CN103491006A - Method for forwarding data of virtual network router in centralized mode - Google Patents
Method for forwarding data of virtual network router in centralized mode Download PDFInfo
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Abstract
The invention discloses a method for forwarding the data of a virtual network router in a centralized mode. According to the method for forwarding the data of the virtual network router in the centralized mode, control planes of virtual network router living examples and data planes of the virtual network router living examples are separated, the control planes operate inside the virtual network router living examples and are responsible for routing computation, the data planes are transferred into an inner core of the virtual network router, a data centralized forwarding engine is formed by the data planes of the network router living examples on the bottom layer of virtual network router equipment, forwarding tables of all the virtual network router living examples are organized and compressed into a shared forwarding table by the data centralized forwarding engine, and forwarding of data of all the living examples on a virtual router node is controlled according to the shared forwarding table. The method for forwarding the data of the virtual network router in the centralized mode has the advantages that cost for data forwarding of the virtual network router can be effectively reduced, link-speed forwarding performance of the virtual network router can be achieved, the number of the virtual network router living examples supported by the virtual network router can be increased, and virtual network data forwarding performance is improved.
Description
Technical field
The invention belongs to Internet technical field, be particularly useful for the novel internet of the virtualized next generation of network enabled such as data center, cloud platform, the data that are specifically related to a kind of virtual network router are unified retransmission method.
Background technology
In recent years, internet arena has occurred that the new technology of many relevant backbone network equipment breaks through, and wherein most important one is virtual networking.Virtual network is after utilizing Intel Virtualization Technology to carry out abstract and division to physical network resource, the logical network of a plurality of independent operatings that build on public network hardware infrastructure.Virtual router is as the nucleus equipment of virtual network, be based upon on the traditional hardware routing device, utilize software engineering to carry out the various resources of multiplexing hardware routing device, the functional simulation of realization to physical router, reach the effect at a plurality of virtual router examples of router device deploy.Can set up many virtual links in logic by tunneling technique between the virtual router example, form virtual network topology environment (Fig. 1).Virtual networking provides more flexibly, more controlled network struction mode, for the development of novel Internet service and application provides good implementation platform.
One redirect of virtual network grouping is sent out, and divides into groups from a virtual router example, through a virtual link be comprised of physical link and a plurality of intermediate physical router, arrives the process of another virtual router example.In traditional virtual network data retransmission technology, each virtual router example is safeguarded respectively control plane and datum plane separately, and being responsible for its affiliated virtual network provides route simultaneously and forward service.Control plane is responsible for moving the virtual network Routing Protocol, and generation is transmitted, and datum plane be take and transmitted as according to completing the forwarding of packets of virtual network.In this pass-through mode, packet will enter the virtual router example and complete route querying, need the repeatedly mapping to Microsoft Loopback Adapter through physical network card, Forwarding Delay is longer, and the datum plane of each example can be competed the physical resources such as CPU, cache, high-speed data path, greatly reduces route querying efficiency.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of data of virtual network router to unify retransmission method, data retransmission flow process to the virtual router example is optimized design, the control plane of virtual router example is separated with datum plane, provide unified forwarding service at the equipment bottom for the grouping that arrives each virtual router example, the present invention can reduce the data retransmission expense of virtual router effectively, make virtual router reach the performance of surface speed forwarding, improve the virtual router example quantity that virtual router can be supported simultaneously, it is the important technology that improves the virtual network data forwarding performance.
To achieve these goals, the technical solution used in the present invention is:
A kind of data of virtual network router are unified retransmission method, and the control plane of virtual router example is separated with datum plane, and control plane operates in each virtual router example inside, are responsible for route and calculate; Datum plane is transferred in the virtual router kernel, the datum plane of each virtual router example forms data at the virtual router device bottom and unifies forwarding engine, unify forwarding engine by this and be responsible for transmit one of tissue the boil down to of each virtual router example are shared and transmitted, and be responsible on this basis the data retransmission of all examples on this virtual router node.
The control plane of each virtual router example operation Routing Protocol, dynamic generating forward list item, and will transmit and be sent to described data and unify forwarding engine.
Described data are unified the set that forwarding engine can be considered datum plane in former each virtual router example, the all functions that possess the general data plane, as packet classification, route querying, an IP verification, packet encapsulation decapsulation etc., it is responsible for virtual router examples all on virtual router unified data retransmission service is provided, and it forwards according to transmitting for the shared of routing message searching module in engine.The control plane of each virtual router example moves respectively Routing Protocol separately and generates and transmits, these are transmitted information exchange and cross communicating by letter between virtual router example and unified forwarding engine and regularly sent to unified forwarding engine, be organized as to share in engine and transmit, so just the information of transmitting of original a plurality of datum planes can be incorporated in a unified forwarding engine.
