CN1306770C - A method for bearing IP message protocol on ATM network supported by broadband access equipment - Google Patents
A method for bearing IP message protocol on ATM network supported by broadband access equipment Download PDFInfo
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- CN1306770C CN1306770C CNB031495931A CN03149593A CN1306770C CN 1306770 C CN1306770 C CN 1306770C CN B031495931 A CNB031495931 A CN B031495931A CN 03149593 A CN03149593 A CN 03149593A CN 1306770 C CN1306770 C CN 1306770C
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Abstract
The present invention discloses a method for bearing an IP message protocol on an ATM network supported by a broadband access device, which comprises the steps that a broadband access device arranges received messages and converts packed protocol types in the up direction from a user side to a network side, i.e. messages packed by an IPOA protocol are converted into messages packed by an Ethernet protocol, and then the messages are sent to an IP metropolitan area network. The broadband access device converts the packed protocol of received messages in the down direction from the network side to the user side, i.e. messages packed by the Ethernet protocol are converted into messages packed by the IPOA protocol, and then the messages are under the process of route enquiry to obtain relevant PVC information and finally are sent to the user side. The method solves the problem that additional final devices need adding when an ATM network is communicated with the IP metropolitan area network, simplifies network structure, lowers operating cost, and enhances the functions of multicast and cascade connection of the ATM network.
Description
Technical field
The present invention relates to protocol conversion technology, specifically, relate to a kind of broadband access equipment is supported atm network bearing IP packet agreement (IPOA) by protocol conversion method.
Background technology
Present most Digital Subscriber Line (DSL) technology, the DSL technology such as ADSL (Asymmetric Digital Subscriber Line) (ADSL), Very-high-speed Digital Subscriber Line (VDSL), G.shdsl that comprise are based on the ATM cell technology, user's message is through the user housing apparatus (CPE) of XDSL, all is that the form with ATM cell passes to DSLAM equipment by subscriber's line.
Existing broadband access equipment Digital Subscriber Line Access Multiplexer (DSLAM) is not done termination to ATM cell, after the processing through the ATM layer, go out from the up atm interface of DSLAM, pass through atm network then, to BAS (BAS Broadband Access Server) equipment or to router.The termination of ATM cell is handled on BAS equipment or router.
In the following description with user side to the forwarding of network side handle be defined as up; Network side is defined as descending to the forwarding processing of user side.
In present network, the IPOA agreement is applicable to the DSLAM equipment of atm network.By this agreement, DSLAM can be directly and the BAS equipment of atm interface join, also can in atm network, transmit, join with BAS equipment then.If existing network is an IP network, realize providing in the IP network IPOA to insert, then existing equipment can not directly be supported the access of IPOA agreement, need extra ATM termination equipment and carry out the IPOA termination, it is up to be converted to IP, has so both increased the investment of operator, makes network become complicated again.
Summary of the invention
The present invention seeks to provide a kind of scheme of in existing broadband access equipment DSLAM equipment, supporting IPOA, thereby realize atm network and the direct intercommunication of IP metropolitan area network.
The present invention includes two parts of up processing and downlink processing.On up direction, the transmission course of message from the user side to the network side comprises the steps:
A1. receive user's message from user side;
B1. according to receiving ATM cell header in the message, extract and make up the information in each ATM cell information field in the message, the message after should making up according to the IPOA protocol encapsulation then;
C1. the message by the IPOA protocol encapsulation among the step b1 is converted to the message that encapsulates by Ethernet protocol, and the message after will encapsulating sends to the IP metropolitan area network;
On down direction, the transmission course of message from the network side to the user side comprises the steps:
A2. receive the message that the IP metropolitan area network sends;
B2. the message that receives is carried out the conversion of routing inquiry and encapsulated type, will be converted to message by the message of Ethernet protocol encapsulation by the IPOA protocol encapsulation;
C2. according to the message of pressing the IPOA protocol encapsulation among the atm cell format splitting step b2, and the message after will splitting is dealt into user side.
Wherein, be converted to described in the step c1 by the Ethernet protocol encapsulated message and further comprise: delete the logic link control (LLC) in the IPOA protocol encapsulation message earlier and organize unique identification (OUI) field, again before the message of deletion LLC and OUI, order is added medium access control (MAC) address of consulting the gateway determined in advance as purpose medium access control (DMAC) address, and the MAC Address that is provided with as the broadband access equipment of source medium access control (SMAC) address.
