CN100446503C - Enhanced VPN network optimization method and apparatus - Google Patents
Enhanced VPN network optimization method and apparatus Download PDFInfo
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- CN100446503C CN100446503C CNB2005100564166A CN200510056416A CN100446503C CN 100446503 C CN100446503 C CN 100446503C CN B2005100564166 A CNB2005100564166 A CN B2005100564166A CN 200510056416 A CN200510056416 A CN 200510056416A CN 100446503 C CN100446503 C CN 100446503C
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Abstract
The present invention provides an enhanced VPN network optimization method which is used for that the VLAN of a private network passes through and is transmitted to other private networks needing to be connected from a public network. The method comprises the following steps: (1) a VLAN label on a user data frame is mapped into a VPN ID according to an inlet physical port on the inlet port of a network device; (2) the processed user data frame is forwarded in a carrier/operator network; (3) the data frame carrying the VPN ID is mapped into a data frame carrying the user VLAN label according to an outlet physical port and is forwarded on the outlet port of the network device. The present invention can realize VPNs with the number of 4K*4K. Customer service type marks in one VPN are represented by adopting a double-layer VLAN label. In addition, an exchanger with an MPLS function does not need to be adopted, and concentrated arrangement can be implemented on one device.
Description
Technical field
The present invention relates to network communications technology field, specifically, relate to the method and apparatus of a kind of enhanced VPN (Virtual Private Network, Virtual Leased Lines) network optimization.
Background technology
Local area network (LAN) on same physical aspect can be divided into a plurality of VLAN (VirtualLocal Area Network, VLAN), can not directly visit between each VLAN, can only visit, can improve the fail safe and the reliability of network like this by routing device.VPN (Virtual Private Networks, VPN) technology is a kind ofly to transmit the technology of private network by public network, can couple together the private network of different location by this technology, and be a kind of method of Cheap highly effective.Two-layer VPN technology commonly used at present has V-switch technology (VLAN switching technology, a kind of technology of using the exchange of VLAN label to transmit), QinQ technology (two-layer IEEE802.1Q label encapsulation technology, that is, wrap dozen two-layer VLAN label data, claim the 802.1Q tunneling technique again) and based on the VPN technologies of MPLS (Multi-Protocol LabelSwitch, multiple label switching technology).
Wherein, the V-switch technology is a kind of simple VPN technologies, and the basic principle of its realization is to realize by the corresponding VLAN label that one deck or two-layer VLAN label to the inbound port ethernet data frame directly are exchanged into outbound port.Specifically, after to be exactly two-layer switching equipment by the one deck that belongs to a certain specific VPN that will carry from the Frame that inbound port is come in or two-layer VLAN label change new one deck or two-layer VLAN label for another local area network (LAN) of belonging to this specific VPN together into, send from output port then, and then realize to be in each different local area network (LAN) of different regions VLAN label and form a big VPN network.
Yet adopt V-switch to realize that there is following shortcoming in VPN: (1) can only realize the VPN of point-to-point; (2) need to realize that by manual configuration the multi-hop of operator passes through, like this, when needing a plurality of equipment of passing through provider, need on each equipment, all be configured so, can not accomplish after the carrier network porch has disposed, carry out from routing forwarding; (3) the VPN customer service is not finally exchanged, that is to say MAC address learning and the MAC Address forwarding of not carrying out VPN user
The QinQ technology is another kind of simple VPN technologies, the L2 layer technology that it adopts, label encapsulation technology by two-layer IEEE802.1Q standard, promptly outside the private network VLAN label that uses, encapsulate the VLAN label of a public network again, make the VLAN of private network to be transparent to other private network that needs connection from public network.Because it does not need extra signaling support just can realize simple VPN function, can be LAN (the LocalArea Network of the several regions that disperse, local area network (LAN)) forms a big VPLS (Virtual PrivateLAN Service, the virtual special local area network service), therefore very simple and convenient.
Yet, this technology can only use one deck VLAN label to come identifying user VPN, determine the situation of a user VPN when the two-layer VLAN label of needs and then can't support, and in the network application of reality, it is to need to use two-layer VLAN to indicate a user that a lot of places are arranged; In addition, utilize two layers of VLAN label of QinQ technology encapsulation, wherein outer field VLAN label provides the sign of representing VPN by operator, and internal layer VLNA label is provided the kind of representing each VPN interior business by the user.Like this, the configuration of VPN and class of business thereof just must be finished jointly by operator and enterprise network, finish and can not be concentrated by a side.To be exactly each VLAN label in addition defined by the binary system of 12 bits is overall, and so, the problem of bringing is that each port can only be realized 4096 VPN.
