CN1482769A - Main/standby switching and load sharing system and method based on Ethernet access platform - Google Patents

Abstract

The invention relates to a main/standby switching and load sharing system and method based on an Ethernet access platform. The full configuration system comprises: a plurality of service modules for accessing user data, each service module is provided with two uplink ports which are respectively connected with a main control board and a standby main control board, and the port binding technology is adopted to realize load sharing; two main control boards composed of control module and exchange module, the control module runs the whole platform device, the exchange module realizes the local exchange of the access user, each exchange module is provided with two uplink ports, each connected with an uplink module, used for main and standby switching and exchange load sharing; two uplink modules, each of which is provided with an uplink port, are used for uplink port backup and load sharing. The invention makes full use of the technical advantages of the Ethernet, is beneficial to improving the reliability of the Ethernet access platform and is flexibly configured.

Description

Active/standby switchover and load sharing system and method based on Ethernet access platform

technical field

The invention relates to a network technology, more specifically to a master-standby switching and load sharing technology based on an Ethernet access platform.

Background technique

With the rapid development of computer technology, computer network technology has also been widely used. From the completion of general data processing to more and more information exchanges, more and more enterprises or families are obtaining information and information through the Internet. . Various network technologies play a role in different applications. Continuously improving network bandwidth and enriching services to meet various needs of users has become the trend of network development. The Ethernet technology meets the various needs of users with its unique advantages and continuous innovation, so the application of Ethernet is becoming more and more extensive.

With the continuous development of information technology and computer technology, in order to meet the needs of the majority of users, telecommunications operations are also constantly building new backbone networks. The main backbone networks that exist at present include ATM (Asynchronous Transfer Mode) backbone network and IP backbone network. Among them, the IP backbone network based on IP technology is favored by the majority of telecom operators due to its low cost and high bandwidth. Therefore, the corresponding IP backbone network equipment also provides more and more gigabit or higher The high-speed Ethernet port and the access network equipment connected to the IP backbone network equipment also provide the same gigabit or higher-speed Ethernet interface.

With the emergence of Fast Ethernet and Gigabit Ethernet, the position of Ethernet technology in telecommunication equipment is becoming more and more important. Applying Ethernet technology to telecommunication equipment needs to solve the problem of bandwidth and security. , user management issues and service priority and other technical issues, these technical issues have made great progress. The current Gigabit Ethernet technology or 10G Ethernet technology can well solve the bandwidth problem of Ethernet, including: VLAN (Virtual Local Area Network) technology based on IEEE802.1q protocol can realize user isolation and can solve the problem of Ethernet application Security issues; the QOS (Quality of Service) technology based on the IEEE802.1p protocol can realize the priority classification of user data, and can solve the service priority problem of Ethernet applications; the emerging user management technology based on the IEEE802.1x protocol can solve Port-based user authentication and management; in addition, there are technologies such as flow classification technology, stacking technology, port bundling, etc., which make the application of Ethernet technology in telecommunication equipment more and more perfect.

At present, from the perspective of Ethernet switching technology, Ethernet devices are basically implemented using modular structure and high-speed ASIC technology, which can complete wire-speed physical (MAC) layer switching, support Simple Network Management Protocol (SNMP) and remote Network Management Protocol (RMON), with rich management functions. Ethernet equipment can automatically establish and maintain various address tables, and establish switching paths between input and output ports according to the content of the address table, that is, according to the destination MAC address or other field information in each data packet, the internal address table Find the corresponding destination port number, and forward the data packet with a very small delay. Virtual local area network (VLAN) technology can divide the Ethernet originally in a broadcast domain into multiple logical network segments, and communicate with each other through the three-layer routing technology, which can not only improve the performance of the network, but also improve the security of the network. The three-layer switching technology can establish a routing table according to the original address and destination address of the first three layers, and implement hardware forwarding for the subsequent data packets of the same route, which not only reduces the networking cost, but also improves the network performance. Ethernet devices can also provide many functions required by modern networks, such as: information flow priority (IEEE802.1p), service classification (COS), virtual local area network (VLAN), remote monitoring (RMON), automatic flow control (IEEE802. 3x), multicast, policy-based control, embedded network management agent, etc.

The emergence of Gigabit Ethernet technology has greatly increased the network rate. The corresponding standard is IEEE802.3z, which can run on optical fiber or cable media. Stacking technology is to interconnect two or more switching units through high-speed uplink ports to form a larger switching unit, which can well expand the capacity of the network. Port bundling technology is to allow two or more ports to transmit data in a load-sharing manner. From the outside, it looks like a port is completed. If a port fails, the business will automatically be realized through other ports. This technology not only The bandwidth of the interface of the Ethernet device can be increased, and the reliability of the device can also be increased.

Access technology is a technology that connects low-speed user data at the edge of the network with a high-speed backbone network. The architecture of the access network in the traditional telephone network solves the problem of accessing narrowband services such as telephone data. However, with the development of broadband networks, the demand for broadband access is increasing. Ethernet access technology is a broadband access technology that currently exists.

