WO2009094914A1

WO2009094914A1 - Bridge system and method for point-to-point link and sharing link

Info

Publication number: WO2009094914A1
Application number: PCT/CN2009/070051
Authority: WO
Inventors: Lin Li
Original assignee: Zte Corporation
Priority date: 2008-01-25
Filing date: 2009-01-07
Publication date: 2009-08-06
Also published as: CN101222409A; CN101222409B

Abstract

A bridge system and method for point-to-point link and sharing link. The system comprises: one or more remote devices, one or more computers, and a bridge equipment. The bridge equipment carries out point-to-point connection with the remote device by a transmission device, and carries out sharing link connection with a computer by an Ethernet network.

Description

Bridge system and method for point-to-point link and shared link

TECHNICAL FIELD The present invention relates to the field of computer network communications, and in particular, to a bridge device for inter-network protocol forwarding between a point-to-point link and a shared link, and an implementation method for internet protocol forwarding based thereon. A multi-service access node (MSAN) and a multi-service access gate (MSAG) are next-generation access network devices that provide both voice services and data services. The network management is usually a simple network management protocol (SNMP) based on the Internet Protocol (IP) standard. The traditional access network device is a pure voice service system. Network management is often based on non-standard custom protocols. Because the access device of the traditional voice-only service is inconsistent with the network management protocol of the MSAN/MSAG, the access device of the traditional voice-only service and the MSAN/MSAG hybrid network are not supported. Instead, the traditional access device and the MSAN are used. /MSAG separates the network, or replaces the traditional access device with the MSAN/MSAG device, and device replacement obviously increases maintenance and investment costs. At present, the main application of the data service in the telecom field is still the traditional voice service. The voice service is mainly based on the Time Division Multiple (TDM) network, and the E1/T1 interface provided by the transmission system will be physically Each remote access device is connected. The data service is mainly based on Ethernet. The network management mainly adopts a simple network management protocol. Simple network management protocol information and data service information are usually transmitted on the same Ethernet. It is well known that Ethernet based on shared medium is vulnerable to virus infection or malicious attack. In this way, the security of network management information cannot be effectively guaranteed. In addition, each remote device on the Ethernet needs to be assigned a public Media Access Control (MAC) address. Because the telecommunication device usually has two boards, the main and the standby, allocate and manage the main and The MAC address of the standby board is increased by the complexity of management and maintenance. If the network management protocol information and the broadband service information are isolated in two independent Ethernet networks, although the security of the network management protocol information can be guaranteed, setting two independent Ethernet networks will greatly increase the investment cost of the equipment. It can be seen that an effective solution has not been proposed for the problem that the SNMP protocol cannot be reliably and efficiently transmitted in the related art. SUMMARY OF THE INVENTION The present invention has been made in view of the problems in the related art that the SNMP protocol cannot be transmitted reliably and efficiently. To this end, the main object of the present invention is to provide an improved bridge between a point-to-point link and a shared link. The solution to solve the above problems in the related art. According to one aspect of the invention, a bridge system for point-to-point links and shared links is provided. The bridge system of the point-to-point link and the shared link according to the present invention includes: one or more remote devices and one or more computers, wherein the method further includes: a bridge device that performs a point-to-point with the remote device through the transmission device Connect the link and connect to the shared link of the computer through the Ethernet network. Further, in the system, the bridging device includes: a processor, an advanced data link controller, a point-to-point chip, and an Ethernet controller, wherein the processor is connected to the advanced data link controller and the shared link through the bus And the advanced data link controller is connected to the point-to-point chip. The bridging device further includes: a time division multiplexing system switching network for connecting the advanced data link controller and the point to point chip. Further, in the system, the remote device includes: a processor, an advanced data link controller, and a point-to-point chip, wherein the processor is connected to the advanced data link controller through the address bus and the data bus, and the advanced data The link controller is connected to a point-to-point chip. The remote device also includes: a time division multiplexing system switching network for connecting the advanced data link controller with the point to point chip. In addition, in the system, the transmission device includes: a shared link switching network, configured to aggregate and cross connect a plurality of remote devices. In addition, in this system, the point-to-point link is an E1/T1, HW link or serial interface, and the shared link is an Ethernet or peripheral component interconnect bus. In addition, in this system, the point-to-point chip is an