CN1368814A - Method for configuring network by overlapping ATM with Internet protocols - Google Patents

Abstract

The invention relates to a method of superposablly setting up network by ATM and IP, with a unified exchange network to realize the exchange of ATM and high speed IP routing simultaneously and mutual communication exchange board. Said unified exchange network employs the scheme of "one set two flats" containing setting up ATM flat, a high speed platform, a unified core exchange platform, a function module mutual communicating information by ATM and IP, two modules controlling the service platforms of ATM and high-speed IP and a module of MPLS unifiedly controlling the service of ATM/IP.

Description

The method of a kind of asynchronous transfer mode and IP Internet Protocol configuring network by overlapping

The present invention relates to the switching technology field, relate to the method for a kind of ATM(Asynchronous Transfer Mode) and IP Internet Protocol (IP) configuring network by overlapping or rather, be a kind of when being used to solve the overlapping networking of ATM(Asynchronous Transfer Mode) and IP Internet Protocol (IP), be applied to a kind of Dual Plane Switch Route technical scheme in the wide band multi-business switch.

Along with data service rapidly and vigorous growth, network increases day by day to the demand of bandwidth, network broadbandization is just becoming the trend of network development.Solve network broadbandization and mainly comprise two types scheme, be i.e. ATM(Asynchronous Transfer Mode) technology and IP Internet Protocol (IP) technology.

IP Internet Protocol (IP) technology, hereinafter to be referred as the IP network technology, manufacturer is advocated by conventional data communications, its advantage is that routing architecture is flexible, owing to adopt non-connection-oriented method of service of doing one's best, thereby be suitable for doing the non real-time transmission of Information, but the traditional IP technology can't guarantee service quality (QoS) requirement to time delay, bandwidth etc., also just can not satisfy the transmission requirement of real time information such as voice, video.

The ATM(Asynchronous Transfer Mode) technology, manufacturer is advocated by conventional telecommunications, adopt connection-oriented transmission technology, again can support voice, data and Image Communication, and packet switching and Circuit-switched advantage are comprehensively arranged, thereby have favorable service quality (QoS) assurance, its shortcoming is: the signaling that connects is too complicated, the route flexibility is not high, when transmitting short general data, the efficient that then seems is not high.

Flourish along with data service, the service traffics of network constantly increase, analyze existing network service traffic, the network service traffic in the metropolitan area network particularly, exist on the one hand and a large amount of do not require the business that strict service quality (QoS) guarantees as 3W, FTP, E-mail etc., they are to realize by traditional IP technology; Exist a large amount of, VOIPs (Voice of Internet Protocol) interconnected as the enterprise network special line etc. on the other hand again simultaneously and need the business that strict service quality (QoS) guarantees, they are to realize by the mode by ATM carrying IP.

The Network that ATM and IP are respectively different service quality (QoS) requirement provides the most effective solution, and a broadband network then must satisfy the demand of two class business simultaneously: interconnected and real-time video traffic and the Internet business of networking lower to quality of service requirement to the higher enterprise of quality of service requirement.In order to support two class quality (QoS) to require different business simultaneously, traditional solution has three kinds: the overlaying scheme that comprises pure ATM solution, pure IP solution and ATM+IP.

Referring to Fig. 1, the business realizing of ATM switch shown in figure principle is a kind of pure ATM solution.ATM multi-service net as domestic many cities selection utilizes ATM backbone switch and edge switch to build adopts multiple IPOA (IP OVER ATM) technology, as coming bearer IP service with agreements such as IPOA, 1483B, LANE, MPOA.

ATM switch comprises incoming line interface unit 11, inner exchanging unit 12, outlet line interface unit 13 and ATM control unit 14.

Wherein incoming line interface unit 11 comprises physical layer (PHY) 111, the processing 112 of ATM layer and ATM queue management 113, and physical layer (PHY) 111 extracts ATM cell (the IP bag being carried on the ATM cell in the access part) from physical link; The ATM layer is handled 112 vpi/vci values that extract in the header from ATM cell, correspondence generates inner cell format (as adding inner cell encapsulation header Tag etc.) and carries out the atm traffic monitoring after inquiry continues routing table; ATM queue management 113 is carried out each Virtual Channel (per VC) queuing and is dispatched by class of service under the control of ATM control unit 14.

Outlet line interface unit 13 comprises ATM queue management 131, the processing 132 of ATM layer and physical layer (PHY) 133, and output work queue is carried out in ATM queue management 131 under the control of ATM control unit 14; The ATM layer is handled 132 and is removed inner cell encapsulation header (Tag) and carry out the header switching; Physical layer (PHY) 133 sends to cell on the physical link.

The form of ATM switch input ATM cell is header (comprising VPI/VCI)+cell payload (48 a byte fixed-length data); The form of ATM switch inner exchanging fixed length grouping is inner routing tag Tag+ header+cell payload; The form of ATM switch output ATM cell is header+cell payload.

This pure atm technology in ATM cell, can provide the IP data encapsulation towards the high-quality multimedia application and the business user's interconnect services that connect, bandwidth is controlled, safe, time delay is little for IP.Its advantage is to have strict service quality guarantee, can carry out multiple service supporting and technology maturation; Its shortcoming be for a large amount of WWW browse, Internet (Internet) businesss of networking such as FTP, E-MAIL use, exist when having agreement complexity (two cover agreements), carrying IP cell tax, efficiency of transmission low, can not realize the routing forwarding that distributes.This simple " ATM+IP " mode can not satisfy the demand that simple in a large number, cheap Internet business is provided for broadband network.

