CN1832443A - Method for reducing VPN network arranging - Google Patents
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Abstract
This invention provides a method for simplifying the VPN network arrangement, in which, said network includes at least a source end device and a device of an opposite end, the method includes the following steps: a, after the source end device receives two layers of data frames with VLAN information, it gets the ID of VPN by the image relation list of the VLAN and the VPN, b, carrying out transfer search for the destination MAC address via ID of the VPN to get the destination CE information and packaging information of the MPLS two layers of labels, c, after the opposite end device receives the frames, it alters said packaged VLAN information and transfers it by the image relation list of the VPN ID to the VLAN.
Description
Technical field
The present invention relates to a kind of simplification VPN (Virtual Private Network, the Virtual User network) method of network deployment, relate in particular to a kind of method of the two-layer VPN network deployment based on MPLS (Multi-Protocol Label Switch, multiple label switching technology).
Background technology
Current, include VPN (VLL, the Virtual Leased Lines) technology of point-to-point based on the mainstream technology of the two-layer VPN of MPLS, and VPN (VPLS, the virtual privately owned LAN service) technology of putting multiple spot.
VLL (Virtual Leased Line, Virtual Leased Lines) technology based on MPLS is to adopt the MPLS label to realize.The Frame of customer service is at CE (Consumer Edge, customer edge) inside is with common ethernet data frame transmission, entering the PE of operator (Provider Edge, Provider Edge) behind the equipment, PE is according to user's vlan information and purpose MAC information, search the MPLS label that obtains a bilayer after transmitting, obtain the purpose MAC and the vlan information of next jumping again according to this double-deck MPLS label, send from the corresponding transmit port of this equipment the encapsulation back, is dealt into the PE equipment of opposite end.Table 1 explicit user normal data frames, table 2 shows the MPLS Frame.
| Purpose MAC | Source MAC | VLAN | Quiet lotus | CRC |
Table 1 user normal data frames
| Purpose MAC | Source MAC | VLAN | Lable?1 | Lable?2 | Purpose MAC | Source MAC | VLAN | Quiet lotus | CRC |
Table 2 MPLS Frame
The packet of this MPLS encapsulation has arrived after the PE equipment of opposite end.PE equipment removes the label of two-layer MPLS, and the vpn label of signing from this two-layer MPLS watchman's clapper obtains the final outbound port information of this VPN customer service on this equipment, and two layers of ethernet data frame that the equal brushes family VPN intactly go out physical port and send from corresponding.
If VPN user has the VPN access point more than two, so just need use following two layers of retransmission technique of VPLS VPN based on MPLS.
Under VPLS (Virtual Private LAN Service, virtual privately owned LAN service) VPN networking applicable cases based on MPLS.From the next user's vpn service of a VPN user's a CE access point, according to two layers of purpose MAC information of business, go into physical port and go into the vlan information situation, there are a plurality of purpose CE to select, that is to say that each CE leads to a plurality of CE points, can with communicate more than the main frame under a plurality of VPN users under the CE point.Table 3 explicit user normal data frames, table 4 shows the MPLS Frame.
| Purpose MAC | Source MAC | VLAN | Quiet lotus | CRC |
Table 3 user normal data frames
| Purpose MAC | Source MAC | VLAN | Lable?1 | Lable?2 | Purpose MAC | Source MAC | VLAN | Quiet lotus | CRC |
Table 4 MPLS Frame
Frame packing forms from forwarding plane, it is the same process that point encapsulates with the VLL VPN of point-to-point to the VPLS VPN of multiple spot, that is to say that at PE equipment place, source two layers of ethernet data frame will coming in encapsulate the purpose PE equipment that mails to the opposite end behind the two-layer MPLS label.Purpose PE equipment receives after the user VPN Frame of the two-layer label of encapsulation MPLS, two-layer MPLS label peeling is fallen, and according to the information that the MPLS label carries, obtain the target physical port information, sends from corresponding physical port.
In superincumbent two kinds of two-layer VPN implementations based on MPLS, user's two layers of Ethernet information and vlan information all are can not be reformed in whole repeating process, because these information all are VPN user's information, as provider that vpn service is provided or operator, the communication pipe of two layers of connection should be just be responsible for providing, and any information of user can not be changed.This is the original intention and the purpose of MPLS two-layer VPN solution.
