CN106713137A - VPN method based on segment routing and SDN technology and device and system thereof - Google Patents
VPN method based on segment routing and SDN technology and device and system thereof Download PDFInfo
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Abstract
The invention discloses a VPN data transmission method based on segment routing in a SDN and a device and a system thereof. The method comprises the steps that entrance supplier edge equipment PE packages information transmitted by a first CE into a data packet including tag information according to the tag of second user edge equipment CE and the tag of a target PE; and the entrance PE transmits the packaged data packet to core layer equipment P, the core layer equipment establishes a forwarding path according to the tag of the target PE in the data packet and routes the data packets to the target PE, and the target PE routes the information transmitted by the first CE in the data packet to a second CE according to the tag of the second CE. According to the method, the device, and the system, the VPN routing information is published by using the integrated deployment mode SDN controller for forwarding so that the operation and maintenance workload can be reduced, and the service provider service operation efficiency can be enhanced.
Description
Technical field
The present invention relates to the SDN fields in data communication, more particularly to it is based in a kind of SDN
The VPN data transmission method of Segment routing, apparatus and system.
Background technology
Three-layer VPN (Virtual Private Network, VPN) is IP
One important application of (Internet Protocol, Internet protocol) technology, it is presently most used
Technical scheme be BGP (Border Gateway Protocol, Border Gateway Protocol) MPLS
(Multi-Protocol Label Switch, multiprotocol label switching) VPN, but prior art
In be primarily present three problems：Need the presence of special signaling protocol LDP (Label
Distribution Protocol, tag distribution protocol), and core node need to preserve all
LSP (Label Switched Path, label switched path) state, but LSP states and PE
(Provider Edge, there is provided business's edge device) quantity is related, PE configuration work amounts one by one
Greatly, poor expandability.If noticing user using MP-BGP agreements to route, to ensure BGP pairs
Deng the connectedness between body, it is necessary to set up full annexation between bgp peer, configuration process
In there is n squares problems, when bgp peer number is a lot, to Internet resources and CPU
The consumption of (Central Processing Unit, central processing unit) resource is all very big.
Therefore, it is necessary to propose the data transmission method in a kind of SDN, that improves network can
Autgmentability, reduces the consumption to Internet resources and cpu resource.
The content of the invention
The disclosure technical problem to be solved be how to provide it is a kind of improve network it is expansible
Property, reduce to the transmission side data in the SDN of the consumption of Internet resources and cpu resource
Method.
The disclosure provides the VPN data transmission method based on Segment routing in a kind of SDN,
Including：Labels and mesh of the entrance provider edge PE according to second user edge device CE
Mark the label Information encapsulation that sends a CE of PE into the packet containing label information；Enter
Packet after the encapsulation is sent to core layer equipment P, the core layer equipment root by mouth PE
Forward-path is set up according to the label of the target PE in the packet, the packet is routed to
Target PE, the target PE send out a CE in the packet according to the label of the 2nd CE
The information router for sending gives the 2nd CE.
Further, the entrance provider edge PE is according to second user edge device
The label of CE believes the Information encapsulation that a CE sends into containing label with the label of target PE
Include before the packet of breath：Controller receives entry PE and target PE to be believed based on contiguous segment
The interface message that breath adj segment are reported, the interface message includes first, second CE's
Interface message and entry PE, the interface message of target PE；The controller is according to receiving
The Route Distinguisher of interface message, the segment label informations of each PE of unified definition, and CE
The label information of RD, route purpose RT；The controller issues the mark using south orientation agreement
Label information, wherein, the south orientation agreement includes PECP agreements, the border net of path computation element
Close protocol link state BGP-LS, network environment setting command Netconfig.
Further, the controller receives entry PE and target PE is based on contiguous segment information
The interface message that adj segment are reported includes：When user virtual routing forwarding VRF is defined
Binding contiguous segment information adj-segment, label one virtual routing forwarding of correspondence,
And by label storage in Segment routing tag library.
Further, the entrance provider edge PE is according to second user edge device
The label of CE believes the Information encapsulation that a CE sends into containing label with the label of target PE
The packet of breath includes：The label of target PE, the 2nd CE is inserted into a CE by entry PE
In the information of transmission, wherein, the stack that the label of target PE is placed on into interface label is first, by second
The label of CE is put into the stack bottom of interface label.
