CN101437037B - Tunnel penetration transmission method for two-layer protocol message - Google Patents
Tunnel penetration transmission method for two-layer protocol message Download PDFInfo
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- CN101437037B CN101437037B CN2008103064550A CN200810306455A CN101437037B CN 101437037 B CN101437037 B CN 101437037B CN 2008103064550 A CN2008103064550 A CN 2008103064550A CN 200810306455 A CN200810306455 A CN 200810306455A CN 101437037 B CN101437037 B CN 101437037B
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Abstract
The invention relates to the field of network communication. The invention provides a method for realizing tunnel-induced transmission of two-layer protocol message of different types by using the same tunnel MAC address. The method for tunnel-induced transmission of two-layer protocol messages comprises: a, terminal entrance end equipment acquires an original two-layer protocol message and the type of message; b, the tunnel entrance end equipment adds a virtual local area network tag VLAN TAG field to the original two-layer protocol message, sets a field value indicating the type of the message in a specific field of the original layer-two protocol message according to the type of the message and acquires the revised two-layer protocol message; c, the tunnel entrance end equipment carries out tunnel message encapsulation of the revised two-layer protocol message and transmits the tunnel message; d, tunnel exit end equipment converts the revised two-layer protocol message into the original two-layer protocol message and transmits the original two-layer protocol message to a target user. The method contributes to the expansion of two-layer protocol channel and has good flexibility.
Description
Technical field
The present invention relates to network communication field, relate in particular to the method and system of two-layer protocol control in two layers of switching network, also related to two-layer protocol sign of carrying out the tunnel transparent transmission and the method for reducing.
Technical background
The two-layer protocol tunneling technique, the two-layer protocol of permission strange land user network with the two layer switching network of tunnel style through network provider, is realized the protocol interaction of different regions user network, realizes long-range two-layer protocol function.Two-layer protocol message realizes transparent transmission in the tunnel.The two-layer protocol message form is following:
| DMAC | SMAC | Length | DSAP | SSAP | CNTL | …… |
The target MAC (Media Access Control) address of DMAC presentation protocol message wherein; The source MAC of SMAC presentation protocol message; The length of Length presentation protocol message; The destination service access point of DSAP presentation protocol message; The source service access point of SSAP presentation protocol message; CNTL representes the control word segment value.
Publication number is that the patent document of CN1863148 and the penetration transmission scheme that disclosed a kind of two-layer protocol message in 2006 are following:
As shown in Figure 1; Going into the tunnel end, going into the two-layer protocol message that receives user network CE1 on the tunnel end equipment PE1, identification needs the protocol massages of tunnel transparent transmission; The VLAN (VLAN) of identification user network CE1; Add VLAN TAG (VLAN tag) message field (MFLD) and be the VLAN ID (virtual local area network No.) of the user network CE1 that identifies, carry out the channel message encapsulation again, the target MAC (Media Access Control) address of promptly replacing protocol massages is that (this paper is referred to as the channel message target MAC (Media Access Control) address for the special multicast MAC of appointment; Be called for short tunnel MAC), become channel message.Send from the output of going into tunnel end equipment PE1.For example; The VLAN ID of user network CE1 is 10; STP (Spanning-Tree Protocol) message sends to into tunnel end equipment PE1 from user network CE1, goes into tunnel this protocol massages of end equipment PE1 transparent transmission, and the target MAC (Media Access Control) address 0x0180-c200-0000 of STP BPDUs is replaced with tunnel MAC Address 0x0100-00cd-ccd0; Increase VLAN ID is 10 VLAN TAG field, from VLAN 10, forwards then.
In two layers of switching network, channel message reaches out tunnel end equipment through in VLAN, transmitting.Going out tunnel end equipment PE2, can discern channel message through the tunnel MAC Address of appointment, with the target MAC (Media Access Control) address reduction (this process is for resolving channel message) of protocol massages, deletion VLAN TAG field, the protocol massages after the transmission reduction is to user network CE2.For example, tunnel end equipment PE2 receives that from VLAN 10 target MAC (Media Access Control) address is the message of 0x0100-00cd-00d0; Judge that through legitimacy this message is a channel message, and need this channel message be gone out the tunnel processing; The target MAC (Media Access Control) address of channel message is reduced to the target MAC (Media Access Control) address 0x0180-c200-0000 of protocol massages; Deletion VLAN TAG field, protocol massages is reduced, and sends to user network CE2 then.
