WO2008009188A1

WO2008009188A1 - A device of realizing optical supervisory channel information transmission and a system and method thereof

Info

Publication number: WO2008009188A1
Application number: PCT/CN2007/000682
Authority: WO
Inventors: Xiaoning Sha; Linfeng Wang; Hang Dai; Da Xie
Original assignee: Zte Corporation
Priority date: 2006-07-13
Filing date: 2007-03-02
Publication date: 2008-01-24
Also published as: CN1889396B; CN1889396A

Abstract

A device of realizing optical supervisory channel information transmission and a corresponding system and method are disclosed; the said device comprises: an optoelectronic converter, a level converter, an internal level converter, a physical layer information preprocessor, a switch of any layer from layer 2 to layer 7, and a route generating and switching controller; the said system comprises: a channel switching device, a controlling device, a multiplexing/demultiplexing device; the method includes: the layer 3 switch receives the optical supervisory channel information, then according to the correspondence of its own port and each nodes in the network, the switch selects a suitable route to transmit the said information. The present invention does not establish a fixed link between the source and the destination, after finishing the transmission, the bandwidth resource will not be consumed anymore so that the bandwidth resource can be fully utilized. At the same time, a multi-layer switching technique is applied by the invention, therefore, the bandwidth resource provided by the system can be further employed to dynamically adapt to the change of the network topology.

Description

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

The present invention relates to an apparatus, system and method for information transmission in the field of data exchange, and more particularly to an apparatus, system and method for information exchange of optical monitoring channels in a WDM system. Background technique

With the development of WDM (Wavelength Division Multiplexer) systems 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 complicated. This requires that the data channel of the network management information must provide sufficient bandwidth, strong routing capabilities, and the ability to automatically adapt to network topology changes.

The development of optical transmission systems provides higher bandwidth for the delivery of network management information. The WDM device provides an OSC (Optical Supervisory Channel) that uses a dedicated wavelength to transmit information such as network management and business calls. According to the implementation method, it can be divided into two modes: in-band and out-of-band. In-band mode, 0SC can obtain the amplification of optical amplifier, but 0SC will be affected by the failure of optical amplifier. In the out-of-band mode, 0SC does not pass the optical amplifier. Reduce the transmission rate in exchange for higher receiving sensitivity, usually at a rate of 2 Mbit/s. Recently, due to the rapid development of optical devices, higher sensitivity optical devices have emerged, enabling an out-of-band 0SC approach with rates up to 155 MBit/s. In this case, the network management information processing system is designed to take full advantage of the bandwidth advantage of the optical transmission system.

In the existing optical transmission system, the network management information transmission channel is implemented by a conventional circuit switching method. The general system structure of this type of method is shown in Figure 1. It is mainly composed of channel switching device 101, control device 102, multiplexing demultiplexing device 103, other optical service devices 104, and various information channels (ECC (Logical Data Channel). DCN (data communication network), 0SC, etc. constitutes. In the figure, the control device manages the multiplexing demultiplexing device 103 and other optical service devices 104 through CI (optical transmission device control monitoring interface); and the control device 102 and the channel switching device 101 pass through I-I (internal network interface) Implementing the interaction; the channel switching device 101 is responsible for processing various types of data from the OSC, E-Li I (external network interface), I-Li I; logic between channel switching devices of each network element The link is ECC, which can be implemented by an OSC that is connected to the MPI (Master Channel Interface) or E_NNI that is connected to the DCN.

Existing devices of this type use a conventional circuit switching method to implement a channel switching device. The problem with this is that circuit switching is connection-oriented. Once the connection is established, regardless of whether or not data is being transmitted, it must occupy a certain bandwidth and cannot fully utilize the bandwidth resources. Moreover, the connection method is relatively fixed. Each time the connection is changed, the connection must be disconnected and the connection is established. The limitation is to adapt to the flexible network topology, and it is not conducive to the expansion of the exchange capacity.

