WO2006094430A1

WO2006094430A1 - A route exchange system

Info

Publication number: WO2006094430A1
Application number: PCT/CN2005/000272
Authority: WO
Inventors: Wenhui Cai; Tao Xiong; Chen Wu; Xinghua Li
Original assignee: Zte Corporation
Priority date: 2005-03-07
Filing date: 2005-03-07
Publication date: 2006-09-14

Abstract

A route exchange system includes: at least a service process subsystem for processing a accessing message and forwarding it; at least a central exchange subsystem for exchanging the message between service process subsystems and managing the resource of the whole system; The central exchange subsystem includes: a first transfer device, at least a exchange device and a first control device; The service process subsystem includes: a second transfer device, a user device, a management device and a second control device. Compared to the art, the service process and exchange of the invention separates not only in logical but also in physical position; The separation can realize covering a wide area and managing uniformly, enhance the capability that network manages service and resource, reduce the process of the message, reach the effect of organizing network flatly, improve the operationalization of network, and decrease the cost for transferring the message.

Description

Route switching system

The present invention relates to a routing switching system in the field of communications, and more particularly to a routing switching system for use in packet data routing switching and telecommunications packet data bearer networks. Background technique

At present, the capacity of the router used in data communication has reached the T-bit level, and the switching capacity can meet the application of the future metropolitan or provincial network. In the management of the traffic manager, the number of queues can reach 100. The tens of thousands of levels can also meet the application requirements of the WAN, especially the metropolitan area network. 1 is a schematic structural diagram of an IP backbone network 15 according to the prior art. The backbone network 15 includes a plurality of edge routers 151 and a core router 152, and the edge router 151 is connected to the access network 12. The packet data packet of the sending end enters the backbone network 15 through the access network 12, and the message passes through the multi-hop route of the "edge 151 - core router 152 - edge router 151"" to reach the access of the receiving end. In the network 14, the end-to-end data transmission is completed. This network architecture has two main drawbacks: The network is based on multi-hop packet switching, and the delay of end-to-end data transmission is uncertain, resulting in a decline in network performance. Second, a large number of routers are used in the network. This will result in a network-wide topology becoming a fully interconnected (Mesh) architecture, resulting in end-to-end quality of service (QoS) performance that is more difficult to guarantee.

At present, the bandwidth requirements of IP backbone networks and metropolitan area networks continue to grow at the speed of Super Moore's Law. The current routing switching equipment is basically a multi-rack system with single-rack system or short-distance interconnection. A single network is implemented within the domain. The expansion of the network generally adopts the scheme of adding new nodes. However, in this aspect, the link bandwidth of the entire network does not necessarily meet the requirements of traffic development. More importantly, too many nodes are added, which will seriously increase the complexity of the network topology. Sexuality, the transmission delay and delay jitter of service data cannot be effectively controlled, which is not conducive to the stable operation of the network, and increases the difficulty of network planning and operation and maintenance.

In addition, the network structure of a multi-rack routing switch device based on single-rack or short-distance interconnection also affects the unified management of network resources and system resources. In order to achieve end-to-end QoS control, it is bound to More control protocols need to be introduced to manage network resources, resulting in increased complexity of network management, business resources being occupied by more protocols, and end-to-end service quality issues not being fundamentally resolved. At the same time, due to the lack of unified management of resources, the granularity of business management is rough, and the management of point-to-point (P2P) services cannot be completed.

The Next Generation Network (NGN) puts high demands on the network interworking of the bearer network, the whole network planning, QoS guarantee and manageability. However, the existing routing switching equipment and its networking mode, whether resource management or service management, cannot meet the requirements of NGN for end-to-end QoS broadband performance, full network planning and high manageability. Therefore, there is an urgent need for a new routing switching device to meet the requirements of NGN.

Summary of the invention

The present invention has been made in view of the above technical problems of the prior art, and an object thereof is to provide a new routing switching system to overcome the defects of the prior art routing switching device networking.

