CN101719857B - Asymmetric PW-based VPLS network access method and asymmetric PW-based VPLS network access system - Google Patents
Asymmetric PW-based VPLS network access method and asymmetric PW-based VPLS network access system Download PDFInfo
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Abstract
The invention provides an asymmetric PW-based VPLS network access method and an asymmetric PW-based VPLS network access system. The method comprises that: in an instance of establishing a VPWS on an MTU, the MTU establishes a pseudo wire PW with PE, simultaneously configures an asymmetry attribute on the PW, establishes the PW of a standard Tag mode with the PE through signaling and informs a forwarding layer of the PW of a standard Raw mode; a Vlan Tag in a message transmitted by a CE is passed through the PW as a user message; and the PE determines the Vlan Tag as the Tag specified by an operator and performs MAC learning and forwarding under a qualified mode. The method and the system can improve user message forwarding efficiency and greatly reduce PW resource consumption between the MTU equipment and the PE equipment.
Description
Technical field
The present invention relates to network communication field, particularly a kind of VPLS method for network access and system based on asymmetric PW.
Background technology
(Virtual Private Lan Service VPLS), is a kind of point of in common network, providing two-layer VPN business to multiple spot for virtual special local area network service.
VPLS is that End-Customer provides the ether service through being modeled to a virtual Layer 2 switch to the IP kernel heart net of operator.Operator has passed through to dispose these service guarantees separation in the connectedness of the same client of different regions and the isolation between the different user.
Operator plans and disposes the VPLS network according to client and the demand of self, and the VPLS network of deployment is transparent for the client of operator.The networking of a typical VPLS network is as shown in Figure 1.Wherein, Operator disposes VPLS in its core network: set up connection through Hub PW between backbone network edge router PE1, PE2 and the PE3; Constitute a full VPLS network that connects (Full-Mesh), transmit and avoid loop through carrying out message between the restriction Hub PW.Introducing level is simultaneously cut apart (H-VPLS) technology and is solved pseudo-line (Pseudo-Wire connects the expense of the LDP session that brings and the waste of resource PW) entirely.General operator can be between PE and user network edge router (CE), provides to rent the unit more one (Multi-Tenant Unit MTU) offers CE as user's access network and inserts.
The MTU of operator can be divided into MTU that possesses bridge joint (bridge) ability and the MTU that does not possess bridging capability.The mode that operator uses the MTU of these two kinds of different abilities to carry out the access network deployment is different, and the pass-through mode of customer flow also is different then.Networking with Fig. 2 is an example, for the MTU with bridging capability, only needs to create a VPLS instance, be linked into CE1 and CE2 in this VPLS instance, simultaneously only need and PE1 between set up a PW and get final product.The consumption of its resource can be expressed as (C AC interface+1 PW), and wherein C representes the CE number that this MTU inserts.Because this MTU has bridging capability, the exchange of the local data between CE1 and the CE2 then can be accomplished local the forwarding through MTU and need not to send PE1 so.
Another kind is the MTU with bridging capability.In this case, for the CE of each access, MTU need set up a VPWS instance respectively, and through binding the AC between MTU and the CE, the PW that between MTU and PE, creates point-to-point simultaneously accomplishes the forwarding of CE to PE.The consumption of its resource can be expressed as (C AC interface+C PW), and wherein C representes the CE number that this MTU inserts.Because this MTU does not possess bridging capability, the local flow of CE1 and CE2 also need exchange on PE1.
Operator is when disposing VPLS for the user; According to user's the demand and the needs of operator self; Can be for VPLS dispose two kinds of different mac learning modes, a kind of is the VPLS mac learning mode of unqualified pattern, a kind of is the VPLS mac learning mode of qualified pattern.Certain VPLS instance under the unqualified pattern only carries out mac learning according to the source MAC of user's Ethernet message, therefore, has only a MAC Address space in the VPLS instance of this pattern; And certain the VPLS instance under the qualified pattern can be learnt according to the source MAC of user's Ethernet message and the VLAN Tag of user's message, thereby in the VPLS instance of this pattern, all has independently MAC Address space between user's the VLAN.
