CN1307421A

CN1307421A - Switching route system

Info

Publication number: CN1307421A
Application number: CN00104396A
Authority: CN
Inventors: 李圭皓; 康薰; 李荣豪
Original assignee: Electronics and Telecommunications Research Institute ETRI
Current assignee: Electronics and Telecommunications Research Institute ETRI
Priority date: 2000-02-02
Filing date: 2000-03-21
Publication date: 2001-08-08
Anticipated expiration: 2020-03-21
Also published as: CN1213576C; KR100319460B1; KR20010077397A

Abstract

A high performance switched router system based on a high speed ATM cell switch for effectively processing an ATM and Ethernet traffic is provided. The system includes: a ATM network connection unit, a Ethernet network connection units, a high speed ATM cell switch unit, a service third layer processing unit and processor unit. The ATM network connection unit, the Ethernet network connection units and the service third layer processing unit connects with each other via connection of a change port and the high speed ATM cell switch unit. The invention simultaneously offer a connection function to an Ethernet network and an ATM network to provide an effective system base with reasonable cost for large and moderate campus internet or company internet.

Description

Switching route system

The present invention relates to a kind of data communication networking system, particularly a kind of based on the high-speed atm cell switching, and can handle the high-performance switching route system of ATM and ethernet communication effectively.

Along with development of Communication Technique, the user has proposed diversified service request in quality and quantitative aspects.Not only require to provide the service of the continuous analog information as sound equipment and image, also require the services such as real-time reflection communication that the high-speed data communication as the file transfer are provided and have variable bit rate.Require has a kind of communication network can provide on a same link these fulminant services for this reason.

The broadband comprehensive information communication network of ATM mode (Broadband ISDN) is exactly a kind of typical communication mode for realizing that this purpose produces.

Along with the service relevant with the internet and demand increase severely, require to realize economy and internet efficiently with some new technical approach.Two typical this internets are arranged here.One is based on ethernet technology in the past and the high speed set up data communication network (local area network (LAN)) closely; Another is in order to set up in the strong point that is suitable for the ATM mode on the internet, based on the high speed of atm technology data communication network closely.

For a kind of sign has appearred in the service level that improves the internet in the process of networking, that is exactly the communication network of Ethernet mode and the two coexistence mutually of the communication network of utilizing the ATM mode.This dual mode is in relation and each comfortable constantly development new technologies of striving unexpectedly mutually, develops the strong point of oneself, improves weakness, in the hope of seeking the high speed short-range communication net of a new generation.

In addition up to the present the data traffic in same LAN net much larger than the LAN net and the proportion between netting, but, along with the service relevant and the sharp increase of demand with the internet, make this situation that very big variation take place, promptly the LAN net has exceeded the proportion of communication in the net out and away with the proportion of communicating by letter between the net

This variation makes when setting up the communications infrastructure in order to form a so-called bottleneck in the process that connects the router feature between LAN net and the net.The bottleneck of this router has become a kind of obstacle, is difficult to make all LAN nets to be linked to be the communication network of a wide area, in the hope of improving the service level of internet.

In order to overcome the bottleneck of this router, developing a kind of relevant technology, Here it is a kind ofly can provide the switching route system that exchanges at a high speed routing function; Develop a kind of the 3rd layer function high speed processing method that is included in routing function simultaneously.

In high speed switching plane (Switching platform) in the past, ATM cell switching technology and Ethernet packet technology etc. are arranged as representational technology.Cell switching mode that it is generally acknowledged regular length can obtain the high speed switching performance.

The high speed processing method of the 3rd layer function had the method (Wirespeed) that the protocol processes function is realized with hardware and utilized MPOA (multi-protocol over atm standard) or the method for MPLS New Deals such as (label exchange multi-protocols standards) in the past.Former approach is that the raising with bandwidth is difficult to realize, and price is difficult to expectation for this reason and can continues developed also along with increasing; The latter then has the problem that all devices all must be comprised New Deal.

Generally, handle the employing former approach for the 3rd of ethernet communication the layer; The latter's method is then adopted in communication to ATM.In addition, generally in small-scale LAN net, adopt former approach and in extensive net, use the latter's method.Above-mentioned two kinds of situations mostly coexist in middle scale campus network or enterprises and institutions' net.In this case, can provide a kind of switching route system of high-performance routing function aspect special communication network, to play central role setting up high-quality.This system comprises the high-performance function of exchange that is exchanged for basic platform with ATM cell basically, and holds ATM communication and ethernet communication simultaneously, and provides high performance routing function to Ethernet and LAN emulation ATM communication.

