CN1870571A

CN1870571A - Method and system for service conversion in virtual exchange system

Info

Publication number: CN1870571A
Application number: CNA2005100816966A
Authority: CN
Inventors: 段小军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-07-15
Filing date: 2005-07-15
Publication date: 2006-11-29
Anticipated expiration: 2025-07-15
Also published as: CN100414931C

Abstract

This invention relates to a realization method and a system of service transmission in a virtual switch, which gets a VLAN label sequence necessary for the service transmission sent by the connection control entity VSC and packages it in the shape of VLAN label stack in front of the data packet based on said label sequence to process the service transmission in the stack mode, which avoids the dependence to the DRE interface in a V-Switch system and avoids the signaling interaction with the middle DRE, which supports the QinQ technology only, the edge DRE needs a signaling interface with the VSC and supports the QinQ technology too to realize service transmission process.

Description

Professional implementation method and the system that transmits in the virtual exchange system

Technical field

The present invention relates to network communications technology field, relate in particular to professional implementation method and the system that transmits in a kind of virtual exchange system.

Background technology

Along with the continuous increase of Internet scale, various network services are fallen over each other to emerge in large numbers, and advanced multimedia system emerges in an endless stream.Because real time business is comparatively responsive to characteristics such as network transfer delay, delay jitters, when sudden high FTP (file transfer protocol (FTP)) being arranged on the network or contain the business such as HTTP (HTML (Hypertext Markup Language)) of image file, real time business will be subjected to very big influence; On the other hand, multimedia service a large amount of bandwidth that accounted for, like this, the key business that existing network will guarantee just is difficult to be transmitted reliably.So various QoS (service quality) technology is arisen at the historic moment.IETF (the Internet engineering duty group) has advised a lot of service models and mechanism, to satisfy the demand of QoS.

Multiple application and service and broadband multimedia services based on door, being included as the ordinary residence user provides the online game of abundant Video (video)/Audio (audio frequency) stream, VoD (video request program), video multicast, multimedia interactive, high bandwidth requirements, for the business user provides video conference, long-distance education, VPN (VPN), has Leased line that QoS (service quality) ensures, IPHotel etc., become the important content of broadband operation.

At described business user, the VPN/VPDN special line scheme of the formula of V-Switch (empty exchange) has been proposed.Described virtual switch technology is mainly used in to set up to be stablized; practical; economic operation level Metro Ethernet; can realize that QoS guarantees; network security protection; functions such as carrier-class network operation and management; possesses user management based on number; certain mobility; the core business managerial abilities such as centralized management that professional open management is chargeed; provide and comprise intelligent two laminar flow amounts scheduling; the LAN special line; professional and service such as IP flow planning; the present deficiency of network on pure two layers of ability filled up in the appearance of virtual switch technology, and the construction of new period metropolitan area network is had important effect.

The V-Switch architecture possesses exchange of perfect ethernet vlan and scheduling feature, the means of service dispatching and foundation, adjustment flexibly, and abundant and extendible two layer service providing capabilities, perfect oam instrument and information.

The structure of described V-Switch system specifically is divided into three layers as shown in Figure 1: the V-Switch service control layer, V-Switch connects key-course, V-Switch bearing capacity layer.

The connection key-course of described V-Switch is used for safeguarding DRE (Data Relay Entity) exchange resource, comprise equipment, interface, link, vlan information etc., and the V-Switch of layer SCR (operation controlling entity) that be used to accept business sets up request, for connecting, this V-Switch selects service flow path, distribute bandwidth and VLAN resource, control information is issued on the DRE equipment of Business Stream process.

Described DRE is in the bearing capacity layer, according to connecting the VLAN exchange table entries that key-course is provided with, finishes the forwarding to the Business Stream of ethernet frame format.