Operator can dispose the VPLS network with different qualities according to user's different demands in the networking of reality.For example, if the user has a plurality of C-VLAN (the inner VLAN of user) needs to connect through " service provider " and needs each C-VLAN to have independently MAC Address space (being called demand 1).Operator can solve this problem through the VPLS that disposes the qualified pattern so, thereby has avoided all setting up the huge resource consumption that a VPLS instance brings for each user's C-VLAN.For example; Under some application scenarios; Only need carry out far-end communication between client's the CE, that is to say that need on MTU, not carry out this locality transmits, only needs through the IP/MPLS core net of operator the CE (call demand 2) of the message transmission of local CE to far-end.MTU in this case has typical P2P (Point to Point) character and does not need local bridge joint function of exchange.Therefore, on MTU, can accomplish the access of CE through creating the VPWS instance.This access way can be called VPWS and insert VPLS, and it had both simplified the logical topology of network, has brought into play the odds for effectiveness of P2P exchange again.
For satisfy the demands simultaneously 1 with the situation of demand 2, operator will all create a VPWS instance for each VLAN of user and accomplish the access to core net.Its sketch map is as shown in Figure 2.
The message of certain VLAN of CE is linked into MTU through the logic interfacing between one and the MTU; MTU finds that this interface belongs to a VPWS instance, and is the PW of the TAG pattern of deployment, at this moment; The VLAN ID that carries in the user's message is sent to PE as TAG through PW; PE at first arrives the VPLS instance through the PW tag location, and source MAC and the TAG mark according to message carries out mac learning then, realizes the isolation to the different VLAN of same user.
Specifically comprise the following steps: 1, n the VLAN that supposed user's internal separation, the maximum of n is 4094; 2, CE can be that real interface also can be a plurality of sub-interfaces under certain real interface to the access of MTU, and MTU need specify an interface for each VLAN; 3, MTU is for need creating n VPWS instance, and each VPWS instance is bound the interface of a CE access, and and PE1 between set up the PW of a Tag pattern, need set up n PW altogether; 4, for the user's message that comes from each PW, PE at first arrives affiliated VPLS instance through the PW tag location, and source MAC and the Vlan Tag according to user's message carries out the study of MAC Address then, realizes the isolation to the different VLAN of same user.
But the defective of said method is: for each VLAN of user, MTU all need and PE between create a PW, realize of the isolation of the message of the different VLAN of CE in the Full-Mesh territory.Under the limiting case, when the user had disposed 4094 VLAN, MTU just need be for setting up 4094 PW between this user and the PE, and this will bring the consumption of great PW resource and the decline of systematic function.
Summary of the invention
The objective of the invention is to, a kind of VPLS method for network access based on asymmetric PW is provided, can improve the forward efficiency of user's message, significantly reduced the PW resource consumption between MTU and the PE.
Another object of the present invention is to, a kind of VPLS network access system based on asymmetric PW is provided, can improve the forward efficiency of user's message, significantly reduced the PW resource consumption between MTU and the PE.
VPLS method for network access based on asymmetric PW of the present invention comprises the following steps:
Step C: on renting unit MTU, create in the professional VPWS instance of VLL more; And pseudo-line PW of establishment between the PE; Simultaneously on PW, dispose asymmetry attribute, PW and the MTU of Tag pattern that sets up standard through signaling between MTU and the PE is the PW of the Raw pattern of standard to the forwarding plane announcement; Wherein, the PW of the Tag pattern of standard is meant that the PW type of carrying in the command negotiation process between MTU and the PE is the Tag pattern, and between signaling aspect MTU and PE, consults to be the Tag pattern; To forwarding plane announcement be that the PW of the Raw pattern of standard is meant, when the signaling aspect consulted that successfully the back is to the relevant forwarding of forwarding plane announcement PW attribute, according to said configuration, the forwarding attribute of the PW that announces to forwarding plane was the Raw pattern;
Step D: the Vlan Tag in the message that user network edge router CE sends is as user's message transparent transmission on PW;
Step e: PE judges that said Vlan Tag is preassigned Tag, and carries out mac learning and forwarding under the qualified pattern.