It is to be noted, though POS (Package Over SDH) and GE interfaces such as (gigabit Ethernets) can be provided on some ATM switch, but because the POS/GE interface on the ATM switch adopts the mode of IPOA (IP OVERATM) to be linked on the atm switching core, there are agreement complexity, shortcoming that expense is big equally, can not realize the routing forwarding that distributes.Therefore even on ATM switch, all plug IP operation interface boards such as POS, compare with real gigabit switch router GSR (Gigabyte Switch Router), remain different in essence.

Referring to Fig. 2, the business realizing of high speed router shown in figure principle is a kind of scheme of utilizing the high speed switch router to build metropolitan area network.Employing is the gigabit switch router (GSR) of core with the IP technology, networks by POS (Package OVER SDH) or Gigabit Ethernet mode, and the ATM layer in the middle of saving directly carries IP.

With the IP technology is that the gigabit switch router (GSR) of core comprises input unit 21, inner exchanging unit 22, output unit 23 and IP control unit 24.

Wherein input unit 21 comprises physical layer (PHY) 211, the processing 212 of IP layer and IP queue management 213, and physical layer (PHY) 211 is extracted the IP bag by the POS/GE interface from physical link; The IP layer is handled 212 pairs of IP bags and is carried out RED, WFQ, CBQ processing such as (representing the traffic monitoring strategy respectively) and IP is cut (branch) sheet becoming the fixed-length data bag, the control of surfing the Net; IP queue management 213 is extracted purpose IP address in the IP head, is looked into routing table under the control of IP control unit 24, IP stream is classified and the IP flow is monitored.

Output unit 23 comprises that IP queue management 231, IP layer handle 2 32 and physical layer (PHY) 233, IP queue management 231 under the control of IP control unit 24 to IP section recombinate IP bag and output work queue; The IP layer is handled 232 and is finished L3/L2 (layer of IP network and Ethernet is handled encapsulation) map addresses; Physical layer (PHY) 233 sends to the IP bag on the physical link by the POS/GE interface.

The form of high speed router input IP bag is IP head+random length IP payload data; The form of high speed router inner exchanging fixed length grouping is inner routing tag Tag+IP burst fixed-length data; The form of high speed router output IP bag is IP head+random length IP payload data.

The advantage that this mode is carried IP is tangible: IP efficiency of transmission height, agreement are simple, port speed is easily expanded, and its network is simple, and operating cost is low, can be based on the SDH net of huge and stable performance, and have certain service quality to guarantee ability.Its shortcoming is: flow control and Bandwidth Management ability, manageability and poor stability, be difficult to support business user's the interconnected and real-time multimedia business of enterprise, be difficult to guarantee the service quality of Speech Communication and video communication, thereby relatively be applicable to the Internet backbone network that transmits as possible.A lot of at present operations commercial city has recognized that the business bureau of high speed router (GSR) networking that employing is simple is sex-limited.

Some GSR equipment it is to be noted equally: though can provide atm interface, but the atm interface on the GSR equipment is the terminal side equipment on the atm network, before entering the GSR switching network, all Virtual Channels (VC) are terminated, needing that cell is reassembled into the IP bag transmits, therefore GSR can not realize the exchange of ATM VC, also just can not possess the distinctive perfect traffic engineering of ATM switch.Generally: the atm interface that provides by GSR can not provide real ATM to use.

A kind of technology that merely relies on by Figure 1 and Figure 2 is the business demand that is difficult to satisfy different user, different service quality.ATM and IP have advantage separately, carry IP with ATM, can obtain the high-quality service of controlled bandwidth, but have expense big, the shortcoming that agreement complexity, efficient are not high; Carry IP with GSR or gigabit Ethernet, have advantages such as transmission efficiency height, networking are simple, guarantee that bandwidth is uncontrollable, can not satisfy business user's high quality-of-service demand but lost strict IP QOS.This shows that this unity of contradictions must rely on remedying mutually of these two kinds of technology and realize.

Referring to Fig. 3, adopt IP+ATM stack networking mode shown in the figure, promptly utilize the scheme of ATM switch and the overlapping networking of high speed switch router.Build the mode of a pure IP network by adopting when building an ATM multi-service net, to superpose again, realize broadband network with the demand that satisfies high-quality enterprise interconnect services and low-quality Internet business of networking simultaneously.

At the main two class business that exist in the network, one class is higher enterprise's interconnect services and a real-time video traffic of quality of service requirement, an other class is the lower the Internet business of networking of quality of service requirement, and produce two kinds of networks that satisfy this two classes business demand respectively, promptly when building an ATM(Asynchronous Transfer Mode) multi-service net, superpose again and build a pure world interconnected (IP) network, come to satisfy respectively and simultaneously that high-quality enterprise is interconnected, real-time video traffic and low-quality Internet service demand.

As shown in FIG., the user 311,312 in the user network is when carrying out higher enterprise's interconnect services of quality of service requirement and real-time video traffic, and the ATM switch 331 that connects backbone layer by access layer equipment 321,322 enters ATM local network 33; User 313,314 in the user network connects backbone layers by Access Layer routing device 323,324 when carrying out the lower the Internet business of networking of quality of service requirement high speed router 341 enters IP local network 34, and the information interaction of 341 of ATM switch 331 in the ATM local network 33 and the high speed routers in the IP local network 34 then has the intercommunication bottleneck point up to now.