Fig. 1 illustrates the structure chart of general exchange router system.Above-mentioned general exchange router system is by crosspoint (110), and networking linkage unit (120,130) comprises the Route Selection unit (140) and the control and management processor unit formations such as (150) of the 3rd layer function.

Above-mentioned crosspoint (110) and above-mentioned networking linkage unit (120,130) are to link to each other by switching port (160); Above-mentioned control and management processor unit (150) will remove to utilize above-mentioned switching port by the transceiver passage of system's control and management data; In addition, can also remove to utilize communication port (170) between the processor.Above-mentioned Route Selection unit (140) also can borrow above-mentioned switching port (160) by above-mentioned crosspoint (110) or utilize the communication port (170) between the above-mentioned processor to communicate with above-mentioned networking linkage unit (120,130).

Generally, as shown in Figure 1, exchange router system in the past adopts the be separated structure of mode of a kind of user data (User Data) and control data (Control Data) path.EP is an embedded processor among Fig. 1; SAR represents segmentation and collects; L3 represents the 3rd layer of forwarding capability in the processing capacity.

Fig. 2 is the structure chart of distributed architecture form exchange router system.This system contains the 3rd layer of processing capacity in the linkage unit that respectively networks in the past.Above-mentioned distributed architecture form exchanges the router system by crosspoint (210), networking linkage unit (220,230) and route service unit formations such as (240)

The above-mentioned linkage unit (220,230) that respectively networks all has the 3rd layer of processing capacity of self separately; In addition, upper strata Route Selection rules will be handled in above-mentioned route service unit (240), above-mentioned route service unit (240) and data communication path of existence between the 3rd layer of processing capacity position in the above-mentioned linkage unit (220,230) that respectively networks.Utilize this paths can remove to use crosspoint (210), but also can use the communication port (270) that between processor, is provided with in addition.

In Fig. 2, disclose the structure of distributed architecture form exchange router system.Because of each networking linkage unit (220,230) all contains the 3rd layer of processing capacity, so the service type route system structure that will be better than in Fig. 1, disclosing aspect the routing function.But the required hardware price of the system that builds is very expensive.Except that this weakness, with regard to above-mentioned ATM linkage unit (220), except that the 3rd layer function, need append a cell segmentation and (the Cell Segmentation andReassebly that collects again for the packet information (Data PacketInformation) that obtains being stated from the ATM cell, SAR) function, not only hardware price becomes very expensive for this reason, and can also produce the problem of loss function in by the SAR process.

In addition, the data communication that is transferred on the above-mentioned networking linkage unit (220,230) is not all to play to ask to carry out the 3rd layer of processing, therefore can not think that the usefulness price of distributed architecture form router system is worthwhile.Moreover, in the ATM networking,, need to introduce the 3rd layer of treatment technology as MPOA in order effectively to set up a kind of LAN net or internet that utilizes atm technology, at this moment owing to the actual traffic via the 3rd layer of processing procedure significantly descends, make and causing very big waste in price.Usually, for improving these problems, in being applied to the ATM net connected system in LAN field, will adopt service type system configuration as shown in Figure 1.

Fig. 3 briefly shows the course of work of illustrated service type exchange router system in Fig. 1.This is described in detail as follows.

In Fig. 3, the lan emulation atm information through the input of ATM net linkage unit is input to route service unit (340) by ATM cell crosspoint (310); Borrowing LEC (lan emulation client) to be transferred in the same segmentation or directly then is transferred in other the segmentation by routing function portion.At this,, need LE service unit (370) for managing and move the sectionalizer of these LAN.

In Fig. 3, the packets of information of footpath Ethernet linkage unit (330) input allows it obtain transmission with identical method by above-mentioned Route Selection service unit (340), will get 4 times more than via SAR module (380) so, will cause loss function for this reason.

Analyze in more detail with regard to above-mentioned conventional art content below.

Elder generation's brief description once＜Jong Arm Jun learn wooden magazine " ICT " 99 ' on the content of the paper " realization of MPOA--crossover router " delivered.