In the technique scheme, specify the tunnel MAC Address number of encapsulation limited.If different two-layer protocols encapsulate different tunnels MAC Address,, and increased the implementation complexity of tunnel transmission with the tunnel MAC Address number that is subject to operable appointment.If two-layer protocol all encapsulates the same tunnel MAC Address; Then for the channel message of some two-layer protocol (like STP, BMGA etc.); Can't go out difference and reduction on the tunnel device, can not handle and realize the compatibility issue of a plurality of two-layer protocol encapsulation same tunnel MAC.With STP and BMGA message is example, and explanation can't compatibility issue.
The STP BPDUs form is following:
| DMAC 0180-c200-0000-0000 | SMAC … | Length … | DSAP 0x42 | SSAP 0x42 | CNTL 0x03 | …… |
The BMGA message format is following:
| DMAC 0180-c200-0000-0010 | SMAC … | Length … | DSAP 0x42 | SSAP 0x42 | CNTL 0x03 | …… |
It is following through the channel message form of amended STP to press such scheme:
| DMAC 0100-00cd-00cd-00d0 | SMAC … | VLAN?TAG … | Length … | DSAP 0x42 | SSAP 0x42 | CNTL 0x03 | … |
It is following through the channel message form of amended BMGA to press such scheme:
| DMAC 0100-00cd-00cd-00d0 | SMAC … | VLAN?TAG … | Length … | DSAP 0x42 | SSAP 0x42 | CNTL 0x03 | … |
By on can know that this two kinds of messages can't discerned and distinguish to the channel message frame format of the channel message of STP and BMGA relatively through header information, can not reduce to channel message.Conflict property between other messages is no longer enumerated.Be in the prior art, can't use the transparent transmission in the compatible a plurality of two-layer protocols of same tunnel MAC Address tunnel.The two-layer protocol message of conflict is carried out the tunnel transparent transmission, needs different tunnel MAC, has limited the expansion in two-layer protocol tunnel, has increased the implementation complexity in two-layer protocol tunnel, has the defective of very flexible.
Summary of the invention
Technical problem to be solved by this invention is that a kind of method of using the same tunnel MAC Address to realize the tunnel transparent transmission of two-layer protocol message of different types is provided.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be, the tunnel transmitting method of two-layer protocol message is characterized in that, may further comprise the steps:
A, go into tunnel end equipment and obtain the original two-layer protocol message and the type of message thereof that need carry out the tunnel transparent transmission;
B, go into tunnel end equipment and in said original two-layer protocol message, increase a VLAN tag VLAN TAG field, be used to represent virtual local area network No. under the tunnel end equipment; And the field value that shows this type of message is set in the specific field of original two-layer protocol message according to type of message, obtain amended two-layer protocol message;
D, go into after tunnel end equipment carries out channel message encapsulation with amended two-layer protocol message, forwarding the VLAN of channel message under going into tunnel end equipment;
E, go out tunnel end equipment and obtain channel message after, resolve channel message and obtain amended two-layer protocol message;
F, go out tunnel end equipment, obtain behind the type of message in this specific field of reduction field value and be in the original two-layer protocol message pairing field value in this specific field through the field value in the specific field; And deletion VLAN TAG field, amended two-layer protocol message is reduced to original two-layer protocol message;
G, go out tunnel end equipment original two-layer protocol message is forwarded to the targeted customer.
The invention has the beneficial effects as follows, can let the transparent transmission in the compatible a plurality of two-layer protocols of same tunnel MAC Address tunnel, be beneficial to the expansion in two-layer protocol tunnel, flexibility is good.
Description of drawings
Fig. 1 is the network diagram in the tunnel transparent transmission process of two-layer protocol message;
Fig. 2 is for going into the process chart of tunnel end equipment among the embodiment;
Fig. 3 is for going out the process chart of tunnel end equipment among the embodiment.
Embodiment
Method provided by the invention both can realize in centralized construction system, also can in the distributed architecture system, realize.Concrete technical scheme implementation method is following:
The two-layer protocol control module received, discerns and the processing two-layer protocol message before protocol process module, guaranteed that two-layer protocol has passed through the processing of control module.