Adopting the most tangible advantage of the overlapping networking mode of ATM+IP is fully to satisfy the business demand of different user, and the business that can be the different service quality requirement provides the most effective solution.Utilizing the ATM switching technology to provide needs the business of service quality assurance, utilizes the high speed router technology that traditional IP operation is provided.By the combination of ATM and IP, the business that requires to different service quality provides service efficiently, has made full use of the advantage of ATM exchange and IP route.

But it also is fairly obvious adopting the shortcoming of the overlapping networking mode of ATM+IP: overlapping networking need provide two to overlap independently network management system, makes the network management process complicated; It is big to build two cover network system investments, has increased operator's investment construction cost and risk; Intercommunication between two network services promptly also has bandwidth bottleneck at the connected node place.

The objective of the invention is: the method that designs a kind of asynchronous transfer mode and IP Internet Protocol configuring network by overlapping for the drawback that solves the overlapping networking of ATM+IP, in a wide band multi-business switch device, by adopting " Dual Plane Switch Route " technology of original creation, success solves the shortcoming of the overlapping networking of ATM+IP, simplify network management simultaneously, reduce the networking cost, solve the bottleneck of two network service intercommunications, for the operator provide simply, reliably, two business solutions of unit cheaply.

The technical scheme that realizes the object of the invention is such: the method for a kind of asynchronous transfer mode and IP Internet Protocol configuring network by overlapping, it is characterized in that: be in same wide band multi-business switch, with a unified switching network, realize ATM(Asynchronous Transfer Mode) exchange and (IP) route switching of high speed IP Internet Protocol simultaneously and carry out professional and IP Internet Protocol (IP) service intercommunication of ATM(Asynchronous Transfer Mode).

A described unified switching network, comprise an ATM(Asynchronous Transfer Mode) service plane is set, a high speed IP Internet Protocol (IP) service plane, a unified core switching plane, an IWF module of ATM(Asynchronous Transfer Mode) business and high speed IP Internet Protocol (IP) business being carried out information mutual communication, control module that the ATM(Asynchronous Transfer Mode) service plane is controlled and the control module that high speed IP Internet Protocol (IP) service plane is controlled respectively, and the multi-protocols that ATM(Asynchronous Transfer Mode)/IP Internet Protocol (IP) business is unified to control are signed exchange (MPLS) control module.

The described ATM(Asynchronous Transfer Mode) that realizes simultaneously exchanges and high speed IP Internet Protocol (IP) route switching, further comprise: receive the ATM(Asynchronous Transfer Mode) cell from physical port by described wide band multi-business switch, handle and sign under the control of exchange (MPLS) control module through described ATM(Asynchronous Transfer Mode) service plane in ATM(Asynchronous Transfer Mode) control module or multi-protocols, be sent to the core switching plane through behind the queue scheduling, exchange to corresponding ATM(Asynchronous Transfer Mode) port by the core switching plane, realize the ATM(Asynchronous Transfer Mode) switch function; Receive IP Internet Protocol (IP) bag by described wide band multi-business switch from physical port, handle and sign under the control of exchange (MPLS) control module through described high speed IP Internet Protocol (IP) service plane in high speed IP Internet Protocol (IP) control module or multi-protocols, be sent to described core switching plane through behind the queue scheduling, exchange to corresponding IP Internet Protocol (IP) output port by described core switching plane, realize IP Internet Protocol (IP) routing function.

Described realization ATM(Asynchronous Transfer Mode) switch function further comprises: receive the ATM(Asynchronous Transfer Mode) cell from the ATM(Asynchronous Transfer Mode) physical layer; The ATM(Asynchronous Transfer Mode) cell that receives is made the ATM(Asynchronous Transfer Mode) layer to be handled; Delivering to described core switching plane after formation manages and dispatches to ATM(Asynchronous Transfer Mode) exchanges; Deliver to corresponding ATM(Asynchronous Transfer Mode) output port by described core switching plane exchange; Delivering to the ATM(Asynchronous Transfer Mode) layer after formation manages and dispatches to ATM(Asynchronous Transfer Mode) handles; With, from physical port output ATM(Asynchronous Transfer Mode) cell.

Described realization IP Internet Protocol (IP) routing function further comprises: IP Internet Protocol (IP) bag that receives is made IP Internet Protocol (IP) layer handle; Delivering to described core switching plane after IP Internet Protocol (IP) queue management and scheduling exchanges; Exchange to corresponding IP Internet Protocol (IP) output port by described core switching plane; Delivering to IP Internet Protocol (IP) layer after IP Internet Protocol (IP) queue management and scheduling handles; With, from physical port output IP Internet Protocol (IP) bag.

Described core switching plane is to adopt unified fixed-length data bag to exchange ATM(Asynchronous Transfer Mode) is professional with IP Internet Protocol (IP) is professional; Adorn and unified queue management and scheduling with unified the sealing of employing.

The form of described unified fixed-length data bag comprises the form of the professional fixed-length data bag of ATM(Asynchronous Transfer Mode) and the form of the professional fixed-length data bag of IP Internet Protocol (IP); The form of the professional fixed-length data bag of ATM(Asynchronous Transfer Mode) is the ATM(Asynchronous Transfer Mode) header of internal data packet header+53 bytes of K byte and the extension bit of ATM(Asynchronous Transfer Mode) payload+M byte; The form of the professional fixed-length data bag of IP Internet Protocol (IP) is the extension bit of IP Internet Protocol (IP) packet voice+L byte of the internal data packet header+N byte of K byte.