But in actual networking is used, two layers of vlan information under some environment are that two-layer VPN service provider or operator self add, operator or provide physical port to use to VPN user, or on the existing vlan information of user, add one deck vlan information again, it is more and more and more and more general to be that operator can control the application scenario of one deck or two-layer vlan information authority in a word, in this case, still all vlan informations all being used as is that VPN user's information is treated and handled, and will bring not convenient in a lot of unreasonable and VPN deployment in application.
Summary of the invention
The present invention seeks to solve the problem that in existing VPN network design, exists, by with the relevant together consideration of MPLS label and vlan information, realize simplifying arrangement, thereby in the VPN networking is used and disposed, bring more convenience and flexibility based on MPLS two-layer VPN network.
For this reason, the invention provides a kind of method of the VPN of simplification network design, operate on the existing two-layer VPN wide area network basis based on MPLS, described network comprises at least one source end PE (office side) equipment and pair of end PE (office side) equipment, and this method comprises the steps:
(a), after source end PE equipment receives the Layer 2 data frame that has vlan information,, obtain the ID of VPN by the mapping relations table of VLAN and VPN;
(b), carry out the forwarding lookup of target MAC (Media Access Control) address, obtain the information of purpose CE and the information of the two-layer label of encapsulation MPLS by the ID of VPN;
(c) after PE equipment in opposite end is received Layer 2 data frame after the encapsulation,, change the vlan information of described encapsulation and transmit by the VPN ID that is provided with mapping relations table to VLAN.
Wherein, in described step (b), need further the Layer 2 data frame to be carried out the encapsulation of the two-layer label of MPLS; When the Layer 2 data frame encapsulates, can carry different identifying informations according to concrete transmission environment difference; According to concrete transmission environment difference, the identifying information that described two layers of ethernet data frame carry can be original vlan information, or the information of VPN ID, also can be not with any vlan information.
Wherein, in step (c), before the vlan information of change encapsulation, described opposite end PE equipment also needs to obtain the VPN id information of Layer 2 data from the MPLS label.
In addition, in step (c), before the vlan information of change encapsulation, described opposite end PE equipment also need use VPN ID to add the target MAC (Media Access Control) address information searching and obtain forwarding target physical port on the PE equipment of opposite end.
In addition, in step (c), opposite end PE equipment is according to described physical port information, searches the VPN ID that obtains under this physical port mapping table to VLAN, the vlan information of required encapsulation when obtaining exporting this port, and send from the respective physical port encapsulation back.
In addition, described packed two layers of ethernet data frame with vlan information can be one deck or two-layer.
In addition, in step (a), described source end PE equipment also need use VPN ID to carry out the study of source MAC, and corresponding M AC address learning is belonged to this VPN user's corresponding port under the end PE equipment of this source; In step (c) afterwards, described opposite end PE equipment further according to the source-information of VPN id information and MPLS sign switching path, is learnt corresponding source MAC under the far-end CE of corresponding correspondence.
Compare with existing technical scheme, the present invention is by adding the mapping relations of VLAN and VPN ID in the end PE equipment of source, and in the PE equipment of opposite end, resolve accordingly and this mapping relations of corresponding change, increased the control of operator to vlan information in two layers of ethernet data frame, thereby realization office side is the needed vpn service kind of configuration separately, do not need the opposing party's (user) cooperation to finish, thus make the deployment of VPN easier, flexible.
Description of drawings
Fig. 1 is the schematic diagram of the applied typical environment of method of simplification VPN network design provided by the invention.
Fig. 2 is the flow chart that the present invention simplifies the method for VPN network design.
Embodiment
Core concept of the present invention is the mapping relations table by configuration VLAN and VPN ID in source end PE equipment and opposite end PE equipment, by VPN ID is intermediary, make when transferring data frames, the VLAN id information of source end and opposite end can be different, and then realize that operator is more flexible, easy to the arrangement of VPN network.The present invention is described further below in conjunction with accompanying drawing.
Networking applied environment provided by the invention is the same with traditional VPN network based on existing MPLS, but more flexible on the VPN network deployment, easy.As shown in Figure 1, shown that in Fig. 1 enterprise customer A and B serve three branch's local area network (LAN)s that connect separately by VPLS respectively.
In such two-layer VPN network design based on MPLS, sometimes need to use the VLAN of localization to judge VPN user, such as certain VLAN (numerical value of these two VLAN is different) that is placed on below certain port of certain VLAN and certain equipment that is placed on the another one machine room below certain port of certain equipment of certain machine room of user A belongs to a VPN user, their two layer services need be carried out intercommunication.Communicating by letter between machine room and the machine room need be by the MPLS network of operator, and this kind networking is used and is supported multi-multipoint application model, that is to say, a VPN user has a plurality of Service Access points, from the business data frame that each Service Access point is come in, all might carry out intercommunication with purpose access point greater than two.
