address, fills the address corresponding to the third layer routing module in the data format . 5. The system according to claim 4, wherein the third layer switch further comprises: a port, configured to receive data processed by the physical layer information preprocessor; A second-layer forwarding module, connected to the port, for forwarding data having a second-layer destination address among the data processed by the physical layer information preprocessor; The third-layer routing module is connected with the second-layer forwarding module, and is used for generating and switching the data provided by the switching controller for the data that does not have the second-layer destination address among the data processed by the physical layer information preprocessor Routing information, set the corresponding second-level destination address, and hand it over to the second-level forwarding module for forwarding. 6. The system according to claim 4, wherein the control device further comprises: A data transceiver, connected to the control and monitoring interface of the optical transmission equipment, for information transmission; A data processor, connected to the data transceiver, for processing data from the control and monitoring interface of the optical transmission equipment; The data encapsulation and decapsulation device is used for encapsulating the data processed by the data processor into a format recognizable by the channel switching device, and then sending it to the channel switching device through the internal network interface. 7. The system according to claim 6, wherein the data encapsulation and decapsulation device is also used to encapsulate the second layer destination address in its data format for the data with the second layer destination address, and to The data without the second-layer destination address encapsulates the address of the third-layer routing module in its data format. 8. system as claimed in claim 6, is characterized in that, described physical layer information preprocessor is an Ethernet physical layer interface circuit, and described third-layer switch is an IP three-layer switch, and described data transceiver It is a UART communication interface, the data processor is a CPU, and the data encapsulation and decapsulation device is an Ethernet interface cooperating with TCP/IP. 9. A method for implementing optical monitoring channel information transmission by means of switching, used in a system for implementing optical monitoring channel information transmission by means of switching, characterized in that it comprises the following steps: The third-layer switch receives the optical monitoring channel information, and selects a suitable route to forward the optical monitoring channel information according to the corresponding relationship between its own port and each node in the network; For the optical monitoring channel information with the second layer destination address, directly send it to the corresponding port; For the optical monitoring channel information that does not have a second-layer destination address, the third-layer switch reads the third-layer address information in the optical monitoring channel information, selects an appropriate route, and provides the information for the optical monitoring channel information Add the corresponding layer-2 destination address and forward it to the corresponding port. 10. The method according to claim 9, wherein the layer 3 switch further comprises before receiving the optical monitoring channel information: Step 11, the control device receives and processes the information of the optical monitoring channel, and determines the information to be sent; Step 12: Encapsulate the information to be sent into a format recognizable by the channel switching device, and then send it to the channel switching device through the internal network interface. 11. The method of claim 10, further comprising in step 12: Judging whether the information of the optical monitoring channel includes the second layer destination address, if so, encapsulating the second layer destination address in its data format, if not, encapsulating the third layer destination address in the third layer switch in its data format The address of the layer routing module. 12. The method according to claim 9, wherein forwarding the information specifically comprises: The optical monitoring channel information is forwarded to the optical monitoring channel or the network interface, and transmitted through the optical monitoring channel or the network interface.

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