Described K, M, N, L are the positive integer less than 53, and the length of unified fixed-length data bag is K+53+M=68 byte and K+N+L=68 byte.

Described professional and IP Internet Protocol (IP) service intercommunication of ATM(Asynchronous Transfer Mode) of carrying out, comprise by the ATM(Asynchronous Transfer Mode) business to IP Internet Protocol (IP) service intercommunication and professional to the ATM(Asynchronous Transfer Mode) service intercommunication by IP Internet Protocol (IP).

Described is that the data that the ATM(Asynchronous Transfer Mode) interface receives are exchanged to the IWF module through the unification of core switching plane by ATM(Asynchronous Transfer Mode) business to IP Internet Protocol (IP) service intercommunication, again by the IWF module forwards to target IP Internet Protocol (IP) port; Described professional by IP Internet Protocol (IP) is that the data that IP Internet Protocol (IP) interface receives are exchanged to the IWF module through the unification of core switching plane to the ATM(Asynchronous Transfer Mode) service intercommunication, again by the IWF module forwards to target ATM(Asynchronous Transfer Mode) port.

Described IWF module expands by ATM(Asynchronous Transfer Mode) and IP Internet Protocol (IP) intercommunication bandwidth requirement, can pile up each the IWF module that expands, and each IWF intermodule of expansion can carry out the intercommunication operation.

Describedly further comprise: receive the ATM(Asynchronous Transfer Mode) cell by described wide band multi-business switch from physical port, handle and be sent to described core switching plane through behind the unified queue scheduling through described ATM(Asynchronous Transfer Mode) service plane by ATM(Asynchronous Transfer Mode) business to IP Internet Protocol (IP) service intercommunication; Exchange to described IWF module by described core switching plane; In the IWF module, after ATM(Asynchronous Transfer Mode) queue management and layer processing, be assembled into IP Internet Protocol (IP) bag; Search routing table by described IWF module according to IP Internet Protocol (IP) the bag packet header after assembling, determine IP Internet Protocol (IP) output port of transmitting; After processing of IP Internet Protocol (IP) layer and queue management, be sent to described core switching plane again, and exchange to corresponding IP Internet Protocol (IP) output port.

Describedly further comprise to the ATM(Asynchronous Transfer Mode) service intercommunication: receive IP Internet Protocol (IP) bag by described wide band multi-business switch from physical port, handle, be sent to the core switching plane after through queuing and scheduling through described high speed IP Internet Protocol (IP) service plane by IP Internet Protocol (IP) is professional; Exchange to described IWF module by described core switching plane; In the IWF module, after IP Internet Protocol (IP) queue management and layer processing, search routing table according to IP Internet Protocol (IP) bag packet header, determine the ATM(Asynchronous Transfer Mode) output port of transmitting; After processing of ATM(Asynchronous Transfer Mode) layer and queue management, be sent to described core switching plane again, and exchange to corresponding ATM(Asynchronous Transfer Mode) output port.

The technical scheme that realizes the object of the invention can also be such: the method for a kind of asynchronous transfer mode and IP Internet Protocol configuring network by overlapping, it is characterized in that: be in same wide band multi-business switch, with a unified switching network, realize ATM(Asynchronous Transfer Mode) exchange and high speed IP Internet Protocol (IP) route switching simultaneously.

A described unified switching network, comprise the control module that an ATM(Asynchronous Transfer Mode) service plane, a high speed IP Internet Protocol (IP) service plane, unified core switching plane, the control module of respectively the ATM(Asynchronous Transfer Mode) service plane being controlled is set and high speed IP Internet Protocol (IP) service plane is controlled and the multi-protocols that ATM(Asynchronous Transfer Mode)/IP Internet Protocol (IP) business is unified to control are signed exchange (MPLS) control module.

The method of asynchronous transfer mode of the present invention and IP Internet Protocol configuring network by overlapping is under the main trend that takes into full account the current network fusion, the at first fusion of a kind of network equipment level of Shi Xianing; The method of asynchronous transfer mode of the present invention and IP Internet Protocol configuring network by overlapping, be in a wide band multi-business switch, by adopting unified switching network, realize ATM exchange and High Speed IP routing function simultaneously, with the intercommunication that ATM business and IP operation are provided in this wide band multi-business switch simultaneously, promptly described " Dual Plane Switch Route " technology.

Should be noted that: because present telecommunication market mainly depends on IP and two networks of ATM provide Internet business and broadband data service, the immense pressure of safeguarding two networks is being born by operator, multi-protocols are signed exchange (MPLS) makes people see the dawn of unified Operation Network platform, but because MPLS standard draft still so far, there is skimble-scamble problem in the MPLS intercommunication of each producer, this makes MPLS at service quality (QoS), VPN(Virtual Private Network), the advantage of aspects such as traffic engineering is difficult to bring into play, and present stage still adopts with MPLS network replacement atm network and IP network.Therefore, up to the present, realize that the fusion of whole net is also unrealistic, the fusion of whole net also can bring many risks on the contrary not only without any advantage.

The present invention be directed to the shortcoming of the overlapping networking pattern of present ATM+IP, under existing technological accumulation and inheritance, the at first fusion of the device level of two kinds of quality of service requirement business of Shi Xianing, treat the MPLS technology maturation after, just can progressively reach network level and merge.

Further specify technology of the present invention below in conjunction with embodiment and accompanying drawing.