Wherein, before step C, also comprise:
Steps A: CE converges a plurality of VLAN of client and inserts MTU;
Step B: on MTU, create the VPWS instance, the AC interface of specifying this VPWS instance is said CE and the direct-connected interface of MTU.
Wherein, in said step C, the configuration asymmetry attribute does on PW, and an optional parameters is specified in the configuration order of the VPWS of MTU, or a sepaerate order that is under the jurisdiction of under the VPWS configuration mode of MTU is specified.
VPLS network access system based on asymmetric PW of the present invention; Comprise: MTU, PE, CE, wherein, said MTU; Be used for creating the VPWS instance; And create a PW between the PE, and on PW, disposing asymmetry attribute simultaneously, PW and the MTU of Tag pattern that sets up standard through signaling between MTU and the PE is the PW of the Raw pattern of standard to the forwarding plane announcement; And the Vlan Tag of the message that is used for CE is sent is as user's message transparent transmission on PW; Wherein, the PW of the Tag pattern of standard is meant that the PW type of carrying in the command negotiation process between MTU and the PE is the Tag pattern, and between signaling aspect MTU and PE, consults to be the Tag pattern; To forwarding plane announcement be that the PW of the Raw pattern of standard is meant, when the signaling aspect consulted that successfully the back is to the relevant forwarding of forwarding plane announcement PW attribute, according to said configuration, the forwarding attribute of the PW that announces to forwarding plane was the Raw pattern; Said PE is used to think that said Vlan Tag is the Tag of operator's appointment, and carries out mac learning and forwarding under the qualified pattern.
Wherein, said CE also is used to converge a plurality of VLAN of client and insert MTU; Said MTU also is used for creating the VPWS instance above that, and the AC interface of specifying this VPWS instance is said CE and the direct-connected interface of MTU.
Wherein, said MTU disposes asymmetry attribute and does on PW, and an optional parameters is specified in the configuration order of the VPWS of MTU, or a sepaerate order that is under the jurisdiction of under the VPWS configuration mode of MTU is specified.
The invention has the beneficial effects as follows: according to VPLS method for network access and system based on asymmetric PW of the present invention; Insert the method for the VPLS instance of qualified pattern through VPWS; Can on MTU, use the P2P exchange; Thereby exempted requirement, replaced bridge to transmit the forward efficiency that has improved user's message through the P2P exchange simultaneously the bridge transfer capability of MTU; And adopt method of the present invention, can further make PW between MTU and the PE consume and be reduced to one of every user, rather than one of every VLAN of every user.The VLAN of the different user that inserts for same CE, MTU only need set up the demand that a VPWS instance just can satisfy the VPLS of traditional VPWS access qualified pattern, thereby has significantly reduced the PW resource consumption between MTU and the PE.
Description of drawings
Fig. 1 is the networking sketch map of typical VPLS network;
Fig. 2 inserts the sketch map of qualified pattern VPLS network for the existing MTU that does not possess the bridge ability;
Fig. 3 is the flow chart that inserts typical VPLS network based on asymmetric PW technology of the present invention;
Fig. 4 is the sketch map that inserts qualified pattern VPLS network based on asymmetric PW technology MTU of the present invention.
Embodiment
Below, describe VPLS method for network access and system based on asymmetric PW of the present invention in detail with reference to accompanying drawing 1～4.
Core concept of the present invention is: at first at the PW of the Tag pattern of the signaling aspect standard of consulting into of two equipment setting up PW; Set the asymmetry attribute of the PW of an end through a configuration order; Will think the Raw pattern of standard like this at forwarding plane one end, and the other end is still thought the Tag pattern of standard.Through such setting, user's VLAN will carry out transparent transmission as user's message at an end of Raw pattern.
As shown in Figure 3, the VPLS method for network access based on asymmetric PW of the present invention comprises the following steps:
Step 100:CE converges a plurality of VLAN of client and inserts MTU; The physical interface that wherein, can be linked into MTU also can be the physics sub-interface of MTU.
