WO2012019464A1

WO2012019464A1 - Inter-plate interconnection device and method in router cluster

Info

Publication number: WO2012019464A1
Application number: PCT/CN2011/072869
Authority: WO
Inventors: 叶傲; 陈健; 周海山; 杨骐; 杜相文; 马苗苗
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-08-09
Filing date: 2011-04-15
Publication date: 2012-02-16
Also published as: CN101917337A; CN101917337B

Abstract

The present invention discloses an inter-plate interconnection device in a router cluster, wherein the device includes: at least two central switching frames and a line card frame, wherein the central Ethernet switching plates of the at least two central switching frames are connected with each other and the Ethernet switching plates of the line card frame are connected with the central Ethernet switching plates of the at least two central switching frames respectively. The present invention also discloses an inter-plate interconnection method in a router cluster, wherein the method includes: connecting the central Ethernet switching plates of the at least two central switching frames with each other; connecting the Ethernet switching plates of the line card frame with the central Ethernet switching plates of the at least two central switching frames respectively. With the device and method of the present invention, the reliability is increased and the problem of the communication link interrupt between the line card frame and the central switching frames is solved.

Description

Device and method for interconnecting boards in router cluster

The present invention relates to a technique for controlling surface interconnection, and in particular, to an apparatus and method for inter-board interconnection in a router cluster. Background technique

With the rapid development of Internet technology, new services are emerging, especially the rise of video services represented by peer-to-peer (P2P) and Internet TV (IPTV), which greatly stimulates the demand for bandwidth, the Internet from the initial chat, email Demand for web browsing, etc., to today's P2P downloads, video chats, podcasts, etc. Both the application model and the network traffic have undergone earth-shaking changes. Therefore, the core equipment of the network faces increasingly severe challenges, especially the capacity and scalability of the core router of the backbone network. For example, in the process of telecommunications of IP networks, high-end core routers have high requirements in terms of capacity, security and reliability, and multi-service bearer capabilities. The core routers of backbone networks must have good scalability and upgrade capabilities to adapt to the Internet. Changeable and rapid development trend.

Router cluster technology is the most effective way to solve the bottleneck of router capacity. It is a great leap and change in the history of router development. It breaks the traditional router expansion mode, while retaining the clarity of the network structure, facilitating operation management and facilitating maintenance. Without increasing maintenance costs. Router clusters, also known as router matrices or multi-chassis interconnects, are: By using parallel switching technology, two or more common core routers are connected in some way to form a multi-level multi-plane switching matrix system. It can work together and behave only as a logical router, thus breaking through the limitations of single chassis in terms of switching capacity, power consumption, heat dissipation, etc., and smoothly expanding to a larger capacity routing switching system. The high-performance core router represents the development direction of the Internet, and it also best reflects the technical level of equipment manufacturers. Review the development history of core routers, Analysis of the current mainstream routing products features, we can see that the current core router technology development trends have the following aspects:

1. The capacity is getting higher and higher, and the port type is increased: The main performance is the increase of the slot number and the high density of the line card. First, the port capacity is increased from 2.5G to 10G, and then from 10G to 40G. In addition, the type of interface is gradually increasing.

2. Improve security and reliability: In the early stage of network development, because of the small traffic and the lack of network attacks, the security of router devices is mainly reflected in its own security and reliability, such as the electrical characteristics of network devices. With the continuous development of the network and the increasing demand for multiple services, the system is getting larger and larger. A small module failure affects the entire system. Network security guarantees higher requirements for the security and reliability of the router, including attacks on the network. Prevention and perception.

3, the system architecture is gradually improved: from the first generation single bus single CPU to the second generation single bus master and slave CPU, after the third generation single bus symmetric multi-CPU and fourth-generation multi-bus multi-CPU, to the present The fifth generation shared memory and sixth generation crossbar system. In terms of switching fabrics, high-end routers mainly use shared memory structures, and T-bit large-capacity routers mostly use multi-level switching fabrics to achieve future expansion to large-capacity non-blocking switching.

4. Improve Quality of Service (QoS): Carrier-class IP networks must be able to carry multiple services while ensuring end-to-end QoS. For a connectionless IP network, achieving quality of service is always a tricky issue. In recent years, the service quality assurance problem of IP networks has been greatly valued by operators, and equipment manufacturers have proposed different solutions for this. At present, the technical means for guaranteeing service quality are mainly as follows: shaping and rearranging traffic; solving the problem of head blocking; implementing non-blocking switching of the switching fabric.

In summary, in the router cluster, reliability is particularly important in the technology development trend, in which the reliability of the control plane is particularly concerned, and the control plane link provides a channel for control messages in the system. Currently, the interaction between the control plane messages in the router cluster is generally implemented through the central switch box, which is equivalent to a message relay station, and the control plane links of each line card chassis are connected to On the center frame. When a link or Ethernet switch unit fails, it may affect a box or multi-frame user service.