Traditional Ethernet technology is generally only used in LAN systems, but with the development of Ethernet technology, it has gradually been able to solve problems such as user billing and user management, so Ethernet technology is also more and more widely used in access systems. The characteristic of Ethernet access is to provide users with Ethernet ports. The uplink interfaces of most enterprise networks are also Ethernet ports. Therefore, Ethernet access technology will gradually become popular in broadband access with its higher bandwidth and lower cost. Play its part.

One of the technical problems to be solved by broadband access equipment is how to process the data accessed from the user end. Currently, commonly used solutions include access platform solutions based on ATM technology and access platform solutions based on Ethernet technology.

The access platform based on ATM technology shown in Fig. 1, user data 11 (can be xDSL data or Ethernet data etc.) input service module 12, the platform backplane data (adopting cell format, having QOS, flow control, etc.) 13, under the control of the access platform control module 142, processed by the uplink module/switch module 141 into platform device uplink data (can be ATM cell, Ethernet frame format, etc.) 15, connected The inbound platform control module 142 and the uplink module/switching module 141 constitute the main control switching unit 14, and they can be on the same single board or different single boards.

The access platform equipment based on ATM technology uses cell technology to process the access data, which can give full play to the advantages of ATM technology and its technical advantages such as QOS and flow control. In the access platform equipment based on ATM technology, the cells processed on the backplane are not necessarily standard 53-byte ATM cells, but can be other types of cells, which also have the characteristics of ATM cells. This kind of equipment has the characteristics of high reliability, and the key uplink modules, switch modules, and control modules have backups. However, with the large-scale construction of IP MAN, many ATM access devices are challenged by Ethernet access devices. ATM The technical implementation of the access device is very complicated and the cost is high, which greatly limits the promotion of this platform device.

In the access platform device based on Ethernet technology shown in Figure 2, user data 21 (can be xDSL data or Ethernet data, etc.) frame format, has the advantages of fast speed and low cost of implementation), under the control of the access platform control module 242, through the uplink module/exchange module 241, it is processed into platform device uplink port data 25 (using the Ethernet frame format), and access The platform control module and the uplink module/switching module constitute the main control switching unit 24, and they can be on the same single board or different single boards.

The feature of the access platform equipment based on Ethernet technology is that the data transmitted on the backplane is an Ethernet frame. The business interface is also an Ethernet interface. This platform can give full play to the advantages of high bandwidth, simple implementation, and low equipment cost of the Ethernet technology system.

Since the Ethernet uplink interface device is connected to many users, it is in a very critical position. If the control module or the uplink interface fails, it will undoubtedly cause great losses.

Previously, telecom narrowband equipment, which mainly used telephone services, had relatively high reliability. One of the most important reasons was to set up hot backup, cold backup, and load sharing for key modules such as switching and control of equipment. As users' demand for broadband access increases, it is becoming more and more important to improve the reliability of equipment. This can not only improve the reliability of telecom operators' networks, but also improve the reliability of key uplink equipment of enterprise networks.

However, in general, the current Ethernet technology does not have a particularly effective solution to meet the high reliability requirements of telecommunication equipment. Many equipment do not have a backup scheme for key control modules, nor do they have backup solutions for key business uplink modules. For the backup solution, centralized switching is adopted in business.

As shown in Figure 3, the access platform equipment based on Ethernet technology is connected to multiple service modules 34, and only one control module 31, switching module 32 and uplink module 33 are provided. Although there are solutions that are simple to implement and low in cost Advantages, but cannot meet the strict reliability requirements of carrier-grade equipment or enterprise key networks. When a key module of an access platform device based on Ethernet technology fails, it may lead to a network paralysis in a region, which will have a great impact on telecom operators, enterprises, and even general users. The switching module 32 shown in the figure is backed up with an uplink port, but since one port is in a working state and the other port is in a fully backed up idle state, bandwidth and resources are greatly wasted.

Although some access platform devices based on Ethernet technology have backup schemes for key modules, they are only cold backups. When a key module fails, network maintenance personnel need to start the backup module. There are also backups for the key modules of the Ethernet access equipment, but when the key modules of the equipment fail, they cannot be automatically restored, and the cold backup module can only be activated by the network maintenance personnel, which makes the maintenance process complicated. , and will disrupt the network.

Contents of the invention

The purpose of the present invention is to design a system and method for active-standby switchover and load sharing based on an Ethernet access platform. The present invention aims at the problems analyzed in the background technology part to realize the active-standby of the key control modules of the Ethernet access platform equipment. Switching, backup and load sharing of switching modules and uplink interface modules, so as to greatly improve the reliability of telecommunication access equipment.