In said circumstances, as shown in table 5 from VPN user's Layer 2 data frame format that source PE equipment is come in; VPN user's Layer 2 data frame format in PE equipment exit, opposite end is as shown in table 6; Or two kinds of Layer 2 data frame formats that have two-layer VLAN label shown in table 7, table 8.Table 7 is VPN user's Layer 2 data frame formats that PE equipment is come in; Table 8 is VPN user's Layer 2 data frame formats in purpose PE equipment exit.
| Purpose MAC | Source MAC | VLAN1 | Quiet lotus | CRC |
VPN user's Layer 2 data frame format that table 5 source PE equipment is come in
| Purpose MAC | Source MAC | VLAN2 | Quiet lotus | CRC |
VPN user's Layer 2 data frame format in table 6 purpose PE equipment exit
| Purpose MAC | Source MAC | VLAN1 | VLAN2 | Quiet lotus | CRC |
VPN user's Layer 2 data frame format that table 7 source PE equipment is come in
| Purpose MAC | Source MAC | VLAN3 | VLAN4 | Quiet lotus | CRC |
VPN user's Layer 2 data frame format in table 8 purpose PE equipment exit
Entering the original Layer 2 data frame based on the two-layer VPN network provider of MPLS, according to concrete message transmissions mode difference, may be to have one deck VLAN label, also may be to have two-layer VLAN label, also may be not to be with the VLAN label.Under situation not with the VLAN label, Ethernet switch can add a default VLAN information according to going into the Layer 2 data frame that physical port information automatically gives into, does not therefore all consider according to one deck VLAN label in the original Layer 2 data frame statement afterwards with vlan information.
Complete skill scheme of the present invention comprises the situation of one deck VLAN label and two (many) layer VLAN label.Situation with one deck VLAN label is that example describes below.
In the Layer 2 data frame format that Layer 2 data frame that the source PE equipment of expressing from top table receives and opposite end PE equipment send as can be seen, if have the original Layer 2 data frame of one deck VLAN label, the VLAN label numerical value that comes out later on by MPLS two-layer VPN service provider network is with original different so, though former and later two VLAN labels all are the business under the same VPN user of sign, and should implication the same, equally treat.But it is different in form in concrete VLAN numerical value performance.
It also is example with Fig. 1, from in logic, the VLAN1 of source PE1 is that user A branch local area network (LAN) 1 (or below certain physics port VLAN1) is corresponding to VPN user A, VLAN2 below the purpose PE2 is that user A branch local area network (LAN) 2 (or the VLAN2 below certain physics port) is also corresponding to VPN user A, VLAN3 below the purpose PE4 is that user A branch local area network (LAN) 3 (or the VLAN3 below certain physics port) is also corresponding to VPN user A, in whole carrier network inside, the different VLAN of ordering from three different PE form the VPN ID1 of user A, all nodes in this VPN lead to based on the double layered communication of two layers of ethernet data frame, and two layer MAC address can be learnt and wear out automatically, just transmits as common Layer 2 data.That is to say, MAC Address under each node all adds the form study of inbound port under corresponding physical port with VPN ID1, when Layer 2 data frame business mail to concrete physical port, VPNID1 was replaced by the corresponding VLAN form of expression of the VPN ID1 under the respective physical port.
As Fig. 1 and in conjunction with shown in Figure 2, with VPN user A below PE1 VLAN1 and the VLAN3 business intercommunication process below the PE4 be example, it is as follows specifically to transmit the principle procedure declaration:
(1), PE1 equipment receives after the Layer 2 data frame that has VLAN1, uses the mapping relations table of VLAN1 to VPN ID1, obtains VPN ID1.
(2), use VPN ID1 to carry out the forwarding lookup of target MAC (Media Access Control) address, obtain purpose CE information, and the information of the two-layer label of encapsulation MPLS.
(3), user's Layer 2 data frame is encapsulated in the MPLS label, mail to purpose PE4.In encapsulation Layer 2 data frame, because the particular hardware environment difference in the network, the vlan information data bit in two layers of ethernet data frame can be one deck, two layers or not have that therefore corresponding encapsulation process just may have following several encapsulation variation:
Original VLAN1 information on A, the packed Layer 2 data frame band.
The information of VPN ID1 on B, the packed Layer 2 data frame band.