VPN technologies based on MPLS then are 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.As following table 1 explicit user normal data frames, table 2 shows the MPLS Frame.
Table 1 user normal data frames
Table 2MPLS 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 obtain the final outbound port information of this VPN customer service on this equipment from the vpn label of this two-layer MPLS label, two layers of ethernet data frame of user VPN are intactly gone out physical port and send from corresponding.
Yet, require equipment must support the MPLS label based on the VPN technologies of MPLS, this just has higher requirement to equipment; In addition, it requires the inner mark that indicates with a kind of business of the same VPN of user must be that the overall situation is unified, can't accomplish the VLAN numerical value difference of (difference that means equipment exports), traffic flag form, and then realize having brought difficulty for the VPN network in different places; At last, because the traffic flag of VPN sign and VPN inside respectively by operator and corporate client configuration, can't be concentrated by a side equally and finish.
Summary of the invention
Purpose of the present invention promptly is to overcome defective and the deficiency that exists in the above-mentioned various prior art, and a kind of method and equipment thereof of new enhanced VPN network optimization is provided.
The invention provides a kind of method of enhanced VPN network optimization for this reason, be used to make that the VLAN of private network is transparent to other private networks that needs connect from public network, at least include a network equipment inbound port and a network equipment outbound port on the wherein said public network, this method comprises the steps:
(1), the user vlan label on the user data frame is mapped to VPN ID according to the mapping table of going into the configuration of physical port place at described network equipment inbound port;
(2) will transmit in described public network inside through the user data frame after the above-mentioned processing;
(3) at described network equipment outbound port, the Frame that will carry VPN ID according to the mapping table that goes out physical port place configuration is mapped to the Frame that carries the user vlan label and transmits.
Wherein, the mapping method described in the step (1) specifically comprises:
(11) at network equipment inbound port, dispose a mapping table, make VPN ID and user vlan label and inbound port number corresponding;
(12) network equipment inbound port, receive the Frame that carries the user vlan label after, above-mentioned mapping table is inquired about;
(13) according to the result of inquiry, the user vlan label that carries in the replacement data frame is VPN ID.
Wherein, the mapping method described in the step (3) specifically comprises:
(31) at network equipment outbound port, dispose a mapping table, make VPN ID and outbound port number corresponding with the user vlan label;
(32) network equipment outbound port, receive the Frame that carries VPN ID after, above-mentioned mapping table is inquired about;
(33) according to the result of inquiry, the VPN ID that carries in the replacement data frame is the user vlan label.
Wherein, described VPN ID is new one deck or two-layer VLAN label; The described network equipment can be switch or router.
The present invention also provides a kind of and possesses CPU and commercial forwarding chip for implementing the network equipment that said method is made, and takes a step forward at commercial forwarding chip a modular converter is set, wherein:
This module is gone into physical port in each of the network equipment, according to the user vlan label of configuration and inbound port number mapping table with VPN ID, the user vlan label that carries in the Frame is replaced to new VPN ID, recomputate the commercial ASIC that gives the back behind the CRC and carry out follow-up forwarding;
This module goes out physical port the network equipment corresponding, according to the VPN ID of configuration and outbound port number mapping table with this VPN user's user vlan label, after the Frame that carries VPN ID regenerated the Frame that carries the user vlan label, give commercial forwarding chip and transmit.
Wherein, described VPN ID can be new one deck or two-layer VLAN label; Before treated Frame was given commercial forwarding chip forwarding, this modular converter also need recomputate CRC; The described network equipment can be a switch, also can be router.Compared with prior art, because being supported in, the present invention adopt two-layer VLAN label to represent VPN ID in the Layer 2 data frame, therefore the present invention can realize 4K*4K VPN, has expanded the quantity of VPN greatly, for the increase of VPN number of users has been done to support preferably.Simultaneously, can change the numerical value of user vlan label respectively in the method for inbound port and outbound port configuration mapping table, thereby can (corresponding different physical locations) have the different forms of expression so that the customer service kind of a VPN inside is marked at different physical ports, and can realize only centralized configuration on an equipment, therefore simplified network design.At last, point provided by the invention does not need to adopt the switch with MPLS function to the method for multiple spot VPN, can use on current numerous low and middle-end equipment, thereby can reduce the cost of Virtual network operator greatly.
Description of drawings
Accompanying drawing is to adopt device interior hardware configuration schematic diagram of the present invention.
Embodiment
In order to understand the present invention better, the present invention is described further below in conjunction with specific embodiment, and certainly, this specific embodiment is demonstration of the present invention and typical case, can not be construed as limiting the present invention's scope required for protection.