Further, by using expanding internal gateway protocol IGP protocol realization device within the domain
Route data information mutual communication, each equipment need not preserve any status information, and need not run it
His signaling protocol such as LDP, RSVP-TE etc..
The present invention also provides the VPN data transmission dress based on Segment routing in a kind of SDN
Put, including：Package module, for label and target according to second user edge device CE
The Information encapsulation that the label of PE sends a CE is into the packet containing label information；Forwarding
Module, for the packet after the encapsulation to be sent into core layer equipment P, the core layer sets
The label of the standby target PE in the packet sets up forward-path, by the data packet
By giving target PE, the information that the target PE sends a CE according to the label of the 2nd CE
It is routed to the 2nd CE.
Further, the package module is used to be inserted on the label of target PE, the 2nd CE
In the information that first CE sends, wherein, the label of target PE is placed on the stack of interface label
Head, the label of the 2nd CE is put into the stack bottom of interface label.
The present invention also provides the VPN data transmission system based on Segment routing in a kind of SDN
System, including：Including the VPN data transmitting device based on Segment routing in above-mentioned SDN
Provider edge PE, and core layer equipment P, customer edge CE, controller；
Wherein, controller receives PE and is based on the interface letter that contiguous segment information adj segment are reported
Breath, the interface message includes the interface message of CE and the interface message of PE；The controller
The Route Distinguisher RD of unified definition PE and user CE, the label information of route purpose RT；
The controller issues the label information using south orientation agreement, wherein, the south orientation agreement includes
The PECP agreements of path computation element, Border Gateway Protocol Link State BGP-LS, network rings
Border setting command Netconfig issues label information.
Further, the PE includes that entry PE and target PE, the CE include first
CE, the 2nd CE；Wherein, the packet after the encapsulation is sent to core layer and set by entry PE
The label of standby P, target PEs of the core layer equipment P in the packet sets up forwarding
Path, target PE is routed to by the packet, the load point when there is a plurality of forward-path
Load；The information router that the target PE sends a CE according to the label of the 2nd CE is to
Two CE.
Further, contiguous segment information is bound when user virtual routing forwarding VRF is defined
Adj-segment, label one virtual routing forwarding of correspondence, the controller is by the mark
Sign and store in Segment routing tag library.
Further, by using expanding internal gateway protocol IGP protocol realization device within the domain
Routing iinformation intercommunication, each equipment need not preserve any status information.So, without running other
Signaling protocol such as LDP, RSVP-TE etc..
VPN data transmission method based on Segment routing, dress in the SDN that the present invention is provided
Put and system, carried out using concentrating the SDN controllers of deployment way to issue VPN routing iinformations
Forwarding, reduces maintenance work amoun, and lifting Operator Specific Service efficiency of operation improves the expansible of network
Property, reduce the consumption to Internet resources and cpu resource.
Brief description of the drawings
Fig. 1 shows the VPN numbers based on Segment routing in the SDN of one embodiment of the invention
According to the flow chart of transmission method.
Fig. 2 shows that the SDN controller of one embodiment of the invention realizes VPN routing iinformations
The schematic diagram of distribution.
Fig. 3 shows the schematic diagram of packet transmission in the SDN of one embodiment of the invention.
Fig. 4 shows the VPN numbers based on Segment routing in the SDN of one embodiment of the invention
According to the structural representation of transmitting device.
What Fig. 5 was shown in a kind of SDN of one embodiment of the invention based on Segment routing
The structured flowchart of VPN data Transmission system.
Fig. 6 is shown in a kind of SDN of an alternative embodiment of the invention based on segmentation road
By VPN data transmitting device structured flowchart.
Specific embodiment
The present invention is described more fully with reference to the accompanying drawings, wherein illustrating example of the invention
Property embodiment.
Fig. 1 shows the VPN numbers based on Segment routing in the SDN of one embodiment of the invention
According to the flow chart of transmission method.As shown in figure 1, the method mainly includes：
Step 100, entrance provider edge PE is according to second user edge device CE
The information envelope that the label of (Customer Edge) and the label of target PE send a CE
Dress up the packet containing label information.