E1/T1, HW chip or a serial port chip. According to another aspect of the present invention, a point-to-point link and a shared link bridge are provided. The method for point-to-point link and shared link bridging according to the present invention includes: the bridging device obtaining the public IP address of the remote device and the corresponding point-to-point link from the free address resolution protocol packet sent by the remote device; When receiving the address resolution protocol packet sent by the computer, the bridge device obtains the destination IP address of the address resolution protocol packet, and compares the destination IP address of the address resolution protocol packet with the public IP address of the remote device. If the comparison result is the same, Sending an address resolution protocol response packet to the computer; after receiving the address resolution protocol response packet, the computer obtains the MAC address corresponding to the IP address of the remote device as the MAC address of the bridge device, and sends the IP packet to the bridge device; and the bridge device After receiving the IP packet, the IP packet is forwarded to the remote device through the corresponding point-to-point link to establish an IP channel between the computer and the remote device. In addition, in the method, in the free address resolution protocol packet, the source IP address is a public IP address of the remote device, and the source MAC address is any default value. In addition, in the method, the free address resolution protocol packet is transmitted to the bridge device through a point-to-point link through a convergence or cross-connection of the transmission device. In addition, in the method, in the address resolution protocol response packet, the source MAC address is a public MAC address of the bridge device, and the source IP address is a public IP address of the remote device. In addition, in the method, in the IP packet, the source MAC address is a public MAC address of the computer, the source IP address is a public IP address of the computer, the destination MAC address is a public MAC address of the bridge device, and the destination IP address is The public IP address of the remote device. With the above aspect of the present invention, the IP protocol between the remote device on the point-to-point link and the computer on the shared link can be securely and reliably transmitted through the bridge device of the point-to-point link and the shared link, thereby Efficient use of existing E1/T1 point-to-point link resources while reducing maintenance and investment costs. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawing: 1 is a schematic structural diagram of a bridge system of a point-to-point link and a shared link according to an embodiment of the present invention; FIG. 2 is a flowchart of a method for bridging a point-to-point link and a shared link according to an embodiment of the present invention; 3 is a schematic diagram of hardware implementation according to an embodiment of the present invention; and FIG. 4 is a flow chart of IP protocol forwarding between a remote device on a point-to-point link and a computer on a shared link according to an embodiment of the present invention; . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a bridge system and method for point-to-point links and shared links, in view of the problem that the SNMP protocol cannot be transmitted in a reliable manner. Telecom equipment has a wealth of E1/T1 resources, and E1/T1 is a point-to-point, full-duplex coaxial transmission medium. The existing E1/T1 resource transmission SNMP protocol can protect the existing investment of the telecom operator, and can effectively isolate the network management information flow and the service information flow, ensure the reliable transmission of the network management information flow, and can use SNMP. The protocol supports the hybrid networking of access network equipment and integrated access network equipment of traditional pure narrowband services, thereby reducing maintenance and investment costs. The preferred embodiments of the present invention are described in the following with reference to the accompanying drawings, which are intended to illustrate and illustrate the invention. The features of the embodiments of the present invention and the embodiments may be combined with each other if they do not conflict. FIG. 1 is a block diagram showing a structure of a bridge system of a point-to-point link and a shared link according to an embodiment of the present invention. As shown in FIG. 1, the system includes: one or more remote devices and one or more computers, and a bridge device, wherein the bridge device connects to the remote device through a point-to-point link through the transmission device, and passes through the Ethernet The network and the computer are connected to the shared link. The transmission device used by the bridging device to connect to the remote device may be a shared link switching network for converging and cross-connecting multiple remote devices. The above point-to-point link may be an E1/T1, HW link or a serial interface, and the shared link may be So Ethernet or peripheral components interconnect bus; point-to-point chip can be E1/T1, HW chip or serial chip.

(i) The bridging device bridging device includes: a processor, an advanced data link controller, a point-to-point chip, and an Ethernet controller, wherein the processor is connected to the advanced data link controller and the shared link through the bus, and The advanced data link controller is connected to the point-to-point chip. Preferably, the bridging device further comprises: a time division multiplexing system switching network for connecting the advanced data link controller and the point to point chip.