By building the trie tree, the prefix of transmitting of each virtual router example is unified to index, transmitting of a plurality of virtual router examples can be organized into to shared transmitting.Share and to transmit structure and formed by trie tree, three parts of transmitting of sharing concordance list and each virtual router example.Wherein the trie tree is used for the address prefix of organizing each virtual router example to transmit.The trie tree node that comprises effective prefix information will point to a shared concordance list, and this shared concordance list, using the numbering of each virtual router example as keyword, comes the position of this prefix node of index in corresponding virtual router example is transmitted.
When each virtual router example all adopts IP network, the IP address prefix of trie tree for organizing each virtual router example to transmit, it adopts the mode of level compression, and each node comprises 2
nindividual branch, wherein 1≤n≤32, can mean the n bit in the IP address; Trie sets each node that comprises effective prefix information (being that prefix appears in transmitting of any one virtual router example) and points to a shared concordance list, share concordance list using the numbering of each virtual router example as keyword, come the position of prefix in corresponding virtual router example is transmitted of this trie tree node representative of index, transmitting of each virtual router example transmitted and expanded common router, increased the Origin And Destination information of down hop virtual link in list item.
When the packet on virtual network is arranged arrives virtual router device, proceed as follows:
A) obtain data message decapsulation from physical network card, obtain inner virtual network packet;
B) take virtual router example number corresponding to virtual network packet and destination address field (DAF) is foundation, within described data are unified the routing message searching module of forwarding engine, carries out route querying;
C), after searching end, packet divides three classes to process: if the destination address of packet is each virtual router example, it is submitted to corresponding virtual router example through virtual switch; If the host address that the destination address of packet is equipment, will give transport layer process in packet; The virtual network packet forwarded for needs, after the IP encapsulation is carried out in grouping to data according to route searching result, be sent to down hop virtual router example by it through physical network card.
Described routing message searching module is the core that data are unified forwarding engine, mainly comprises three class functions: 1) set up to share and transmit, the foundation of as each virtual network packet, carrying out route querying; 2) with engine in other module mutual, obtain that each virtual router example is transmitted and the information such as virtual network packet; 3) operated sharing to transmit, as add a forwarding-table item, delete a forwarding-table item, to sharing to transmit, carry out route querying etc.
Compared with prior art, the unified forwarding of virtual network router of the present invention avoided the virtual network grouping to be directed to virtual interface to enter the virtual router example from the virtual router physical interface, be directed to physical interface to enter the process of physical network from virtual interface again complete route querying in example after, reduced the forwarding expense.Saved and transmitted memory space based on shared unified route querying of transmitting, improved route querying efficiency.In addition, unified retransmission technique has alleviated the burden on virtual router example service data plane, can by resource set for the operation and maintenance of control plane agreement, also avoided to a certain extent the excessive task computation amount of each virtual router example data to be forwarded to the interference caused simultaneously, significant for the high efficiency and the stability that improve the virtual network data retransmission.
The accompanying drawing explanation
Fig. 1 is the applicable typical virtual network environment of unified retransmission technique.
Fig. 2 is for supporting the virtual router structure of unified forwarding engine, and the dotted arrow indication is virtual network transfer of data route, and the solid arrow indication is for transmitting the communication route.
Fig. 3 transmits structure for sharing.
Fig. 4 is for adopting the virtual network example of unified retransmission technique.
Fig. 5 is the virtual network grouping transmission flow in Fig. 4.
Fig. 6 is that VR1 in Fig. 4 shares and transmits.
Fig. 7 is that VR2 in Fig. 4 shares and transmits.
Fig. 8 is that VR3 in Fig. 4 shares and transmits.
Embodiment
Describe embodiments of the present invention in detail below in conjunction with drawings and Examples.
The data of a kind of virtual network router of the present invention are unified retransmission method, are mainly that the control plane of virtual router example is separated with datum plane, and control plane operates in each virtual router example inside, are responsible for route and calculate; Datum plane is transferred in the virtual router kernel, the datum plane of each virtual router example forms data at the virtual router device bottom and unifies forwarding engine, unified forwarding engine is responsible for transmit tissue one of the boil down to of each virtual router example are shared and transmitted, and the data retransmission of all examples on responsible this virtual router node on this basis.Support the virtual router structure of unified forwarding engine as shown in Figure 2.