In one embodiment, controller is received entry PE and target PE and is believed based on contiguous segment
The interface message that breath (adj segment) is reported, the interface message includes first, second CE
Interface message and entry PE, the interface message of target PE；The controller unified definition is each
The segment label informations of PE and RD (the route distinguisher, Route Distinguisher of CE
Or route-distinguisher), the label information of RT (Route Targets, route purpose)；The control
Device processed issues the label information using south orientation agreement, wherein, the south orientation agreement is counted including path
Calculate PECP agreements, Border Gateway Protocol Link State BGP-LS, the network environment setting of element
Order Netconfig.
In one embodiment, controller is received entry PE and target PE and is believed based on contiguous segment
The interface message that breath adj segment are reported includes：Defining user's virtual routing forwarding VRF
When binding contiguous segment information adj-segment, the one virtual flow-line forwarding of a label correspondence
Table, and by label storage in Segment routing tag library.
Packet after the encapsulation is sent to core layer equipment P by step 102, entry PE,
The label of target PE of the core layer equipment in the packet sets up forward-path, will
The packet is routed to target PE, the target PE according to the label of the 2nd CE by the number
According to the information router of CE transmissions in bag to the 2nd CE.
In one embodiment, the label of target PE, the 2nd CE is inserted into first by entry PE
In the information that CE sends, wherein, the stack that the label of target PE is placed on into interface label is first, will
The label of the 2nd CE is put into the stack bottom of interface label.
In one embodiment, by using extension IGP (Interior Gateway Protocol, Interior
Gateway Protocol) protocol realization device within the domain route data information mutual communication, each equipment
Any status information need not be preserved.So, without running other signaling protocols such as LDP, RSVP-
TE etc..
VPN data transmission side based on Segment routing in SDN provided in an embodiment of the present invention
Method, is forwarded using concentrating the SDN controllers of deployment to issue VPN routing iinformations, reduces fortune
Dimension workload, lifts Operator Specific Service efficiency of operation, and lifting Operator Specific Service efficiency of operation improves net
The scalability of network, reduces the consumption to Internet resources and cpu resource.
Fig. 2 shows that the SDN controller of one embodiment of the invention realizes VPN routing iinformations
The schematic diagram of distribution.As shown in Fig. 2 the flow mainly includes：
Step 201, PE 22 reports local user interface information to controller 21, the interface message
Binding has adj-segment labels.Binding adj-segment is to define user VRF
Done when (Virtual Routing Forwarding, virtual routing forwarding), wherein, tie up
Determining example is：Label a correspondence VRF A, Label b correspondence VRF B, wherein, a visitor
It is this in there is segment routing tag libraries that family correspondence one VRF, such as laber a are
Ground is effective.
Step 202, controller 21 is used under the south orientation agreements such as PCEP/BGP-LS/Netconfig
Hair family label information, the label of unified definition RD, RT, controller and record each PE,
The label of P equipment, selects optimal forward-path in repeating process, realizes user's routing iinformation
Exchange and the topological structures of VPN.
Specifically, when defining RT, RD, prior art is done by PE and then by BGP points
Send out, but will be set up between the PE of the whole network BGP connections (n squares connection) or
By RR.Compared with prior art, after controller control, the work of this part can be with
Concentrating on controller part is carried out, and distributed management is changed into centerized fusion, is capable of achieving to user
The encapsulation and forwarding of data.
Using Segment routing technology, equipment need not enter row label conversion on the way, reduce maintenance work
Amount, can eliminate other signaling protocols such as LDP, so intermediate node is changed without label, only
Will be according to label stack forwarding just, repeating process to-controller is unrelated, improves Operator Specific Service fortune
Battalion's efficiency.
Fig. 3 shows the schematic diagram of packet transmission in the SDN of one embodiment of the invention.
As shown in figure 3, the transfer process mainly includes：PE 106 needs to transmit packets to PE87,
Client's label 9001 of PE 87 is placed on label stack bottom first, then the label 87 of PE87 is put
It is first in label stack, controller set the transmission path of the packet as by equipment of the core network 489,
314 propagate, and equipment of the core network P equipment need not change label on the way, need to only be entered according to stack head label
Row forwarding, after PE 87 receives packet, stack head label 87 is ejected, and reads stack bottom label
9001, packet is given to the target CE that link tags are 9001.