The two-layer protocol control module needs to discern the two-layer protocol type, the agreement that need not carry out control and treatment is left intact, and has guaranteed the compatibility of two layers of control protocol to original system.
To the two-layer protocol that needs are controlled, search the corresponding processing strategy through its type, and carry out handled.As can take following several kinds of strategies: abandon protocol massages, with the message tunnel transparent transmission, directly message is submitted protocol process module to two-layer protocol message.
In the processing that abandons agreement, can select multiple drop policy: (1) directly abandons protocol massages, and this protocol massages is filtered out.(2) strategy abandons, and abandons or speed limit is passed through like speed limit, and the number of such protocol massages that passes through in the restricted unit time when surpassing setting, abandons protocol massages.Above-mentioned strategy is giving an example of practice, and strategy can change.Handle through abandoning protocol massages, can practice thrift the resource that additional protocol is resolved, handled.Strategy through to message abandons, and can resist the attack of external network to system, guarantees the normal effectively operation of resources effective utilization and system.
In the tunnel transparent transmission of protocol massages, the solution that solves compatible conflict two-layer protocol is to go into the tunnel end, and the specific field that sign is distinguished different two-layer protocol message types is set in two-layer protocol message.Going out the tunnel end, the specific field that is provided with when going into the tunnel is distinguished and the reduction channel message is a protocol massages.With STP and BMGA protocol massages is example, and the concrete way that specific field is set is described.
The STP BPDUs form is following:
| DMAC 0180-c200-0000-0000 | SMAC … | Length … | DSAP 0x42 | SSAP 0x42 | CNTL 0x03 | …… |
The BMGA message format is following:
| DMAC 0180-c200-0000-0010 | SMAC … | Length … | DSAP 0x42 | SSAP 0x42 | CNTL 0x03 | …… |
Be made as ssap field like specific field, then the STP BPDUs ssap field be revised as 0x01 by original 0x42, have original 0x42 to be revised as 0x02 the ssap field of BMGA message.Amended STP channel message form is following:
| DMAC 0100-00cd-00cd-00d0 | SMAC … | VLAN?TAG … | Length … | DSAP 0x42 | SSAP 0x01 | CNTL 0x03 | …… |
Amended BMGA channel message form is following:
| DMAC 0100-00cd-00cd-00d0 | SMAC … | VLAN?TAG … | Length … | DSAP 0x42 | SSAP 0x02 | CNTL 0x03 | …… |
Going out the tunnel end, read ssap field, be 0x01 like field value, represent that then this type of message is a STP BPDUs; Like field value is 0x02, representes that then this type of message is the BMGA message.After the difference outgoing packet type, the reduction ssap field, the ssap field that STP BPDUs is corresponding with the BMGA message all is reduced to 0x42.
Certainly specific field also can be used other field or a plurality of field.Such as being specific field with the DASP field, or with DASP, ssap field together as specific field.With DASP, ssap field is example as specific field together, and amended STP channel message form is following:
| DMAC 0100-00cd-00cd-00d0 | SMAC … | VLAN?TAG … | Length … | DSAP 0x01 | SSAP 0x01 | CNTL 0x03 | …… |
Amended BMCA channel message form is following:
| DMAC 0100-00cd-00cd-00d0 | SMAC … | VLAN?TAG … | Length … | DSAP 0x02 | SSAP 0x02 | CNTL 0x03 | …… |
STP BPDUs DSAP and ssap field are revised as 0x01 by original 0x42 going into the tunnel end, have original 0x42 to be revised as 0x02 the DSAP and the ssap field of BMGA message.Going out the tunnel end, reading DSAP and ssap field, be 0x01, representing that then this type of message is a STP BPDUs like the field value of two fields; Field value like two fields is 0x02, representes that then this type of message is the BMGA message.After the difference outgoing packet type, reduction DSAP and ssap field, the DSAP that STP BPDUs is corresponding with the BMGA message all is reduced to 0x42 with the corresponding field value of ssap field.
Above-mentioned description to specific field only is used to explain specific field and the method for revising field value selected.When practical implementation this method, can select specific field or field combination as required, selection needs the field value of setting.
Channel message is transparent transmission in the tunnel, and the field value of specific field setting can not influence the forwarding and the processing of channel message in the channel message.