In order to make full use of bandwidth, a technology for applying Ethernet Layer 2 switching to optical monitoring channels has recently appeared. The general structure of the technique is still similar to that of Figure 1. However, the channel switching device 101 is implemented using an Ethernet Layer 2 switch. Thanks to the Ethernet switching technology, the solution can achieve 100 Mbit/s or higher bandwidth in the optical monitoring channel. However, since it works at the second layer, the exchange method is implemented based on the data link layer address of each node, and does not have a routing function. For the switch, if the source node cannot provide the data link layer address of the forwarded destination node, the broadcast packet must be used to obtain the destination address. This will reduce bandwidth and cause broadcast storms. In the case of complex network architectures and changes, software protocols such as spanning tree protocols are used to suppress network storms and adapt to changes in network topology with poor flexibility. At the same time, the scalability is also poor because it cannot handle data exchange between different IP subnets.

In this case, a three-layer switching technique or a higher layer switching technique is a better choice. The Layer 3 switching technology is named after the third layer in the 0SI seven-layer network standard model. The Layer 3 switching introduces the routing concept on the basis of Layer 2 switching, which can effectively solve the problem that the Layer 2 switched broadcast domain is too large and cannot handle differently. Subnet defects, while retaining the advantages of Layer 2 switching high forwarding efficiency. On the other hand, the TCP/IP protocol in modern network management has been widely used. The TCP/IP protocol is flexible and open, and these advantages can be fully exploited with Layer 3 switching that handles IP protocols.

In addition, in this case, the use of multilayer switching technology is also a better choice. The multi-layer switching technology refers to a technology that exchanges at different levels based on the exchange of data link layers according to the 0SI network model. Multilayer switching technologies include Layer 2 switching, Layer 3 switching, and the recent emergence of Layer 4 switching and Layer 7 switching. At present, there are more applications of Layer 3 switching and Layer 2 switching. Multi-layer switching is a kind of packet switching, which is efficient, stable, easy to expand, etc. Information channel used to build network management.

Summary of the invention

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method and system for implementing optical monitoring channel information transmission by using an exchange method to overcome the shortcomings of the prior art for utilizing insufficient channel bandwidth and connecting the mechanical.

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

a photoelectric converter for receiving information of the optical monitoring channel from the optical monitoring channel, converting the electrical signal into an electrical signal and transmitting the signal to the physical layer information preprocessor;

a level shifter for receiving optical monitoring channel information from the external network interface, level converting and isolating and transmitting to the physical layer information preprocessor;

An internal level shifter for receiving optical monitoring channel information from the control device through the internal network interface and transmitting the information to the physical layer information preprocessor;

The physical layer information preprocessor is configured to receive optical monitoring channel information from the photoelectric converter, the level shifter or the internal level shifter, and perform processing of decoding and regeneration, and then transmit the information to the switch;

The switch is a switch of any one of the second layer to the seventh layer; and is configured to select a route, exchange or forward according to the address information in the received optical monitoring channel information;

A route generation and exchange controller is coupled to the switch for generating and maintaining routing information for the switch.

Further, the switch is a layer 3 switch, or a layer 4 switch, or a layer 7 switch.

Further, the layer 3 switch further includes:

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

a second layer forwarding module, configured to be connected to the port, configured to forward data that has a second layer destination address in the data processed by the physical layer information preprocessor; a third layer routing module, configured to be connected to the second layer forwarding module, configured to provide, according to the route generation and exchange controller, data that does not have a second layer destination address in the data processed by the physical layer information preprocessor The routing information is set to the corresponding second layer destination address, and is forwarded by the second layer forwarding module.

Further, the physical layer information preprocessor is an Ethernet physical layer interface circuit, and the third layer switch is an IP layer switch.