A device for implementing control plane interconnection in a router cluster, the first implementation scheme in the prior art is shown in FIG. The device is in active/standby mode. The two Ethernet switches in the chassis are in active/standby mode. Only the mainboard is switched, and the interconnect ports of the standby board are in the closed state. At a certain time, the main control board only The Ethernet switch board can send and receive packets through an Ethernet switch board. The center Ethernet switch board can only communicate with the link of an Ethernet switch board in the chassis. The disadvantages of this implementation are: There are multiple single points of failure, such as when the link between the two central switching frames fails, resulting in a relationship between the two central switching frames, between the line card frame and the central switching frame. The communication chain is broken, and even the entire router cluster crashes. When there is a problem with the active and standby signal lines of the two Ethernet switch boards in the frame, the active/standby switchover cannot be completed. Finally, the communication link between the boards of the entire frame and other frames is disconnected. In general, reliability and stability are low.

A device for implementing control plane interconnection in a router cluster, and a second implementation scheme in the prior art is shown in FIG. 2 . The device uses a dual-NIC mode, that is, the board in the frame, such as the main control board, uses the dual-NIC type. Each NIC is connected to an Ethernet switchboard in the frame. The two NICs can send and receive packets at the same time. The packet received by one NIC will not be sent to the Ethernet switchboard from another NIC. The two Ethernet switching units in the frame can participate in packet exchange at the same time. There is no active/standby signal line or network port connection between them. Although there is no single point of failure in the control plane link of this scheme, the disadvantage is that when there are two links faults, a frame and other frame communication links may be interrupted, for example, when the Ethernet switchboard The port connected to the central Ethernet switch board 41 is faulty, and the port connected to the Ethernet switch board 36 on the central Ethernet switch board 42 is faulty, which causes the communication between the line card frame and the two central switch frames to be broken. It can be seen that: 现有Using the existing technology, no matter which implementation scheme, the communication disconnection problem between the line card frame and the central switching frame cannot be avoided, and the reliability is very low. Currently, a highly reliable router cluster implementation board is urgently needed. The implementation of the interconnection. Summary of the invention

In view of the above, the main object of the present invention is to provide an apparatus and method for inter-board interconnection in a router cluster, which can improve reliability and solve the problem of communication disconnection between the line card frame and the central switching frame.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

An apparatus for interconnecting boards in a router cluster, the apparatus comprising: at least two central switching frames, a line card frame, and a central Ethernet switchboard connected between the at least two central switching frames, the device further comprising: The Ethernet switch boards in the line card frame are respectively connected to the central Ethernet switch boards in the at least two central switch frames.

The first Ethernet switch board in the line card frame is interconnected with the first center Ethernet switch board, and the first Ethernet switch board is interconnected with the second center Ethernet switch board.

The second Ethernet switch board in the line card frame is interconnected with the first center Ethernet switch board, and the second Ethernet switch board is interconnected with the second center Ethernet switch board.

The first central Ethernet switchboard is interconnected with each of the Ethernet switchboards located in the other central switch chassis, and the second central Ethernet switchboard is interconnected with each of the Ethernet switchboards located in the other central switch chassis.

When the first center Ethernet switch board itself fails, the communication between the central switch frame and the line card frame is established through the link between the interconnected first Ethernet switch board and the second center Ethernet switch board; or through the interconnected second Ethernet Establishing a communication between the central switching frame and the line card frame by using a link between the switch board and the second central Ethernet switch board;

When the second central switchboard itself fails, the communication between the central switch fabric and the line card frame is established through the link between the interconnected first Ethernet switchboard and the first central Ethernet switchboard; or, through the interconnected second Ethernet exchange A link between the board and the first central Ethernet switch board establishes communication between the central switch frame and the line card frame.

Wherein, when the first Ethernet switch board itself fails, the second Ethernet switch board and the first part are interconnected. Establishing a central switching frame and a line card through the link between the second Ethernet switchboard and the first central Ethernet switchboard. The link between the central switch fabric and the line card frame is established. Box communication

When the second Ethernet switch board itself is faulty, the communication between the central switch frame and the line card frame is established through the link between the first Ethernet switch board and the first center Ethernet switch board; or the first Ethernet switch board is interconnected. A communication between the central switching frame and the line card frame is established with the link between the second central Ethernet switchboard.