Described VLAN exchange table entries comprises following content:

	Parameter	Parameter declaration
	Parameter	Parameter declaration	1	Interface 1	Business Stream is transmitted interface 1, as GE 1/0/0
2	vlan id 1	The VLAN ID that Business Stream carries in the ethernet frame format on interface 1	1	Interface 1	Business Stream is transmitted interface 1, as GE 1/0/0
2	vlan id 1		3	Interface 2	Business Stream is transmitted interface 2, as GE 1/0/1
4	vlan id 2	The VLAN ID that Business Stream carries in the ethernet frame format on interface 2	3	Interface 2	Business Stream is transmitted interface 2, as GE 1/0/1
4	vlan id 2		5	Bandwidth	The Business Stream bandwidth constraints
5.1	Up maximum bandwidth	Business Stream up (receive from interface 1, send) maximum bandwidth from interface 2	5	Bandwidth	The Business Stream bandwidth constraints
5.1	Up maximum bandwidth		5.2	Descending maximum bandwidth	Business Stream descending (receive from interface 2, send) maximum bandwidth from interface 1
6	Qos parameter	The requirement of Business Stream qos parameter	5.2	Descending maximum bandwidth
6	Qos parameter	The requirement of Business Stream qos parameter	6.1	Postpone
6.2	Delay jitter		6.1	Postpone
6.2	Delay jitter		6.3	Packet loss

The route foundation that DRE transmits as Business Stream with the VLAN swap table, corresponding business forwarding of data process prescription is as follows:

When being sent to interface 2, the ethernet frame of the vlan id 1 that receives in the interface 1 converts vlan id 1 to vlan id 2; And convert vlan id 2 to vlan id 1 when the ethernet frame of the vlan id 2 that receives in the interface 2 sent to interface 1.

By above-mentioned processing form, can set up a special line, the i.e. Virtual Channel of VLAN at whole network, described Virtual Channel is described as: (equipment 1, interface 1, vlan id 1)-(equipment 1, interface 2, vlan id 2)-(equipment 2, interface 3, vlan id 2)-(equipment 2, interface 1, vlan id3) ..., and the like.

Each DRE of bearing capacity layer is forwarded on an outgoing interface and the VLAN according to an incoming interface and VLAN, all needs to keep the VLAN swap table on each DRE, and each DRE need be connected key-course and have Signalling exchange to obtain this swap table.Therefore, require each DRE will be connected key-course equipment (being VSC) signaling interface will be arranged, otherwise, as long as any one DRE and VSC do not have signaling interface, just can't set up whole special line, can not finish the VLAN repeating process of relay-type, thereby make that the equipment requirements to the bearing capacity layer is very high in professional repeating process.

In addition, if signaling interface is not realized according to unified standard between described DRE and the VSC, then the DRE of each producer possibly can't support with a kind of signaling interface, causes corresponding DRE can't finish with docking of VSC, causes realizing professional forwarding.

Summary of the invention

In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide professional implementation method and the system that transmits in a kind of virtual exchange system, thereby the business in the virtual exchange system that can realize is comparatively easily transmitted processing.

The objective of the invention is to be achieved through the following technical solutions:

The invention provides the professional implementation method of transmitting in a kind of virtual exchange system, comprising:

Connection key-course entity VSC in virtual exchange system finishes the routing of Business Stream and the distribution of virtual LAN VLAN label, and the distributed labels sequence is handed down to the inlet DRE of bearing capacity layer, carry out business according to described VLAN sequence label with VLAN label stack form by inlet DRE and transmit processing.

Method of the present invention specifically comprises:

A, corresponding VLAN label range is set for each DRE in the empty exchange V-Switch territory;

On B, the connection key-course entity VSC in virtual exchange system, E.164 number attribute according to source user and purpose user is searched route, select each DRE of bearer service, determine the omnidistance VLAN sequence label of professional forward-path according to the VLAN label of each DRE correspondence, and be handed down to the inlet DRE of network edge;

C, at inlet DRE, middle DRE, and outlet DRE goes up and to carry out business according to described VLAN sequence label with the form of VLAN label stack and transmit processing.

Each DRE in the described empty exchange V-Switch territory comprise edge DRE and middle DRE, and each VLAN label of its correspondence is unique for this DRE goes up, and described VLAN label is corresponding to physical interface and the physics VLAN label of corresponding DRE.

Described step B comprises:

B1, the number information according to the purpose user on VSC carry out route, determine each DRE on the professional forward-path, determine that then each DRE goes up idle VLAN label, and purpose user's physics VLAN label as last label, form the VLAN sequence label, be handed down to described network edge inlet DRE with the form of Signalling exchange.

Described step B1 comprises:

For the business of cross-domain forwarding, the VSC of source user ownership need pass through Signalling exchange each other up to the VSC of purpose user attaching with the VSC of adjacent domains, and the VLAN sequence label of professional forward-path is determined in cooperation mutually.