The technical solution for realizing the purpose of the present invention is as follows: a system based on an Ethernet access platform for active/standby switchover and load sharing, comprising: an uplink module for providing an uplink interface; a control module and a switch module One main control board, the control module is used to control the operation of the entire Ethernet access platform equipment, the switching module is used to realize the local switching of the access users, the control module controls the switching module, and the uplink port of the switching module is connected to the uplink module; more than one The business module is used to access user data, and provides an uplink port to connect with the switching module, and is characterized in that it also includes:

Add a main control board composed of a control module and a switching module or/and add an uplink module to form a main main control board and a backup main control board, a main control module and a backup control module, a main switching module and a backup switching module , the main uplink module and the backup uplink module;

Each business module is provided with more than one uplink port, and more than one uplink port of each business module is correspondingly connected to the active main control board and the standby main control board;

The active and standby switching modules are connected through the uplink ports on the active and standby main control boards in a stacked manner, and respectively connected to the active and standby uplink modules.

Two uplink ports are respectively arranged on the main and standby switch modules;

The uplink ports of the main and backup switch modules and the uplink ports of the main and backup uplink modules are each provided with a one-two high-speed relay switch, which is controlled by the control circuit;

One uplink port of the main switch module is connected to a selected end of the one-of-two high-speed relay switch on the main uplink module, and the other uplink port of the main switch module is connected to one of the two-choice high-speed relay switch on the main switch module. Selecting end, a selected end of the one-of-two high-speed relay switch on the active switching module is connected to a selected end of the one-of-two high-speed relay switch on the standby uplink module;

One uplink port of the standby switch module is connected to the other selected end of the one-of-two high-speed relay switch on the standby uplink module, and the other uplink port of the standby switch module is connected to the selection end of the one-two high-speed relay switch on the standby switch module, One selected end of the one-of-two high-speed relay switch on the standby switching module is connected to the other selected end of the one-of-two high-speed relay switch on the active uplink module;

The other selected end of the one-of-two high-speed relay switch of the main and standby switching modules performs the stacking connection;

The selection end of the one-of-two high-speed relay switch on the main uplink module is connected to the uplink port of the main uplink module;

The selection end of the one-of-two high-speed relay switch on the standby uplink module is connected to the uplink port of the standby uplink module.

The active-standby switchover and load sharing method based on the Ethernet access platform of the present invention is characterized in that it includes:

When a standby main control board is set:

A. The uplink ports on the business modules connected to the main and standby main control boards respectively realize port bundling and load sharing;

B. Both the active and standby control modules are running. At the same time, only one active or standby control module is responsible for the control task of the system. When the active or standby control module fails, the faulty control module and the non-faulty control module Switch;

C. The switch load sharing work is performed by the active and standby switching modules. When the active or standby switching module fails, the switching of the active and standby switching modules is performed, and all switching services are completed by the non-faulty switching module;

When setting up a backup uplink module:

D. The main and standby uplink modules perform uplink port backup and load sharing.

The methods B and C further include a binding relationship between the active control module and the active switch module, and between the standby control module and the standby switch module during active-standby switching, and when the active and standby control modules are switched The switching of the active and standby switching modules occurs at the same time, or the switching of the active and standby control modules occurs simultaneously with the switching of the active and standby switching modules.

In the method of the present invention, the main control module controls and manages the standby switching module under the cooperation of the standby control module.

The active/standby switching and load sharing system and method based on the Ethernet access platform of the present invention mainly include the active/standby switching scheme of the main control board of the Ethernet switching access platform equipment, and the business switching load sharing of the Ethernet switching access platform equipment scheme, and the uplink module backup and load sharing scheme of the Ethernet switching access platform equipment, so that the key modules of the Ethernet access platform equipment can be backed up, and at the same time, load sharing can be realized on the business exchange. When the equipment is running normally, it can provide The active-standby switchover function ensures fast switching and automatic recovery in the event of a service failure, improving the reliability of the equipment; in addition, the active-standby module realizes load sharing, which can make full use of the idle bandwidth resources of the standby module, increase the system switching bandwidth, and realize Wire-speed access for user services.

In the system and method of the present invention, the control module is divided into two, which can realize active-standby switchover, and only one control module controls the entire device at the same time. If one control module fails, the other control module can immediately take charge of the system. control tasks, the system will not be paralyzed;

Divide the switching module into two to realize switching load sharing. If one switching module fails, the service will be completed by the remaining switching module, and the network will not be interrupted;

Divide the uplink module into two and combine it with the switching module to realize backup or load sharing. There are two specific situations: if both switching modules work normally, when the two switching modules implement service switching load sharing through stacking, each One switch module is assigned one uplink module, allowing the system to have two GE ports (Gigabit Ethernet interfaces), and backup or load sharing can be realized between the two GE ports; if any switch module fails, the two uplink modules can automatically Disconnect the connection with the faulty switching module, and connect it with the normal working switching module, the system can still have two GE ports, and backup or load sharing can be realized between the two GE ports, which will not bring bottleneck problems to the upstream bandwidth of the system;

Each business module is equipped with two FE uplink ports (100M Ethernet interfaces), which are connected to the two switching modules of the two main control boards. When the system works in the state of dual main control boards, the two ports are in the The bundling status conforms to the standard 802.3ad protocol; when the main control board of the device is faulty and an active/standby switchover occurs, the software modifies the binding forwarding table of the port connecting the switching module of the main control board and the service module to realize user data flow to different Switching of switching modules.