(2) The remote device remote device includes: a processor, an advanced data link controller, and a point-to-point chip, wherein the processor is connected to the advanced data link controller through the address bus and the data bus, and the advanced data link The path controller is connected to the point-to-point chip. Preferably, the remote device further comprises: a time division multiplexing system switching network for connecting the advanced data link controller and the point to point chip. 2 is a flow chart showing a method of bridging a point-to-point link and a shared link according to an embodiment of the present invention. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. As shown in FIG. 2, the method includes: Step S202: The bridge device obtains the public IP address of the remote device and the corresponding point-to-point link from the free address resolution protocol packet sent by the remote device. Step S204, the bridge device receives When the address resolution protocol packet sent by the computer is obtained, the destination IP address of the address resolution protocol packet is obtained, and the destination IP address of the address resolution protocol packet is compared with the public IP address of the remote device, and if the two are the same, the address is sent to the computer. Parsing the protocol response packet; step S206, after receiving the address resolution protocol response packet, the computer obtains the MAC address corresponding to the IP address of the remote device as the MAC address of the bridge device, and sends the IP packet to the bridge device; Step S208, the bridge device After receiving the IP packet, the IP packet is forwarded to the remote device through the corresponding point-to-point link to establish an IP channel between the computer and the remote device. Preferably, in step S202, the free address resolution protocol packet is transmitted to the bridge device through a point-to-point link through a convergence or cross-connection of the transmission device. The individual data packets are described below.

1. In the free address resolution protocol package, the source IP address is the public IP address of the remote device. The source MAC address is any default value.

2. In the address resolution protocol response packet, the source MAC address is the public MAC address of the bridge device, and the source IP address is the public IP address of the remote device.