Fig. 1 is the ATM switch business realizing theory diagram of pure ATM solution.

Fig. 2 utilizes the high speed switch router to build the high speed router business realizing theory diagram of metropolitan area network.

Fig. 3 is the realization block diagram that utilizes ATM switch and the overlapping networking scheme of high speed router.

Fig. 4 is the two service plane know-why block diagrams of unit of the present invention.

Fig. 5 is the professional fixed-length data packet format of the ATM/IP schematic diagram that the present invention adopts.

Address before the explanation of Fig. 1 to Fig. 3, repeat no more.

Referring to Fig. 4, the two service plane technology of Radium 8750 units that adopt method of the present invention to implement shown in the figure, comprise: an ATM(Asynchronous Transfer Mode) service plane 41 is set, a high speed IP Internet Protocol (IP) service plane 42, a unified core switching plane 43, an IWF module 44 of ATM(Asynchronous Transfer Mode) business and high speed IP Internet Protocol (IP) business being carried out information mutual communication, control module 451 that the ATM(Asynchronous Transfer Mode) service plane is controlled and the control module 452 that high speed IP Internet Protocol (IP) service plane is controlled and the multi-protocols that ATM(Asynchronous Transfer Mode)/IP Internet Protocol (IP) business is unified to control are signed exchange (MPLS) control module 45 respectively.

ATM(Asynchronous Transfer Mode) service plane 41 wherein has the realization principle identical with ATM switch shown in Figure 1.Its incoming line interface unit comprises that physical layer (PHY) 411, ATM layer handle 412 and ATM queue management 413, and physical layer (PHY) 411 is extracted ATM cell from physical link; The ATM layer is handled 412 vpi/vci values that extract in the header from ATM cell, correspondence generates inner cell format (as adding inner cell encapsulation header Tag etc.) and carries out the atm traffic monitoring after inquiry continues routing table; ATM queue management 413 is carried out each Virtual Channel (per VC) queuing and is dispatched by class of service.Its outlet line interface unit comprises ATM queue management 414, the processing 415 of ATM layer and physical layer (PHY) 416, and output work queue is carried out in ATM queue management 414; The ATM layer is handled 415 and is removed inner cell encapsulation header (Tag) and carry out the header switching; Physical layer (PHY) 416 sends to ATM cell on the physical link.

Can control and manage by ATM control module 452 ATM(Asynchronous Transfer Mode) service plane 41, support multi-protocols to sign exchange (MPLS) simultaneously, for network provides the basis to unified MPLS network transition.

High speed IP Internet Protocol (IP) service plane 42 wherein has the realization principle identical with high speed routing service shown in Figure 2.Input unit wherein comprises physical layer (PHY) 421, the processing 422 of IP layer and IP queue management 423.Physical layer (PHY) 421 is extracted the IP bag by the POS/GE interface from physical link; The IP layer is handled 422 pairs of IP bags and is carried out RED, WFQ, CBQ processing such as (representing the traffic monitoring strategy respectively) and IP is cut (branch) sheet being processed into the fixed-length data bag, the control of surfing the Net; IP queue management 423 is extracted purpose IP address in the IP head, is looked into routing table, and IP stream is classified and the IP flow is monitored.Output unit wherein comprises that IP queue management 424, IP layer handle 425 and physical layer (PHY) 426,424 pairs of IP fragmentations of IP queue management recombinate IP bag and output work queue; The IP layer is handled 425 and is finished L3/L2 (layer of IP network and Ethernet is handled encapsulation) map addresses; Physical layer (PHY) 426 sends to the IP bag on the physical link by the POS/GE interface.

Can control and manage by IP control module 451 high speed IP Internet Protocol (IP) service plane 42, support multi-protocols to sign exchange (MPLS) simultaneously, for network provides the basis to unified MPLS network transition.

Unified core switching plane 43 mainly shows for ATM is professional and all adopts unified fixed-length data bag to exchange with IP operation; All adopt unified sealing to adorn and unified queue management and scheduling for ATM business datum cell and IP operation packet.

IWF module (RFM) 44 includes the ATM queue management 441 of processing ATM business and handles 442 with the ATM layer, the IP/ATM IWF module 445 of the IP queue management 443 of process IP business and IP layer processing 444 and realization IWF.

When realizing the ATM Service Switching Function: switch receives ATM cell from physical port 411, through ATM layer processing 412, ATM queue management 413, after scheduling, be sent to unified core switching plane 43, be sent to corresponding atm port (through ATM queue management 414, the processing 415 of ATM layer and physical layer 416) after the exchange.The form of input ATM cell is the ATM cell of standard: header (comprising VP/VCI)+48 byte fixed-length data; The form of inner exchanging fixed length grouping is internal head sign (as Tag etc.)+ATM cell; The output atm cell format is header (comprising VPI '/VCI ')+48 a byte fixed-length data.

When realizing the IP operation routing function: switch receives the IP data packet traffic from physical layer 421, carry out burst and handle and be cut into the packet (422) of fixed length, be sent to IP queue management (423), after scheduling, be sent to unified core switching plane 43, deliver to corresponding IP port (through IP queue management 424, the processing 425 of IP layer and physical layer 426) after the exchange.The form of input IP bag is IP head+random length IP payload; The form of inner exchanging fixed length grouping is internal head sign (as Tag etc.)+IP fragmentation; Output IP packet format is IP head+random length IP payload.