C, packed Layer 2 data frame are not with VLAN1 or VPN ID1 information, and promptly original VLAN position or an empty VLAN numerical value (being complete zero) perhaps do not have vlan information at all, promptly are encapsulated as the form of not being with vlan information.
(4), use VPN ID1 to carry out the study of source MAC, MAC address learning is belonged to this VPN user's corresponding port under the corresponding PE.
(5), the Layer 2 data frame of MPLS encapsulation arrived after the PE4 equipment of opposite end, obtains user's Layer 2 data frame from the MPLS label.
(6), when from the Frame of MPLS encapsulation, obtaining VPN user's Layer 2 data frame, the most important thing is to obtain the information of VPN ID1, this VPN ID1 informational needs obtains from the MPLS label.
(7), using VPN ID1 to add target MAC (Media Access Control) address information searches, obtains the forwarding target physical port of this PE4.
(8), according to going out physical port information, remove to search VPN ID1 and the mapping table of VLAN under this physical port, the vlan information of required encapsulation when obtaining exporting this port, encapsulation is then sent from the respective physical port.
(9), according to the source-information in VPN ID1 information and MPLS virtual switch path, the MAC address learning of destination interface under corresponding far-end CE, is promptly corresponded to the CE of the transmission ethernet data frame that source PE1 equipment connects.
In addition, in the superincumbent repeating process, the forwarding from source PE1 to purpose PE4, owing to pass in the MPLS label with VPN user's Layer 2 data frame of two-layer MPLS label encapsulation of carrier network and carried VLAN and VPN id information, so the inner corresponding entrained information of vlan information data bit of Layer 2 data frame can be very flexible, such as can be with original vlan information, can not be with yet, also can be with the VPN id information, therefore concrete disposition and means are diversified, divide several situations to consider below.
(1), band VPN id information or be not with vlan information
Because the VPN id information carries in the MPLS label, so this information can not carried in vlan information yet.Whether carry, be associated with the specific implementation that hardware is transmitted ASIC sometimes.Because some hardware is transmitted asic chip to the situation processing with vlan information is more not smooth and easy, if vlan information is not carried in Layer 2 data frame inside, at this moment wait, it is just fairly simple that the chip of opposite end is handled action, and it is just passable only need newly to insert one deck VLAN label.
(2), band original vlan information
If the original vlan information band is crossed carrier network, the information of carrying so just can be more more.Because at this time, user VPN id information is carried in the MPLS label, therefore some other information can be carried among the VLAN.Such as if also have a plurality of VLAN below a CE, MPLS carries the VPN id information so, and the different vlan informations below the CE just can be carried in the position of VLAN label.
That is to say that the band vlan information can provide the application demand that a plurality of VLAN are arranged below the VPN user by carrier network, and these a plurality of VLAN there is the different forms of expression at different CE points.
Therefore; though in the specific embodiment that the present invention narrated; opposite end PE obtains the VPN id information and then further obtains native vlan information from the MPLS label; but; its concrete implementation can be various; can not utilize VPN id information or the vlan information that carries in two layers of ethernet data frame MPLS label such as opposite end PE equipment; but carry VPN id information or vlan information in other parts of two layers of ethernet data frame; and utilize these information to realize the localization conversion of vlan information; therefore; it goes without saying that these conversion and using within the scope all be included in claim protection of the present invention.
Certainly, in multi-multipoint application, because the vlan information of a plurality of points may have nothing in common with each other, and the principle of two layers of forwarding is to need the ability intercommunication in a VLAN of a plurality of MAC Address.Therefore, with the vlan information of MPLS network preferably represent VPNID, rather than the localization vlan information of each point is because this can cause the MAC address learning problem of point of destination.If the band past is the information of localization, so just needs equipment itself can handle this situation, such as carry out the study and the forwarding of two-layer VPN after the vlan information processing that will localize.
As has already been mentioned above, the processing of the situation of two-layer VLAN label is as one deck VLAN label condition, and this two-layer VLAN label all is an implication of having only local localization.That is to say only special fixed numbers is arranged on certain access point, and arrived the another one access point, this two-layer label of sign VPN user or customer service all needs to be replaced by the numerical value of other two-layer VLAN label.
In sum, the present invention is by adding the mapping relations of VLAN and VPN ID in the end PE equipment of source, and resolve this mapping relations accordingly in the PE equipment of opposite end, increased the control of operator to vlan information in two layers of ethernet data frame, realized and to have disposed needed vpn service kind separately by a side (office side), do not need the opposing party's (user) cooperation to finish, thus make the deployment of VPN easier, flexible.