Specific field to two-layer protocol message is provided with field value, carries out the step that comprises of tunnel transparent transmission:
(1) obtains the original two-layer protocol message and the type of message thereof that need carry out the tunnel transparent transmission;
(2) search message flag field (or field combination) and the field value that needs setting through type of message;
(3) field value of appointment is set on the specific field of original two-layer protocol message;
(4), give the tunnel module and go into tunnel end processing with amended protocol massages.
Being provided with of the field value of specific field can be carried out separately, also can merge in the processing in tunnel to carry out together.Certainly; Generate a channel message of the present invention; When specific field is made amendment, in original two-layer protocol message, also need increase a VLAN tag VLAN TAG field, be used for expression and go into the described virtual local area network No. of tunnel end equipment; After the modification of VLAN TAG field and specific field is accomplished, amended two-layer protocol message is carried out channel message encapsulation (target MAC (Media Access Control) address of protocol massages is replaced with the tunnel MAC Address), finally obtain channel message.
Go out the tunnel end, carry out the channel message step of reducing and comprise:
(1), resolves channel message and obtain amended two-layer protocol message (the tunnel MAC Address being reduced to the target MAC (Media Access Control) address of protocol massages) from going out the channel message that the tunnel end obtains;
(2) through type of message and the specific field of correspondence and the match information of field value thereof,, obtain type of message through matching check.Through type of message, the field value of reduction specific field, and leave out VLAN TAG field reduction original two-layer protocol message;
(3) original two-layer protocol message with reduction sends.
To obtaining of type of message, and the reduction of protocol massages, can carry out separately, also in being placed on out the tunnel processing, carry out together.
In embodiments, going into the tunnel end should be consistent with the type of message and the specific field thereof that go out the tunnel end, field value.Protocol massages has carried out the modification and the reduction of specific field in the tunnel transparent transmission, effectively solved the problem that the channel message type can't be distinguished and discern, and has realized use same tunnel MAC Address, simultaneously the function of the multiple two-layer protocol message of compatible transparent transmission.
Embodiment
STP:Spanning Tree Protocol, Spanning-Tree Protocol.
RSTP:Rapid Spanning Tree Protocol, RSTP.
MSTP:Multiple Spanning Tree Protocol, Multiple Spanning Tree Protocol.
BMGA:Bridge Management Group Address, the bridging management group address.
GARP:Generic Attribute Registration Protocol, general log-in protocol.
GVRP:GARP VLAN Registration Protocol, GARP VLAN log-in protocol, the general log-in protocol of VLAN, a kind of application of GARP.
GMRP:GARP Multicast Registration Protocol, GARP Multicast Registration Protocol, the general log-in protocol of multicast, a kind of application of GARP.
Practical implementation example of the present invention is described below, only is used to illustrate, be not limited to use of the present invention.
Among the embodiment, tunnel style realizes that through two layers of switching network the two-layer protocol of different regions user network is mutual, realizes long-range two-layer protocol function.As shown in Figure 1, need to realize that user network CE1 and user network CE2 carry out protocol interaction, through the tunnel STP, BMGA, GVRP protocol massages are carried out transparent transmission.User network CE1 is connected with service provider equipment PE1, and user network CE2 is connected with service provider equipment PE2.Transmit channel messages through two layers of switching network between service provider equipment PE1 and the service provider equipment PE2.
In order to accomplish the protocol interaction of user network CE1 and user network CE2, carry out two-layer protocol control respectively at service provider equipment PE1 and service provider equipment PE2, carry out the two-layer protocol message control strategy, set up tunnelling function.
PE1 goes into the tunnel with CE1 protocol massages slave unit, and slave unit PE2 goes out the tunnel, and to be transmitted to CE2 be example, and the practical implementation method is described.
The handling process of equipment PE1 is as shown in Figure 2.Equipment PE1 goes up taking following strategy from the two-layer protocol message of user network CE1: the STP agreement is carried out Control for Speed Limitation, and the message that abandons above limit the number, and carry out the tunnel transparent transmission; BMGA protocol massages, GVRP protocol massages are carried out transparent transmission; The GMRP protocol massages is directly abandoned; Other messages are directly submitted protocol process module to be handled.In the flow process of tunnel transparent transmission; The ssap field value of STP BPDUs is set to 0x01; The ssap field value that the ssap field value of BMGA message is set to 0x02, GVRP message is set to 0x03; The purpose MAC of replacement protocol massages is tunnel MAC (respectively the purpose MAC0180-c200-0000-0000 of STP BPDUs corresponding protocols message, the purpose MAC0180-c200-0000-0010 of BMGA message corresponding protocols message, the purpose MAC0180-c200-0000-0020 of GVRP message corresponding protocols message all being replaced with tunnel MAC0100-00cd-00cd-00d0); Increase VLAN ID is 10 VLAN TAG field, and the channel message that generates is sent.