PE can search routing table after route requests are received, and find mark where target PE and link
Sign, then stamp target labels, wherein, 87 is target PE labels, and 9001 is object chain
Road.Label propagated by LDP technologies relative to prior art, it is necessary to the side to change on the way
Formula, the data transfer mode that the present invention is provided, label can on the way be propagated and will not be changed, always
To target PE, so, the information transferring method based on Segment routing does not need BGP and LDP
Agreement, intermediateness reduces, without control protocol end to end, and path information storage is in packet
In, alleviate machine utilization；The route propagation mode of centralization, need not the company of foundation between PE
Connect, it is not required that RR；Three is that centralized mode can more easily do path optimization.
Fig. 4 shows the VPN numbers based on Segment routing in the SDN of one embodiment of the invention
According to the structural representation of transmitting device, the device 400 includes：
Package module 401, for label and target PE according to second user edge device CE
The label Information encapsulation that sends a CE into the packet containing label information；
Forwarding module 402, for the packet after the encapsulation to be sent into core layer equipment P,
The label of target PE of the core layer equipment in the packet sets up forward-path, will
The packet is routed to target PE, the target PE according to the label of the 2nd CE by first
The information router that CE sends is to the 2nd CE.
In one embodiment, the package module 401 is used for target PE, the 2nd CE
Label is inserted into the information of CE transmissions, wherein, the label of target PE is placed on interface
The stack of label is first, and the label of the 2nd CE is put into the stack bottom of interface label.
What Fig. 5 was shown in a kind of SDN of one embodiment of the invention based on Segment routing
The structured flowchart of VPN data Transmission system, as shown in figure 5, the system includes：Including being based on
The provider edge PE 501 of the information carrying means of Segment routing, and core layer equipment P
502nd, customer edge CE 503, controller 504；Wherein, controller 504 receives PE
501 interface messages reported based on contiguous segment information adj segment, the interface message bag
Include the interface message of CE and the interface message of PE；The controller unified definition PE's
The Route Distinguisher RD of segment label informations and user CE, the label letter of route purpose RT
Breath；The controller 504 issues the label information using south orientation agreement, wherein, the south orientation
Agreement includes PECP (the Path Computation Element of path computation element
Protocol) agreement, Border Gateway Protocol Link State BGP-LS (BGP Link-State),
Network environment setting command Netconfig issues label information.
In one embodiment, the PE 501 includes that entry PE and target PE, CE 503 are wrapped
Include a CE, the 2nd CE；Wherein, the packet after the encapsulation is sent to core by entry PE
Central layer equipment P, the label of target PE of the core layer equipment 502 in the packet
Forward-path is set up, the packet is routed to target PE；The target PE is according to second
The information router that the label of CE sends a CE is to the 2nd CE.
In one embodiment, adjacent point of binding when user virtual routing forwarding VRF is defined
Segment information adj-segment, label one virtual routing forwarding of correspondence, the controller
504 store in Segment routing tag library the label.
In one embodiment, by using in expanding internal gateway protocol IGP protocol realizations domain
The routing iinformation intercommunication of equipment, each equipment need not preserve any status information.
Fig. 6 is shown in a kind of SDN of an alternative embodiment of the invention based on segmentation road
By VPN data transmitting device structured flowchart.Information carrying means based on Segment routing
600 can possess the host server of computing capability, personal computer PC or can carry
Portable computer, mobile terminal or other-end etc..The specific embodiment of the invention is not to meter
Implementing for operator node is limited.
Information carrying means 600 based on Segment routing includes processor (processor) 601, communication
Interface (Communications Interface) 602, memory (memory) 603 and bus 604.
Wherein, processor 601, communication interface 602 and memory 603 are completed by bus 604
Mutual communication.
Communication interface 602 is used for and network device communications, and wherein the network equipment includes such as virtual machine
Administrative center, shared storage etc..