The crossover router that MPOA (ATM protocol specification) with 10Gbps level ATM function of exchange can be provided is proposed in this paper.This system that is referred to as SR-10 has connection Ethernet, three kinds of networking functions such as frame relay and ATM.Have SR--10 system that IP handles function and can avoid problems such as the bottleneck relevant that cause through router or deadlock on the net with the path; And at the network function that a brilliance is provided aspect the IP transfer function of ATM net.

In addition, SR--10 is basically by crosspoint, the line linkage unit, and Route Selection unit and control processor unit constitute.Crosspoint is called SRSU, and it provides the dualization function of hot standby form; And 5Gbps ATM cell exchange component made the byte cross-modality, the exchange capacity of 10Gbps is provided whereby.Three kinds of line linkage units comprise the STAU that the STM--1 linkage function is provided, and the FRAU of frame relay feature is provided and ETAU of Ethernet linkage function etc. is provided.

The route control unit that is referred to as IRCU provides MPOA service function and routing protocol processing capacity, and the ATM switching plane function that the SR--10 system provides is adapted to form the 3rd layer of function of exchange of other form as MPLS.

In addition, the invention that proposes in above-mentioned paper produces effect aspect extensive campus network or enterprises and institutions' net in the abnormal shape of setting up the coexistence of ATM net and Ethernet very much, and set up aspect the cost effective system-based also very effective.But, therefore be difficult to expectation effective the 3rd layer of processing capacity and high-performance because the 3rd layer of processing capacity and Route Selection controlled function form same service pattern.

The present invention is a scheme that proposes for the problem that solves the existence of above-mentioned conventional art aspect.Here it is by a system platform, provides the special-shaped linkage function more than two simultaneously to Ethernet and ATM net, and purpose is to provide Ethernet and LAN--emulation ATM communication provides a high performance switching route system.

The present invention includes ATM net linkage unit in order to reach aforesaid purpose, Ethernet linkage unit, high-speed atm cell switching unit, the 3rd layer of processing unit of service type and processor unit.Above-mentioned ATM net linkage unit, the 3rd layer of processing unit of Ethernet linkage unit and service type borrow switching port to be connected to high-speed atm cell switching unit, thereby obtain mutually connecting.Above-mentioned ATM net linkage unit has following two and carries out the function of transmitting.The one, during as if the ATM communication of importing lan emulation from the ATM net and cell communication, transmit to the 3rd layer of processing unit of above-mentioned service type; The 2nd, transmit to above-mentioned processor unit during as if OAM (operation and maintenance) cell of importing ATM cell communication or signal cell, just directly carry out the 3rd layer of processing capacity if the ethernet communication of input is the so above-mentioned Ethernet linkage unit of telex network, send and need be to the networking linkage unit of other segmentation then via above-mentioned processor unit; If not telex network, it just sends to above-mentioned processor unit so.From above-mentioned ATM net linkage unit input lan emulation--when ATM communication and cell communication, the 3rd layer of processing unit of above-mentioned service type carried out the function transmitted to other segmentation networking linkage unit according to LEC (local area network emulation client) environment and not via above-mentioned processor unit.Above-mentioned processor unit will make each unit initialization of system and monitor, and the packets data flow of transmitting is handled.Providing one thus, to provide linkage function simultaneously to ATM net and Ethernet be the switching route system of feature.

More detailed theory, above-mentioned processor unit will be connected respectively to three following unit on the above-mentioned high-speed atm cell switching unit.The one, the control and management processor, it carries out initialization and function for monitoring to each unit of system.The 2nd, the Route Selection service unit.It carries out upper strata Route Selection protocol data to the packets data flow that forwards from above-mentioned Ethernet linkage unit and handles.The 3rd, control and management processor and Route Selection service unit, they connect by two passages that inside is separated.A switching route system that to have above-mentioned connection means be feature is provided thus.

In addition more in more detail, above-mentioned control and management processor is carried out initialization and function for monitoring by other system monitoring passage to each unit of system.The characteristics of the switching route system that provides here are only to send out in the process of implementation to accept upward data necessary of row.In addition more in more detail, above-mentioned Ethernet linkage unit is carried out the 3rd layer of processing capacity to the telex network from Ethernet input, and is forwarded to other segmentation networking linkage unit and needn't be via above-mentioned processor unit.Here the switching route system that provides be exactly the 3rd layer of processor of profile with this pass-through mode be the system of feature.