Wherein, the routing inquiry described in the step b2 is meant according to the VLAN ID in the message (VLANID) and searches PVC information.
Wherein, the routing inquiry described in the step b2 is meant according to user's IP address in the message and searches PVC information.
The present invention is by termination IPOA agreement in existing DSLAM equipment, specifically, it is the message that in DSLAM, the message of IPOA protocol encapsulation is converted to the ethernet format encapsulation, realized that DSLAM equipment directly docks with IP network, do not need the additional networks equipment IPOA agreement that terminates, thereby reduce the networking cost, simplified network configuration; The utilization ethernet switch technology has increased exchange capacity, because Ethernet has powerful multicast and cascade function, thereby has overcome the defective that atm network is not supported multicast, realized the cascade complexity.
Description of drawings
Fig. 1 is the applied networking schematic diagram of the present invention;
Fig. 2 is the message format schematic diagram of IPOA agreement;
Fig. 3 is the message format schematic diagram of Ethernet protocol;
Fig. 4 be among the present invention user side to network side uplink service DSLAM equipment work flow chart;
Fig. 5 be among the present invention network side to user side downlink business DSLAM equipment work flow chart.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below the present invention is described in more detail with reference to accompanying drawing.
Fig. 1 is the applied networking diagram of the present invention.As shown in Figure 1, CPE is a user housing apparatus, and DSLAM is a Digital Subscriber Line Access Multiplexer, and BAS represents BAS Broadband Access Server.The present invention has realized that by in DSLAM equipment message being encapsulated according to Ethernet protocol DSLAM links to each other with the direct of IP metropolitan area network, also can insert BAS by metropolitan area network, and realization is communicated by letter with other atm devices.
Fig. 2 is the message format of IPOA agreement, and IPOA encapsulated message form comprises logic link control (LLC), organizes unique identification (OUI), ethernet type (Ether Type), IP message and Frame Check Sequence (FCS) as shown in Figure 2.Wherein, LLC takies 3 bytes, and value is 0xAA-AA-03, and OUI takies 3 bytes, and value is 0x00-00-00, and Ether Type takies 2 bytes, and value is 0x08-00, and the IP message of back is the longest can be 2
16-9 bytes, last FCS takies 4 bytes, preserves the CRC check value of message.
Fig. 3 is the message format schematic diagram of Ethernet protocol.The Ethernet protocol message comprises: the VLAN sign (VLAN Tag) of purpose medium access control (DMAC) address of 6 bytes, source medium access control (SMAC) address of 6 bytes, 4 bytes, the length/type of 2 bytes, the data of 46 to 1500 bytes and the FCS of 4 bytes.Wherein, the VLAN Tag of 4 bytes comprises the protocol identifier (TPID) of 2 bytes and the sign control information (TCI) of 2 bytes, the value of TPID is fixed as 0x8100, the sign control information is made up of the User Priority territory (Priority) of 3 bits, the VLAN ID number (VLAN ID) of 12 bits, the canonical format indicator (CFI) of 1 bit, and the FCS of 4 bytes preserves the Cyclic Redundancy Check value of message.
Broadband access equipment of the present invention is supported process such as Fig. 4 and shown in Figure 5 of IPOA agreement, is divided into to the processing of uplink service with to two kinds of the processing of downlink business.Wherein, Fig. 4 be among the present invention user side to network side uplink service DSLAM equipment work flow chart, Fig. 5 be among the present invention network side to user side downlink business DSLAM equipment work flow chart.
As shown in Figure 4, DSLAM may further comprise the steps the handling process of uplink service:
Step 401:DSLAM equipment receives message from user side, promptly receives user's message by cpe device, and this message transmits with the ATM cell form.
Step 402: message arrangement.Information according to header in the ATM cell that receives, extract, make up the information in 48 byte information fields of each ATM cell in the message, and encapsulate according to the IPOA agreement, message format after the encapsulation as shown in Figure 2, wherein, LLC is 0xAA-AA-03, and OUI is 0x00-00-00, and Ether Type is 0x08-00.
Step 403: judge whether message is legal.Message after step 402 encapsulation is carried out CRC check, and accounting message length,, illustrate that message does not make a mistake, and carry out step 405 in transmission course if crc value, message length value are all identical with crc value and length value in the message; If inequality, illustrate that message makes a mistake, and carry out step 404, dropping packets, process ends when transmission.