When the link between the first central Ethernet switchboard and the first Ethernet switchboard is faulty, the communication between the central switch fabric and the line card frame is established through the link between the first Ethernet switchboard and the second central Ethernet switchboard. Or establish a communication between the central switch frame and the line card frame through the link between the interconnected second Ethernet switch board and the first central Ethernet switch board; or through the interconnected second Ethernet switch board and the second center Ethernet switch board Linking between the central switch fabric and the line card frame; when the link between the second central Ethernet switch board and the second Ethernet switch board fails, the first Ethernet switch board interconnected with the first center Ethernet switch board Linking, establishing communication between the central switching frame and the line card frame; or establishing communication between the central switching frame and the line card frame through the link between the interconnected first Ethernet switching board and the second central Ethernet switching board; or through interconnection The link between the second Ethernet switchboard and the first central Ethernet switchboard establishes communication between the central switch frame and the line card frame.

A method for interconnecting boards in a router cluster, the method comprising: connecting at least two central switch boards between the central switch frames, the method further comprising: respectively: separating the Ethernet switch boards in the line card frame The central Ethernet switch boards are connected to at least two central switching frames.

The method further includes: interconnecting the first Ethernet switch board located in the line card frame with the first center Ethernet switch board, and interconnecting the first Ethernet switch board with the second center Ethernet switch board.

When the first center Ethernet switch board itself is faulty, the method further includes: establishing, by using a link between the first Ethernet switch board and the second center Ethernet switch board, establishing communication between the central switch frame and the line card frame; or a chain between the interconnected second Ethernet switchboard and the second central Ethernet switchboard Road, establishing communication between the central switching frame and the line card frame;

When the second center Ethernet switch board itself is faulty, the method further includes: establishing communication between the central switch frame and the line card frame by using a link between the first Ethernet switch board and the first center Ethernet switch board; or The link between the second Ethernet switchboard and the first central Ethernet switchboard establishes communication between the central switch frame and the line card frame.

When the first Ethernet switch board itself is faulty, the method further includes: establishing communication between the central switch frame and the line card frame by using a link between the interconnected second Ethernet switch board and the second central Ethernet switch board; or, Establishing a communication between the central switch fabric and the line card frame by connecting the second Ethernet switch board and the first center Ethernet switch board;

When the second Ethernet switch board itself is faulty, the method further includes: establishing communication between the central switch frame and the line card frame by using a link between the interconnected first Ethernet switch board and the first center Ethernet switch board; or, by interconnecting A link between the first Ethernet switchboard and the second central Ethernet switchboard establishes communication between the central switch frame and the line card frame.

When the link between the first central Ethernet switch board and the first Ethernet switch board is faulty, the method further includes: establishing a central switch frame by using a link between the first Ethernet switch board and the second center Ethernet switch board. Communication of the line card frame; or establishing communication between the central switch frame and the line card frame through the link between the interconnected second Ethernet switch board and the first central Ethernet switch board; or through the interconnected second Ethernet switch board and the second Establishing a communication between the central switch frame and the line card frame by the link between the central Ethernet switch boards;

When the link between the second central switchboard and the second Ethernet switchboard is faulty, the method further includes: establishing a central switch frame and a line card by using a link between the first Ethernet switchboard and the first central Ethernet switchboard. The communication between the chassis and the line card frame is established through the link between the first Ethernet switch board and the second center Ethernet switch board; or the second Ethernet switch board and the first center Ethernet are interconnected. The link between the switchboards establishes the communication between the central switch frame and the line card frame. In the device of the present invention, the Ethernet switch boards in the line card frame are respectively connected to the central Ethernet switch boards in at least two center switch frames.

By using the invention, since the interconnection covers all possible interconnections between the line card frame and the central switching frame in the device, the reliability is greatly improved, and the stability is also greatly improved, thereby solving the line card frame. Communication disconnection problem between the central exchange box. DRAWINGS

1 is a schematic structural diagram of an inter-board interconnection device of a router cluster in the prior art; FIG. 2 is a schematic structural diagram of an inter-board interconnection device of another router cluster in the prior art; Schematic diagram of the inter-board interconnection device of the router cluster. detailed description

The basic idea of the invention is that the Ethernet switch boards in the line card frame are respectively connected to the central Ethernet switch boards in at least two center switch frames.

It should be pointed out here that the "interconnection" in this paper is different from the "interconnection" which only includes physical connections in the general sense. The "interconnection" in this paper means the interconnection of control planes between boards, which has both physical connection and software control. The relationship of the connection is not described.

The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings.

A device for interconnecting boards in a router cluster, which mainly includes the following contents:

The device includes: at least two central switching frames, a line card frame, and a central Ethernet switchboard connected between the at least two central switching frames, the device further comprising: the Ethernet switchboards in the line card frame and the at least The central Ethernet switch boards are connected in the center switch boxes.

Here, the first center Ethernet switch board located in one center switch frame is interconnected with the second center Ethernet switch board located in the other center switch frame, and the first Ethernet switch board located in one line card frame is interconnected with the first center Ethernet switch board. The first Ethernet switchboard is interconnected with the second central Ethernet switchboard.