Step 200: on MTU, create the professional VPWS instance of VLL, specifying the AC interface of this VPWS instance is this CE and the direct-connected interface of MTU;
Step 300: on MTU, create in the VPWS instance; And PW of establishment between the PE; Simultaneously on PW, dispose asymmetry attribute, make between MTU and the PE that PW and the MTU of Tag pattern that sets up standard through signaling is the PW of the Raw pattern of standard to the forwarding plane announcement;
Vlan Tag in the message that step 400:CE sends is as user's message transparent transmission on PW;
Think on the step 500:PE and carry out mac learning and forwarding under the qualified pattern by the Tag that this Vlan Tag is operator's appointment.
Wherein, the asymmetry attribute of this PW of configuration in step 300 can be that an optional parameters is specified in the configuration order of VPWS of MTU, also can be that a sepaerate order that is under the jurisdiction of under the VPWS configuration mode of MTU is specified.
In addition, the PW of the Tag pattern of the standard in the step 300 is meant that the PW type of carrying in the command negotiation process between MTU and the PE is Tag (being also referred to as Ethernet-Vlan), and between signaling aspect MTU and PE, consults to be the Tag pattern.
Forwarding plane in the step 300 is the PW of Raw pattern, be meant the signaling aspect consult successfully the back to forwarding plane announcement PW is relevant transmit attribute in, according to the configuration in the step 200, be the Raw pattern to the forwarding attribute of the PW of forwarding plane announcement.
Particularly, operator need carry out the deployment of VPLS according to the networking among Fig. 4 before the flow of acceptance and transmission user, comprise the PW of the Hub type of setting up full connection between the PE.With PE1 is the PW that need set up the Hub type between example: PE1 and PE2, PE1 and the PE3, also sets up the PW of a Tag type between needs and the MTU simultaneously, and has the spoke attribute.
On access equipment of operators MTU, create a VPWS instance, AC interface is wherein specified the interface that is connected with CE, simultaneously will and PE between be standard Tag pattern in the signaling aspect, and be the PW of standard Raw pattern at the forwarding plane of MTU.The command configuration module of MTU need dispose this PW accordingly, has asymmetry attribute so that this PW to be set.Provide a kind of possible order line collocation form below, carry out exemplary illustration:
PE1(config)#interface?fei_1/1
PE1(config-if)#xconnect?1.1.1.110023eth-vlan?asymmetry
Through specifying asymmetry attribute for the PW among this VPWS; Then the signaling aspect is according to after the Tag mode negotiation success; Supporting module (adaptation module in the middle of control aspect and the forwarding plane) need be done an adapting operation, is handed down to PW according to the Raw pattern forwarding plane of MTU.
VPLS network access system based on asymmetric PW of the present invention comprises CE, MTU, PE, and wherein, CE is used to converge a plurality of VLAN of client and insert MTU; MTU is used for creating the VPWS instance above that, and the AC interface of specifying this VPWS instance is said CE and the direct-connected interface of MTU; And, be used for creating the VPWS instance, and create a PW between the PE, on PW, dispose asymmetry attribute simultaneously, PW and the MTU of Tag pattern that sets up standard through signaling between MTU and the PE is the PW of the Raw pattern of standard to the forwarding plane announcement; And the Vlan Tag of the message that is used for CE is sent is as user's message transparent transmission on PW; PE is used to think that said Vlan Tag is the Tag of operator's appointment, and carries out mac learning and forwarding under the qualified pattern.
Wherein, MTU disposes asymmetry attribute and does on PW, and an optional parameters is specified in the configuration order of the VPWS of MTU, or a sepaerate order that is under the jurisdiction of under the VPWS configuration mode of MTU is specified.
In addition, the PW of the Tag pattern of standard is meant that the PW type of carrying in the command negotiation process between MTU and the PE is the Tag pattern, and between signaling aspect MTU and PE, consults to be the Tag pattern; Forwarding plane is that the PW of Raw pattern is meant, consults successfully the back to forwarding plane announcement PW is relevant when transmitting attribute in the signaling aspect, according to the configuration among the said step C, is the Raw pattern to the forwarding attribute of the PW of forwarding plane announcement.