Described step C comprises:

C1, on described DRE, carry out business according to the stack top label of the VLAN label stack of packet and transmit and handle.

Described step C1 comprises:

C11, on the inlet DRE of business, the physical interface and the physics vlan information identification services of the source user in the stream information that issues according to VSC, peel off the physics VLAN label of the source user of packet after the identification, and the VLAN sequence label that before packet, issues with the form packaging V SC of storehouse;

C12, the form of handling with the VLAN label stack according to the VLAN label stack at each DRE are carried out business and are transmitted processing.

The content of described VLAN label stack comprises:

The VLAN label of inlet DRE in the V-Switch territory, the VLAN label of middle each DRE, the VLAN label of outlet DRE, and purpose user's physics VLAN label, and vertical sequence label formed stack top at the bottom of the stack successively;

Described step C12 comprises:

On middle each DRE of forward-path, the packet that reception is to be transmitted, the stack top VLAN label of VLAN label stack is scaled the mode of physical interface and physics VLAN label, carry out business forwarding processing according to physical interface after converting and physics VLAN label, and eject the stack top VLAN label of VLAN label stack.

On outlet DRE, the packet that reception is to be transmitted, the stack top label of VLAN label stack is scaled the mode of physical interface and physics VLAN label, carry out business forwarding processing according to physical interface after converting and physics VLAN label, and the stack top VLAN label of ejection logic VLAN label stack, the only remaining physics VLAN label that is positioned at the purpose user at the bottom of the stack, packet breaks away from the V-Switch territory, enter the network at purpose user place, purpose user receives the final data bag according to this physics VLAN label.

The invention provides a kind of virtual exchange system V-Switch system, comprise service control layer entity SCR, connect key-course entity VSC and bearing capacity layer entity DRE, and described VSC only sets up signalling path with the DRE of network edge, need not to set up signalling path, and the business that VSC determines is transmitted the inlet DRE that the VLAN sequence label that needs is handed down to described network edge with middle DRE.

Described VSC also is connected communication with adjacent VSC, is used for determining the professional VLAN label stack of transmitting needs.

As seen from the above technical solution provided by the invention, the present invention compares with the professional implementation of transmitting of V-Switch of the prior art, the interface of DRE and VSC was realized in the middle of the main distinction was no longer to rely on, and corresponding middle DRE is as long as support the QinQ technology just can realize the professional processing of transmitting.

Therefore, DRE can no longer and set up signalling path in the middle of realization of the present invention made between the VSC, VSC only need have signaling interface to get final product with edge DRE, thereby make the dependence in the V-Switch system reduce greatly to middle DRE, and the Signalling exchange between VSC and the DRE significantly reduces, the realization that business datum is transmitted is comparatively simple, and practicality is stronger.

Description of drawings

Fig. 1 is the structural model schematic diagram of V-Switch system;

Fig. 2 is the process chart of method of the present invention;

Fig. 3 is the structural representation of system of the present invention.

Embodiment

Core of the present invention is to require too high at each DRE to the loading capability layer in the prior art, need each DRE and VSC to set up signalling path, and actual capabilities can't each DRE can both be carried out the shortcoming of Signalling exchange with VSC, propose a new solution.

Among the present invention, only require that the inlet DRE and the VSC that are in network edge have Signalling exchange, support the QinQ technology simultaneously, DRE in the middle of the metropolitan area network can not have signaling to be connected with VSC, it is just passable only to need to transmit data according to QinQ (VLAN label stack), the processing procedure that the method for the invention provides comprises as shown in Figure 2:

Step 21: will be Business Stream routing and assignment logic VLAN label (being the VLAN label of each DRE correspondence) by VSC, just determined after finishing the path correspondence the VLAN sequence label, the physics VLAN label that comprises the purpose user, and be issued to this inlet DRE with the form of signaling;

Be specially by VSC with the whole service forward-path via the VLAN label of DRE correspondence be pressed in the same label stack as the professional VLAN label stack of using of transmitting;

The VLAN label of described DRE correspondence is self unique logic VLAN label of the correspondence that is provided with respectively at each DRE, and each DRE comprises at least one logic VLAN label, maximum 4096 logic VLAN labels;