Description of drawings

Fig. 1 is the signal processing flow diagram of the access platform based on ATM technology;

FIG. 2 is a schematic diagram of a signal processing flow of an access platform based on Ethernet technology;

FIG. 3 is a schematic diagram of a common structural technical scheme of an access platform based on Ethernet technology;

Fig. 4 is the technical scheme schematic diagram of Ethernet access platform structure of the present invention;

Fig. 5 is the second technical solution mode of the present invention, a module connection diagram when an upstream port failure occurs;

Fig. 6 is a third technical solution mode of the present invention, a module connection diagram under default conditions;

Fig. 7 is the technical solution mode 3 of the present invention, the first module connection diagram under the active/standby switchover of the equipment;

Fig. 8 is the third mode of the technical solution of the present invention, the second module connection diagram under the active/standby switchover of the equipment;

Fig. 9 is a fourth technical solution mode of the present invention, a connection diagram of each module under default conditions;

Fig. 10 is the fourth technical solution mode of the present invention, the connection relationship diagram of each module after the standby main control board fails;

Fig. 11 is the fourth technical solution mode of the present invention, the connection relationship diagram of each module after the failure of the main main control board;

Fig. 12 is a fourth technical solution mode of the present invention, a connection diagram of each module after an uplink board fails.

Detailed ways

FIG. 1 to FIG. 3 have been described above and will not be described in detail.

Referring to Fig. 4, the Ethernet access platform device of the present invention includes a plurality of service modules 41, master control boards 42, 44 with active/standby identities, respectively including switch modules 421, 441 and control modules 422, 442, and master/standby The identity uplink modules 43 and 45 complete the main functions including: the service module 41 of the service board accesses user data; the switching modules 421 and 441 realize the local switching of the connected users, and the control modules 422 and 442 control the operation of the entire device; The uplink modules 43 and 45 of the uplink board provide various uplink interfaces.

Each business module 41 is provided with two uplink ports (FE port, 100M Fast Ethernet interface), is respectively connected with main main control board 42 and standby main control board 44 (assuming that the left side is the main main control board, and the right side is the standby main control board). main control board), the switching modules 421 and 441 on the main and standby main control boards 42 and 44 are respectively provided with two (or only one uplink port) uplink ports (GE port, Gigabit Ethernet interface) GE1, GE2, the main and standby main control boards 42, 44 are respectively equipped with a two-choice high-speed relay switch 423, 443, and the uplink ports of the main and standby uplink modules 43, 45 are each equipped with a two-choice high-speed relay Switches 431,451. An uplink port (GE2) of the active and standby switching modules 421, 441 is respectively connected to the selection terminals of the two-to-one high-speed relay switches 423, 443, and one selected terminal of the two two-to-one high-speed relay switches 423, 443 Carry out the stacking connection of the active and standby switch modules 421, 441, and the other selected end is respectively connected to one selected end of the standby and active uplink modules 45, 43 on the one-of-two high-speed relay switch 451, 431; And another uplink port (GE1) of the standby switch module 421,441 is correspondingly connected to another selected end of the two-choice high-speed relay switch on the main and standby uplink modules 43 and 45; the main and standby uplink modules 43 and 45 The selection terminals of the upper two-to-one high-speed relay switches 431 and 451 are respectively connected to the uplink modules 43 and 45 of the active and standby uplink boards.

To sum up, the system solution of the present invention can have the following six advantages.

The first advantage is: According to user needs, the Ethernet-based access platform system can support the combined use of single/double main control boards, single/double uplink boards, etc., resulting in four typical working modes:

Mode 1: 1 main control board, 1 uplink board, does not support active/standby switchover, does not support switching load sharing, does not support uplink port backup and load sharing, and the system provides 1 GE uplink port (default).

Mode 2: 1 main control board, 2 uplink boards, does not support active/standby switchover, does not support switching load sharing, supports uplink port backup and load sharing, and the system provides 2 GE uplink ports (default).

Mode 3: 2 main control boards, 1 uplink board, support master/standby switchover, switch load sharing, uplink port backup and load sharing, and the system provides 1 GE uplink port (default).

Mode 4: 2 main control boards, 2 uplink boards, support active/standby switchover, switch load sharing, uplink port backup and load sharing, and the system provides 2 GE uplink ports (full configuration).

The second advantage is: the two control modules can realize master-slave hot backup work, and only one control module controls the entire access device at the same time. If a master control module fails, the system automatically realizes the master-standby switchover , another spare control module can be upgraded to the active control module, and quickly take on the control task of the system.

The third advantage is: the system control module and the switching module can both be on the same main control board and work together. If any one of them fails, it will cause the master-standby switchover between the main control boards. At this time, there is only one main control board. The control board works without load sharing, and the switching bandwidth is reduced to half of the original. The binding relationship refers to that there is a binding relationship between the active control module and the active switching module, and between the standby control module and the standby switching module during switching. When one of them is switched, the other will follow suit. Switchover occurs. For example, the switchover between the active switch module and the standby switch module occurs at the same time as the active control module and the standby control module are switched. Control switching between modules.