The method of enhanced VPN network optimization provided by the invention, its typical implementation step comprise that the carrier network inbound port is handled, transmit carrier network inside and the carrier network outbound port is handled three key steps.Herein, be that example is in order better to demonstrate in conjunction with practical situation with the operator, the carrier network here can be any network with two-layer VPN function.Inbound port, the outbound port of Virtual network operator can be the physical ports on the heterogeneous networks equipment in consolidated network herein simultaneously, also can be the different physical ports on the consolidated network equipment in the consolidated network, even can be the same physical port on the consolidated network equipment in the consolidated network, the network equipment herein is generally switch or router.
At first, describe carrier network inbound port processing method among the present invention in detail.
The switch that is connected with user network at the carrier network edge go into the physical port direction, add a table and finish VPN user's the identification and the replacement work of VLAN label.The input of this table is inbound port and its one deck that carries or the two-layer VLAN label of user VPN Frame, and the output after tabling look-up is other one deck or the two-layer VLAN label of representing the operator of VPN sign to use.Need to prove that described table can be a human configuration, also can realize, as long as can realize above-mentioned logical mappings function with other method.Simultaneously, if the VLAN label of the Layer 2 data frame after being replaced is one deck, support 4096 VPN so; If the VLAN label after replacing is two-layer, support 4K*4K VPN so.
Table 3 is demonstration example of operator's inbound port mapping table.
It must be unified in operator's internal network that one deck after the replacement or two-layer VLAN label are represented the VPN ID of VPN, the VPN ID of indication is a kind of logical concept herein, such as in table 3, user's dual-VLAN label of going into physical port 1 is mapped to represents 301,302 of VPN sign, 301+302 has formed VPN ID jointly, be assumed to be VPN1, can learn, the dual-VLAN label of going into physical port 3 also has been mapped to the VPN1 of 301+302, therefore in table 3, the user who goes into physical port 1 and 3 representatives belongs to same VPN user.
And the VLAN label before replacing is owing to be to come according to concrete inbound port configuration, has the VLAN label of a plurality of different ports to be mapped to the situation of an identical VPN ID.
Then, carry out the forwarding of carrier network inside.In the repeating process of carrier network inside, carrying out self study according to the sign of the VLAN after the conversion transmits, up to being forwarded to the carrier network outlet, the repeating process of the two-layer VPN inside that this process and common operator provide does not have any difference, repeats no more herein.
Below, describe operator's outbound port processing method in detail.
At the Way out of the dual-VLAN label VPN of operator switch, add the conversion that a table is finished VPN sign with the VLAN sign of user's use of operator's use.The input of this table is one deck or a two-layer VLAN label of representing VPN ID sign, and output is that this VPN is at user's form of expression VLAN of this output port label (one deck or two-layer).
Table 4 is demonstration example of operator's outbound port mapping table.
This of outbound course table also according to concrete outbound port configuration, that is to say an identical VPNID, and at different physics output ports, the two-layer user vlan label after the translation can be different.
Need to prove, technical scheme provided by the invention can support to have the Frame of one deck or two-layer VLAN label, if the label after above-mentioned carrier network inbound port table is replaced has only one deck, and just carry out MAC address learning and forwarding subsequently according to this layer label, can only support 4096 VPN so, this is that in the market all chips can be supported.If but the label after the inbound port table is replaced has two-layer, and carry out MAC address learning and forwarding according to two-layer label subsequently, so just can support 4096*4096 VPN, the forwarding chip function of the equipment that this just links to each other with user network to carrier network is had higher requirement.This is general general network switch, particularly have commercial L2/L3 forwarding chip switch can not support.
For this reason, the invention provides a kind of equipment of implementing method provided by the invention that is exclusively used in.Introducing realization the present invention in detail below in conjunction with accompanying drawing adopts the dual-VLAN label that the inside principle of compositionality of the equipment of the method that a little arrives the multiple spot two-layer VPN is provided.
Present commercial L2/L3 layer switch forwarding chip is all supported the forwarding based on VLAN, therefore as shown in Figure 1, the present invention has added a modular converter in the forwarding chip front, can realize that modular converter herein can also can be realized with the method for software with hardware to having the support that dual-VLAN tagging user Frame is transmitted.
The concrete function that this module realizes is described below: at each physical port Way in of switch, according to the two-layer VLAN label of CPU configuration mapping table to one deck (or two-layer) VLAN label, be mapped to the new VLAN that represents two-layer VPN ID, recomputate the commercial ASIC that gives the back behind the CRC then and carry out follow-up forwarding; In the outlet of each GE (gigabit Ethernet), again according to the new VLAN label of representing two-layer VPN ID, be configured in the mapping table of each port according to CPU, regenerate two-layer label, send after recomputating CRC then.