In addition in more detail, above-mentioned Ethernet linkage unit, the 3rd layer of processing unit of processor unit and service type all are equipped with the SAR portion that is used for carrying out ATM cell SAR (segmentation with compilation) again function.This is again the switching route system that here provides

In addition more in more detail, the 3rd layer of processing unit of above-mentioned service type and the 3rd layer of handling part of profile will utilize the Lopa Nationality of break-through above-mentioned SAR portion and above-mentioned high-speed atm cell switching unit directly to send information.This is again characteristics of a switching route system.

Detail of the present invention is provided by following examples and accompanying drawing thereof.

Below, consult and use a good instance graph of the present invention and be elaborated.

Fig. 1 is the structure chart that general switching route system in the past is shown.

Fig. 2 illustrates the structure chart of profile structural form switching route system in the past.In respectively networking linkage unit, it contains the 3rd layer of processing capacity.

Fig. 3 briefly is illustrated in the function situation of illustrated service type switching route system among Fig. 1.

Fig. 4 illustrates an example of the present invention, i.e. the structure chart of switching route system.

Fig. 5 briefly illustrates an example of the present invention--the function situation of the telex network of switching route system.

Fig. 6 briefly is illustrated in an example of the present invention--the communication operations situation in the switching route system during non-telex network.

Fig. 7 is illustrated in the functional structure of illustrated ATM net linkage unit among Fig. 4.

Fig. 8 is illustrated in the functional structure of illustrated Ethernet linkage unit among Fig. 4.

Fig. 9 is illustrated in the communicate by letter functional structure of the 3rd layer of processing unit of illustrated ATM among Fig. 4.

Figure 10 is illustrated in the functional structure of illustrated processor unit among Fig. 4, and this processor unit contains Route Selection service unit and control and management processing unit.

Fig. 4 illustrates switching route system exemplary construction of the present invention.Above-mentioned switching route system is made up of following unit; High performance atm cell basic switching building (410), ATM net linkage unit (420), Ethernet linkage unit (430), it contains the 3rd layer of processing unit (431) of ethernet communication, Route Selection service unit (442), processor unit (440), it contains the 3rd layer of processing unit (450) etc. of control and management processing unit (441) and ATM communication.

Above-mentioned crosspoint (410), each linkage unit that networks (420,430), the 3rd layer of processing unit (450) of processor unit (440) and ATM communication etc. is to connect by switching port (460); The sending out of the system initialization of above-mentioned control and management processor unit (441) and system monitoring data taken in journey and to finish by the initialization and the supervision passage (490) that are provided with in addition.

In addition, at above-mentioned Ethernet linkage unit (430), be provided with SART-4 function portion (432,443,452) in the 3rd layer of processing unit (450) of processor unit (440) and ATM communication.This function portion provides the high performance ATM cell segmentation and the function that collects again.Above-mentioned SAR-4 function portion (432,443,452) connects the maximum bandwidth that the unit of unit may provide to Ethernet, can provide segmentation and the function that collects again.In this example, an Ethernet linkage unit, the Fast Ethernet traffic that is designed to accommodate maximum 4 Rui Kou, meanwhile the SAR-4 function portion of a unit is designed to provide the segmentation of respective communication amount and the function treatment ability that collects again.

Among Fig. 5, through the lan emulation ATM of ATM net linkage unit (520) input communication, be input to the 3rd layer of processing unit (540) ((1)) of ATM cell by ATM cell crosspoint (510), according to the environment of LEC, needn't directly send to the networking linkage unit ((3)) ((4)) of other segmentation simultaneously via Route Selection service unit (580).In Fig. 5, be forwarded to the networking linkage unit ((5)) of other segmentation by the 3rd layer of processing unit (531) of ethernet communication through the packets data flow of Ethernet linkage unit (530) input; And need not be via Route Selection service unit (580).The 3rd layer of processing unit (531) is included in the Ethernet linkage unit (530).At this, lan segment management and operation for such are provided with LE service unit (570).

Fig. 6 briefly shows an example of the present invention, promptly is not the function situation of this communication under the situation of telex network in switching route system.This is described in detail as follows.