Claims (10)
1, a kind of method of reducing VPN network arranging, operate on the existing two-layer VPN wide area network basis based on MPLS, described network comprises at least one source end PE (office side) equipment and pair of end PE (office side) equipment, it is characterized in that this method comprises the steps:
(a), after source end PE equipment receives the Layer 2 data frame that has vlan information,, obtain the ID of VPN by the mapping relations table of VLAN and VPN;
(b), carry out the forwarding lookup of target MAC (Media Access Control) address, obtain the information of purpose CE and the information of the two-layer label of encapsulation MPLS by the ID of VPN;
(c), after opposite end PE equipment receives Layer 2 data frame after the encapsulation,, change the vlan information of described encapsulation and transmit by the VPN ID that is provided with mapping relations table to VLAN.
2, the method for reducing VPN network arranging as claimed in claim 1 is characterized in that, in described step (b), needs further the Layer 2 data frame to be carried out the encapsulation of the two-layer label of MPLS.
3, the method for reducing VPN network arranging as claimed in claim 2 is characterized in that, when the Layer 2 data frame encapsulates, can carry different identifying informations according to concrete transmission environment difference.
4, the method for reducing VPN network arranging as claimed in claim 3, it is characterized in that according to concrete transmission environment difference, the identifying information that described two layers of ethernet data frame carry can be original vlan information, or the information of VPN ID, also can be not with any vlan information.
5, the method for reducing VPN network arranging as claimed in claim 1 is characterized in that: in step (c), before the vlan information of change encapsulation, described opposite end PE equipment also needs to obtain the VPN id information of Layer 2 data from the MPLS label.
6, the method for reducing VPN network arranging as claimed in claim 5, it is characterized in that: in step (c), before the vlan information of change encapsulation, described opposite end PE equipment also need use VPN ID to add the target MAC (Media Access Control) address information searching and obtain forwarding target physical port on the PE equipment of opposite end.
7, the method for reducing VPN network arranging as claimed in claim 6, it is characterized in that: in step (c), opposite end PE equipment is according to described physical port information, search the VPN ID that obtains under this physical port mapping table to VLAN, the vlan information of required encapsulation when obtaining exporting this port, send from the respective physical port encapsulation back.
8, the method for reducing VPN network arranging as claimed in claim 1 is characterized in that, described packed two layers of ethernet data frame with vlan information can be one deck or two-layer.
9, the method for reducing VPN network arranging as claimed in claim 1, it is characterized in that, in step (a), described source end PE equipment also need use VPN ID to carry out the study of source MAC, and corresponding M AC address learning is belonged to this VPN user's corresponding port under the end PE equipment of this source.
10, the method for reducing VPN network arranging as claimed in claim 1, it is characterized in that, in step (c) afterwards, described opposite end PE equipment further according to the source-information of VPN id information and MPLS sign switching path, is learnt corresponding source MAC under the far-end CE of corresponding correspondence.
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| CNB2005100513520A CN100428737C (en) | 2005-03-08 | 2005-03-08 | Method for reducing VPN network arranging |
| PCT/CN2005/002067 WO2006094440A1 (en) | 2005-03-08 | 2005-12-01 | A method of virtual local area network exchange and the network device thereof |
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| CNB2005100513520A CN100428737C (en) | 2005-03-08 | 2005-03-08 | Method for reducing VPN network arranging |
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| CN105991436A (en) * | 2015-02-12 | 2016-10-05 | 中兴通讯股份有限公司 | Method and device for transmitting and processing end-to-end service |
| CN105991436B (en) * | 2015-02-12 | 2020-02-07 | 中兴通讯股份有限公司 | Transmission processing method and device for end-to-end service |
| CN106330499A (en) * | 2015-06-25 | 2017-01-11 | 中兴通讯股份有限公司 | Time division multiplexing data transmission method and device, as well as network-side edge devices |
| CN114339494A (en) * | 2022-01-05 | 2022-04-12 | 烽火通信科技股份有限公司 | Method and device for accessing VLAN aggregation service to MPLS in PON |
| CN114339494B (en) * | 2022-01-05 | 2023-05-26 | 烽火通信科技股份有限公司 | Method and device for accessing Vlan aggregation service into MPLS in PON |
| CN115396336A (en) * | 2022-08-01 | 2022-11-25 | 南京网元通信技术有限公司 | MPLS VPN (Multi-protocol Label switching virtual private network) passenger gathering special line active test method based on software simulation |
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