Step 405: judge whether message E-Packets.According to the information of header in the ATM cell of obtaining in the step 402, judge type of message.If internet igmpinternet (IGMP) message or Operation Administration and Maintenance (OAM) signaling or DHCP (DHCP) message then carry out steps 406, hand over CPU to handle, process ends, otherwise carry out step 407;
Step 407: message encapsulation.According to Ethernet protocol current will E-Packeting encapsulated.During encapsulation LLC in the IPOA message and OUI are removed, add purpose medium access control (DMAC) address, source medium access control (SMAC) address and VLAN Tag then in the front of message, and then recomputate Cyclic Redundancy Check, be added to message at last as Frame Check Sequence (FCS), so just finished the conversion of protocol type in other words of message encapsulated type.
Wherein, the target MAC (Media Access Control) address of message uses the MAC Address of the Ethernet switch (gateway) that obtains through consultation, and source MAC just uses the versatile MAC address that is provided with as the IPOA protocol conversion module.Because an IPOA protocol conversion module can provide a plurality of users' access, institute thinks that the IPOA protocol conversion module is provided with the versatile MAC address and also allows a plurality ofly, is each user a different MAC Address is set.
Step 408: send message.Message after DSLAM will encapsulate sends to the IP metropolitan area network.
As shown in Figure 5, DSLAM may further comprise the steps the handling process of downlink business:
Step 501:DSLAM equipment receives message from network side, and this message is that its message format as shown in Figure 3 according to the message of Ethernet protocol encapsulation.
Step 502: judge whether message is legal.The message that receives is carried out CRC check, and accounting message length,, illustrate that message does not make a mistake, and carry out step 504 in transmission course if crc value, message length value are all identical with crc value and length value in the message; If inequality, illustrate that message makes a mistake, and carry out step 503, dropping packets, process ends when transmission.
Step 504: judge whether message E-Packets.According to the content of preserving protocol type field in the IP message, judge type of message.If internet igmpinternet (IGMP) message or Operation Administration and Maintenance (OAM) cell or DHCP (DHCP) message then carry out steps 505, hand over CPU to handle, process ends, otherwise carry out step 506;
Step 506: routing inquiry.According to the VLAN id information in the message or according to the IP address information in the message, in the table of the recording user information of setting up in advance, search the permanent virtual that needs when transmitting and connect (PVC).This table is that the demand according to the user is set up in equipment in advance, and it has write down the corresponding relation of VLAN ID, IP address and virtual channel indications (VCI), Virtual Channel indications (VPI), PVC.
Step 507: message encapsulation.According to the IPOA agreement, DMAC, the SMAC and the VLAN Tag that receive message header are removed, add LLC and OUI, and then recomputate CRC, be added to message at last as Frame Check Sequence (FCS), so just finished the conversion of protocol type in other words of message encapsulated type.Wherein, LLC is 0xAA-AA-03, and OUI is 0x00-00-00, and Ether Type is 0x08-00.
Step 508: message splits.With the message cell that to be divided into 48 bytes be unit, the value of cell gained is cut apart in table look-up VCI, VPI information and the verification of obtaining according to step 506, generates the ATM cell head, will cut apart the back that cell is placed on the ATM cell head then, forms ATM cell.
Step 509: send message, ATM cell is sent to user port according to the PVC information that step 506 obtains by cpe device.
Claims (4)
1, a kind of broadband access equipment is supported the method for atm network bearing IP packet protocol IP OA, it is characterized in that this method comprises up processing and two processes of downlink processing:
On up direction, the transmission course of message from the user side to the network side comprises the steps:
A1. receive user's message from user side;
B1. according to receiving ATM cell header in the message, extract and make up the information in each ATM cell information field in the message, the message after should making up according to the IPOA protocol encapsulation then;
C1. the message by the IPOA protocol encapsulation among the step b1 is converted to the message that encapsulates by Ethernet protocol, and the message after will encapsulating sends to the IP metropolitan area network;
On down direction, the transmission course of message from the network side to the user side comprises the steps:
A2. receive the message that the IP metropolitan area network sends;
B2. the message that receives is carried out the conversion of routing inquiry and encapsulated type, will be converted to message by the message of Ethernet protocol encapsulation by the IPOA protocol encapsulation;
C2. according to the message of pressing the IPOA protocol encapsulation among the atm cell format splitting step b2, and the message after will splitting is dealt into user side.
2, method according to claim 1, it is characterized in that, be converted to described in the step c1 by the Ethernet protocol encapsulated message and further comprise: delete the logic link control LLC in the IPOA protocol encapsulation message earlier and organize unique identification OUI field, again before the message of deletion LLC and OUI, order is added the medium access control MAC Address of consulting the gateway determined in advance as purpose medium access control dmac address, and the MAC Address that is provided with as the broadband access equipment of medium access control SMAC address, source.
3, method according to claim 1 is characterized in that, the routing inquiry described in the step b2 is meant that searching permanent virtual according to the VLAN ID VLAN ID from network side to the user side message connects PVC information.
4, method according to claim 1 is characterized in that, the routing inquiry described in the step b2 is meant according to user's IP address from network side to the user side message searches PVC information.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031495931A CN1306770C (en) | 2003-07-17 | 2003-07-17 | A method for bearing IP message protocol on ATM network supported by broadband access equipment |
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| CNB031495931A CN1306770C (en) | 2003-07-17 | 2003-07-17 | A method for bearing IP message protocol on ATM network supported by broadband access equipment |
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| CN1571395A CN1571395A (en) | 2005-01-26 |
| CN1306770C true CN1306770C (en) | 2007-03-21 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100395977C (en) * | 2005-06-10 | 2008-06-18 | 华为技术有限公司 | Implementation method for automatically identifying packaging type of subscriber data |
| CN100414918C (en) * | 2005-07-20 | 2008-08-27 | 华为技术有限公司 | Method and device for transfer ATM service based on IP exchanger |
| CN1968191A (en) * | 2006-04-10 | 2007-05-23 | 华为技术有限公司 | Method for ATM message transmission based on IP network |
| CN101047631A (en) * | 2006-04-29 | 2007-10-03 | 华为技术有限公司 | Customer position information transmitting method, MAC address automatic allocating method, network creating method and system |
| CN101102261A (en) | 2006-07-03 | 2008-01-09 | 华为技术有限公司 | Method and device for Ethernet carrier asynchronization transmission mode |
| CN101072243B (en) * | 2007-05-30 | 2010-09-29 | 华为技术有限公司 | Report processing method and access device |
| CN101277477B (en) * | 2008-04-29 | 2012-04-04 | 华为技术有限公司 | Method, apparatus and system for equalizing flux |
| CN101807967B (en) * | 2009-02-13 | 2015-07-08 | 瑞昱半导体股份有限公司 | Remote control method for physical layer and relevant physical layer device thereof |
| CN101800777A (en) * | 2010-03-05 | 2010-08-11 | 胡钢 | Open network data acquisition method and device, and monitoring system based on device |
| CN102377635B (en) * | 2010-08-06 | 2014-01-01 | 北京乾唐视联网络科技有限公司 | Metropolitan area network communication method and communication system thereof |
| CN102195812B (en) * | 2011-04-21 | 2015-06-03 | 中兴通讯股份有限公司 | Service activating method and device |
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| WO2001024459A1 (en) * | 1999-09-27 | 2001-04-05 | Siemens Aktiengesellschaft | Method for transferring time-critical data by ip-protocol |
| KR20010056740A (en) * | 1999-12-16 | 2001-07-04 | 서평원 | Multiprotocol Supportable ADSL Router And Packet Send/Receive Method In That Router |
| US6389021B1 (en) * | 1998-08-18 | 2002-05-14 | Nec Corporation | Intercommunication apparatus and communication method using the intercommunication apparatus |
| CN1357213A (en) * | 1999-06-15 | 2002-07-03 | 西门子公司 | Method and device for transmitting data |
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2003
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6389021B1 (en) * | 1998-08-18 | 2002-05-14 | Nec Corporation | Intercommunication apparatus and communication method using the intercommunication apparatus |
| CN1357213A (en) * | 1999-06-15 | 2002-07-03 | 西门子公司 | Method and device for transmitting data |
| WO2001024459A1 (en) * | 1999-09-27 | 2001-04-05 | Siemens Aktiengesellschaft | Method for transferring time-critical data by ip-protocol |
| KR20010056740A (en) * | 1999-12-16 | 2001-07-04 | 서평원 | Multiprotocol Supportable ADSL Router And Packet Send/Receive Method In That Router |
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