The invention also provides a system for realizing information transmission of an optical monitoring channel by using an exchange method, comprising a channel switching device for realizing information transmission of an optical monitoring channel, the device is connected to the control device through an internal network interface, and through an external network interface and a data transmission network And the network management server is connected, and is connected to the multiplexing demultiplexing device through the optical monitoring channel, and the control device is connected to the multiplexing demultiplexing device through the optical transmission device control monitoring interface, wherein the channel switching device is The method further includes: a photoelectric converter, configured to receive information of the optical monitoring channel from the optical monitoring channel, convert the electrical signal into an electrical signal, and transmit the information to the physical layer information preprocessor;

An internal level shifter is configured to receive optical monitoring channel information from the control device via the internal network interface and transmit the information to the physical layer information preprocessor;

The switch is a switch of any one of the second layer to the seventh layer, and is configured to select a route, exchange or forward according to the address information in the received optical monitoring channel information;

Further, the layer 3 switch further includes:

a port, configured to receive data processed by the physical layer information preprocessor; The second layer forwarding module is connected to the port, and is configured to forward data that has a second layer destination address in the data processed by the physical layer information preprocessor;

The third layer routing module is connected to the second layer forwarding module, and is configured to provide data of the second layer destination address in the data processed by the physical layer information preprocessor according to the route generation and exchange controller. The routing information is set to the corresponding second layer destination address, and is forwarded by the second layer forwarding module.

Further, the control device further includes:

a data transceiver connected to the optical transmission device control monitoring interface for information transmission; a data processor connected to the data transceiver for processing data of the optical transmission device control monitoring interface ;

And a data encapsulation and decapsulator for encapsulating data processed by the data processor into a format recognizable by the channel switching device, and then sent to the channel switching device through an internal network interface.

Further, the data encapsulation and decapsulator is further configured to: encapsulate data of a second layer destination address in data format of the data having the second layer destination address, and data of the destination address not having the second layer in the data format The address of the Layer 3 routing module encapsulated in the data format.

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

The present invention also provides a method for implementing information transmission of an optical monitoring channel by using an exchange method, and a system for implementing information transmission of an optical monitoring channel by using an exchange method, which is characterized in that the method comprises the following steps:

The Layer 3 switch receives the optical monitoring channel information, and selects a suitable route to forward the information according to the corresponding relationship between the port and each node in the network.

Further, the method further includes:

The information about the optical monitoring channel that has the destination address of the second layer is directly sent to the corresponding port; and the information about the optical monitoring channel that does not have the destination address of the second layer, the third layer switch The third layer address information in the optical monitoring channel information is read, a suitable route is selected, and a corresponding second layer destination address is added to the optical monitoring channel information, and forwarded to the corresponding port.

Further, before the step of claim 1, the method further includes:

Step 11: The control device receives the information of the optical monitoring channel and performs processing to determine information that needs to be sent;

Step 12: Encapsulate the information that needs to be sent into a format that can be recognized by the channel switching device, and then send the information to the channel switching device through an internal network interface.

Further, step 12 further includes:

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

Further, after the step, the method further includes:

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

The present invention does not establish a fixed connection between the source and the destination, and the bandwidth resource is no longer occupied after the forwarding is completed, so that the bandwidth can be fully utilized. At the same time, the multi-layer switching technology can make full use of the bandwidth provided by the system and dynamically adapt to changes in the network topology. Drawing fan

Figure 1 is a general implementation of information transmission of optical monitoring channels;

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

Figure 3 is a functional structural diagram of a layer 3 switch;

Figure 4 is a functional block diagram of the control device;

Figure 5 is a flow chart for completing an information transfer;

6 is a system structural diagram of an embodiment of optical monitoring channel information transmission;

7 is a system structural diagram of an embodiment of optical monitoring channel information transmission;

Figure 8 is a system configuration diagram of an embodiment of optical monitoring channel information transmission; Figure 9 is a structural diagram of an embodiment of a channel switching device;

Figure 10 is a structural diagram of an embodiment of a channel switching apparatus employing a layer 3 switch; Figure 11 is a block diagram of an embodiment of a layer 3 switching apparatus;

Figure 12 is a block diagram showing an embodiment of a control device;

Figure 13 is a flow diagram of one embodiment of an implementation of the present invention. Preferred embodiment of the invention

The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

FIG. 1 is a system structural diagram for realizing information transmission of an optical monitoring channel. On the basis of the general structure, the present invention improves the internal structure of the system device, and uses multi-layer switching technology to realize information transmission of the optical monitoring channel.