The fourth advantage is: under full configuration, the system not only realizes business exchange backup and load sharing, but also provides uplink port backup and load sharing. The two are independent of each other and may not affect each other, but they can work together.

The fifth advantage is: the system switching capacity can be expanded as needed, from 17.6G to 176G, and there is no need to replace the backplane.

The sixth advantage is: after various faults occur, if the fault is eliminated, the system can re-establish the connection relationship under normal conditions through software and hardware detection and configuration, and return to the normal working state.

In order to meet the requirements of the design, the key modules can realize load sharing and active/standby switching. The business modules must have at least two uplink ports. The switch module can have two uplink ports or only one uplink port. The switch module must also support stacking applications ( There are many kinds of this Lan Switch chip on the market at present, and many single-chip ASICs can realize 24FE+2GE switching, and some have more than three layers of functions. Through the uplink interface provided by the Lan Switch chip itself, two switching Modules are stacked to expand the switching capacity).

The control module can be implemented together with the switching module, implemented with a single board, or implemented separately. The separation of the control module and the switch module can better complete the active-standby switchover function on the control; however, considering the cost factor of the access product and the number of backplane interface signals, the control module and the switch On-board implementation is better. Moreover, the active control module needs the standby control module to work together to control the standby switch module, and the active control module cannot independently manage the standby switch module.

The uplink module generally has a GE interface. At present, most of the GE interfaces provided by the Lan Switch (local area network switching) chip are GMII/TBI interfaces. In order to make the uplink interface signal of the switch module simple and reduce the number of signals between modules, a A SERDES (serialization and deserialization) conversion chip converts the TBI/GMII interface into a 1.25Gbps GE Ethernet differential signal interface, allowing the differential signal to be transmitted on the backplane, and the service module can also be connected to the FE port of the switch module Similar processing, but the rate is lower, only 100Mbps.

The actual typical application of the present invention is analyzed and explained item by item below.

Working mode 1: 1 main control board, 1 uplink board, does not support active/standby switchover, does not support switching load sharing, does not support uplink port backup and load sharing, and the system has 1 GE port. This mode does not have any backup and load sharing, because only one main control board and one uplink board are used, the cost is low, and it is suitable for application environments with low system reliability requirements and low bandwidth requirements, and the switching and uplink bandwidths are only full. half of the configuration.

Working mode 2: see Figure 5, 1 main control board 42, 2 uplink boards 43, 45, does not support active/standby switching, does not support switching load sharing, supports uplink port backup and load sharing, and the system has 2 GE ports. This mode does not have exchange backup and load sharing, but because both uplink modules are working, uplink port backup and load sharing can be realized. If one uplink module fails, as shown in the right uplink module 45 in the figure, the service (service module 41) It is only forwarded through another uplink module 43, and the network will not be interrupted. It is suitable for application environments with simple requirements on reliability and large uplink bandwidth, and the switching bandwidth is only half of the full configuration.

Working mode 3: see Figure 6, 2 main control boards 42, 44, 1 uplink board 43, support active/standby switchover, support switch load sharing, do not support uplink port backup and load sharing, the system has 1 GE port. When all modules work normally, only one control module controls the equipment at the same time. This mode is suitable for application environments with high reliability requirements and low upstream bandwidth requirements. If the main main control board 42 fails during device operation, the device will automatically switch over the active and standby devices, and the network will not be interrupted, and the upstream bandwidth will only be fully configured. half of.

In the case of system working mode 3, because the master and backup master control boards 42 and 44 are both in place, for the convenience of networking, the system defaults the master control board 42 in slot 0 as the active master board (the left side of the figure), and the main control board 44 in slot 1 is the standby main control board (the right side of the figure), which is the default configuration of the device.

In the system default configuration mode, only the slot of the active main control board 42 has the uplink module 43 , and the standby main control board 44 is stacked with the switching modules 441 and 421 of the active main control board 42 . When the active main control board 42 fails, the system will undergo an active/standby switchover. At this time, the active main control board 42 disconnects from the service module 41, disconnects the stack connection from the standby main control board 44, and switches the module 441. Open the connection with the uplink module 43, and at the same time, the switch module 441 of the standby main control board 44 connects its spare stack port to the uplink module 43, and the system connection relationship becomes as shown in Figure 7 (the disconnected relationship is indicated by a crossed line segment) .

If due to some special circumstances, the uplink module is initially configured in the No. 1 spare slot, when the main main control board fails, the system will have a master-standby switchover, and the network will not be interrupted. At this time, the uplink port switchover is relatively simple. , the active main control board only needs to close the stack connection with the standby main control board, and the system connection relationship becomes as shown in Figure 8.

In short, in the third working mode of the system, the position of an uplink module 43 can be flexibly configured on slots No. into any slot on the main control board. It should be pointed out that slot 0 is considered to be the master main control board by default when the system is started. No matter how the uplink board is configured, as long as the system has an active/standby switchover, the service module 41 will pass through the standby master board in slot 1. The control board 44 completes the switching and control functions, and actually changes to working mode 1 without interruption of the network.

Working mode 4: see Figure 9, 2 main control boards 42, 44, 2 uplink boards 43, 45, support active/standby switching, switch load sharing, uplink port backup and load sharing, and the system has 2 GE ports. This mode is suitable for application environments with high reliability requirements and large uplink bandwidth requirements, and is fully configured as a system standard.

Under normal circumstances, the two switching modules 421, 441 can be stacked to increase the network switching capacity; each service module 41 is connected to the two switching modules 421, 441, so that the business traffic can be load-shared to the two switching modules ; Both control modules are running. When all modules are working normally, only one control module controls the equipment at any time, and the other control module is in hot backup.

In working mode 4, there are two possible failures of the main control board and the upstream board. The detailed analysis is as follows:

(1) As shown in Figure 10, if the standby main control board 44 in slot No. The master main control board 42 in the No. slot connects its free stack port to the GE port of another uplink board 45, and at this time, the relationship between the modules is actually converted into the connection relationship of mode 2;

(2) As shown in Figure 11, the active main control board 42 in slot 0 fails, and an active/standby switchover will occur at this time, and the active main control board 42 will be disconnected from the service module 41 and the standby main control board 44 1. The connection with the uplink module 43, the standby main control board 44 in the No. 1 slot connects its free stacking port with the GE port of another uplink module 43, and the connection relationship between the modules is actually converted into the mode 2 at this time Connection relationship (master-standby switchover occurs first, and then GE switchover of the uplink port is realized);

(3) As shown in Figure 12, an uplink module breaks down (such as 43), and the uplink module 43 is disconnected from the main control board 92. At this time, the system working mode four is actually converted into mode three, and the uplink bandwidth It is reduced by half, and other changes remain unchanged. At this time, all modules work normally, and only one control module controls the equipment at the same time.

To sum up, no matter what mode the system works in, as long as one of the active and standby main control boards and one of the active and standby uplink boards works normally in the system, the network can be guaranteed through active-standby switchover and connection switching between modules. will not be interrupted.

The design of the present invention fully considers the relationship between user networking requirements and performance costs. The system configuration is very flexible, the maintenance is simple, and it can achieve high reliability and meet the requirements of telecom-level equipment. load sharing scheme.

As mentioned above, this system is composed of the main control board (including the control module and the switching module), the uplink board and the service module. The connection between the switching module and the switching module, and between the switching module and the uplink module is recommended to be through Ethernet differential The advantage of signal connection is that the number of module interface signals is small, the interface is simple, and it is easy to expand. When implementing the design scheme, the switching module and the service module are connected through the 100M Ethernet port (FE), and the interface is a 100MHz differential signal of LVPECL level. The switch module and the uplink module are connected through a Gigabit Ethernet port (GE), and the interface is a 1.25GHz differential signal of LVPECL level.

The technology to realize active-standby switchover and load sharing based on Ethernet access platform mainly includes the following two parts:

1) Logical switching of the GE link between the main control board and the uplink board. As shown in Figure 4:

In Fig. 4, there is a 2-to-1 high-speed relay switch 423, 443, 431 and 451 on the Gigabit port (GE) of the main control board 42, 44 and the uplink board 43, 45, and each relay switch is controlled by The output signal control (not shown in the figure) of a control circuit is combined to complete the logic switching function shown in Table 1:

Table 1 Board type Control circuit input Control circuit output Relay switch input logical connection upstream board a square wave of a certain frequency low level low level Link between the upstream board and the main control board in the slot fixed level high level high level Link between the upstream board and the main control board in the adjacent slot main control board a square wave of a certain frequency low level low level Link between the main control board and the main control board in the adjacent slot fixed level high level high level Link between the main control board and the upstream board in the adjacent slot

Based on the above design, as long as the main control board is in place and works normally, the control module will send a square wave signal of a certain frequency to the control circuit of the uplink board in this slot, so that the output of the control circuit is low, so that the GE1 physical link occupies this slot At the same time, the control module will also send a square wave signal of the same frequency to the adjacent main control board to realize the connection between the two main control boards on the GE2 physical link, as shown in Figure 9.

If the system fails and a main control board works abnormally, the control module will send a fixed level to the control circuit of the upstream board in this slot, so that the output of the control circuit is high. At this time, the upstream board in this slot and the adjacent The main control board GE1 of the main control board starts to connect, and disconnects the connection with the faulty main control The board is also disconnected from the main control board on the GE2 physical link, achieving the purpose of fault isolation, as shown in Figure 10 and Figure 11.

In actual application, according to different configuration networking and failure conditions, the control module combines the logic switching hardware design between the main control board and the upstream board, and the system can be flexibly implemented in the aforementioned two to four three working modes through the gating of the switch switching action.

2) The switching design of the FE link between the main control board and the service module:

There are FE ports connected between the service module and the active and standby main control boards in the access platform equipment. When the system works in the dual main control board state, the switching modules of the two main control boards are actually working in GE port stacking. In this mode, from the perspective of the service module, the two FE ports upstream to the main control board are in the state of port binding and load sharing, which conforms to the standard IEEE 802.3ad protocol definition.