The routing switching system of the present invention includes:

At least one service processing subsystem, configured to process the accessed message data and forward the message; at least one central switching subsystem, configured to implement message data exchange between the service processing subsystems, and manage the entire system Resource

The central switching subsystem includes:

a first transmission device, configured to send and receive message data and control interaction with the service processing subsystem

At least one switching device, configured to exchange message data distributed by the first transmitting device; and a first control device, configured to control the switching device to complete exchange of message data; the service processing subsystem includes:

a second transmitting device, configured to send and receive message data and control interaction information with the first transmitting device;

User equipment, used to implement packet processing and exchange processing of the user;

a management device, configured to process a local protocol, and manage resources of the user equipment application; a second control device, configured for network management, and configured to the user equipment and the second transmission Prepare for configuration and supervision.

Preferably, the first control device further includes:

An exchange information control module, configured to control exchange of message data of the switching device; a system state control module, configured to collect and control an operating state of the entire system;

A network resource management module for managing and controlling the planning and allocation of network resources in the system. Preferably, the first control device further includes: a service resource control module, configured to manage planning and allocation of service resources in the system.

Preferably, the first control device further includes: a network management module, configured to manage and collect information of the network.

Preferably, the user equipment further includes:

a packet processing module, configured to perform access control and processing on the packet data received by the external access system, and forward the packet data to the switching processing module, and forward the packet data received from the switching processing module to the external access system;

The switching processing module is configured to perform exchange control on the packet sent by the packet processing module, and forward the packet sent by the second transmitting device to the packet processing module, and simultaneously process the switching signaling. Preferably, the user equipment further includes: a traffic management module, configured to perform queue management and scheduling on the packets sent by the ^=艮文 processing module and the exchange processing module.

Preferably, the route switching system further includes: at least one interface subsystem, connected to the service processing subsystem, for accessing message data.

Compared with the prior art, the system of the present invention is not only logically separated but also separated in physical location. This separation can realize the coverage widening and management unification of the present invention, enhance the network's ability to manage services and resources, reduce the processing of the 4 艮 text, achieve the effect of flat networking, and improve the network. Operationality reduces the cost of packet processing and forwarding. In addition, in the wide area packet data exchange network formed by the present invention, especially in the metropolitan area network, the switching system is no longer a connection between multiple routers, and edge traffic is no longer limited by routers. The link bandwidth can be processed at full line rate and exchanged without blocking in the entire network. Therefore, the performance requirements for network interworking, full network planning, QoS guarantee and manageability required for the bearer network required by NGN, The present invention can achieve good results. The system of the invention can be widely applied in the fields of data communication, wireless communication and the like. DRAWINGS

1 is a connection topology diagram of an IP backbone network in the prior art;

2 is a schematic diagram of a route switching system in accordance with an embodiment of the present invention;

3 is a schematic diagram of a route switching system according to another embodiment of the present invention; FIG. 4 is a schematic diagram of a route switching system according to still another embodiment of the present invention; FIG. Schematic diagram of a wide area network; FIG. ⁶ is a schematic diagram of constructing a higher-level wide area network by using the routing switching system of the present invention as a lower-level device. detailed description

The above and other objects, features and advantages of the present invention will become more <RTIgt;

In order to overcome the defects of the router device and its networking in the prior art, the basic idea of the present invention is: to learn from the open architecture of the "module-to-module-wide, in-module hierarchical control, centralized management" of the program-controlled switchboard, using an open type The multi-module interconnection architecture changes the service processing and switching modules in a single rack or a large-disconnected multi-rack state, and adopts a fully separated and fully interconnected manner in which service processing and center switching are separated and switching modules are separated.

2 is a schematic diagram of a route switching system in accordance with one embodiment of the present invention. As shown in FIG. 2, the route switching system includes a central switching subsystem 20 and a plurality of service processing subsystems ²⁵ , and the central switching subsystem 20 and each service processing subsystem 25 are separately disposed.