FIG. 2 is a functional block diagram of a channel switching device of the present invention. Referring to FIG. 1, the channel switching apparatus 101 includes a layer 3 switch 211, a physical layer information preprocessor 212, a photoelectric converter 213, a level shifter 214, an internal level shifter 215, and a route generation and exchange controller 216. The third layer switch 211 may be a higher layer switch conforming to the 0SI network model, such as a fourth layer switch or a seventh layer switch, and the basic principle thereof is similar to this embodiment. When a signal having optical monitoring channel information is transmitted, the photoelectric converter 213 receives the signal from the optical monitoring channel (0SC) and converts it into an electrical signal, or the level shifter 214 receives the signal from the E_I and performs it. Level shifting and isolation, or internal level shifter 215 receives the signal from 1_Li. 213, 214, and 215 are respectively connected to the physical layer information preprocessor 212, and the physical layer information preprocessor 212 decodes the information from 213, 214, and 215, and processes it to the third layer switch 211. The information from different sources is exchanged and forwarded by the third layer switch. 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 block diagram of the third layer switch 211 in the channel switching apparatus. Each port

301, 302, 303 are for receiving and transmitting data packets from the physical layer information preprocessor 212. If the data packet contains the determined second layer address, it is forwarded directly at the second layer forwarding module 312. For those that cannot be directly forwarded, it is forwarded to the third layer routing module 313 for processing. Layer 3 routing module The block processes the data packet according to the routing information provided by the route generation and exchange controller 216, sets a reasonable second layer address, and forwards it to the second layer forwarding module 312.

Fig. 4 is a diagram showing the functional configuration of the control device 102. The control device 102 includes a data encapsulation and decapsulator 421, a data processor 422 and a data transceiver 423. The data transceiver 423 is connected to the CI and is responsible for processing the transfer of information between the controller 102 and the CI. The data processor 422 is connected to the data transceiver 423. After processing the data of the self CI, the information to be sent is sent to the data encapsulation and decapsulator 421 to be formatted by the channel switching device 101, wherein the data processing is performed. The 422 also needs to determine whether to know the second layer destination address of the transmitted information. If so, the data encapsulation and de-encapsulator 421 fills the second layer destination address directly in the data format. If not known, the data format is padded with the address corresponding to the three-layer routing module. Convert to the packet format that the switching device can operate on. It is then transmitted to the channel switching device 101 via the IJNI. Information from channel switching device 101 is then passed through data encapsulation and decapsulator 421 to a format that data processor 422 can process.

It can be seen from the structure of Fig. 3 and Fig. 4 that the data is handed over to the routing device of the third layer only when the data cannot be directly transferred to the layer 2 layer. And it can be forwarded multiple times after one route processing, taking into account high bandwidth and flexibility. In some cases, it is also possible to simplify the three-layer module and form a two-layer switching system for the single unit, which greatly saves costs.

The above is the system structure for realizing the information transmission of the optical monitoring channel by using the switching technology, and the method for transmitting the information of the optical monitoring channel based on the above system structure of the present invention is described below with reference to the accompanying drawings.

FIG. 5 is a flow chart showing the transmission of optical monitoring channel information from the control device to the channel switching device, which is described below with reference to FIG. 1 to FIG. 4:

Step 501: The 0SC information is transmitted from the other network element to the control device 102 of the local network element through the CI, and 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 transmits and receives data through the data. The 423 receives the data from the CI and processes it.