Step 22: utilize Business Stream identification and classification by inlet DRE, peel off the user vlan tag (VLAN label) that encapsulates in user's Ethernet data bag;

Step 23: the form with the VLAN label stack before the user data package of having peeled off the user vlan label encapsulates a VLAN tag sequence that is issued by VSC again;

Described VLAN tag storehouse comprises from inlet DRE, and DRE in the middle of each to the whole process logic VLAN tag information of outlet DRE, also has purpose user's physics VLAN tag at last in the V-Switch territory;

Step 24: inlet DRE, middle DRE, and outlet DRE is scaled corresponding physical interface and physics VLAN tag according to the stack top VLAN tag of VLAN label stack, transmit according to corresponding physical interface and physics VLAN tag then, and eject stack top logic VLAN tag, be forwarded to next DRE, next DRE similarly transmits operation, the rest may be inferred, finally arrives the destination up to data, finally finishes the data forwarding process of V-Switch.

Below in conjunction with accompanying drawing specific implementation of the present invention is described.

VLAN Stack (VLAN label stack), be called QinQ again, be to address based on a kind of visualization of the tunnel protocol of 802.1Q encapsulation, its core concept is that user private network VLAN tag is encapsulated on the public network VLAN tag, the message band the backbone network that two-layer tag passes through service provider, deletion public network VLAN tag when withdrawing from service provider network, thus a kind of comparatively simple two-layer VPN tunnel provided for the user.

From prior art as can be known, the structure of V-Swicth system comprises service control layer, connects key-course and bearing capacity layer, and described three layers representational entity title is called SCR (operation controlling entity) respectively, VSC (connecting the key-course entity), DRE (Data Relay Entity).The structure of system of the present invention as shown in Figure 3, only between VSC and network edge DRE, set up signalling path, be used for VSC with the routing information of selecting, be that the VLAN label stack is handed down to described edge DRE, simultaneously for satisfy the cross-domain professional needs of transmitting also needs between VSC and adjacent VSC, establish a communications link, realize the selection of professional forward-path to cooperate with each other, determine the VLAN label stack information that corresponding business is transmitted to be needed.

The service control layer of described V-Switch can be a physical entity with being connected key-course, also can be two physical entities separately, but three layers of function of being finished are different, and the service control layer of V-Switch is used to finish professional control and registration of V-Switch special line or the like;

The connection key-course of described V-Switch is safeguarded exchange resource among the DRE, described exchange resource comprises equipment, interface, link, VLAN etc., the V-Switch of key-course SCR of being used to accept business sets up request, for connecting, this V-Switch selects service flow path, distribute bandwidth and VLAN resource, and control information is issued on the DRE equipment of Business Stream process.

Among the present invention, unlike the prior art be each DRE of bearing capacity layer be provided with one relative self, the VLAN tag set of globalize, globalize can be understood as for self and does not repeat situation, be unique label and be referred to as logic VLAN label, corresponding to (physical interface, the physics VLAN label) on the DRE.But the logic VLAN label of different DRE can be identical.

Described logic VLAN tag is unique on DRE, just as the VLAN tag on each interface on each DRE must be unique, LSP tag number on similar and the LSR (label interconnected router), described logic VLAN tag can be the set of selecting some mutual unduplicated physics VLAN tag from several physical interfaces, and this each logic VLAN tag value of set the inside can equal the physics VLAN tag on the physical interface, also can be not equal to, it also can be certain conversion relation, can select situation about equaling during simple realization, for example:

The VLAN 1 to VLAN 20 that can select physical interface 1 is respectively as logic VLAN 1 to VLAN20, simultaneously, the VLAN 21 to VLAN 40 that selects physical interface 2 is respectively as logic VLAN 21 to VLAN 40, the VLAN 41 to VLAN 60 of physical interface 3 is respectively as logic VLAN 41 to VLAN60, like this, known that logic VLAN tag just can calculate its physical port number and physics VLAN tag accordingly, i.e. logic VLAN tag and (physical interface, physics VLAN tag) correspondence;

That is to say that based on foregoing description, known that logic VLAN 15 just can know that its corresponding physical interface is an interface 1, physics VLAN also is 15, i.e. logic VLAN 15 correspondences (physical interface 1, physics VLAN 15); Known that logic VLAN 25 just can know that its corresponding physical interface is an interface 2, physics VLAN also is 25, i.e. logic VLAN 25 correspondences (physical interface 2, physics VLAN 25); And the like.