When realizing the ATM business: the data that receive from atm interface to the intercommunication of IP operation, through physical layer 411, the processing 412 of ATM layer and ATM queue management 413, through being sent to unified core switching plane 43 after the scheduling, after 43 exchanges of core switching plane, be sent to IWF module 44; Make output work queue and ATM layer through ATM queue management 441 and handle 442 and be assembled into the IP packet, the IP data packet head of IP/ATM IWF module 445 after according to assembling searched routing table, determines the output port of transmitting; Carry out map addresses, reorganization IP bag and output work queue through processing 425 of IP layer and IP queue management 424 again, be sent to unified core switching plane 43, promptly after IWF module (RFM) is transmitted, be forwarded to corresponding Target IP port (through IP queue management 423, the processing 422 of IP layer and physical layer 421).The form of input ATM cell is header (comprising VP/VCI)+48 a byte fixed-length data; The form of inner exchanging fixed length grouping is inner mark head (as Tag etc.)+ATM cell; Output IP packet format is IP head+random length IP payload.

When realizing IP operation: from the data of IP interface reception to the ATM service intercommunication, through physical layer 421, the processing 422 of IP layer and IP queue management 423, through being sent to unified core switching plane 43 after the scheduling, after 43 exchanges of core switching plane, be sent to IWF module 44; Handle 444 do reorganization IP bags, output work queue and map addresses through IP queue management 443 and IP layer, IP/ATM IWF module 445 is searched routing table according to the IP data packet head after assembling, and determines the ATM connectivity port of transmitting; Remove inner cell encapsulation header, header switching and output work queue through processing 442 of ATM layer and ATM queue management 441 again, be sent to unified core switching plane 43, promptly after IWF module (RFM) is transmitted, be forwarded to corresponding target atm port (through ATM queue management 413, ATM layer handle 412 and physical layer 411), IP sealed be contained in the ATM cell.The form of input IP bag is IP head+random length IP payload; The form of inner exchanging fixed length grouping is internal head sign (as Tag etc.)+fixed-length data bag (IP fragmentation); The output atm cell format is ATM cell head (comprising VPI '/VCI ')+48 a byte fixed-length data.

Putting it briefly, realize IP operation and ATM service intercommunication, is that the data that receive from atm interface are sent to IWF module 44 after 43 exchanges of core switching plane, is forwarded to corresponding IP target port after transmitting through IWF module 44; The data that receive from the IP interface are sent to IWF module 44 after 43 exchanges of core switching plane, are forwarded to corresponding ATM target port after transmitting through IWF module 44.

Therefore in switch, need the intercommunication of and IP operation professional through inner IWF module (RFM) 44 realization ATM.

Unified core switching plane mainly shows for ATM and IP operation and all adopts unified fixed-length data bag to exchange, as in the Radium of embodiment 8750 equipment, and fixed-length data Bao Changwei 68 bytes (Byte).The professional fixed-length data packet format of this ATM/IP as shown in Figure 5.

IWF module (RFM) can expand according to the intercommunication bandwidth, and each RFM can pile up, can intercommunication between each RFM.IWF module (RFM) is mainly finished three layers of forwarding capability, all safeguards a dynamic routing table on each RFM.RFM mainly finishes: between ATM Interface Unit, adopt IP carrying ATM (IP OVERATM) mode to finish route and the forwarding of IP; Between ATM Interface Unit and IP operation interface board, finish route and the forwarding of IP.

The present invention is provided with two planes simultaneously in a switch: ATM plane and IP plane.Realize the distributed surface speed forwarding of IP route by the IP operation interface boards such as POS/GE that are carried on the IP plane.Its forward mode, forward efficiency, Routing Protocol and route backup mechanism are just the same with GSR equipment, can satisfy the professional requirement that transmits as possible of a large amount of Internet, simultaneously, its traffic classification, queuing, buffer memory, scheduling mechanism can satisfy certain IP service quality assurance again.And the IP operation that is carried on the ATM plane can be enjoyed luxury service, service quality such as the accurate perfect flow control that provides by ATM, congested control, time delay assurance guarantee mechanism, provide distinctive differentiated services to the business user, have standard A TM repertoire that switch has.

The present invention does not need to be equipped with IWF module (RFM) under the applicable cases of pure ATM plane or the exchange of pure IP plane, can improve the economy of equipment.Only realize just the RFM module need being set under the situation of IP routing forwarding on ATM plane and intercommunication of IP plane and employing IP OVERATM etc., can realize the IP linear speed transmission between any port because but the powerful forwarding performance of RFM and stack properties guarantee no matter entire equipment carries IP on that plane.

Referring to Fig. 5, for unified core switching plane 43, ATM cell and IP packet adopt unified inner exchanging fixed length grouping in switching network: the internal data packet header Tag+ATM cell/IP data fragmentation of K byte; ATM cell wherein is made up of the extension bit that the ATM cell head of 53 bytes adds ATM payload and M byte; IP data fragmentation wherein is made up of the extension bit that the IP packet voice of N byte adds the L byte.K, M, N, L are the positive integer less than 53, and K+53+M=68, K+N+L=68.

Among the present invention, make the length of internal data bag of the professional and IP operation of ATM consistent, as all being 68 BYTE.In technology of the present invention, the burst of IP packet is different from traditional IPOA (IP OVER ATM) mode.Traditional way is that IP is sealed in the payload that is contained in ATM cell.And " Dual Plane Switch Route " of the present invention technology then directly seals IP and is contained in the internal data bag, and can overcome the shortcoming of Traditional IP OA mode poor efficiency, greatly improves the forwarding rate of packet, makes all IP interfaces can both reach linear speed.