Be example with the networking among Fig. 4 below, the process of the forwarding of user's message done further describing:
At first, between MTU1 and PE1, set up PW, dispose the asymmetry attribute of this PW simultaneously; The layoutprocedure of other VPLS is the VPLS configuration of standard and sets up process, repeats no more here.
Sending two layer message with CE1 to CE2 is example, on CE1, has carried the inner VLAN ID of this user in user's the message and has also arrived MTU1 through the AC link between MTU1 and the CE1.
MTU1 finds that at forwarding plane this message belongs to the VPWS message and the PW that belongs among the VPWS is the Raw pattern, then user's VLAN ID is not done any operation, stamps the PW label and the outer layer tunnel label sends to PE1.
After user's message arrives PE1; At first arrive affiliated VPLS instance according to the PW tag location; Find that this locality is the VPLS of qualified pattern this moment; And the transmission property of this PW is the Tag pattern, and then PE1 carries out the forwarding in Full-Mesh PW territory of study and the follow-up standard of MAC Address according to the VLAN ID that carries in the user's message and source MAC.
When user's message arrives PE2 via Full-Mesh PW territory; PE2 thinks that the PW that sets up between PE2 and the MTU2 is the Tag pattern; These 1000 VLAN are thought P-TAG; Different P-TAG belongs to different P-VLAN, and carries out the VPLS Mac address learning of qualified pattern, sends to MTU2 to this user's message via the PW that sets up between PE2 and the MTU2 then.
When user's message arrived MTU2, MTU2 found that at forwarding plane this PW is the Raw attribute, therefore directly user's message was carried out transparent transmission and sent to CE2 via the AC interface fei_1/2 of this VPWS.
CE2 is similar to the process that CE2 sends two layer message to process and CE1 that CE1 sends two layer message.
Through said process, accomplished the communication of two layer message between CE1 and the CE2, and the message of CE user's different VLAN is isolated.
In sum; According to VPLS method for network access and system based on asymmetric PW of the present invention; Insert the method for the VPLS instance of qualified pattern through VPWS; Can on MTU, use the P2P exchange, thereby exempt requirement, replace bridge to transmit the forward efficiency that has improved user's message through the P2P exchange simultaneously the bridge transfer capability of MTU; And adopt method of the present invention, can further make PW between MTU and the PE consume and be reduced to one of every user, rather than one of every VLAN of every user.The VLAN of the different user that inserts for same CE, MTU only need set up the demand that a VPWS instance just can satisfy the VPLS of traditional VPWS access qualified pattern, thereby has significantly reduced the PW resource consumption between MTU and the PE.
More than be in order to make those of ordinary skills understand the present invention; And to detailed description that the present invention carried out; But can expect; In the scope that does not break away from claim of the present invention and contained, can also make other variation and modification, these variations and revising all in protection scope of the present invention.
Claims (6)
1. the virtual special local area network service VPLS method for network access based on asymmetric pseudo-line PW is characterized in that, comprises the following steps:
Step C: on renting unit MTU, create in the professional VPWS instance of VLL more; And pseudo-line PW of establishment between the backbone network edge router PE; Simultaneously on PW, dispose asymmetry attribute, PW and the MTU of Tag pattern that sets up standard through signaling between MTU and the PE is the PW of the Raw pattern of standard to the forwarding plane announcement; Wherein, the PW of the Tag pattern of standard is meant that the PW type of carrying in the command negotiation process between MTU and the PE is the Tag pattern, and between signaling aspect MTU and PE, consults to be the Tag pattern; To forwarding plane announcement be that the PW of the Raw pattern of standard is meant, when the signaling aspect consulted that successfully the back is to the relevant forwarding of forwarding plane announcement PW attribute, according to said configuration, the forwarding attribute of the PW that announces to forwarding plane was the Raw pattern;
Step D: the Vlan Tag in the message that user network edge router CE sends is as user's message transparent transmission on PW;
Step e: PE judges that said Vlan Tag is preassigned Tag, and carries out mac learning and forwarding under the qualified pattern.