For the DRE that constitutes the V-Switch territory, corresponding logic VLAN tag not necessarily needs a lot, be no more than 4096 just passable, because for the special line of setting up the V-Switch territory, a V-Switch territory does not need to set up the special line of 4096 above quantity usually, each DRE has 4096 logic VLAN tag just much of that, and each logic VLAN tag can be used for setting up a V-Switch special line.

Among the present invention, essence is pointed to (physical port, physics VLAN tag) for adopting logic VLAN.Can certainly realize the notion of this logic VLAN tag by other mode.For example, the DRE of bearing capacity layer can not have (physical port, physics VLAN tag) this form yet in the time of realization, has only the notion of logic VLAN tag, does not have conversion relation like this, realizes simpler.

Only emphasize among the present invention that special line that VSC brings according to SCR sets up request message and select the VLAN label stack corresponding with routing information (being the VLAN label stack) information, and be issued to the inlet DRE, then, each DRE carries out the implementation of data forwarding according to the VLAN label stack, thereby simplifies the requirement that reduces the ability and the standard of realization of the DRE in the network.

Among the present invention, VSC descends the DRE of the routing information of several VLAN tag storehouses of hair band to ingress edge after finishing the Business Stream routing, it is the V-Switch Business Stream that interface number that inlet DRE carries according to the user in the time of data forwarding and VLAN tag identify it, peel off the VLAN tag that encapsulates in user's Ethernet data bag then, before user data package, encapsulate a VLAN label stack more again, described VLAN label stack information is exactly to be handed down to inlet DRE's after VSC finishes routing, be the VLAN tag of logic, final approach DRE, middle DRE and outlet DRE are according to the stack top logic VLAN tag of VLAN label stack, be scaled (physical interface, physics VLAN label) mode is transmitted data, eject stack top logic VLAN tag during forwarding, the rest may be inferred, finally arrives the destination up to data.

Among the present invention, signaling and repeating process mainly comprise the signaling process process of VSC and edge DRE, and identification of the Business Stream on DRE and data forwarding processing procedure, specifically describe as follows:

(1) signaling procedure of VSC and edge DRE:

VSC only need have signaling interface with edge DRE, VSC is in routing, number information according to the purpose user carries out route, and, for cross-domain situation of carrying out professional forwarding, need adjacent VSC to cooperate by Signalling exchange up to purpose VSC, finish the routing of Business Stream jointly, select the omnidistance DRE sequence of bearer service, the logic VLAN label that distributes the free time on omnidistance each DRE simultaneously, obtain corresponding VLAN sequence label, the corresponding professional forward-path of described VLAN sequence label;

(the physical interface of the corresponding DRE of this logic VLAN tag, physics VLAN tag), and, add that purpose user's privately owned physics VLAN tag information is formed sequence label the logic VLAN tag sequence that whole process chooses, be issued to inlet DRE in conjunction with other qos parameter and stream id information.

(2) Business Stream identification and data forwarding process:

The information Recognition Business Stream that inlet DRE issues according to VSC, it mainly is (the incoming interface number of comparing data stream, the physics vlan number) whether the information that issues with VSC (incoming interface number with physics VLAN tag information) is consistent, if it is consistent then peel off the private network VLAN tag that encapsulates in user's Ethernet data bag, and utilize QinQ technology form with the VLAN label stack before user data package to encapsulate a VLAN tag sequence that issues by VSC again, if, inconsistent, then the present invention is indifferent to the processing mode at respective stream of data;

At inlet DRE, middle DRE, reach outlet DRE and upward all be scaled (physical interface, physics VLAN label) according to the stack top VLANtag of VLAN label stack, and according to physical interface and physics VLAN label forwarding data, eject stack top VLAN tag during forwarding, be forwarded to next DRE, next DRE similarly transmits operation, and the rest may be inferred, finally arrive destination D up to data, finally finish the data forwarding process of V-Switch.