3. In the IP packet, the source MAC address is the public MAC address of the computer, the source IP address is the public IP address of the computer, the destination MAC address is the public MAC address of the bridge device, and the destination IP address is the public address of the remote device. IP address. FIG. 3 shows a hardware implementation schematic diagram of an embodiment of the present invention. In FIG. 3, the bridging device includes a bridging system 100, a remote system 200, a transmission system 300, an Ethernet network 400, and a computer 500, although only one remote system 200, transmission system 300, Ethernet network 400, and Computer system 500, but there may be more remote systems 200, transmission systems 300, Ethernet networks 400, and computer systems 500 in the system. The bridging system 100 includes a central processing unit (CPU) 110, a high-level data link controller (HDLC) 120, a TDM switching network 130, an El/Tl 140, and an ether. Network controller 150. The CPU 110 connects the HDLC controller 120 and the Ethernet controller 140 via an address, a data bus, and a control signal. The HDLC controller 120 is connected to the E1/T1 chip 140 via the TDM switching network 130. The remote system 200 includes a processor CPU 210, an HDLC controller 220, a TDM switching network 230, and an El/Tl 240. The CPU 210 is connected to the HDLC controller 220 via an address, a data bus, and a control signal, and the HDLC controller 220 is connected to the E1/T1 chip 240 through the TDM switching network 230. The E 1/T 1 interface between the bridge system 100 and the remote system 200 is connected through a transmission system 300, which includes a TDM switching network 310 that can aggregate and cross connect multiple remote systems. The Ethernet controller 150 of the bridge system 100 is coupled to the Ethernet controller 520 of the computer 500 via an Ethernet network 400. For a point-to-point link, only the E1/T1 link is described in this example, but the point-to-point link can also be an HW link, a serial port, or the like. For Ethernet, it can also be other shared links, such as Peripheral Component Interconnect Special Interest Grou (PCI) bus. Some processors in this embodiment may be, for example, a CPU of the MPC8260 series of Freescale, which integrates a multi-channel HDLC controller (MCC) and a fast Ethernet controller. (Fast Ethernet Controller, FCC for short), where MCC supports super channel function, which can realize N* 64bps transmission on logical channels composed of several time slots. Programmable devices such as FPGAs, CPLDs may be used in this embodiment to implement the TDM switching function of the TDM switching network 130/230/330 or the bridging function of the bridge system 110. Some functions in this embodiment may be omitted. For example, the TDM switching network of the bridge device 100, the remote system 200, or the transmission system 300 may be omitted. Some of the functions in this embodiment can also be combined. For example, the bridge device 100 can be inserted into the computer system as an interface card, so that the computer 500 simultaneously assumes the functions of the bridge device 100. 4 is a flow diagram showing IP protocol forwarding between a remote device on a point-to-point link and a computer on a shared link in accordance with an embodiment of the present invention. As shown in FIG. 4, on the basis of the apparatus of the present invention, several main processes of the point-to-point E1/T1 link and the shared link Ethernet bridge device in this example are further described below. Prior to performing the process illustrated in FIG. 4, the physical connections of the bridge system 100, the remote system 200, the transmission system 300, the Ethernet network 400, and the computer 500 have been completed and started, and the remote system 200 passes through the transmission system 300, the bridge system 100. IP communication is performed between the Ethernet network 400 and the computer system 500. The process shown in FIG. 4 includes the following steps: Step S402: The CPU 210 of the remote system 200 sends a free address resolution protocol (ARP) packet to a logical channel of the HDLC controller 220. The source IP address is the public IP address of the remote system, and the source MAC address can be any default value. Step S404, the remote system 200 sends a free ARP packet, and the free ARP packet passes through the transmission system 300 to the bridge system 100. The bridge system learns the IP address of the remote system 200 and the corresponding E1/T1 from the received free ARP packet. Port number and corresponding time slot. In step S406, the computer 500 sends an ARP packet. In the ARP packet, the destination IP address is the IP address of the remote system 200. Step S408, after the ARP packet of the network port of the system 100 is bridged, the computer 500 is learned. The IP address and the MAC address, and the destination IP address of the ARP packet is the IP address of the remote system 200 learned by itself, and then the ARP response packet is sent. In the ARP response packet, the source MAC address is the bridge system 100 itself. The MAC address and source IP address are the IP addresses of the remote system 200. Step S410: After receiving the ARP reply packet, the network port of the computer system 500 learns that the MAC address corresponding to the IP address of the remote system 200 is the MAC address of the bridge system 100. Step S412, the computer system 500 sends an IP packet, in which the source MAC is the MAC address of the computer system 500 itself, the source IP address is the IP address of the computer system 500 itself, the destination MAC address is the MAC address of the bridge system 100, and the destination The IP address is the IP address of the remote system 200. Step S414: After the bridge system 100 receives the IP packet sent by the computer 100 as the IP packet of the remote system 200, the bridge system 100 forwards the IP packet to the E1/T1 link corresponding to the remote system 200. Step S416, after receiving the IP packet forwarded by the bridge system 100 to the IP packet of the computer system 500, the remote system 200 learns the MAC address corresponding to the IP address of the computer system 500. Step S418, the remote system 200 sends the IP packet whose destination IP address is the computer system 500 through the E1/T1 interface. Step S420: After receiving the IP packet whose destination IP address is the computer system 500 from the El/T1 interface, the bridge system 100 tampers with the source MAC address as its own MAC address, and forwards it to the computer system 500 through the network port. Step S422, the computer system 500 receives the remote system 200 forwarded by the bridge system 100.

IP package. Step S424, the remote system 200 sends the ARP packet whose destination IP is the computer system 500 to the E1/T1 interface. In step S426, the bridge system 100 receives the ARP packet sent by the remote system 200, and changes the source MAC to itself and forwards it through the network port. Step S428, the computer system 500 receives the ARP packet forwarded by the bridge system as its own ARP packet, and sends the ARP response packet whose destination IP address is the remote system 200 to the bridge system. In step S430, the bridge system receives the ARP response packet sent by the computer system 500 to the remote system 200, and learns the MAC address corresponding to the IP address of the computer system 500, and forwards the MAC address to the remote system 200 through the E1/T1 interface. Step S432, the remote system 200 receives the ARP response packet sent by the computer system 500 forwarded by the bridge system from the E1/T1 interface, and learns the MAC address corresponding to the IP address of the computer system 500. As described above, in the above embodiment, except that the bridge device 100 is a newly added device, the remote system 200, the transmission system 300, the Ethernet network 400, and the computer system 500 are existing resources, so that the existing existing can be effectively protected. investment. The hardware and software functions implemented by the bridge system 100 are relatively simple, and development, implementation, and maintenance are relatively easy. On the point-to-point link, only ARP and IP packets are transmitted, which can improve the bandwidth utilization of the point-to-point link. The point-to-point link ensures secure and reliable transmission between the remote system 200 and the computer system 500. At the same time, since the remote device 200 omits the MAC address allocation and management of the point-to-point link, maintenance costs can be reduced. In addition, the above description of the example only relates to IP communication between the remote system 200 and the computer system 500, but the present invention is not limited thereto. For example, a plurality of remote systems 200 may also perform IP communication through a bridge device. In addition, IP packets can also be packets in other formats. In summary, with the embodiment of the present invention, the IP protocol security between the remote device on the point-to-point link and the computer on the shared link can be realized by the bridge device of the point-to-point link and the shared link. Reliable transmission enables efficient use of existing E1/T1 point-to-point link resources while reducing maintenance and investment costs. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A bridge system for a point-to-point link and a shared link, comprising: one or more remote devices and one or more computers, further comprising:

The bridging device performs a point-to-point link connection with the remote device through the transmission device, and performs a connection of the shared link with the computer through the Ethernet network.

2. The bridge system according to claim 1, wherein the bridge device comprises: a processor, a high-level data link controller, a point-to-point chip, and an Ethernet controller, wherein the processor passes A bus is coupled to the advanced data link controller and the shared link, and the advanced data link controller is coupled to the point to point chip.

The bridge system according to claim 2, wherein the bridge device further comprises: a time division multiplexing system switching network, configured to connect the advanced data link controller and the point to point chip.

The bridge system according to claim 1, wherein the remote device comprises: a processor, a high-level data link controller, and a point-to-point chip, wherein the processor is connected to the bus through the bus An advanced data link controller is coupled and the advanced data link controller is coupled to the point to point chip.

The bridge system according to claim 4, wherein the remote device further comprises: a time division multiplexing system switching network, configured to connect the advanced data link controller and the point to point chip.

The bridge system according to claim 1, wherein the transmission device comprises: a shared link switching network, configured to aggregate and cross connect the plurality of remote devices.

The bridge system according to any one of claims 1 to 6, wherein the point-to-point link is an E1/T1, HW link or a serial interface, and the shared link is an Ethernet Network or peripheral component interconnect bus.

The bridge system according to any one of claims 1 to 6, wherein the point-to-point chip is an E1/T1, an HW chip, or a serial port chip.

A method for implementing a point-to-point link and a shared link bridging by using the bridging system according to any one of claims 1 to 6, characterized in that it comprises:

The bridging device obtains the public IP address of the remote device and the corresponding point-to-point link from the free address resolution protocol packet sent by the remote device;

When the bridging device receives the address resolution protocol packet sent by the computer, the bridging device obtains the destination IP address of the address resolution protocol packet, and performs the destination IP address of the address resolution protocol packet with the public IP address of the remote device. Comparing, if the comparison result is the same, sending an address resolution protocol response packet to the computer;

After receiving the address resolution protocol response packet, the computer obtains a MAC address corresponding to the IP address of the remote device as a MAC address of the bridge device, and sends an IP packet to the bridge device;

After receiving the IP packet, the bridging device forwards the IP packet to the remote device through a corresponding point-to-point link to establish an IP between the computer and the remote device aisle.

The method according to claim 9, wherein in the free address resolution protocol packet, the source IP address is a public IP address of the remote device, and the source MAC address is any default value.

The method according to claim 9, wherein the free address resolution protocol packet is transmitted to the bridge device via a point-to-point link through a convergence or cross-connection of a transmission device.

The method according to claim 9, wherein in the address resolution protocol response packet, the source MAC address is a public MAC address of the bridge device, and the source IP address is a public device of the remote device. IP address.

13. The method according to claim 9, wherein in the IP packet, the source MAC address is a public MAC address of the computer, and the source IP address is a public IP address of the computer. The destination MAC address is the public MAC address of the bridge device, and the destination IP address is the public IP address of the remote device.