2. the VPLS method for network access based on asymmetric PW as claimed in claim 1 is characterized in that, before step C, also comprises:
Steps A: CE converges a plurality of VLAN of client and inserts MTU;
Step B: on MTU, create the VPWS instance, the AC interface of specifying this VPWS instance is said CE and the direct-connected interface of MTU.
3. the VPLS method for network access based on asymmetric PW as claimed in claim 1; It is characterized in that; In said step C; The configuration asymmetry attribute does on PW, and an optional parameters is specified in the configuration order of the VPWS of MTU, or a sepaerate order that is under the jurisdiction of under the VPWS configuration mode of MTU is specified.
4. VPLS network access system based on asymmetric PW comprises: MTU, PE, CE, it is characterized in that,
Said MTU is used for creating the VPWS instance, and creates a PW between the PE, on PW, disposes asymmetry attribute simultaneously, and PW and the MTU of Tag pattern that sets up standard through signaling between MTU and the PE is the PW of the Raw pattern of standard to the forwarding plane announcement; And the Vlan Tag of the message that is used for CE is sent is as user's message transparent transmission on PW; Wherein, the PW of the Tag pattern of standard is meant that the PW type of carrying in the command negotiation process between MTU and the PE is the Tag pattern, and between signaling aspect MTU and PE, consults to be the Tag pattern; To forwarding plane announcement be that the PW of the Raw pattern of standard is meant, when the signaling aspect consulted that successfully the back is to the relevant forwarding of forwarding plane announcement PW attribute, according to said configuration, the forwarding attribute of the PW that announces to forwarding plane was the Raw pattern;
Said PE is used to think that said Vlan Tag is the Tag of operator's appointment, and carries out mac learning and forwarding under the qualified pattern.
5. the VPLS network access system based on asymmetric PW as claimed in claim 4 is characterized in that,
Said CE also is used to converge a plurality of VLAN of client and insert MTU;
Said MTU also is used for creating the VPWS instance above that, and the AC interface of specifying this VPWS instance is said CE and the direct-connected interface of MTU.
6. like claim 4 or 5 described VPLS network access systems based on asymmetric PW; It is characterized in that; Said MTU disposes asymmetry attribute on PW; An optional parameters is specified in the configuration order of the VPWS of MTU, or a sepaerate order that is under the jurisdiction of under the VPWS configuration mode of MTU is specified.
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| CN101860490B (en) * | 2010-06-12 | 2015-01-28 | 中兴通讯股份有限公司 | Method for communicating packet transport network (PTN) with double-layer Ethernet and system thereof |
| CN102594644B (en) | 2011-01-11 | 2016-03-30 | 华为技术有限公司 | Select a method for the network equipment, device and system |
| CN103685022B (en) | 2012-09-17 | 2016-12-21 | 杭州华三通信技术有限公司 | Message forwarding method and service provider network edge equipment |
| CN103560940B (en) * | 2013-10-31 | 2017-01-18 | 华为技术有限公司 | Data message transmitting method and equipment |
| CN107579899B (en) * | 2017-09-29 | 2020-04-28 | 烽火通信科技股份有限公司 | Access method and device for realizing VLAN (virtual local area network) isolation in VPLS (virtual private LAN service) |
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| CN1905509A (en) * | 2006-08-03 | 2007-01-31 | 华为技术有限公司 | Method and system of user access virtual special LAN service |
| US20070086448A1 (en) * | 2005-10-17 | 2007-04-19 | Sbc Knowledge Ventures Lp | Integrated pseudo-wire and virtual routing and forwarding on a single provider edge router |
| CN101227409A (en) * | 2008-02-03 | 2008-07-23 | 华为技术有限公司 | System, equipment and method for forwarding message |
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| US20070086448A1 (en) * | 2005-10-17 | 2007-04-19 | Sbc Knowledge Ventures Lp | Integrated pseudo-wire and virtual routing and forwarding on a single provider edge router |
| CN1905509A (en) * | 2006-08-03 | 2007-01-31 | 华为技术有限公司 | Method and system of user access virtual special LAN service |
| CN101227409A (en) * | 2008-02-03 | 2008-07-23 | 华为技术有限公司 | System, equipment and method for forwarding message |
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