The central switching subsystem 20 includes: a first transmitting device 201, and receiving and transmitting message data with the service processing subsystem ²⁵ , transmitting the received message data to the switching device 203 described below, and simultaneously transmitting and receiving the following description. The first control device 202 controls the interaction information; the first control device 202 manages and controls various resources of the entire routing system, and controls the switching device to complete the exchange of the message data, including: generating a data exchange control instruction and Send to the business processing subsystem 25, run protocols such as interconnection or routing, generate and maintain routing tables, collect networks The information is calculated, the routing policy is calculated, the network resource is configured and delivered to the service processing subsystem 25, and the service resource is configured and delivered to the service processing subsystem 25, etc.; at least one switching device 203 performs data according to the instruction of the control device 202. The exchange of message data can be carried out in the form of autonomous routing. That is, when the message data arrives at the switching network, the path between its input and output has been determined, and the exchange delay is determined; it can also be in the form of passive exchange. When the packet data arrives at the switching network, the switching network selects the switching path for the packet according to the current situation, and the switching delay is undeterminable.

The service processing subsystem 25 further includes: a second transmitting device 251, which is mutually transceived with the first transmitting device 201 of the central switching subsystem 20, and performs receiving and transmitting of message data and control interaction information; the user equipment 252, mainly completing the report Processing of access control, message processing, traffic management, and exchange control instructions of the text data; the second control device 253, implementing network management functions for the service processing subsystem 25, including downloading a routing table, distributing a policy, and collecting device status information And reporting, configuring, and supervising the user equipment 252 and the transmitting device 251 of the service processing subsystem 25; the management device 254, performing local protocol processing, and assisting the first control device 202 of the central switching subsystem 20 to perform service resource management, and management User i reserves the resources of the application 252. If possible, the resources of the second transmitting device 251 are also managed.

The service processing subsystem 25 can be located remotely from the central switching subsystem 20 or can be placed close to the central switching subsystem 20.

The working process of the route switching system of this embodiment will be described below. For the sake of clarity, the message data is described separately from the control management information. The service packet data sent by the user of the service provider is accessed by the access device of the existing network through the user equipment 252 of the service processing subsystem 25, and after the packet processing, traffic management, and exchange processing, the packet data is transmitted through the second transmission. The device 251, the first transmitting device 201 is sent to the switching device 203 of the central switching subsystem 20, and the switching device 203 exchanges the message data, and outputs it to the corresponding output service processing subsystem 25 through the first transmitting device 201, and finally Output to the service receiving end user, thereby completing a basic end-to-end service packet data forwarding. For the control management information, after the service message data is accessed to the user equipment 252 of the service processing subsystem 25, the user device 252 forwards the management device 254 and the second control device to the service processing subsystem 25. 253, then through the second transfer device 251. The first transmitting device 201 is uploaded to the first control device 202 of the central switching subsystem 20. After processing and calculation, the first control device 202 of the central switching subsystem 20 distributes the control management information to the service processing subsystem. The second control device 253 and the management device 254 of ²⁵ are then configured by the second control device 253 and the management device 254. Of course, this is only the basic way of centralized control mode, and does not rule out the possibility of control and management plane distributed processing.

In the routing switching system of this embodiment, the service data processing plane, the management plane, and the control plane are separated in a comical manner. The second control device 253 of the service processing subsystem 25, the management device 254, and the first control device 202 of the central switching subsystem 20 cooperate to manage and control various resources of the entire routing switching system. Since the resources of the system are unified management, information such as message exchange control, resource management, and network management generated by the first control device 202 is sent to the service processing subsystem 25, and the data channel and the control management data channel are transmitted. It can be separated on the physical link, that is, it can be transmitted by means of out-of-band transmission, or a unified physical link can be used, that is, transmission by in-band data multiplexing.

Preferably, the routing subsystem of the embodiment may further include an interface subsystem 30 for accessing packet data, which is connected to the service processing subsystem 25 through a link. The interface subsystem 30 can be a collection of various network interfaces, and the link interface with the service processing subsystem 25 can be, for example, Ethernet, SDH, Packet Over SDH (P0S), ATM, etc. The interface can also be a high speed serial bus or a parallel bus.

As can be seen from the above description, the present embodiment uses a full separation and full interconnection method in which the service processing and the central switching are separated, and the switching modules are separated, and the service processing subsystem is distributed to the wide area or the metro area by the function of the transmitting device. It brings huge networking flexibility, greatly simplifies the complexity of the network structure, improves the delay of data forwarding and the determinism of delay jitter, and simplifies the complex network-wide QoS problem to the device QoS problem, improving the end-to-end End QoS performance.