In Fig. 6, in the cell or packet communication of ATM net linkage unit (620) or Ethernet linkage unit (630) input, the data that need in the routing protocol of upper strata, should obtain handling, be forwarded to Route Selection service unit (680), and obtain handling ((7)) by Route Selection processor (681).Here, if data are ATM cell communication, the 3rd layer of processing unit (640) ((6)) by ATM cell is forwarded on the Route Selection service unit (680) so; If data are packet communications of Ethernet, the 3rd layer of processing unit (631) by ethernet communication is forwarded to by on the selection service unit (680) so, and wherein processing unit (631) is included in the Ethernet linkage unit (630).

By the SAR-4 function portion (632,642,683) of each unit, conversion (Segmentation) becomes the desired cell form of ATM cell crosspoint (610), perhaps carries out inverse transformation (Reassembly) in such forwarding reception and registration process.

In addition, in Fig. 6, be to provide from Route Selection service processor (681) at each the 3rd layer forwarding information of handling (631,641); The renewal of this forwarding information then utilizes the switching path of break-through SAR-4 function portion (632,683) and ATM cell crosspoint (610) to finish ((8)).

Also have, oam cell or signal cell through the ATM cell of ATM net linkage unit (620) input is communicated by letter as shown in Figure 6, are sent to the control and management processor (682) that is included in the Route Selection service unit (680) and obtain handling ((9)); Each the unit initialization of system undertaken by control and management processor (682) and the data of function for monitoring are sent out to receive and are communicated by letter, and are finished by initialization and system monitoring passage (690).

Fig. 7 is illustrated in the functional structure chart of illustrated ATM net linkage unit among Fig. 4.Above-mentioned ATM net linkage unit (720), generally by physical medium connecting portion (710), physical layering handling part (722), ATM layering handling part (721) and form by initialization and system monitoring channel interface portion (740).

Above-mentioned physical layering portion (722) is designed to accommodate the STM-1 communication of 4 ports in this example basically, perhaps accommodates the STM-4 communication process portion of 1 port.And, at the ATM of this example linkage unit (720), be designed to have the ability that can accommodate 16 STM-1 ports or can accommodate 4 STM-4 ports basically, but the number of port will be changed according to actual conditions.

In addition, above-mentioned ATM layering handling part (721) connects with physics layering handling part (722) with UTOPIAI or II mode; By the direction of collecting mail, from the ATM cell that above-mentioned physical layering (722) sends, header information (Head Information) and pay(useful) load information (Payload) are separated, then respectively header information send to the exchange control part and pay(useful) load information send to the exchange storage buffer on; And according to pressing direction of transfer,, from the exchange storage buffer, read corresponding pay(useful) load information, and it is weaved into be transferred to above-mentioned physical layering handling part (720) again after transmitting cell to the cell header information that the exchange control part sends over.

Above-mentioned initialization and system monitoring channel interface (740) provide the interface function of being responsible for initialization and system monitoring passage by control and management processor unit (441).Unit (441) is included in the processing unit (440) of Fig. 4.The control and management processing unit (441) of Fig. 4 is carried out initialization by physical layering handling part (722) and ATM layering handling part (721) that above-mentioned initialization and system monitoring channel interface (740) go to visit Fig. 7, and obtains monitor message as required or send control/order data.In addition, in each above-mentioned ATM layering handling part (721), provide external interface, be used for collecting oam cell, so that ABR processing capacity or other management function are provided.

Fig. 8 is illustrated in the functional structure chart of illustrated Ethernet linkage unit among Fig. 4.Above-mentioned Ethernet linkage unit (810) is generally by physical medium connecting portion (850), physical layering handling part (830), and Ethernet handling part (820), the 3rd layer of handling part (840) and initialization and system monitoring channel interface (860) are formed.

Above-mentioned physical layering handling part (830) designs by the Fast Ethernet communication that can accommodate 4 ports or the Gigabit Ethernet communication that can accommodate 1 port in this example basically.And the Ethernet linkage unit (810) of this example designs by the ability that can accommodate 16 high-speed Ethernet port or 4 Gigabit Ethernet ports basically, but the number of port will can change with actual state.