The handling process of equipment PE2 is as shown in Figure 3.Equipment PE2 receives the two-layer protocol channel message, and channel message is carried out validity checking, abandons invalid packet.Through tunnel MAC Address, attribute field SSAP and settings coupling; Identify STP channel message, BMGA channel message, GVRP channel message; According to the channel message type of identification, with the target MAC (Media Access Control) address reduction of ssap field value and protocol massages, and deletion VLAN TAG field.Channel message is reduced to original two-layer protocol message, is transmitted to user network CE2.
The two-layer protocol message slave unit PE2 of user network CE2 goes into the tunnel, and slave unit PE1 goes out the tunnel, and to be transmitted to flow process and the above-mentioned flow process of user network CE1 similar.
Claims (4)
1. the tunnel transmitting method of two-layer protocol message is characterized in that, may further comprise the steps:
A, go into tunnel end equipment and obtain the original two-layer protocol message and the type of message thereof that need carry out the tunnel transparent transmission;
B, go into tunnel end equipment and in said original two-layer protocol message, increase a VLAN tag VLAN TAG field, be used to represent virtual local area network No. under the tunnel end equipment; And the field value that shows this type of message is set in the specific field of original two-layer protocol message according to type of message, obtain amended two-layer protocol message;
D, go into after tunnel end equipment carries out channel message encapsulation with amended two-layer protocol message, forwarding the VLAN of channel message under going into tunnel end equipment;
E, go out tunnel end equipment and obtain channel message after, resolve channel message and obtain amended two-layer protocol message;
F, go out tunnel end equipment, obtain behind the type of message in this specific field of reduction field value and be in the original two-layer protocol message pairing field value in this specific field through the field value in the specific field; And deletion VLAN TAG field, amended two-layer protocol message is reduced to original two-layer protocol message;
G, go out tunnel end equipment original two-layer protocol message is forwarded to the targeted customer.
2. the tunnel transmitting method of two-layer protocol message according to claim 1 is characterized in that said specific field is the combination of the one or more fields in the original two-layer protocol message.
3. like the tunnel transmitting method of the said two-layer protocol message of claim 2, it is characterized in that said specific field is dsap field or ssap field.
4. like the tunnel transmitting method of the said two-layer protocol message of claim 2, it is characterized in that said specific field is the combination of dsap field and ssap field.
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| CN105934998B (en) * | 2014-12-29 | 2019-11-01 | 华为技术有限公司 | A kind of data transmission method and packet data network gateway equipment |
| CN106973053B (en) * | 2017-03-29 | 2019-10-11 | 网宿科技股份有限公司 | The acceleration method and system of BAS Broadband Access Server |
| CN111371800B (en) * | 2020-03-12 | 2022-09-06 | 深圳市三旺通信股份有限公司 | Message processing method, device and readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7058059B1 (en) * | 2001-02-20 | 2006-06-06 | At&T Corp. | Layer-2 IP networking method and apparatus for mobile hosts |
| CN101132365A (en) * | 2007-08-31 | 2008-02-27 | 华为技术有限公司 | Message unvarnished transmission method and apparatus |
| CN101222437A (en) * | 2008-01-25 | 2008-07-16 | 杭州华三通信技术有限公司 | Method and system for transparent transmission of BPDU packet in two-layer switching network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7058059B1 (en) * | 2001-02-20 | 2006-06-06 | At&T Corp. | Layer-2 IP networking method and apparatus for mobile hosts |
| CN101132365A (en) * | 2007-08-31 | 2008-02-27 | 华为技术有限公司 | Message unvarnished transmission method and apparatus |
| CN101222437A (en) * | 2008-01-25 | 2008-07-16 | 杭州华三通信技术有限公司 | Method and system for transparent transmission of BPDU packet in two-layer switching network |
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