Here, the second Ethernet switch board located in the line card frame is interconnected with the first center Ethernet switch board, The second Ethernet switch board is interconnected with the second center Ethernet switch board.

Here, the first central Ethernet switch board is interconnected with each of the Ethernet switch boards located in the other central switch frame, and the second central Ethernet switch board is interconnected with each of the Ethernet switch boards located in the other central switch frame.

Here, when the first center Ethernet switch board itself fails, the communication between the central switch frame and the line card frame is established through the link between the interconnected first Ethernet switch board and the second center Ethernet switch board; or through the interconnected second Ethernet Establishing a communication between the central switching frame and the line card frame by using a link between the switch board and the second central Ethernet switch board;

Here, when the first Ethernet switch board itself fails, the communication between the central switch frame and the line card frame is established through the link between the interconnected second Ethernet switch board and the second central Ethernet switch board; or, through the interconnected second Ethernet Establishing a communication between the central switching frame and the line card frame by using a link between the switch board and the first central Ethernet switch board;

Here, when the link between the first central Ethernet switch board and the first Ethernet switch board is faulty, the communication between the central switch frame and the line card frame is established through the link between the interconnected first Ethernet switch board and the second center Ethernet switch board. Or establish a communication between the central switch frame and the line card frame through the link between the interconnected second Ethernet switch board and the first central Ethernet switch board; or through the interconnected second Ethernet switch board and the second center Ethernet switch board Link, establishing communication between the central switching frame and the line card frame; When the link between the second central Ethernet switchboard and the second Ethernet switchboard fails, the communication between the first Ethernet switchboard and the first central Ethernet switchboard is established, and communication between the central switch frame and the line card frame is established. Or establish a communication between the central switch frame and the line card frame through the link between the interconnected first Ethernet switch board and the second central Ethernet switch board; or through the interconnected second Ethernet switch board and the first center Ethernet switch board The link establishes communication between the central switching frame and the line card frame.

It should be noted here that multiple links between the central switch frame and the line card frame can implement link aggregation using the Link Aggregation Control Protocol (LACP). The benefit of this is to avoid loops. In order to solve the problem of communication disconnection between the line card frame and the central switch frame, in addition to the first center Ethernet switch, the first center Ethernet switch board, the second center Ethernet switch board, and the first Ethernet switch board are interconnected. The present invention increases the interconnection between the second central Ethernet switch board and the first Ethernet switch board. If the link aggregation is not used, the first center Ethernet switch board and the second center Ethernet A loop is formed between the switch board and the first Ethernet switch board, and after the link aggregation is performed, the first Ethernet switch board is respectively interconnected with the first center Ethernet switch board and the second center Ethernet switch board. A link is actually handled as a link aggregation group, which is equivalent to a link, thus avoiding loops.

It should be noted here that the present invention further solves the problem of communication disconnection between the line card frame and the central switching frame, and further increases other possible interconnections in the device, covering all possible interconnections in the device, and may include the interior of the central switching frame. Inter-board control plane interconnection, inter-board control plane interconnection inside the line card frame, inter-board control plane interconnection between the central switching frames, and inter-board control plane interconnection between the line card frame and the central switching frame. The benefit of this is that the reliability of the entire device is improved. Since this interconnection is a multi-level interconnection method and covers all possible interconnections in the device, the reliability is greatly improved, and the stability is greatly improved. The solution of the invention also relates to the technology of upgrading the control plane when the router cluster is expanded. The upgrade technology of the invention is safe, reliable, flexible and convenient, and can also ensure the smooth upgrade of the control plane. The board interconnected by the control plane of the board includes: a central Ethernet switch board and an Ethernet switch board, and includes The central Ethernet switch board and peripheral boards other than the Ethernet switch board, such as the main control board.

When the above-mentioned multi-level interconnection method uses the three-level switching mode, the first level is: the peripheral board is exchanged on the main control board; the second level is the exchange on the Ethernet switch board; the third level is the center Ethernet exchange. Exchange on the board.

For the central Ethernet switchboard, the central Ethernet switchboard is used to interconnect the interfaces in the router cluster, and the Ethernet switchboards of each frame are connected to the central Ethernet switchboard, thus implementing the hub for control communication between the interfaces. Features. The central Ethernet switchboard is implemented in both BOOT and major versions. When one central Ethernet switchboard is in the BOOT, the other can also implement the stacking function in the large version. For the BOOT, the BOOT refers to the degree of system startup. In order to adapt to an increasingly complex application environment in the electronic field, such as the communication industry and the automation industry, a corresponding main control central processor (CPU) is usually designed according to requirements. ), and BOOT is the basis for guiding the CPU system to start. For the large version, the large board is corresponding to BOOT. BOOT corresponds to the bios setting and hardware detection phase when the computer starts, that is, the stage before starting the operating system; and the large version corresponds to the operating system startup phase.