FPGA in the modular converter (Field program gate array, field programmable gate array) does simple working (mapping and CRC), and its cost is lower.And form is configured on each physical port, thus FPGA can only finish as required support dual-VLAN label VPN port go into/go out conversion work, rather than must on all of the port, all realize.
In sum, adopt method and apparatus provided by the invention, under the situation of lower cost, just can strengthen the function that existing two-layer VPN network provides, particularly can handle two layers of ethernet data frame that have the dual-VLAN label, can realize 4K*4K VPN, network collocating method is also more flexible, easy simultaneously.
Claims (9)
1. the method for an enhanced VPN network optimization, be used to make that the VLAN of private network is transparent to other private networks that needs connect from public network, at least include a network equipment inbound port and a network equipment outbound port on the wherein said public network, it is characterized in that this method comprises the steps:
(1), the user vlan label on the user data frame is mapped to VPN ID according to the mapping table of going into the configuration of physical port place at described network equipment inbound port;
(2) will transmit in described public network inside through the user data frame after the above-mentioned processing;
(3) at described network equipment outbound port, the Frame that will carry VPN ID according to the mapping table that goes out physical port place configuration is mapped to the Frame that carries the user vlan label and transmits.
2. method according to claim 1 is characterized in that, the mapping method described in the step (1) specifically comprises:
(11) at network equipment inbound port, dispose a mapping table, make VPN ID and user vlan label and inbound port number corresponding;
(12) network equipment inbound port, receive the Frame that carries the user vlan label after, above-mentioned mapping table is inquired about;
(13) according to the result of inquiry, the user vlan label that carries in the replacement data frame is VPN ID.
3. method according to claim 1 is characterized in that, the mapping method described in the step (3) specifically comprises:
(31) at network equipment outbound port, dispose a mapping table, make VPN ID and outbound port number corresponding with the user vlan label;
(32) network equipment outbound port, receive the Frame that carries VPN ID after, above-mentioned mapping table is inquired about;
(33) according to the result of inquiry, the VPN ID that carries in the replacement data frame is the user vlan label.
According to claim 2 or 3 described methods, it is characterized in that 4, described VPN ID is new one deck or two-layer VLAN label.
5, according to any method described in the claim 1 to 3, it is characterized in that the described network equipment is switch or router.
6, a kind of possess CPU and commercial forwarding chip for implementing the network equipment that the described method of claim 1 is made, and it is characterized in that: taking a step forward at commercial forwarding chip is provided with a modular converter, wherein:
This module is gone into physical port in each of the network equipment, according to the user vlan label of configuration and inbound port number mapping table with VPN ID, the user vlan label that carries in the Frame is replaced to new VPN ID, recomputate the commercial ASIC that gives the back behind the CRC and carry out follow-up forwarding;
This module goes out physical port the network equipment corresponding, according to the VPN ID of configuration and outbound port number mapping table with the user vlan label, after the Frame that carries VPN ID regenerated the Frame that carries the user vlan label, give commercial forwarding chip and transmit.
7, the network equipment according to claim 6 is characterized in that, described VPN ID is new one deck or two-layer VLAN label.
According to the claim 6 or the 7 described network equipments, it is characterized in that 8, before giving commercial forwarding chip forwarding through the Frame that goes out the physical port processing, this modular converter also need recomputate CRC.
According to the claim 6 or the 7 described network equipments, it is characterized in that 9, the described network equipment is switch or router.
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| CNB2005100564166A CN100446503C (en) | 2005-03-22 | 2005-03-22 | Enhanced VPN network optimization method and apparatus |
| 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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| CN101087236B (en) * | 2007-08-09 | 2010-06-02 | 杭州华三通信技术有限公司 | VPN access method and device |
| CN101345711B (en) * | 2008-08-13 | 2012-08-08 | 成都市华为赛门铁克科技有限公司 | Packet processing method, fire wall equipment and network security system |
| CN101588305B (en) * | 2009-06-30 | 2012-02-08 | 杭州华三通信技术有限公司 | message handling method carried with multilayer labels and an exchanger |
| CN105337851B (en) * | 2014-07-02 | 2018-11-27 | 新华三技术有限公司 | A kind of message processing method and ports-Extending plate |
| 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 |
| CN107968749B (en) * | 2017-11-21 | 2021-04-20 | 锐捷网络股份有限公司 | Method for realizing QinQ route termination, switching chip and switch |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |