WO2012167681A1

WO2012167681A1 - Transmission device and method for distributing information thereof

Info

Publication number: WO2012167681A1
Application number: PCT/CN2012/075398
Authority: WO
Inventors: 梁树国
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-07
Filing date: 2012-05-11
Publication date: 2012-12-13
Also published as: CN102820946A; CN102820946B

Abstract

Disclosed are a transmission device and a method for distributing information thereof. The method includes: a transmission device setting up its own identification information to be distributed; the transmission device padding a relatively short data packet with said own identification information, the length of said data packet being less than the encapsulation length of an Ethernet frame; the transmission device outputting the relatively short data packet to a lower-level device. By means of enabling a transmission device to distribute its own identification information, the present invention solves the problem in the prior art that, in the initial stages of network establishment or during network upgrades, service configuration errors may occur during device switching due to there being no OAM information available. The invention facilitates identification and processing at the receiver end and ensures that cables are correctly connected.

Description

The present invention relates to the field of communications technologies, and in particular, to a transmission device and a method for distributing the same. BACKGROUND OF THE INVENTION Under the trend of metropolitan area network IP, the evolution of transmission equipment has changed from "multi-service interface adaptability" to "multi-service kernel adaptability". At this time, the PTN (Packet Transport Network) network came into being.

PTN is a comprehensive transmission technology that uses packet as a transmission unit and carries carrier-class Ethernet services, and is compatible with services such as TDM (Time Division Multiplex and Multiplexer) and ATM (Asynchronous Transfer Mode). Although the PTN network provides end-to-end hierarchical OAM (Operation Administration and Maintenance) functions, these functions need to be configured after the network is deployed to function properly; and if the configuration is incorrect The function of OAM also does not work. In the initial stage of network construction, and when device switching occurs in network upgrades, some basic information is required, mainly where each fiber or cable comes from, which port of the board to connect to, and so on. When the OAM function is not configured, it does not work well. Since there is no OAM information available at this time, the correct connection of the cable cannot be guaranteed. If the cable connection is incorrect, there is no way to correctly configure the service. SUMMARY OF THE INVENTION The embodiments of the present invention provide a transmission device and a method for distributing information thereof, which are used to solve the problem that the service configuration is incorrect due to the lack of available OAM information during the initial stage of network construction or when the network upgrade occurs. In order to solve the above technical problem, the technical solution adopted by the embodiment of the present invention is as follows: On the one hand, the embodiment of the present invention provides a method for transmitting information by a transmission device, including: setting, by the transmission device, self-identification information to be advertised; The transmission device fills the self-identification information in a shorter data packet, where the length of the shorter data packet is smaller than the encapsulation length of the frame in the Ethernet; and the transmission device outputs the shorter data packet to the lower-level device. The shorter data packet is a shorter data packet transmitted during the current communication process of the transmission device, and/or a shorter data packet actively issued by the transmission device. Further, when the shorter data packet is a shorter data packet transmitted during a current communication process of the transmission device, the transmission device fills the self-identification information in a padding byte of the shorter data packet. Further, the short data packet transmitted by the transmission device in the current communication process is an address resolution protocol ARP protocol data packet; the short data packet actively issued by the transmission device is a free ARP protocol data packet. Further, the self-identification information includes physical location information of the transmission device. In another aspect, the embodiment of the present invention further provides a transmission device, including: an information setting module, configured to set self-identification information to be advertised; a data packet filling module, configured to fill the self-identification information in a short data packet The length of the shorter data packet is smaller than the encapsulation length of the frame in the Ethernet; the data packet sending module is configured to output the shorter data packet to the lower device. The shorter data packet in the data packet filling module is a shorter data packet transmitted during the current communication process of the transmission device, and/or a shorter data packet actively issued by the transmission device. Further, when the shorter data packet is a shorter data packet transmitted during a current communication process of the transmission device, the data packet filling module is configured to fill the self-identification information in the filling of the shorter data packet. In bytes. Further, the self-identification information set by the information setting module includes physical location information of the transmission device. The beneficial effects of the embodiments of the present invention are as follows: The method and apparatus according to the embodiments of the present invention make full use of existing resources, use original meaningless padding bytes, transmit meaningful information of their own, and actively publish their own information. Let the peer recognize its identity and ensure the correct connection of the cable. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor. 1 is a structural diagram of two frame formats in an existing standard; FIG. 2 is a structural diagram of a short data packet according to an embodiment of the present invention; FIG. 3 is a flowchart of a method for transmitting information by a transmission device according to Embodiment 1 of the present invention; 4 is a schematic diagram of the self-identification information set by the embodiment of the present invention; FIG. 5 is a flowchart of a method for the transmission device to actively publish its own information according to the second embodiment of the present invention; FIG. 7 is a schematic structural diagram of a transmission device according to an embodiment of the present invention; FIG. 8 is a schematic structural diagram of an apparatus according to an embodiment of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention. The embodiment of the invention provides a transmission device and a method for releasing the information, so that the transmission device can provide its own information at any time, which facilitates the identification and processing of the receiver, ensures the correct connection of the cable, and realizes the correct configuration of the service. . Specifically, the embodiment of the present invention considers that the key feature of the PTN is to implement packet-based switching to support multi-services; and the bearer services are mainly carrier-class Ethernet services. In the TCP/IP world, the encapsulation of Ethernet IP datagrams is defined in RFC 894, and the IP datagram encapsulation of IEEE 802 networks is defined in RFC 1042. Both the frame defined by the 802.3 standard and the frame of the Ethernet have minimum length requirements. 802.3 specifies that the data portion must be at least 38 bytes, and for Ethernet, a minimum of 46 bytes is required. To ensure this, padding (PAD) bytes must be inserted in insufficient space. As shown in Figure 1, two different forms of encapsulation are given. The numbers below each box in the figure are their byte lengths. The method in the embodiment of the present invention uses the padding bytes in the shorter data packet to deliver some useful information.

OAM information, as a short packet is sent, actively transmits its own information. The specific format of the shorter message is shown in Figure 2, where the data part consists of valid information and padding bytes. Several preferred embodiments of the present invention will be described below with reference to FIG. 3 to FIG. 6 in combination with the description of the embodiments, and further details of the technical implementation of the embodiments of the present invention are given. As shown in FIG. 3, the embodiment of the present invention provides a method for transmitting information by a transmission device, including: Step S301: A transmission device sets a self-identification information to be advertised. The dual-issue can be identified; Step S302, the transmission device uses the shorter data packet transmitted in the current communication process, and fills the self-identification information in the padding byte of the shorter data packet; wherein, the shorter data packet refers to not reaching The minimum required length of the standard defined frame is the packet. For example, the length of the shorter packet is less than the packet length of the frame in Figure 1 by 64 bytes. Step S303: The transmission device outputs a shorter data packet that fills its own identification information to the lower-level device. The self-identification information preferably includes physical location information of the transmission device. Of course, the information may be other information that the sender and the receiver can identify. The physical location information includes: a country code, a province code, a county code, a township code, a natural village code, The rack structure number, board slot number, and board port number are shown in Figure 4. In the embodiment of the present invention, the transmission device uses the short data packet currently being transmitted, and fills the self-identification information in the padding byte of the shorter data packet to implement the delivery of the self-identification information. It can be seen that the embodiment of the present invention utilizes the existing resources and uses the original meaningless padding bytes to transmit meaningful self-identification information, and the identity information is actively sent out to ensure the correct connection of the cable. Embodiment 2 The embodiment of the present invention provides a method for transmitting information by a transmission device. The implementation process of this embodiment is basically the same as that of Embodiment 1. The difference is that, in this embodiment, during the actual operation, there may be a network. In the embodiment of the present invention, the transmission device may also actively issue a short data packet, where the short data packet is less, and the transmission device needs to notify the receiving end of the information as soon as possible. Carry the identity information of the transmission device. As shown in FIG. 5, the specific implementation is as follows. Step S501: The transmission device sets its own identification information. Step S502: The transmission device fills its own identification information with a shorter data packet transmitted in the current communication process and a short data packet that is actively released. The length of the shorter data packet is smaller than the encapsulation length of the frame in the Ethernet; in step S503, the transmission device outputs the shorter data packet filled with the self identification information to the lower device. In this embodiment, the transmission device can determine whether it wants to actively issue a shorter data packet by detecting the number of shorter data packets transmitted in the communication, and the length, quantity, frequency, and the like of the transmitted shorter data packet. In the embodiment of the present invention, the short data packet and the short data packet that are actively advertised are transmitted to the rear device in a timely manner on the premise of minimizing resource consumption, thereby ensuring the correct connection of the cable. Embodiment 3 A method for transmitting information by a transmission device according to an embodiment of the present invention, as shown in FIG. 6, includes: Step S601: The transmission device sets its own identification information; wherein, the format of the self-identification information is to meet the dual-issue </ RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI></RTI> The transmission device outputs a shorter packet filling its own identification information to the subordinate device. In the embodiment of the present invention, the transmission device can actively transmit its own identification information to the lower-level device in time by proactively releasing the short data packet, thereby ensuring the correct connection of the cable. In the above embodiment, the transmission device may use a general ARP protocol data packet as a shorter data packet in the transmission process, and the transmission device may use the ARP feature, a free ARP (gratuitous ARP), as the active short packet. , it means that the host sends ARP to find its own IP address. Because, as shown in Figure 1, IEEE 802.2/802.3 (RFC 1042) and Ethernet encapsulation format (RFC 894), both frame formats use 48 bit (6 bytes) of destination address and source address (802.3 allows Use a 16-bit address, but typically a 48-bit address), which is the hardware address. The ARP and RARP protocols map 32-bit IP addresses and 48-bit hardware addresses. Since the data frame length of the ARP request or reply is 42 bytes (28 bytes of ARP data, 14 bytes of Ethernet frame header), each frame must be filled with padding characters to achieve the minimum length of Ethernet. : 60 bytes. In summary, the method for transmitting information by the transmission device provided by the embodiment of the present invention makes full use of the existing resources, uses the original meaningless padding bytes, and transmits the meaningful self information, and actively publishes the self information. Let the peer recognize its identity and ensure the correct connection of the cable. Moreover, in the local area network, the IP address is converted into the second layer physical address (ie, the MAC address) through the ARP protocol. The ARP protocol is of great significance to network security. ARP spoofing is achieved by forging IP addresses and MAC addresses, and a large amount of ARP traffic can be generated in the network to block the network. The present invention can also use the carried self-identification information to filter and limit the rate of ARP packets: if the self-identification information carried inconsistent with the previously stored information is inconsistent, it can be filtered out; The ARP packet rate is a reasonable value. It can be seen that the embodiment of the present invention can also prevent an ARP attack. As shown in FIG. 7, the embodiment of the present invention further provides a transmission device, including: an information setting module, configured to set self-identification information to be advertised; a data packet filling module, configured to fill the self-identification information in a short In the data packet, the length of the shorter data packet is smaller than the package length of the frame in the Ethernet; the data packet sending module is configured to output the shorter data packet to the lower device. The self-identification information set by the information setting module preferably includes physical location information of the transmission device, and of course, other information that the transmitting and receiving parties can recognize. Further, the shorter data packet is a shorter data packet transmitted during the current communication process of the transmission device, and/or a shorter data packet actively issued by the transmission device. Moreover, when the shorter data packet is a shorter data packet transmitted during the current communication process of the transmission device, the data packet filling module fills the own identification information in the padding byte of the shorter data packet. The short data packet transmitted by the transmission device in the current communication process is an address resolution protocol ARP protocol data packet; the short data packet actively issued by the transmission device is a free ARP protocol data packet. The technical details of the device according to the embodiment of the present invention are further given by a specific example. The application scenario of the embodiment of the present invention is as shown in FIG. 8 , and includes three parts: a network management system or a CLI (command line interface), which is responsible for human-computer interaction; and a network element control board, which is responsible for configuring the entire network element, including configuration of each board. Information; Service board, connected with optical fiber or network cable, responsible for receiving and transmitting data packets, and transmitting specific services. The process of actively publishing the identity information in the embodiment of the present invention is as follows: Step 1: Set the identity information to be advertised by using the network management or the command line. Step 2: The network management or the command line saves the set identity information on the network element control board. The above is sent to the service board; Step 3: The service board fills the padding byte in the shorter data packet to set the self-identification information, and actively transmits the self-identification information along with the transmission of the shorter data packet. For example, the physical location information is as follows: the physical location information includes: a country code, a province code, a county code, a township code, a natural village code, a rack subrack number, a board slot number, and a board port number. In the specific implementation, the physical location information can be set as the self-identification information to be advertised through the network management and the command line. For the country code, the province code, the county code, the township code, the natural village code, the rack subrack number, etc., the network management or You can add the physical location information to the shorter packets by adding the physical slot information to the board. Further, in the preferred embodiment of the present invention, the network management or the command line may be used to actively issue a short data packet, that is, the length of the data packet is set through the network management or the command line interface, and the number of times the data packet is sent and the number of times the data packet is sent may also be sent. The frequency or period is sent to the service board through the NE control board. The service board transmits the self-identification information set by the network management system or the command line to the lower-level device through the unpublished short data packet. It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

Claim

A method for transmitting information by a transmission device, comprising:

The transmission device sets the self-identification information to be released;

The transmission device fills the self-identification information in a shorter data packet, where the length of the shorter data packet is smaller than the encapsulation length of the frame in the Ethernet;

The transmitting device outputs the shorter data packet to a lower device.

2. The method of claim 1 wherein

The shorter data packet is a shorter data packet transmitted during the current communication process of the transmission device, and/or a shorter data packet actively issued for the transmission device.

3. The method according to claim 2, wherein, when the shorter data packet is a shorter data packet transmitted during a current communication process of the transmission device, the transmission device fills the self identification information in the shorter The padding bytes of the packet.

4. The method according to claim 2, wherein the short data packet transmitted by the transmission device in the current communication process is an address resolution protocol ARP protocol data packet; the short data packet actively released by the transmission device is a free ARP. Protocol packet.

The method according to claim 1 or 2 or 3 or 4, wherein the self identification information comprises physical location information of the transmission device.

6. A transmission device comprising:

An information setting module, configured to set self-identification information to be released;

a packet filling module, configured to fill the self-identification information in a shorter data packet, where a length of the shorter data packet is smaller than a packet length of an Ethernet medium frame;

The data packet is sent by the module, and is configured to output the shorter data packet to the lower device.

7. The transmission device according to claim 6, wherein the shorter data packet in the data packet filling module is a shorter data packet transmitted during a current communication process of the transmission device, and/or a shorter time actively issued by the transmission device. data pack. The transmission device according to claim 7, wherein, when the shorter data packet is a shorter data packet transmitted during a current communication process of the transmission device, the data packet filling module is configured to fill the self identification information In the padding byte of the shorter packet. The transmission device according to claim 7, wherein the short data packet transmitted by the transmission device in the current communication process is an address resolution protocol ARP protocol data packet; and the short data packet actively released by the transmission device is a free ARP protocol. data pack. The transmission device according to claim 6 or 7 or 8 or 9, wherein the self-identification information set by the information setting module includes physical location information of the transmission device.