For the Ethernet switch board, the Ethernet switch board has two functions. One is to connect the central Ethernet switch board to communicate with other frames. The other is to establish the communication link between the peripheral boards in the frame. The communication between the peripheral boards of this frame must pass through the Ethernet switch board. The Ethernet switchboards in this subrack are connected to each other. The connected ports are the stacking ports. The stacking function of the Ethernet switch board is implemented. The peripheral board, such as the main control board, is only a whole, just like an Ethernet switchboard. . The Ethernet switchboard of the central switch chassis also needs to be connected to the central Ethernet switchboard of another central switch chassis. That is, the Ethernet switchboards of each chassis are connected to the central Ethernet switchboard. As a result, the redundancy of the link is achieved. Higher, the reliability will be improved accordingly.

For the peripheral boards except the central Ethernet switch board and the Ethernet switch board, the peripheral boards in each frame include the main control board, the line card, and the switching network board. Each peripheral board has its own board. The small switch chip, the peripheral board is connected to the Ethernet switch board in the frame through the small switch chip. Establish a communication link. In this way, the peripheral boards can communicate with each other through the Ethernet switch board. A peripheral board is connected to two Ethernet switches. The two links are connected to each other through LACP. Link aggregation allows one or more links to be aggregated together to form a link aggregation group. The link aggregation group is treated as a separate link, that is, the ability to present the same MAC interface to the MAC application layer. When a packet is sent through an aggregation group formed by two ports on the peripheral board, it is determined according to the load sharing principle, which port in the aggregation group is sent. Different types of packets may be sent from different ports, so that communication bandwidth and reliability are both Can improve.

It should be noted that the advantages of the link aggregation and stacking of the present invention are as follows: Compared with the prior art, the second scheme of the prior art has a further defect: the switching time of the dual network card is relatively slow. When the communication between the main control board 21 and the main control board 23 is reached, the egress switch board 31, the central Ether switch board 41, and the Ether switch board 35 are selected. When a link in the middle fails, it needs to be very After a long time can be detected, and then switch to other links, the long interruption of control plane communication will affect the user's business operation. In short, the reliability is relatively low, and the performance of link switching is also relatively low. The present invention implements link aggregation on all the boards through the small switch chip, and implements the stacking function on all the boards, and also implements the stacking function for the Ethernet switch board and the central Ethernet switch board. The redundancy of the link is higher, the reliability and stability are greatly improved, and the bandwidth is also increased. The boards can back up each other and share part of the load. On the other hand, one or several links appear in the system. The fault is detected for up to 100 milliseconds, and the control plane communication is restored. When an Ethernet switchboard or the central Ethernet switchboard is reset, the communication between other boards is normal after 100 milliseconds. The impact of this type of fault on control plane communication is extremely low. The central Ethernet switch board implements stacking in the BOOT. For the Ethernet switch board, it is not aware of whether it is in the BOOT or in the large version. In the BOOT, the startup time of the Ethernet switchboard in the control center is made, so that they have a sequence and have Time difference to enter the large version, so as to ensure that they do not enter the large version at the same time, because the BOOT to the large version needs to load the kernel image, the board does not have the swap function during the process of loading the kernel image. The communication interruption time between the boxes is relatively long. When they enter the large version when they are different, the system can be powered on and started to start, and the control plane communication between the frames will not be broken.

The invention is illustrated by way of example below.

Device embodiment:

As shown in FIG. 3, the control plane interconnection device in the router cluster of the present invention includes: two central switching frames and one line card frame. This is simplified for convenience of description. In fact, the interconnection of router clusters is generally one. Center switch box and four line card boxes, two center switch boxes and eight line card boxes, four center switch boxes, and sixteen line card boxes. The present invention is applicable to the above several interconnection modes. Each central switch chassis has a central Ethernet switch board. In a central switch frame and four line card frames, the central switch frame has two central Ethernet switch boards. Each frame has two Ethernet switch boards, and there are also some peripheral boards, such as line cards and main control boards. In order to explain the present invention more succinctly, each peripheral board is the same for the control plane interconnection. Now, only the main control board is taken as an example for explanation.

The following is a detailed description of the connections, link aggregation, and stacking of the various components in the device.

The boards in the chassis (the boards here include: the central Ethernet switch board, the Ethernet switch board, and the peripheral boards except the center Ethernet switch board and the Ethernet switch board, such as the main control board). For the central Ethernet switch board, it can be connected to the Ethernet switch board of the local chassis through the standby board or through the optical fiber. The ports of the standby board and the optical fiber ports can be aggregated into one link aggregation group. This physical difference is not seen for the LACP protocol.