Both port bundling and load sharing of switching modules can be implemented by hardware ASIC chips. The implementation principles are as follows:

1. Define that the two uplink FE ports from the service module to the main control board belong to a certain binding group (TGID). Note that the properties of the two ports must be identical at this time, such as speed, working mode, VLAN group they belong to, and so on.

2. When the hardware chip of the service module actually forwards the traffic out of the port, it will check the address resolution logic (ARL) address table according to the destination media access control layer (MAC) address of the user Ethernet message to determine whether to use the bundled group (TGID) up.

3. If the message is to be forwarded from the TGID, the hardware chip extracts 3 bits from the source MAC address and the destination MAC address of the message (assuming that a binding group supports up to 8 Ports), the index value pointing to the binding forwarding table (TTR) is obtained through the bit XOR operation, so as to select which uplink port to forward the message from the binding forwarding table (TTR).

4. In order to balance the forwarding traffic on the two upstream ports (assumed to be ports 25 and 26), you can know that the port numbers in the binding forwarding table (TTR) of the corresponding TGID should also be divided into half, as shown in Table 2 The TTR table before failure is shown:

Table 2 index The port number 0 25 1 26 2 25 3 26 4 25 5 26 6 25 7 26

Through the binding operation of the above two ports, the two physically separated ports actually function as one port logically, the port forwarding bandwidth is doubled, and at the same time, the user's uplink traffic is shared statistically, and the uplink traffic is evenly shared to the two ports.

Similarly, when the network-side traffic from the upstream board passes through the switch module of the main control board to the service module, although the two ports connected to the main control board and the service module are on different boards, they are still stacked across hardware chips. The bundling state can also improve the forwarding bandwidth and share the downlink traffic.

When the device is faulty and the active/standby switchover occurs, in order to stop the user traffic of the service module from going up to the faulty main control board as soon as possible and switch to the normal main control board, the control module of the normal working main control board will actively modify itself and In the bundled forwarding table TTR of the service module, change all the port numbers in it to the port number (assumed to be port 25) connecting the service module and the normal main control board, so as to realize the switching of uplink and downlink traffic to different switching modules, as shown in Table 3 The TTR table after the failure is shown:

table 3 index The port number 0 25 1 25 2 25 3 25 4 25 5 25 6 25 7 25

After the fault is repaired, the control module of the normal working main control board will also actively modify the binding forwarding table (TTR) of itself and the service module to the configuration in Table 1, thereby restoring the port binding and traffic sharing functions.

To sum up, the above two switching actions are controlled by the control module software. In actual implementation, the CPU of the control module controls the switchover of the GE port between the switch module and the uplink board through its extended IO interface and a special logic circuit; The PCI bus is used to control the TTR forwarding table of the switch module and the service module, so the system switching speed is fast, stable and efficient, and the network will not be interrupted during work, which increases the reliability of the equipment.

The technical scheme of the present invention is proved to be able to realize the object of the present invention through probation in the Ethernet access platform product of the switching access network.

Claims (12)

1. masterslave switchover and load sharing system based on an Ethernet access platform, comprising: a uplink module is used to provide upstream Interface; By a control module and the master control borad that Switching Module is formed, control module is used for whole Ethernet access platform equipment is moved control, Switching Module is used to realize inserting this locality exchange of user, control module control Switching Module, the up going port of Switching Module connects uplink module; More than one business module is used for access user data, and provides up going port to be connected with described Switching Module, it is characterized in that also comprising:

Set up a master control borad of forming by control module and Switching Module or/and set up a uplink module, form main control board and slave control board, main with control module and standby control module, main, main with uplink module and standby uplink module with Switching Module and standby Switching Module;

Each business module is provided with more than one up going port, corresponding main control board and the slave control board of connecting of the more than one up going port of each business module;

Primary and backup Switching Module connects by the stack that the up going port on it carries out between primary, spare master control borad, and is connected primary and backup uplink module respectively.

2. a kind of masterslave switchover and load sharing system based on the Ethernet access platform according to claim 1 is characterized in that:

Two up going ports respectively are set on described primary and backup Switching Module;

An alternative high speed relay switch respectively is being set, the control of controlled circuit on the up going port of primary, spare Switching Module and on the up going port of primary, spare uplink module;

A main up going port with Switching Module connects a main selected end with alternative high speed relay switch on the uplink module, main another up going port with Switching Module connects main selecting side with alternative high speed relay switch on the Switching Module, a main selected end that connects alternative high speed relay switch on the standby uplink module with a selected end of alternative high speed relay switch on the Switching Module;

A up going port of standby Switching Module connects another selected end of alternative high speed relay switch on the standby uplink module, another up going port of standby Switching Module connects the selecting side of alternative high speed relay switch on the standby Switching Module, and one of alternative high speed relay switch selected end connects main another selected end with alternative high speed relay switch on the uplink module on the standby Switching Module;

Another selected end of the alternative high speed relay switch of primary, spare Switching Module carries out described stack and connects;

Main selecting side with alternative high speed relay switch on the uplink module connects main up going port with uplink module;

The selecting side of alternative high speed relay switch connects the up going port of standby uplink module on the standby uplink module.