On the one hand, above-mentioned Ethernet handling part (820) is born following task.It utilizes the MII mode to be connected to above-mentioned physical layering handling part (830), and from by the destination to the Ethernet bag that sends by above-mentioned physical layering handling part (830), extract header information and send above-mentioned the 3rd layer of handling part (840) to, obtain and transmit purpose location information, again the purpose location information that obtains is weaved into cell header and send the exchange control part to; In addition packets data flow is weaved into a series of pay(useful) load information by cell unit, send the exchange storage buffer to.On the other hand, according to from the exchange storage buffer, reading a succession of corresponding pay(useful) load information for the exchange cell header information of delivering letters that control part sends, weave into the bag of delivering letters then and send above-mentioned physical layering handling part (830) to by the direction of delivering letters.

The effect of above-mentioned the 3rd layer of handling part (840) is after above-mentioned Ethernet handling part receives the header information of the bag of collecting mail, and again through the process of tabling look-up, provides the purpose location information etc. of transmitting to the bag of appointment.

Above-mentioned initialization and system monitoring channel interface (860) provide the interface function of being responsible for initialization and system monitoring passage by control and management processor unit (441).Unit (441) is included among Fig. 4 in the illustrated processor unit (440).Illustrated control and management processor unit (441) in Fig. 4, carry out initialization by physical layering handling part (830) and Ethernet handling part (820) that above-mentioned initialization and system monitoring channel interface (860) go to visit Fig. 8, but also obtain monitor message or transmitting control commands data as required.

Fig. 9 is illustrated among Fig. 4 illustrated to the communicate by letter functional structure chart of the 3rd layer of processing unit of ATM.The 3rd layer of processing unit (910) of above-mentioned ATM communication has basically a kind ofly runs the functional structure of Ethernet handling part (820) with loop back mode, but is not included among Fig. 8 physical medium connecting portion (850) and physical layering handling part (830) in the illustrated Ethernet linkage unit here.

In illustrated ATM cell communication in Fig. 7, to requiring to carry out the cell of the 3rd layer of processing, will be sent to ATM the 3rd layer of processing unit (910) of communicating by letter by crosspoint (410) by ATM net linkage unit input.

Illustrated ATM the 3rd layer of processing unit (910) of communicating by letter reads corresponding a succession of pay(useful) load information from exchange the storage buffer according to the cell header information of delivering letters that passes to the exchange control part in Fig. 9, then it is weaved into bag and send, import to the destination once more according to the situation of loopback so to the direction of delivering letters.The header information that the destination then extracts input bag is issued the 3rd layer of handling part (930) and is obtained the purpose location information of transmitting, again the header information that obtains is weaved into the cell header form and be sent to the exchange control part, in addition packets data flow is weaved into a series of pay(useful) load information by cell unit, send the exchange storage buffer in the mode that transmits that distributes then.

The effect of the 3rd layer of handling part (930) is to go to provide the forwarding purpose location information of specifying bag through the process of tabling look-up after Ethernet handling part (920) receives the bag header information that receives with echoplex mode.

Figure 10 illustrates the functional structure chart of a processor unit.This processor is included in illustrated Route Selection service unit and control and management processor unit among Fig. 4.Above-mentioned processor unit (1010) is made up of two processing environments and SAR and path interface controller (1030) basically.Two processing environments are used as Route Selection service unit (1020) and control and management processor unit (1040) respectively.

Above-mentioned control and management processor unit (1040) is also had initialization and system to look at and is looked passage controller (1042) composition by the memory and the input and output element of control and management processor (1041) and various uses.

On the other hand, above-mentioned Route Selection service unit (1020) is made up of memory and the input and output element of selecting service processor (1021) and various uses.These two processing environments link to each other with crosspoint respectively by an above-mentioned SAR and two passages that are separated from each other in path interface controller (1030).Above-mentioned SAR and path interface controller (1030) will with at Fig. 7, illustrated ATM layering handling part (721) among Fig. 8 and Fig. 9, Ethernet handling part (820,920) is connected on the exchange storage buffer in identical mode, and the method for its data communication is also identical.

On the one hand, initialization and system monitoring passage controller (1042) will form an initialization and system monitoring passage (1050), and play main let it be effect.This passage is for the initialization of each element in each hardware of system and system management are that purpose is set up, and is used for system monitoring and sends out to take into custody and look data.

Aforesaid the present invention can write down with the recording medium that computer reads and can handle with computer.