The link between the main control board and the Ethernet switch board is used. The link ports on the main control board are negotiated with the ports on the Ethernet switch board to implement link aggregation. The two Ethernet switch boards are stacked on the main control board. It is like a single board, so you can aggregate several ports into one aggregation group, just like a port for the upper application. The main control board can have two or three ports, and even more ports are connected to one Ethernet switch board instead of one port, but at least one must be used to improve redundancy and reliability. . Number of interconnected ports It is mainly determined by the number of ports on the main control board d and the switch chip.

The ports on the peripheral boards are all set up, and they can also be aggregated. Then look at the operation and interconnection of the Ethernet switch board. The stacking link between the two Ethernet switch boards can be two or more. This is just a schematic diagram. If there are multiple, link aggregation is required, and stack packets are sent and received through the stack link. The Ethernet switch board of the center switch chassis needs to be connected to the central Ethernet switch board between the chassis. When a central Ethernet switch board fails, the control switch between the central switch frames and between the line card frame and the central switch frame is not controlled. Chain, and make the whole system paralyzed. The two Ethernet switch boards are connected to the central Ethernet switch board between the two switches to prevent two faults. If the central Ethernet switch board and an Ethernet switch board in the center switch chassis are faulty, this frame does not affect the frame. Other frame communication, the entire system can also run normally. Because the boards in the frame are inserted in the fixed slots, the number of slots is fixed. This ensures that the ports of the Ethernet switch board are connected to the same board in advance, and the ports connected to one board should be added. A link aggregation group, and finally knows which ports belong to a link aggregation group. Because the two central Ethernet switch boards implement the stack, the ports connected to the two central Ethernet switch boards also belong to an aggregation group. Fixed relationships can be statically aggregated using the LACP protocol. The connection between the Ethernet switch board and other boards is designed. The next step is to stack. The ports connected to the same card on the two Ethernet switch boards belong to a link aggregation group. They know each other's ports belong to which link aggregation group and whether the port is added to the link aggregation group. It is necessary to notify the other party through the timing synchronization and change synchronization of the stack information to maintain a stable stacking mode. The two synchronization modes are used to maintain the ports of the two Ethernet switch boards. That is, the other port is added to the link aggregation group on the card or removed from the link aggregation group, and the port and link aggregation group are implemented. The information is consistent. In the static aggregation mode, the port information is the information that the port is added to or removed from the link aggregation group and the link aggregation group number corresponding to the port. On the one hand, you need to synchronize the port information to the other party. You can synchronize the port information in the Ethernet switch board to another Ethernet switch board. After receiving the port information, compare and update the port information that you have reserved. On the other hand, change the synchronization port information to another Ethernet switch board. When the status of the board port is changed, the board will use this port. Add or delete from the link aggregation group, and immediately send a notification message to the other party. After the status information of the received port is changed, the link aggregation group corresponding to the port is added or deleted. . The two Ethernet switches need to maintain a global table of the ports that the other party has joined in the link aggregation group. The contents are: link aggregation group number of the port, port number, and module number of the port. The module number is the chip number of the device where the port resides. It is used to distinguish the Ethernet switch boards in the stack. After receiving the change synchronization or timing synchronization message of the other party, the information in the message is compared with the information in the global table, and the information in the global table is updated, thereby achieving synchronization between the information of the board and the other party. Timing synchronization ensures the consistency of the content in the global table. The synchronization synchronization ensures the real-time nature of the content in the global table. It only synchronizes once the port status changes, otherwise the change synchronization will not occur. Timing synchronization is mainly to make up for the lack of synchronization failure. If the synchronization fails, the timing synchronization can ensure the consistency of the information at both ends.

The stack synchronization information between the two Ethernet switch boards is not sent as a type of message.

The format of the LACP packet is the packet header of the LACP packet. The packet body stores the stack synchronization information. The advantage of this processing is that when two Ethernet switch boards can only send and receive LACP packets, but cannot send and receive other packets, the stack is prevented from being faulty, and the control plane communication is broken. Another advantage is that there is no need to know each other. The Internet Protocol (IP) address or Media Access Control (MAC) address of the other party's network port. The data contents of the stack synchronization are: link aggregation group number, port number, and synchronization type. Among them, the synchronization type specifies whether the synchronization or change synchronization. Synchronous synchronization only synchronizes the port number of the link aggregation group and the link aggregation group number of the port. The change synchronization only synchronizes the port number and port of the board that has just been deleted or added from the link aggregation group. Link aggregation group number, plus information added or deleted.

Finally, the stacking and link aggregation of the central Ethernet switchboard is performed, and the stacking and link aggregation are performed. The way is the same as the Ethernet switch board. The difference is that it implements the stacking function in the BOOT. When one central Ethernet switchboard is in the BOOT, the other can also be stacked in the large version. The stack information format in the BOOT and the processing of receiving the stack information should be the same as those in the large version. The calculation of the module number of the port on the central Ethernet switch board must also be consistent. When a central Ethernet switch board enters a large version from the BOOT, the stack port is disconnected, causing the link between the two central Ethernet switch boards to fail. In this case, the other should take this from the BOOT to the center in the large version. The port of the Ethernet switch is removed from the link aggregation group. After the large version is entered, the port connected to the Ethernet switch performs LACP packet negotiation. However, the static aggregation mode cannot be used because the ports are aggregated together. It is known that the system identifier of the LACP packet sent by each card in the system is represented by the chassis number, slot number, and CPU number. The port of the central Ethernet switch board is received. After the LACP packet is received, the chassis number of the other party is extracted, and the extracted chassis number is associated with the link aggregation group number to be added by the port. The rule is not only one type, as long as there is one type - corresponding The relationship is OK. Now set the rule as the rack number plus one. The value is the link aggregation group number. The rules for the two central Ethernet switch boards are Straight, so that between them there is no need to send additional information to determine the link aggregation group number. After the negotiation is successful, the port is added to the link aggregation group. If the stack port is added to the link aggregation group, the stack interface sends the stack information to the peer. The connection between the Ethernet switchboard and the Ethernet switchboard between the chassis is not as good as that of Figure 3. For example, an Ethernet switchboard can connect two or more ports to the central Ethernet switchboard, or one between them. The connection to one is not cross-connected, except that the connection shown in Figure 3 uses the least amount of fiber to maximize reliability. In the process of upgrading, there will be no upgrade failure due to the connection mode slightly different from Figure 3.

The connection and configuration between the board and the Ethernet switch board, the Ethernet switch board, and the center Ethernet switch board are completed. The control plane interconnection of the entire cluster is completed. The solution of the invention not only makes the control plane interconnection more secure and reliable, but also makes the interconnection between the line card frame and the central switching frame more convenient and flexible, and the connection between the links and the links does not affect the quality of the system communication. the amount.

Here, the method includes: interconnecting a first central Ethernet switch board located in one central switch frame with a second center Ethernet switch board located in another central switch frame, and the first Ethernet switch board located in a line card frame and the first The central Ethernet switchboard interconnects the first Ethernet switchboard with the second central Ethernet switchboard.

When the first central switchboard itself is faulty, the method further includes: establishing, by the link between the interconnected first Ethernet switchboard and the second central Ethernet switchboard, establishing communication between the central switch frame and the line card frame; or Establishing a communication between the central switch fabric and the line card frame by connecting the second Ethernet switch board and the second center Ethernet switch board;

Here, when the first Ethernet switch board itself is faulty, the method further includes: establishing communication between the central switch frame and the line card frame by using a link between the interconnected second Ethernet switch board and the second center Ethernet switch board; or Establishing a communication between the central switch fabric and the line card frame by connecting the second Ethernet switch board and the first center Ethernet switch board;

Here, when the link between the first central Ethernet switch board and the first Ethernet switch board is faulty, the method The method further includes: establishing communication between the central switch frame and the line card frame by using a link between the interconnected first Ethernet switch board and the second central Ethernet switch board; or connecting the second Ethernet switch board and the first center Ethernet through the interconnected The communication between the central switching frame and the line card frame is established by the link between the switchboards, or the communication between the central switch frame and the line card frame is established through the link between the second Ethernet switch board and the second central Ethernet switch board;

When the link between the second central switchboard and the second Ethernet switchboard is faulty, the method further includes: establishing a central switch frame and a line card by using a link between the first Ethernet switchboard and the first central Ethernet switchboard. The communication between the chassis and the line card frame is established through the link between the first Ethernet switch board and the second center Ethernet switch board; or the second Ethernet switch board and the first center Ethernet are interconnected. The link between the switchboards establishes the communication between the central switch frame and the line card frame.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A device for interconnecting boards in a router cluster, the device comprising: at least two central switching frames and a line card frame, wherein the central Ethernet switch boards are connected between the at least two central switching frames, wherein The device further includes: the Ethernet switch boards in the line card frame are respectively connected to the central Ethernet switch boards in the at least two center switch frames.

2. The device according to claim 1, wherein the first Ethernet switch board located in the line card frame is interconnected with the first center Ethernet switch board, the first Ethernet switch board and the second center Ethernet switch board. interconnected.

The device according to claim 1, wherein the second Ethernet switch board located in the line card frame is interconnected with the first center Ethernet switch board, and the second Ethernet switch board and the second center Ethernet switch board interconnected.

4. The device according to claim 1, wherein the first central Ethernet switch board is interconnected with each of the Ethernet switch boards located in the other central switch frame, and the second central Ethernet switch board and the other central switch frame are located. Each Ethernet switch board is interconnected.