Step 502: Subsequently, the data processor 422 in the control device 102 transmits the information to be transmitted to the data encapsulation and decapsulator 421, and simultaneously determines whether the destination second layer address is included, which is referred to as the second layer destination address. If included, the second layer destination address is directly filled in the data format. If not, the data format is filled with the address corresponding to the third layer routing module. The conversion to channel switching device 101 can identify the packet format of the operation. Step 503: The control device 102 transmits the data packet to the channel switching device 101 through the I-Li 1, and the data packet passes through the processing of the internal level shifter 215 and the physical layer information pre-processor 212 in the channel switching device 101, and then enters the Layer 3 switch 211.

Step 504: The third layer switch 211 exchanges according to the correspondence between the own port and each node in the network, and selects an appropriate port to forward the data packet.

For the data packet with the clear destination address of the second layer, 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 the module reads the data. The third layer address information of the packet is selected, and the corresponding second layer address information is filled into the data packet, and then the data packet is transferred to the Layer 2 forwarding module 312 for forwarding. And the identification of the path is established. When the data packet with the address of the same department enters the switching device again, it can be directly processed by the second layer forwarding module, thereby improving the efficiency of the exchange. Route generation and maintenance of the Layer 3 routing module is handled by the Route Generation and Switching Controller 216. This forwarding does not establish a fixed connection between the source and destination. After the forwarding is completed, the bandwidth resources are no longer occupied, so the bandwidth can be fully utilized. The route generation and switching controller 216 can dynamically obtain the network topology by parsing the data information in the layer 3 switch, implement routing or blocking loops, and can monitor the working state of the switch. Step 505: After selecting the port to be sent, the data packet is converted into E-Li I through physical layer processing and level converter 214 conversion, or enters I-Li through physical layer processing and internal level shifter 215. Or enter the OSC through the photoelectric converter 213, and perform corresponding transmission.

Step 506: Subsequently, the data packet is transmitted through 0SC or MN.

Step 507: The transmitted data packet enters the channel switching device of the next node, and is exchanged again.

Step 508: After one or more transmissions and exchanges of the above steps, the data packet reaches the destination device. In other words, when the node to which the transmitted data packet enters is the destination device, the data packet arrives at the destination device, otherwise it returns to step 501, that is, the exchange is performed again.

The device can be either a control device or a network management server.

The present invention will be described in detail below through specific embodiments. Please refer to FIG. 6 is a system structural diagram of a first embodiment of optical monitoring channel information transmission according to the present invention. At the same time, fiber multiplexing and DCN are adopted. The network transmits optical monitoring channel information.

As shown in Figure 6, the optical monitoring channel information between different network elements can be transmitted through the main channel MPI, that is, the optical cable between the network elements, or through the network interface, through the data communication network DCN. The Ethernet electrical interfaces 610 and 6101 in the figure correspond to the E-Li I shown in FIG. 1, and the interfaces are respectively connected to the DCN and the network management workstation 609 through an Ethernet cable. The IP layer switching device 601 corresponds to the channel switching device 101. The intra-board electrical interface 611 of the device is connected to the network element control processing unit 602 through a backplane electrical connection. The network element control processing unit 602 corresponds to the control device 102 of FIG. The backplane electrical connection corresponds to I-Li I. In practical applications, a standard Ethernet electrical interface can also be used to implement I-I. The network element control processing unit 602 manages the service device 604 in the network element through the serial bus, and the bus corresponds to the CI. The multiplexer device 603 is the multiplex demultiplexing device 103, and the network device 604 corresponds to the other optical service device 104 in FIG. The multiplexer device 603 is connected to the main optical path of other network elements through an optical cable.