Processor 601 is used for configuration processor.Processor 601 can be a central processing unit
CPU, or can be application-specific integrated circuit ASIC (Application Specific Integrated
Circuit), or be arranged to implement the embodiment of the present invention one or more integrated circuits.
Memory 603 is used to deposit file.Memory 603 can be stored comprising high-speed RAM
Device, also can also include nonvolatile memory (non-volatile memory), for example, at least one
Magnetic disk storage.Memory 603 can also be memory array.Memory 603 is also possible to be divided
Block, and block can be combined into virtual volume by certain rule.
In one embodiment, said procedure can be to include the program generation of computer-managed instruction
Code.The program is particularly used in：According to the label and target PE of second user edge device CE
The label Information encapsulation that sends a CE into the packet containing label information；By the envelope
Packet after dress is sent to core layer equipment P, and the core layer equipment is according in the packet
The label of target PE set up forward-path, the packet is routed to target PE, it is described
The information router that target PE sends a CE in the packet according to the label of the 2nd CE
To the 2nd CE.
In one embodiment, according to second user edge device CE label and target PE's
The Information encapsulation that label sends a CE is into including before the packet containing label information：Control
Device processed receives entry PE and target PE is based on the interface that contiguous segment information adj segment are reported
Information, the interface message includes the interface message and entry PE, target of first, second CE
The interface message of PE；The controller according to the interface message for receiving, each PE of unified definition
Segment label informations and CE Route Distinguisher RD, the label letter of route purpose RT
Breath；The controller issues the label information using south orientation agreement, wherein, the south orientation agreement
PECP agreements including path computation element, Border Gateway Protocol Link State BGP-LS, net
Network ambient As order Netconfig.
In one embodiment, the controller receives entry PE and target PE is based on adjacent point
The interface message that segment information adj segment are reported includes：Defining user's virtual routing forwarding
Contiguous segment information adj-segment is bound during VRF, label one virtual flow-line of correspondence turns
Deliver, and by label storage in Segment routing tag library.
In one embodiment, the entrance provider edge PE is according to second user edge
The Information encapsulation that the label of equipment CE sends a CE with the label of target PE into containing mark
The packet of label information includes：The label of target PE, the 2nd CE is inserted into first by entry PE
In the information that CE sends, wherein, the stack that the label of target PE is placed on into interface label is first, will
The label of the 2nd CE is put into the stack bottom of interface label.
In one embodiment, by using in expanding internal gateway protocol IGP protocol realizations domain
The route data information mutual communication of equipment, each equipment need not preserve any status information.
Those of ordinary skill in the art are it is to be appreciated that each example in embodiment described herein
Property unit and algorithm steps, can be with electronic hardware or the knot of computer software and electronic hardware
Close to realize.These functions are realized with hardware or software form actually, depending on technical scheme
Application-specific and design constraint.Professional and technical personnel can be for specific application selection not
With method realize described function, but this realize it is not considered that exceeding model of the invention
Enclose.
If realizing function in the form of using computer software and as independent production marketing or using
When, then to a certain extent it is believed that all or part of technical scheme is (such as to existing
Have the part that technology contributes) embody in form of a computer software product.The computer
Software product is generally stored inside in the non-volatile memory medium of embodied on computer readable, including some fingers
Order is used to so that computer equipment (can be personal computer, server or the network equipment
Deng) perform various embodiments of the present invention method all or part of step.And foregoing storage medium bag
Include USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), random
Access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various
Can be with the medium of store program codes.
Description of the invention is given for the sake of example and description, and is not exhaustively
Or limit the invention to disclosed form.Common skill of many modifications and variations for this area
It is obvious for art personnel.Selection and description embodiment are to more preferably illustrate principle of the invention
And practical application, and make one of ordinary skill in the art it will be appreciated that the present invention is suitable so as to design
In the various embodiments with various modifications of special-purpose.
Claims (11)
1. the VPN data transmission method of Segment routing, its feature are based in a kind of SDN
It is, including：
Labels and target of the entrance provider edge PE according to second user edge device CE
The Information encapsulation that the label of PE sends a CE is into the packet containing label information；
Packet after the encapsulation is sent to core layer equipment P, the core layer by entry PE
The label of target PE of the equipment in the packet sets up forward-path, by the packet
Target PE, the target PE are routed to according to the label of the 2nd CE by first in the packet
The information router that CE sends is to the 2nd CE.