As describing in detail in front, the present invention is as basic platform with the high-speed atm cell switching, the size of the ATM traffic by the 3rd layer of processing of demand provides the 3rd a layer of processing capacity can mildly forming service type, and possess the service type that couple ATM communication is arranged simultaneously and handle structure for the 3rd layer the profile of ethernet communication is handled structure for the 3rd layer, for set up an ATM net and Ethernet coexist mutually quality high in extensive campus network or enterprises and institutions' net provides very effective and the usefulness cost is a very worthwhile system-based.

In front, in conjunction with the accompanying drawings technological thought of the present invention is narrated, but just selected a best example to illustrate here, and non-limiting coverage of the present invention.In addition, very clear, as long as have common technological know-how in this technical field, anybody can carry out various distortion and imitation in the scope that does not break away from technological thought category of the present invention so.

Claims

1, a kind of serves as basis and the high-performance switching route system that can handle ATM and ethernet communication effectively with the high-speed atm cell switching, it comprises ATM net linkage unit Ethernet linkage unit, high-speed atm cell switching unit, the 3rd layer of processing unit of service type and processor unit; It is characterized in that:

Above-mentioned ATM net linkage unit, the 3rd layer of processing unit of Ethernet linkage unit and service type is owing to being connected with high-speed atm cell switching unit by switching port and obtaining mutually connecting;

Above-mentioned ATM net linkage unit will be carried out following function.Be the ATM communication and the cell communication of LAN emulation even from ATM net input, send it to the 3rd layer of processing unit of above-mentioned service type so, as if what import from the ATM net is the oam cell or the signal cell of ATM cell communication, sends it to above-mentioned processor unit so;

Above-mentioned Ethernet linkage unit will be carried out following function.Even Shu Ru ethernet communication is telex network, so directly carries out the networking linkage unit that the 3rd layer of processing capacity is transmitted to other segmentation afterwards, need not be via above-mentioned processing unit; If not telex network is transmitted to the processor unit so;

The 3rd layer of processing unit of above-mentioned service type carried out such function.Even from the ATM communication and the cell communication of ATM net linkage unit input LAN emulation, so according to LEC (The LAN Emulation Technology client computer) environment be transmitted to other segmentation the networking linkage unit and not via above-mentioned processor unit.

Following function is carried out in above-mentioned processor unit.This processor unit is connected to high-speed atm cell switching unit and makes each unit initialization of system and it is monitored, and the packets data flow of transmitting is handled.Can set up thus that an energy provides linkage function simultaneously to ATM net and Ethernet and based on the high-performance switching route system of high-speed atm cell switching, in order to effective processing ATM and ethernet communication.

2, according to the described switching route system of claim 1, it is characterized in that: above-mentioned processor unit is connected respectively to above-mentioned high-speed atm cell switching unit to above-mentioned control and management processor and Route Selection service unit with control and management processor and Route Selection service unit and two passages by being separated from each other in inside.Comprise that above-mentioned connection means are the switching route system of characteristics.Here, above-mentioned control and management processor is carried out initialization and the function for monitoring to each unit of system; And above-mentioned Route Selection service unit is carried out such function, promptly the packets data flow that forwards from above-mentioned Ethernet linkage unit is carried out the data processing of upper strata routing protocol.

3, switching route system according to claim 2 is characterized in that: above-mentioned control and management processor is carried out initialization and function for monitoring by the system monitoring passage that other establishes to each unit of system.Only sending out in this process and receiving data necessary is the switching route system of characteristics.

4, switching route system according to claim 1, it is characterized in that: above-mentioned Ethernet linkage unit is carried out the 3rd layer of processing capacity to the telex network from Ethernet input, then it is forwarded to other segmentation networking linkage unit and needn't be via above-mentioned processor unit.The 3rd layer of processor of profile with this pass-through mode is the switching route system of characteristics.

5, according to claim 1,2 or 4 described switching route systems, it is characterized in that: above-mentioned Ethernet linkage unit comprises the switching route system that SAR portion is characteristics on the 3rd layer of processing unit of processor unit and service type.Wherein SAR portion is in order to the segmentation of the carrying out ATM cell function that collects again.

6, switching route system according to claim 5 is characterized in that: the 3rd layer of processing unit of above-mentioned service type and the 3rd layer of handling part of profile utilize the switching path of break-through above-mentioned SAR portion and above-mentioned high-speed atm cell switching unit to remove to finish the switching route system that forwarding information is updated to characteristics.