The device according to claim 2 or 3, wherein when the first central Ethernet switch board itself fails, a center is established through a link between the interconnected first Ethernet switch board and the second center Ethernet switch board. The communication between the switch box and the line card frame is established; or the communication between the central switch frame and the line card frame is established through the link between the interconnected second Ethernet switch board and the second center Ethernet switch board;

When the second central Ethernet switch board itself fails, the communication between the central switch frame and the line card frame is established through the link between the interconnected first Ethernet switch board and the first central Ethernet switch board; or, through the interconnected second Ethernet The switch between the switchboard and the first central Ethernet switchboard establishes communication between the central switch frame and the line card frame.

The device according to claim 2 or 3, wherein when the first Ethernet switch board itself fails, a center switch is established through a link between the interconnected second Ethernet switch board and the second center Ethernet switch board. The communication between the frame and the line card frame; or, through the interconnected second Ethernet switch board and the The communication between the central switch fabric and the line card frame is established by the link between the central Ethernet switch boards; and the link between the first Ethernet switch board and the first center Ethernet switch board when the second Ethernet switch board itself fails. The communication between the central switch frame and the line card frame is established. The communication between the central switch frame and the line card frame is established through the link between the first Ethernet switch board and the second center Ethernet switch board.

The device according to claim 2 or 3, wherein when the link between the first central Ethernet switchboard and the first Ethernet switchboard fails, the first Ethernet switchboard is interconnected with the second central Ethernet switch. The communication between the central switch frame and the line card frame is established by the link between the boards; or the communication between the central switch frame and the line card frame is established through the link between the second Ethernet switch board and the first central Ethernet switch board; or Establishing communication between the central switching frame and the line card frame through the link between the interconnected second Ethernet switch board and the second central Ethernet switch board;

When the link between the second central Ethernet switchboard and the second Ethernet switchboard is faulty, the communication between the central switch fabric and the line card frame is established through the link between the interconnected first Ethernet switchboard and the first central Ethernet switchboard; Or establishing communication between the central switch frame and the line card frame through the link between the interconnected first Ethernet switch board and the second central Ethernet switch board; or through the interconnection between the second Ethernet switch board and the first center Ethernet switch board Link, establishes communication between the central switching frame and the line card frame.

A method for interconnecting boards in a router cluster, the method comprising: connecting a central Ethernet switch board between at least two central switch frames, wherein the method further comprises: placing the line card frame The Ethernet switchboards in the middle are respectively connected to the central Ethernet switchboards in the at least two central switch frames.

The method according to claim 8, wherein the method further comprises: interconnecting the first Ethernet switch board located in the line card frame with the first center Ethernet switch board, and switching the first Ethernet switch The board is interconnected with the second central Ethernet switch board.

The method according to claim 9, wherein when the first central Ethernet switch board itself fails, the method further includes: interconnecting the first Ethernet switch board and the second center The communication between the central switch chassis and the line card frame is established through the link between the Ethernet switch boards. The communication between the central switch frame and the line card frame is established through the link between the second Ethernet switch board and the second central Ethernet switch board. ;

When the second central switchboard itself is faulty, the method further includes: establishing communication between the central switch frame and the line card frame by using a link between the interconnected first Ethernet switchboard and the first central Ethernet switchboard; or The communication between the central switching frame and the line card frame is established through the link between the interconnected second Ethernet switchboard and the first central Ethernet switchboard.

The method according to claim 9, wherein when the first Ethernet switch board itself fails, the method further includes: connecting, by the interconnected second Ethernet switch board, the link between the second central Ethernet switch board and the second central Ethernet switch board And establishing communication between the central switching frame and the line card frame; or establishing communication between the central switching frame and the line card frame by using a link between the interconnected second Ethernet switch board and the first central Ethernet switch board;

When the second Ethernet switch board itself is faulty, the method further includes: establishing, by using a link between the first Ethernet switch board and the first center Ethernet switch board, establishing communication between the central switch frame and the line card frame; or A link between the interconnected first Ethernet switchboard and the second central Ethernet switchboard establishes communication between the central switch frame and the line card frame.

The method according to claim 9, wherein when the link between the first central Ethernet switchboard and the first Ethernet switchboard fails, the method further includes: interconnecting the first Ethernet switchboard and the first The communication between the central switch fabric and the line card frame is established by the link between the two central Ethernet switch boards. The central switch frame and the line card frame are established through the link between the second Ethernet switch board and the first central Ethernet switch board. The communication between the central switch frame and the line card frame is established through the link between the interconnected second Ethernet switch board and the second central Ethernet switch board;

When the link between the second central Ethernet switch board and the second Ethernet switch board is faulty, the method further includes: establishing a central switch frame by using a link between the interconnected first Ethernet switch board and the first central Ethernet switch board Communication of the line card frame; or through the interconnected first Ethernet switch board and the second center The communication between the central switch chassis and the line card frame is established by the link between the Ethernet switch boards, or the communication between the central switch frame and the line card frame is established through the link between the second Ethernet switch board and the first center Ethernet switch board. .