Preferably, the routing switching system may comprise a plurality of central switching subsystems 20 constituting a redundant central switching subsystem in the form of 1: 1, 1+1, n: l or n+1.

Preferably, the central switching subsystem 20 may comprise a plurality of switching devices 203 constituting redundancy in the form of 1:1, 1+1, n: l or n+1.

In the following, combined with the uplink and downlink processing of the packet data, each of the embodiments shown in FIG. 2 The composition is explained in detail.

The packet processed by the routing switching system in the embodiment shown in FIG. 2 is mainly a packet data packet, and the uplink processing procedure of the packet data is as follows.

The message data is accessed in user equipment 252 of service processing subsystem 20. According to the function setting, the user equipment 252 may further include: a message processing module 2523, a traffic management module 2522, and an exchange processing module 2521.

The message data first enters the message processing module 2523. The function of the message processing module 2523 is to perform access control and corresponding processing on the received message data. After the packet processing module 2523 extracts the packet data from the input queue, separates the packet header information, such as the TTL field, the header checksum, the option field, the source address, and the destination address, and then checks whether each field satisfies the standard report. The format of the packet is the IP packet, whether the packet header format is correct, whether fragmentation is required, whether it is a multicast packet, and whether the TTL field is 0 or not. If the check condition is not met, the message is specially marked and handed over as a special message to the second control device 253 of the service processing subsystem 25, if the special message needs to be submitted to the central switching subsystem 20 The first control device 202 processes the second control device 253 of the service processing subsystem 25 for transmission to the first control device 202 of the central switching subsystem 20 in-band or out-of-band. Then, the table data of the message data satisfying the check condition is checked. The message processing module 2523 starts a route lookup process according to a selected route lookup algorithm, and obtains the address information of the next hop according to the destination address of the message. In addition, look-up operations include lookup access control lists (ACLs), other QoS-related calculations, and look-up tables, such as measurements, priority lookups, and tri-color markers. The packet that fails to find the relevant information is discarded, or forwarded to the second control device 253 of the service processing subsystem 25, or sent to the central switching subsystem 20 through the second control device 253 of the service processing subsystem 25. The first control device 203 processes. Finally, the information obtained by the lookup table is added to the packet header, and other corresponding fields are modified, and then the modified new packet header is spliced with the original packet and output to the traffic management module 2522.

In the message processing module 2523, resource tables (such as routing tables, QoS-related tables) are generated and maintained by the management device 254 of the service processing subsystem 25 and the first control device 202 of the central switching subsystem 20. The resource table is synchronized periodically or irregularly.

After the traffic management module 2522, it mainly completes the queue management and adjustment of the message. Degree. First, the traffic management module ²⁵²² all packets buffer management according to certain rules, and according to the result message processing module 2523 calculates, according to the global resource status, policy information to certain rules packets into the queue manager, A queue management algorithm that contains some rules in the queue. Then, according to the global resource status, the message output scheduling between the queues is performed by using a certain rule, and the message is sent to the exchange processing module 2521.

Since the traffic management module 2522 needs to obtain the resource status of the whole system, the traffic management module 2522 manages and schedules a large number of queues, which may be hierarchical. The system-wide resource status obtained by the traffic management module 2522 is managed and configured by the management device 254 of the service processing subsystem 25 and the first control device 202 of the central switching subsystem 20.

The exchange processing module 2521 processes the packet according to the exchange control command issued by the first control device 202 of the central switching subsystem 20. After the switch processing module 2521 receives the message data sent by the traffic management module 2522, the packet is cut into a cell (or directly in the form of a message), and is delivered according to the first control device 202 of the central switching subsystem 20. The exchange control signaling, the exchange packet header is added, and then the message is sent to the second transmission device 251. The switch control command can be delivered directly through the inband link or through the outband control link.