Figure 7 is a system configuration diagram of another embodiment of the optical monitoring channel information transmission of the present invention. The optical monitoring channel information between the network elements in this example is transmitted only through the main channel MPI, that is, only through the optical fiber cable between the network elements. In the figure, the Ethernet electrical interface 710 corresponds to E-Li I, and is connected to the network management workstation 709 through an Ethernet cable. The IP layer switching device 701 corresponds to a channel switching device. The device is connected to the network element control processing unit 702 through an electrical interface 711 and a backplane. The network element control processing unit 702 corresponds to the control device 102 of FIG. The backplane electrical connection corresponds to I-I. In practical applications, a standard Ethernet electrical interface can also be used to implement I-I. The network element control processing unit 702 manages the service device 704 in the network element through the serial bus, and the serial bus corresponds to the CI. The multiplexer device corresponds to the multiplex demultiplexing device 703, and the network device 704 corresponds to the other optical service device 104. The multiplexer device 703 is connected to the main optical path of other network elements through an optical cable.

Fig. 8 is a system configuration diagram showing still another embodiment of the optical monitoring channel information transmission of the present invention. In this example, the optical monitoring channel information between the network elements is not transmitted through the primary channel MPI, but is transmitted only through the Ethernet cable to the data transmission network DCN. The Ethernet electrical interfaces 810, 8101, and 8102 in the figure correspond to the E-I, and are respectively connected to the network management workstation 809 and the data transmission network DCN through an Ethernet cable. The IP layer switching device 801 corresponds to the channel switching device 101. The device is connected to the network element control processing unit 802 through the intra-board electrical interface 811 and the backplane electrical connection. The network element control processing unit 802 corresponds to Control device 102 in FIG. The backplane electrical connection corresponds to I-Li. In practical applications, I-Li can also be implemented using a standard Ethernet electrical interface. The network element control processing unit 802 manages the service device 804 in the network element through the serial bus, and the serial bus corresponds to the CI. The multiplexer/demultiplexer device 803 corresponds to the multiplex demultiplexing device 103, and the intra-network cell service device 804 corresponds to the other optical service device 104.

Figure 9 is an embodiment of a channel switching device being trunked into a second layer switch. Layer 3 switch

211 is replaced with the second layer switch 911, and the route generation and exchange controller 216 is replaced by the spanning tree protocol 916. The Ethernet physical layer interface circuit 912 corresponds to the physical layer information preprocessor 212, and the optical transceiver 913 corresponds 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 0SC is a 100Base-FX optical signal, which is converted into an electrical signal by the optical transceiver 913, and then processed by the Ethernet physical layer interface circuit 912, converted into an IP data packet, and provided to the second layer switch 911 for exchange, according to the switch. The destination MAC address in the packet is exchanged, and the exchanged packet is sent out from each port of the switch. Switch switching is controlled by Spanning Tree Protocol 916 to avoid loops. And it can automatically adapt to the changes in the topology of the network.

Figure 10 is a block diagram showing an embodiment of a channel switching apparatus employing a layer 3 switch. IP layer switch

1011 corresponds to the third layer switch 211, the dynamic routing protocol 1016 corresponds to the route generation and exchange 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, level shifting The isolation circuit 1014 corresponds to a level shifter 214, and the internal level shift circuit 1015 corresponds to an internal level shifter 215. The signal 0 via 0SC is a 100Base-FX optical signal, which is converted into an electrical signal by the optical transceiver 1013, and then processed by the Ethernet physical layer interface circuit 1012, converted into an IP data packet, and provided to the IP layer switch 1011 for exchange. For the data packets of the same network segment with the destination and source, the switch exchanges the destination MAC address in the data packet, and the data packets of different network segments are exchanged according to the IP address of the data packet according to the routing table, and the exchanged data is exchanged. The packet is sent out from each port of the switch. The switch's routing table is generated and maintained by the Dynamic Routing Protocol 1016.

11 is a block diagram showing an embodiment of a layer 3 switch 211. The ports 1101, 1102, and 1103 correspond to the ports 301, 302, and 303, the Ethernet layer 2 forwarding module 1104 corresponds to the second layer forwarding module 312, and the IP layer 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, the Ethernet Layer 2 forwarding module 1104 Direct forwarding; if the data link layer address of the default gateway is provided, go to the IP layer routing module 1105 for processing. The IP layer routing module 1105 selects an appropriate route according to the routing table according to the third layer destination address provided by the data packet, and regenerates the destination address information of the data packet, and then forwards it to the Ethernet layer 2 forwarding module 1104 for forwarding. And establish the corresponding relationship of the port address, and then the data packet of the address will be directly forwarded at the second layer.

FIG. 12 is a block diagram of an embodiment of the control device 102. 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 constitute a data encapsulation and decapsulator 421, the serial bus corresponds to the CI, and the Ethernet cable corresponds to the I- Should be 1. S denotes monitoring information from the device and control information for the outgoing device, and P denotes a data packet transmitted between the channel switching device and the control device.

Figure 13 is a flow diagram of one embodiment of the method of implementation of Figure 5. Based on the channel switching apparatus shown in FIG. 2 and the control apparatus shown in FIG. 10, the general method shown in FIG. 5 is used for the information transmission process, which is explained as follows:

Step 1301: The other network element transmits the 0SC information to the control device 102 of the local network element through the CI, then the control device 102 first performs data collection and processing steps, and the UART communication interface 1223 receives the data from the CI and processes it by the CPU to generate a transmission. Information.

Step 1302: Subsequently, the control device 102 performs data conversion, and the information is processed by the TCP/IP protocol, and the information is added with information such as an address, a calibration, and the like, and then converted into an Ethernet packet by the underlying processing of the Ethernet. When the source and destination are on the same network segment, obtain the MAC address of the source through the ARP packet, and then fill in the data packet. Fill in the MAC address of the default gateway when the source and destination are not on the same network segment.

Step 1303: The Ethernet packet passes through the Ethernet interface, undergoes level conversion and physical layer processing, and enters the IP layer switch.

Step 1304: The IP layer switch exchanges according to the correspondence between the port and each node in the network, and selects an 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 NMS, it is sent to the Layer 3 routing module. The Layer 3 routing module selects the appropriate route according to the IP address of the data packet according to the routing table and then regenerates the address information of the data packet. The data packet is sent back to the Layer 2 forwarding module for forwarding. The routing table of the IP layer switch is generated and maintained by the dynamic routing protocol. Step 1305: The data packet is sent to the corresponding port of the IP layer switch, and enters E-Li I through a level shifter; or enters the 0SC through the photoelectric converter for data transmission.

Step 1306: The data packet is transmitted through 0SC or MN.

Step 1307: The data packet enters the channel switching device of the next node, and is exchanged again. Step 1308: After one or more of the above exchanges, the data packet reaches the destination device. In other words, when the node to which the transmitted data packet enters is the destination device, the data packet arrives at the destination device, otherwise it returns to step 1301, that is, the exchange is performed again.

The destination device may be a control device or a network management server. In the case where the destination device is not found in the entire network, the packet is discarded.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and does not exclude other embodiments that embody the design of the present invention. All such equivalent changes to the invention are intended to be included within the scope of the invention.

Industrial applicability

The present invention does not establish a fixed connection between the source and the destination, and the bandwidth resource is no longer occupied after the forwarding is completed, so that the bandwidth can be fully utilized. At the same time, the multi-layer switching technology can make full use of the bandwidth provided by the system and dynamically adapt to changes in the network topology.

Claims

Claim

1. A channel switching device for realizing information transmission of an optical monitoring channel, the device is connected to a control device through an internal network interface, connected to a data transmission network and a network management server through an external network interface, and demultiplexed by an optical monitoring channel and a multiplexing The device is connected to the device, and the channel switching device further includes:

a photoelectric converter, configured to receive information of the optical monitoring channel from the optical monitoring channel, convert the electrical signal into an electrical signal, and transmit the information to the physical layer information preprocessor;

2. The apparatus according to claim 1, wherein the switch is a layer 3 switch, or a layer 4 switch, or a layer 7 switch.

3. The apparatus according to claim 2, 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, configured to be connected to the port, configured to forward data that has a second layer destination address in the data processed by the physical layer information preprocessor;

a third layer routing module, configured to be connected to the second layer forwarding module, configured to provide, according to the route generation and exchange controller, data that does not have a second layer destination address in the data processed by the physical layer information preprocessor The routing information is set to the corresponding second layer destination address, and is forwarded by the second layer forwarding module.

The device according to any one of claims 1 to 3, wherein the physical layer information preprocessor is an Ethernet physical layer interface circuit, and the third layer switch is an IP layer switch.

5. A system for implementing optical monitoring channel information transmission by means of switching, comprising a channel switching device for realizing optical monitoring channel information transmission, the device is connected to the control device through an internal network interface, through an external network interface and a data transmission network and a network management server And connected to the multiplex demultiplexing device by the optical monitoring channel, and the control device is connected to the multiplex demultiplexing device by the optical transmission device control monitoring interface, wherein the channel switching device further includes:

a level shifter, configured to receive optical monitoring channel information from the external network interface, level-convert and isolate and transmit to the physical layer information preprocessor;

6. The system of claim 5, wherein the switch is a Layer 3 switch, or a Layer 4 switch, or a Layer 7 switch.

The system of claim 6, wherein the third layer switch further comprises: a port, configured to receive data processed by the physical layer information preprocessor;

a third layer routing module, configured to be connected to the second layer forwarding module, configured to generate, according to the route, data that does not have a destination address of the second layer in the data processed by the physical layer information preprocessor The routing information provided by the switch controller is set, and the corresponding second layer destination address is set and forwarded to the second layer forwarding module.

8. The system of claim 5, wherein the control device further comprises: a data transceiver coupled to the optical transmission device control monitoring interface for information transfer; a data processor, and the a data transceiver connection for processing data of the optical transmission device control monitoring interface;

The system according to claim 8, wherein the data encapsulation and decapsulator is further configured to encapsulate the second layer destination address in the data format of the data having the destination address of the second layer, Data that does not have a destination address of the second layer encapsulates the address of the third layer routing module in its data format.

The system according to claim 5 or 8, wherein the physical layer information preprocessor is an Ethernet physical layer interface circuit, and the third layer switch is an IP layer switch, and the data is sent and received. The device is a UART communication interface, the data processor is a CPU, and the data encapsulation and decapsulator is an Ethernet interface that cooperates with TCP/IP.

11. A method for implementing information transmission of an optical monitoring channel by using an exchange method, which is used in a system for transmitting information of an optical monitoring channel by using an exchange method, and is characterized in that the method comprises the following steps:

The method of claim 11, further comprising:

The information about the optical monitoring channel that has the destination address of the second layer is directly sent to the corresponding port; and the information of the optical monitoring channel that does not have the destination address of the second layer, the third layer switch reads the optical monitoring channel The third layer address information in the information is selected, and a corresponding second layer destination address is added to the optical monitoring channel information, and forwarded to the corresponding port.

13. The method according to claim 11, wherein before the step of claim 1, the method further comprises:

Step 11: The control device receives the information of the optical monitoring channel and processes it to determine that it needs to be sent. Information sent;

The method of claim 13, wherein the step 12 further comprises: determining whether the second layer destination address is included in the optical monitoring channel information, and if so, encapsulating the second layer in the data format The address, if not, encapsulates the address of the Layer 3 routing module in the Layer 3 switch in its data format.

15. The method of claim 11 further comprising the step of claim 11 further comprising:

The information is forwarded to an optical monitoring channel or a network interface and transmitted through an optical monitoring channel or a network interface.