The simple declaration data forwarding flow process of will giving an example again below:

Still as shown in Figure 3, source user UE1 carries VLAN 100 and sends data to the purpose user UE2 of n the interface that is positioned at outlet DRE6 from m the interface of DRE1, and the DRE1 that enters the mouth identifies after the Business Stream according to (physical interface, the physics VLAN tag) of source user, peel off user vlan 100 for this traffic data, then on data again with VLAN sequence label that issues by VSC of the form of VLAN label stack encapsulation, at the bottom of from stack top to stack be successively: 10,20,30,40,50,200; Wherein VLAN 10,20,30,40,50th, the logic VLAN tag of the DRE on the forward-path, and VLAN200 is purpose user's physics VLAN tag.

Then, DRE1 is scaled (physical interface, physics VLANtag) according to stack top logic VLAN 10, is forwarded to DRE2 according to (physical interface, physics VLAN tag) then, and ejects stack top VLAN 10; DRE2 is scaled (physical interface, physics VLANtag) according to stack top logic VLAN 20, is forwarded to DRE4 according to (physical interface, physics VLAN tag) then, and ejects stack top VLAN 20; DRE4 is scaled (physical interface, physics VLANtag) according to logic stack top VLAN 30, is forwarded to DRE5 according to (physical interface, physics VLAN tag) then, and ejects stack top VLAN 30; DRE5 is scaled (physical interface, physics VLANtag) according to stack top logic VLAN 40, is forwarded to DRE6 according to (physical interface, physics VLAN tag) then, and ejects stack top VLAN 40; DRE6 is scaled (physical interface according to stack top logic VLAN 50, physics VLANtag), be forwarded to the physical interface of the outlet DRE at purpose user place then according to (physical interface, physics VLAN tag), and ejection stack top VLAN 50, remaining VLAN 200 and DATA break away from the V-Switch territory, arrive purpose user's vlan domain, because the purpose user is also in VLAN 200 territories, so purpose user can receive the DATA (data) that is sent by source user, so far, data forwarding is finished.

If two-way data forwarding, be that UE2 will transmit data simultaneously to UE1, DRE6 is as inlet DRE so, DRE1 is as outlet DRE, VSC2 will issue routing iinformation simultaneously and give DRE6 after finishing route, the inlet DRE that DRE6 transmits as reverse data, follow-up reverse traffic repeating process is identical with top forward forwarding process, so no longer describe in detail.

In sum, the present invention has avoided in the V-Switch system dependence to the interface of middle DRE, middle DRE is as long as support the QinQ technology, and VSC only need have signaling interface just can realize the professional processing of transmitting with edge DRE, make the V-Switch system not have interface and rely on that Signalling exchange significantly reduces, make the V-Switch scheme simplify middle DRE, realize simplyr, practicality strengthens.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims

1, the professional implementation method of transmitting in a kind of virtual exchange system is characterized in that, comprising:

2, the professional implementation method of transmitting in the virtual exchange system according to claim 1 is characterized in that this method specifically comprises:

3, the professional implementation method of transmitting in the virtual exchange system according to claim 2, it is characterized in that, each DRE in the described empty exchange V-Switch territory, comprise edge DRE and middle DRE, and each VLAN label of its correspondence is unique for this DRE goes up, and described VLAN label is corresponding to physical interface and the physics VLAN label of corresponding DRE.

4, the professional implementation method of transmitting in the virtual exchange system according to claim 2 is characterized in that described step B comprises:

5, the professional implementation method of transmitting in the virtual exchange system according to claim 4 is characterized in that described step B1 comprises:

6, according to the professional implementation method of transmitting in claim 2,3, the 4 or 5 described virtual exchange systems, it is characterized in that described step C comprises:

7, the professional implementation method of transmitting in the virtual exchange system according to claim 6 is characterized in that described step C1 comprises:

8, the professional implementation method of transmitting of virtual exchange system according to claim 7 is characterized in that the content of described VLAN label stack comprises:

Described step C12 comprises:

9, a kind of virtual exchange system V-Switch system, comprise service control layer entity SCR, connect key-course entity VSC and bearing capacity layer entity DRE, it is characterized in that, described VSC only sets up signalling path with the DRE of network edge, need not to set up signalling path, and the business that VSC determines is transmitted the inlet DRE that the VLAN sequence label that needs is handed down to described network edge with middle DRE.

10, the system that transmits of exchange system business according to claim 9 is characterized in that, described VSC also is connected communication with adjacent VSC, is used for determining the VLAN label stack of business forwarding needs.