" Dual Plane Switch Route " technology that the present invention adopts can overcome the shortcoming of legacy network solution, both can efficiently handle the IP operation that transmits as possible, the business that the service quality of also can satisfying the demand guarantees.Switch with " Dual Plane Switch Route " art designs is set up the ATM+IP network, need not build atm network and IP network respectively, has simplified network configuration, has greatly lowered construction cost and investment risk.Aspect network management, overcome the shortcoming that Traditional IP+atm network need be managed respectively ATM plane and IP plane, only need manage to same equipment, simplified Network Management greatly.Aspect biplane intercommunication efficient, the overlapping networking pattern of traditional ATM+IP, two independently can only be port interconnected between the physics net by certain ATM or POS, have the bottleneck problem of IP transfer rate between two nets.But during the switch networking of " Dual Plane Switch Route " technology of employing, IP between two service planes transmits and finishes by device core heart switching plane, there is not the bottleneck problem between the port speed, just on any core node, this two nets seamless intercommunication of switch type has entirely solved the integration problem of ATM net and IP network in fact well.

Claims (15)

1. the method for asynchronous transfer mode and IP Internet Protocol configuring network by overlapping, it is characterized in that: be in same wide band multi-business switch, with a unified switching network, realize ATM(Asynchronous Transfer Mode) exchange and (IP) route switching of high speed IP Internet Protocol simultaneously and carry out professional and IP Internet Protocol (IP) service intercommunication of ATM(Asynchronous Transfer Mode).

2. the method for a kind of asynchronous transfer mode according to claim 1 and IP Internet Protocol configuring network by overlapping, it is characterized in that: a described unified switching network, comprise an ATM(Asynchronous Transfer Mode) service plane is set, a high speed IP Internet Protocol (IP) service plane, a unified core switching plane, an IWF module of ATM(Asynchronous Transfer Mode) business and high speed IP Internet Protocol (IP) business being carried out information mutual communication, control module that the ATM(Asynchronous Transfer Mode) service plane is controlled and the control module that high speed IP Internet Protocol (IP) service plane is controlled respectively, and the multi-protocols that ATM(Asynchronous Transfer Mode)/IP Internet Protocol (IP) business is unified to control are signed exchange (MPLS) control module.

3. the method for a kind of asynchronous transfer mode according to claim 1 and 2 and IP Internet Protocol configuring network by overlapping, it is characterized in that: the described ATM(Asynchronous Transfer Mode) that realizes simultaneously exchanges and high speed IP Internet Protocol (IP) route switching, further comprise: receive the ATM(Asynchronous Transfer Mode) cell from physical port by described wide band multi-business switch, handle and sign under the control of exchange (MPLS) control module through described ATM(Asynchronous Transfer Mode) service plane in ATM(Asynchronous Transfer Mode) control module or multi-protocols, be sent to the core switching plane through behind the queue scheduling, exchange to corresponding ATM(Asynchronous Transfer Mode) port by the core switching plane, realize the ATM(Asynchronous Transfer Mode) switch function; Receive IP Internet Protocol (IP) bag by described wide band multi-business switch from physical port, handle and sign under the control of exchange (MPLS) control module through described high speed IP Internet Protocol (IP) service plane in high speed IP Internet Protocol (IP) control module or multi-protocols, be sent to described core switching plane through behind the queue scheduling, exchange to corresponding IP Internet Protocol (IP) output port by described core switching plane, realize IP Internet Protocol (IP) routing function.

4. the method for a kind of asynchronous transfer mode according to claim 3 and IP Internet Protocol configuring network by overlapping is characterized in that described realization ATM(Asynchronous Transfer Mode) switch function further comprises: receive the ATM(Asynchronous Transfer Mode) cell from the ATM(Asynchronous Transfer Mode) physical layer; The ATM(Asynchronous Transfer Mode) cell that receives is made the ATM(Asynchronous Transfer Mode) layer to be handled; Delivering to described core switching plane after formation manages and dispatches to ATM(Asynchronous Transfer Mode) exchanges; Deliver to corresponding ATM(Asynchronous Transfer Mode) output port by described core switching plane exchange; Delivering to the ATM(Asynchronous Transfer Mode) layer after formation manages and dispatches to ATM(Asynchronous Transfer Mode) handles; With, from physical port output ATM(Asynchronous Transfer Mode) cell.

5. the method for a kind of asynchronous transfer mode according to claim 3 and IP Internet Protocol configuring network by overlapping is characterized in that described realization IP Internet Protocol (IP) routing function further comprises: IP Internet Protocol (IP) bag that receives is made IP Internet Protocol (IP) layer handle; Delivering to described core switching plane after IP Internet Protocol (IP) queue management and scheduling exchanges; Exchange to corresponding IP Internet Protocol (IP) output port by described core switching plane; Delivering to IP Internet Protocol (IP) layer after IP Internet Protocol (IP) queue management and scheduling handles; With, from physical port output IP Internet Protocol (IP) bag.

6. according to the method for claim 4 or 5 described a kind of asynchronous transfer modes and IP Internet Protocol configuring network by overlapping, it is characterized in that: described core switching plane is to adopt unified fixed-length data bag to exchange ATM(Asynchronous Transfer Mode) is professional with IP Internet Protocol (IP) is professional; Adorn and unified queue management and scheduling with unified the sealing of employing.