3. a kind of masterslave switchover and load sharing system based on the Ethernet access platform according to claim 1 and 2 is characterized in that: described master is arranged on the same veneer or divides with control module with Switching Module and master and is located on two veneers; Described standby Switching Module and standby control module are arranged on the same veneer or divide and be located on two veneers.

4. a kind of masterslave switchover and load sharing system according to claim 1 and 2 based on the Ethernet access platform, it is characterized in that: the up going port of described business module is the 100 m ethernet interface, the up going port of described Switching Module is a gigabit ethernet interface, and the Ethernet differential signal that interface is the LVPECL level connects.

One kind as claimed in claim 1 based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that comprising following method:

When being provided with slave control board:

A. the up going port that links to each other with primary, spare master control borad respectively on the business module is realized Port BindingBundling, carries out load sharing;

B. primary and backup control module is all moved, synchronization have only one main with or standby control module undertake the control task of system, main with or standby control module when breaking down, switching between FCM fault control module and fault-free control module arranged;

C. exchange load sharing ground work by primary and backup Switching Module, main with or standby Switching Module when breaking down, carry out active and standby Switching Module and switch, finish whole reciprocal exchanges of business by trouble-free Switching Module;

When being provided with standby uplink module:

D. by primary and backup uplink module, carry out up going port backup and load sharing.

6. according to claim 5 a kind of based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that: described steps A, when described system was in the double crossing over module status, two up going ports of business module were in the bundle status of striding stacked chips for two chips of active and standby Switching Module; Main with or slave control board when breaking down, the binding of main control module modification of fault-free master control borad self and business module connectivity port is transmitted, port numbers is revised as the port numbers that business module links to each other with the fault-free master control borad, the up-downgoing flow is switched on the fault-free Switching Module.

7. according to claim 5 a kind of based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that the Port BindingBundling and the load sharing of described steps A, further comprise:

A1. define business module and belong to a binding group (TGID) to two up going ports of master control borad;

A2. when business module converting flow outbound port, look into address resolution logic (ARL) address table, determine whether from this binding group (TGID) up according to purpose Media Access Controlled layer (MAC) address of user's message;

A3. for will be from the up message of this binding group (TGID), from message source Media Access Controlled layer (MAC) address and purpose Media Access Controlled layer (MAC) address, extract the bit that to represent a binding group (TGID) port number of supporting, and this bit is made XOR operate, obtain pointing to the index value that (TTR) transmitted in this binding group (TGID) binding;

A4. according to this index value, transmit the port numbers of choosing the up going port that E-Packets (TTR), user's upstream data flow equilibrium is shared to two mouths from binding;

A5. when Switching Module transmission network effluent amount is advanced the business module port, be in and stride hardware chip and pile up Switching Module and business module under the bundle status, downlink traffic is shared in equilibrium.

8. according to claim 7 a kind of based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that: in the described steps A 1, two up going ports that belong to a binding group (TGID) have identical attribute, comprise identical operating rate, identical working method and belong to same VLAN group (VLAN).

9. according to claim 5 a kind of based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that: described method B and C, further be included in main with control module and main with between the Switching Module, binding relationship when having masterslave switchover between standby control module and the standby Switching Module, switching of primary, spare Switching Module taken place when primary, spare control module is switched, and switching of primary, spare control module perhaps taken place when primary, spare Switching Module is switched.

10. according to claim 5 a kind of based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that described step C further comprises:

C1. on each two up going port of primary and backup master control borad and primary and backup uplink interface board, alternative high speed relay switch is set respectively, the output control of the controlled circuit of alternative high speed relay switch;

C2. when two master control borad fault-free work on the throne, control circuit is under the control of two master control borad control modules, output keeps first level state, each alternative high speed relay switch state makes a up going port of two master control borads take the uplink interface board of self groove position, another up going port takies the master control borad of adjacent slot position, realizes the connection of piling up between two master control borads;

C3. when a master control borad fault takes place, control circuit is under the control of two master control borad control modules, output keeps second level state, each alternative high speed relay switch state makes the uplink module of this groove position on the fault master control borad be communicated with a up going port of fault-free master control borad, disconnect with this groove position on being communicated with of fault master control borad arranged; Another up going port of fault-free master control borad still is communicated with the uplink module of this groove position, and another up going port disconnection of fault master control borad and being communicated with of fault-free master control borad are arranged, and carries out Fault Isolation.

11. according to claim 5 a kind of based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that described step D further comprises:

D1. when the work on the throne of two uplink module fault-free, the Switching Module of two master control borads is communicated with combination with the uplink module of this groove position respectively;

D2. when a uplink module fault takes place, have the fault uplink module disconnect with this groove position on being communicated with of master control borad Switching Module.

12. according to claim 5 a kind of based on the masterslave switchover of Ethernet access platform and the masterslave switchover and the load share method of load sharing system, it is characterized in that also comprising: be under the collaborative work of standby control module, to control, manage standby Switching Module with control module by described master.

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