2. method according to claim 1, it is characterised in that entrance provider side
Edge equipment PE is according to the label of second user edge device CE and the label of target PE by first
The Information encapsulation that CE sends is into including before the packet containing label information：
Controller receives entry PE and target PE is reported based on contiguous segment information adj segment
Interface message, the interface message and entrance of the interface message including first, second CE
The interface message of PE, target PE；
Segment label of the controller according to each PE of interface message unified definition for receiving
The Route Distinguisher RD of information and CE, the label information of route purpose RT；
The controller issues the label information using south orientation agreement, wherein, the south orientation agreement
PECP agreements including path computation element, Border Gateway Protocol Link State BGP-LS, net
Network ambient As order Netconfig.
3. method according to claim 2, it is characterised in that the controller receive into
Mouth PE and target PE is included based on the interface message that contiguous segment information adj segment are reported：
The binding contiguous segment information adj- when user virtual routing forwarding VRF is defined
Segment, label one virtual routing forwarding of correspondence, and label storage is being divided
In section routing tag storehouse.
4. method according to claim 1, it is characterised in that entrance provider side
Edge equipment PE is according to the label of second user edge device CE and the label of target PE by first
The Information encapsulation that CE sends includes into the packet containing label information：
The label of target PE, the 2nd CE is inserted into entry PE the information of CE transmissions
In, wherein, the stack that the label of target PE is placed on into interface label is first, by the label of the 2nd CE
It is put into the stack bottom of interface label.
5. method according to claim 1, it is characterised in that by using expanding internal
The route data information mutual communication of gateway protocol IGP protocol realization device within the domain, each equipment need not
Preserve any status information.
6. the VPN data transmitting device of Segment routing, its feature are based in a kind of SDN
It is, including：
Package module, for label and the mark of target PE according to second user edge device CE
Sign the Information encapsulation of CE transmissions into the packet containing label information；
Forwarding module, it is described for the packet after the encapsulation to be sent into core layer equipment P
The label of target PE of the core layer equipment in the packet sets up forward-path, will be described
Packet is routed to target PE, the target PE according to the label of the 2nd CE by the packet
In a CE send information router to the 2nd CE.
7. device according to claim 6, it is characterised in that the package module is used for
The label of target PE, the 2nd CE is inserted into the information of CE transmissions, wherein, will
The stack that the label of target PE is placed on interface label is first, and the label of the 2nd CE is put into interface label
Stack bottom.
8. the VPN data Transmission system of Segment routing, its feature are based in a kind of SDN
It is, including：
Including the VPN data based on Segment routing in the SDN as described in claim 6-7
The provider edge PE of transmitting device, and core layer equipment P, customer edge
CE, controller；
Wherein, controller receives PE and is based on the interface that contiguous segment information adj segment are reported
Information, the interface message includes the interface message of CE and the interface message of PE；The control
The segment label informations of device unified definition PE and Route Distinguisher RD, the road of user CE
By the label information of purpose RT；The controller issues the label information using south orientation agreement,
Wherein, the south orientation agreement includes PECP agreements, the Border Gateway Protocol chain of path computation element
Line state BGP-LS, network environment setting command Netconfig issue label information.
9. system according to claim 8, it is characterised in that the PE includes entrance
PE and target PE, the CE include a CE, the 2nd CE；Wherein, entry PE is by institute
State the packet after encapsulation and be sent to core layer equipment P, the core layer equipment is according to the data
The label of the target PE in bag sets up forward-path, and the packet is routed into target PE,
The load balancing when there is a plurality of forward-path；The target PE will according to the label of the 2nd CE
The information router that a CE sends in the packet is to the 2nd CE.
10. system according to claim 8, it is characterised in that：
The binding contiguous segment information adj- when user virtual routing forwarding VRF is defined
Segment, label one virtual routing forwarding of correspondence, the controller is by the label
Storage is in Segment routing tag library.
11. systems according to claim 8, it is characterised in that：
It is mutual by the routing iinformation using expanding internal gateway protocol IGP protocol realization device within the domain
Logical, each equipment need not preserve any status information.
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