7. the method for a kind of asynchronous transfer mode according to claim 6 and IP Internet Protocol configuring network by overlapping is characterized in that: the form of described unified fixed-length data bag comprises the form of the professional fixed-length data bag of ATM(Asynchronous Transfer Mode) and the form of the professional fixed-length data bag of IP Internet Protocol (IP); The form of the professional fixed-length data bag of ATM(Asynchronous Transfer Mode) is the ATM(Asynchronous Transfer Mode) header of internal data packet header+53 bytes of K byte and the extension bit of ATM(Asynchronous Transfer Mode) payload+M byte; The form of the professional fixed-length data bag of IP Internet Protocol (IP) is the extension bit of IP Internet Protocol (IP) packet voice+L byte of the internal data packet header+N byte of K byte.

8. the method for a kind of asynchronous transfer mode according to claim 7 and IP Internet Protocol configuring network by overlapping, it is characterized in that: described K, M, N, L are the positive integer less than 53, and the length of unified fixed-length data bag is K+53+M=68 byte and K+N+L=68 byte.

9. the method for a kind of asynchronous transfer mode according to claim 1 and 2 and IP Internet Protocol configuring network by overlapping, it is characterized in that: described professional and IP Internet Protocol (IP) service intercommunication of ATM(Asynchronous Transfer Mode) of carrying out, comprise by the ATM(Asynchronous Transfer Mode) business to IP Internet Protocol (IP) service intercommunication and professional to the ATM(Asynchronous Transfer Mode) service intercommunication by IP Internet Protocol (IP).

10. the method for a kind of asynchronous transfer mode according to claim 9 and IP Internet Protocol configuring network by overlapping, it is characterized in that: described is that the data that the ATM(Asynchronous Transfer Mode) interface receives are exchanged to the IWF module through the unification of core switching plane by ATM(Asynchronous Transfer Mode) business to IP Internet Protocol (IP) service intercommunication, again by the IWF module forwards to target IP Internet Protocol (IP) port; Described professional by IP Internet Protocol (IP) is that the data that IP Internet Protocol (IP) interface receives are exchanged to the IWF module through the unification of core switching plane to the ATM(Asynchronous Transfer Mode) service intercommunication, again by the IWF module forwards to target ATM(Asynchronous Transfer Mode) port.

11. the method for a kind of asynchronous transfer mode according to claim 10 and IP Internet Protocol configuring network by overlapping, it is characterized in that: described IWF module, expand by ATM(Asynchronous Transfer Mode) and IP Internet Protocol (IP) intercommunication bandwidth requirement, can pile up each the IWF module that expands, each IWF intermodule of expansion can carry out the intercommunication operation.

12. the method for a kind of asynchronous transfer mode according to claim 9 and IP Internet Protocol configuring network by overlapping, it is characterized in that describedly further comprising: receive the ATM(Asynchronous Transfer Mode) cell by described wide band multi-business switch from physical port, handle and be sent to described core switching plane through behind the unified queue scheduling through described ATM(Asynchronous Transfer Mode) service plane by ATM(Asynchronous Transfer Mode) business to IP Internet Protocol (IP) service intercommunication; Exchange to described IWF module by described core switching plane; In the IWF module, after ATM(Asynchronous Transfer Mode) queue management and layer processing, be assembled into IP Internet Protocol (IP) bag; Search routing table by described IWF module according to IP Internet Protocol (IP) the bag packet header after assembling, determine IP Internet Protocol (IP) output port of transmitting; After processing of IP Internet Protocol (IP) layer and queue management, be sent to described core switching plane again, and exchange to corresponding IP Internet Protocol (IP) output port.

13. the method for a kind of asynchronous transfer mode according to claim 9 and IP Internet Protocol configuring network by overlapping, it is characterized in that describedly further comprising to the ATM(Asynchronous Transfer Mode) service intercommunication: receive IP Internet Protocol (IP) bag by described wide band multi-business switch from physical port, handle, be sent to the core switching plane after through queuing and scheduling through described high speed IP Internet Protocol (IP) service plane by IP Internet Protocol (IP) is professional; Exchange to described IWF module by described core switching plane; In the IWF module, after IP Internet Protocol (IP) queue management and layer processing, search routing table according to IP Internet Protocol (IP) bag packet header, determine the ATM(Asynchronous Transfer Mode) output port of transmitting; After processing of ATM(Asynchronous Transfer Mode) layer and queue management, be sent to described core switching plane again, and exchange to corresponding ATM(Asynchronous Transfer Mode) output port.

14. the method for asynchronous transfer mode and IP Internet Protocol configuring network by overlapping, it is characterized in that: be in same wide band multi-business switch, with a unified switching network, realize ATM(Asynchronous Transfer Mode) exchange and high speed IP Internet Protocol (IP) route switching simultaneously.

15. the method for a kind of asynchronous transfer mode according to claim 14 and IP Internet Protocol configuring network by overlapping, it is characterized in that: a described unified switching network, comprise an ATM(Asynchronous Transfer Mode) service plane is set, a high speed IP Internet Protocol (IP) service plane, a unified core switching plane, control module that the ATM(Asynchronous Transfer Mode) service plane is controlled and the control module that high speed IP Internet Protocol (IP) service plane is controlled and the multi-protocols that ATM(Asynchronous Transfer Mode)/IP Internet Protocol (IP) business is unified to control are signed exchange (MPLS) control module respectively.

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