Zi service processing subsystem 251 and the second transfer device 25 of the central exchange subsystem 201 mutually send and receive the first transfer device ²⁰ mainly performs packet data exchange between the received service subsystem 20 and processing subsystem 25 and the center send. The first transmitting device 201 and the second transmitting device 251 may use optical connecting devices or electrical connecting devices to complete the message data and control signals between the central switching subsystem ²⁰ and the service processing subsystem 25. The transmission of the departure. In the long-distance transmission, the transmitting device 201 may be a transmission device such as fiber convergence to complete photoelectric conversion; and may also include functions such as transmission codec, serial/parallel conversion, transmission equalization, transmission protection, and convergence of low-speed optical signals. For example, dense wavelength division multiplexing equipment. In this way, the second service processing subsystem ²⁵¹²⁵ of the delivery device having a packet (or cell) to exchange information header transmitted encoded, electro-optic, fiber aggregation and other operations, to exchange messages transmitted through the first transmission device 201 Switching device 203 to central switching subsystem 20. The switching device 203 exchanges the messages to the corresponding output port without blocking based on the exchange header information.

The first control device 202, according to functions, may further include for controlling the switching device to perform An exchange information control module for message data exchange, a system state control module for collecting and controlling the working state of the entire system, a service resource control module for managing the planning and allocation of service resources in the system, and a network for managing and controlling the system A network resource management module for planning and allocating resources, and a network management module for managing and collecting network information. The downlink processing of the packet data is similar to the uplink. The packet is forwarded from the central switching subsystem 20 to the service processing subsystem 25, and is decapsulated and reassembled by the switching processing module 2521 in the user equipment 252, and sent to the traffic management module. In 2522, the queue is entered into the output queue and finally sent to the receiving end user.

According to the above description, the route switching system has high scalability of switching capacity, and the DWDM device can distribute the service processing subsystem of the system to the metropolitan area and the wide area, which brings huge networking flexibility. Sexuality greatly simplifies the complexity of the network structure, improves the delay of data forwarding and the certainty of delay jitter, and simplifies the complex network-wide QoS problem to the device QoS problem, improving end-to-end QoS performance.

The routing switching system according to another embodiment of the present invention is as shown in FIG. 3, and the same elements as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In the embodiment shown in FIG. 3, the traffic management module 2522 and the exchange processing module 2521 in the user equipment 252 of the service processing subsystem 25 are disposed in the central switching subsystem 20, at which time the user equipment 252 in the service processing subsystem 25 Only the message processing module 2523 is included, so that the function of the user device 252 is only ^^艮 access control and processing. In this embodiment, the traffic processing module 2522 and the exchange processing module 2521 in the central switching subsystem 20 and the user equipment 252 of the service processing subsystem 25 are not necessarily in a corresponding relationship, and there may be multiple service processing subsystems 25 The case of sharing the same module. In the present embodiment, the functions of the respective constituent elements are unchanged.

4 is a schematic diagram of a route switching system according to still another embodiment of the present invention, wherein the same components as those of FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 4, the exchange processing module 2521 in the user equipment 252 of the service processing subsystem 25 is located in the central switching subsystem 20, and the user equipment 252 retains the traffic management module 2522 and the message processing module 2523. At this time, the service processing subsystem 25 has no function of exchanging processing, and still has related functions such as message processing and traffic management. Similarly, the exchange processing module 2521 of the central switching subsystem 20 and the user equipment 251 of the service processing subsystem 25 do not necessarily have a one-to-one correspondence. There may be cases where a plurality of service processing subsystems ²⁵ share an exchange processing module 2521. It can be seen from the above description that although the composition forms of the two embodiments have changed, the single processing flow and the unified resource management have not changed, and the process to be exchanged is relatively simple because the exchange processing is not separated. The exchange capacity upgrade capability is stronger.

For the routing switching system of the above three embodiments, if the redundant backup of the central switching subsystem of the multi-region is to be implemented, the traffic of the control information on the physical link between the central switching subsystems is increased.

Figure 5 is a schematic diagram of the construction of a metropolitan area network or a wide area network using the routing switching system of the present invention. The entire backbone network 50 is similar to the basic architecture of the routing switching system of the present invention. The present invention separates the service processing subsystem 25 from the central switching subsystem 20, which may be a remote subsystem device or a near-terminal system. Multiple central switching subsystems 20 can be included with the ability to share traffic and redundancy. The service processing subsystem 25 completes the detachment and analysis, table lookup, traffic management and forwarding of the network, and the central switching subsystem 20 completes the non-blocking exchange of packet data, thus forming a single global routing and switching network. In addition, the central switching subsystem 20 can also satisfy the smooth upgrade, and the routing switching system is centralized control.

Figure 6 shows the use of the routing switching system of the present invention as a subordinate! ^ Schematic diagram of the device building a higher-level WAN. As shown in FIG. 6, in the upper-level wide area network, the central switching subsystem 20 is connected to the core network switching device 41. Due to the simplification of the lower-level network equipment and the clear network structure, the wide-area network can still achieve the effects of simple control and unified management. In addition, the hierarchical control system also simplifies the inter-domain control protocol, improving the utilization efficiency of the packet data network. For example, if the automatic switched optical network (AS0N) is used as the core network switching device 41, the resource management of the system does not need to span a large number of routing devices, and the unified management of resources can still be realized. In addition, the network hierarchy structure, the circuit switching domain routing strategy is simplified, greatly improving the cross-domain end-to-end data transmission control capabilities. Industrial applicability

The invention can be applied to the field of data communication 4 wireless communication, and can form a wide area packet data exchange network and a metropolitan area network.

Claims

Claim

1. A routing switching system, comprising:

At least one service processing subsystem, configured to process the accessed message data and forward the message; at least one central switching subsystem, configured to implement the data exchange between the service processing subsystems, and manage the entire system Resource

The central switching subsystem includes:

a first transmitting device, configured to send and receive message data and control interaction information with the service processing subsystem;

a second transmitting device, configured to send and receive message data and control interaction information with the first transmitting device, to implement packet processing and exchange processing of the user;

And a management device, configured to process a local protocol, and manage resources of the user equipment application; a second control device, configured to perform network management, and configure and supervise the user equipment and the second transmission device.

The route switching system according to claim 1, wherein the plurality of switching devices constitute redundancy in the form of 1:1, 1+1, n: l or n+1.

The routing control system according to claim 1, wherein the first control device further comprises:

An exchange information control module, configured to control exchange of message data of the switching device; a system state control module, configured to collect and control an operating state of the entire system; and a network resource management module, configured to manage and control network resources in the system Planning and distribution.

The routing and switching system according to claim 3, wherein the first control device further comprises: a service resource control module, configured to manage planning and allocation of service resources in the system.

The routing and switching system according to claim 3, wherein the first control device further comprises: a network management module, configured to manage and collect network information.

The route switching system according to claim 1, wherein the first transmitting device is an optical connecting device or an electrical connecting device.

The route switching system according to claim 6, wherein the optical connection device is a fiber convergence transmission device or a dense wavelength division multiplexing transmission device.

8. The routing switching system according to claim 1, wherein the plurality of central switching subsystems constitute a redundancy system of 1: 1, 1+1, n: l or n+1.

9. The routing and switching system of claim 1, wherein the user equipment further comprises:

The switching processing module is configured to perform exchange control on the packet sent by the packet processing module, and forward the packet sent by the second transmitting device to the packet processing module, and simultaneously process the switching signaling.

The routing and switching system according to claim 9, wherein the user equipment further comprises: a traffic management module, configured to perform queue management on the packet sent by the packet processing module and the exchange processing module And scheduling.

The routing switching system according to claim 1, wherein the central switching subsystem further comprises:

At least one switching processing module, configured to exchange and control packet data sent by the first transmitting device, and send the exchanged packet data to the first transmitting device, and process the switching signaling;

The user equipment of the service processing subsystem includes:

a message processing module, configured to perform access control and processing on packet data received by the external access system, and forward the packet data to the second transmitting device, and send the packet data received from the second transmitting device Go to the external access system.

The routing and switching system according to claim 11, wherein the user equipment further comprises: a traffic management module, configured to queue the packets sent by the packet processing module and the second transmitting device Management and scheduling.

The routing switching system according to claim 11, wherein the central switching subsystem further comprises: at least one traffic management module, configured to send the report to the first transmitting device and the switching processing module The text is queued and scheduled.

The routing and switching system according to any one of claims 1 to 13, further comprising: at least one interface subsystem, connected to the service processing subsystem, for accessing message data.

15. The routing switching system of claim 14, wherein the interface subsystem is a collection of a plurality of network interface devices.