Specifically, the implementation step of present technique is as follows:
(1) control plane of each virtual router example operation Routing Protocol, dynamic generating forward list item, and will transmit and be sent to data and unify forwarding engine by certain communication mechanism;
(2) data are unified forwarding engine and are responsible for that transmitting of each example is organized into to one and share and to transmit;
(3), when the packet on virtual network is arranged arrives virtual router device, proceed as follows:
A) obtain data message decapsulation from physical network card, obtain inner virtual network packet;
B) take virtual router example number that virtual network divides into groups corresponding and the destination address field (DAF) of grouping is foundation, in the routing message searching module of unified forwarding engine, carries out route querying;
C), after searching end, minute component three classes are processed: if the destination address of grouping is each virtual router example, it is submitted to corresponding virtual router example through virtual switch; If the host address that the destination address of grouping is equipment, give transport layer process on dividing into groups; The virtual network grouping forwarded for needs, after according to route searching result, grouping being carried out to the IP encapsulation, be sent to down hop virtual router example by it through physical network card.
In the present invention, share the organizational technology transmitted and be described as follows:
Building the shared key of transmitting is transmitting of each virtual router example.These are transmitted by the Routing Protocol moved in each virtual router example and dynamically generate, and the size of transmitting, structure depend on the scale of its affiliated virtual network and the Routing Protocol adopted.When each virtual network adopts identical network layer protocol, these can be transmitted and be organized into shared transmitting, realize the unified index to respectively transmitting.Sharing and to transmit structure and be comprised of three parts, is respectively the trie tree, shares transmitting of concordance list and each virtual router example, as shown in Figure 3.Take IP network as example, the IP address prefix of Trie tree for organizing each virtual router example to transmit, it adopts the mode of level compression, and each node comprises 2
nindividual branch (1≤n≤32), can mean the n bit in the IP address.Each branch on the Trie tree node points to a shared concordance list.Share concordance list using the numbering of each virtual router example as keyword, come this trie tree prefix branch position in corresponding virtual router example is transmitted of index.Transmitting of each virtual router example transmitted and expanded common router, increased the Origin And Destination information of down hop virtual link in list item.
The present invention is described in detail below with employing as shown in Figure 4, to unify the small-sized virtual network environment of retransmission technique.In this environment, three virtual router device VR1, VR2 and VR3 are respectively by three physical router equipment R1, R2 and R3 access physical network.All support two virtual router examples (VRI1, VRI2 in Fig. 4) on every virtual router device, between the VRI1 on VR1, the VRI2 on VR2 and the VRI1 on VR3, by the tunnel encapsulation technology, set up virtual link, form virtual network VNet1; Set up virtual link by the tunnel encapsulation technology between the VRI2 on VR1, the VRI1 on VR2 and the VRI2 on VR3, form virtual network VNet2.PC1 and PC2 are the user terminal on VNet1, by the VRI1 on VR1, VRI1 access of virtual network VNet1 on VR3, communicate respectively.It is example that the PC1 of take sends packet to PC2, and from the visual angle of virtual network, grouping, from PC1 sends, is forwarded to VRI1, the VRI2 on VR2, the VRI1 on VR3 on VR1 successively, finally arrives PC2.The respond packet of PC2 arrives PC1 in the other direction along same paths.Because all having disposed data, VR1, VR2 and VR3 unify forwarding engine, so can replace VRI1, VRI2 to provide the data retransmission service with VRI3 for communicating by letter between two PC.
The idiographic flow that in Fig. 4, PC1 divides into groups to the PC2 transmission as shown in Figure 5.At first, PC1 sends a virtual network grouping (1. Fig. 5 divides into groups) to VR1, VR1 is after physical network card receives grouping, searching VR1 according to grouping destination address 7.0.0.2 and virtual router example number 1 shares and transmits, as shown in Figure 6, first travel through the trie tree from top to bottom, finding with the longest-prefix that index is arranged of 7.0.0.2 coupling is 7.0.0.0/24, search thus corresponding shared concordance list, learn the position of this prefix in VRI1 transmits, thus obtain down hop through IP address 2.0.0.2 and the end address 4.0.0.2 of virtual link.Afterwards, to this virtual network, grouping is encapsulated VR1, the source address of encapsulation header is made as to the initial address of virtual link, and destination address is made as the end address of virtual link, and upgrade ttl value and verification and.Then, kernel upgrades the mac address information of buffered packet, and after encapsulating, grouping (2. Fig. 5 divides into groups) directly sends from physical network card.After encapsulation, grouping forwards arrival VR2 through physical router R1 and R2, the VR2 decapsulation of dividing into groups, what from the destination address of encapsulation header, obtain the virtual router example is numbered 2, then searching in the same way VR2 according to the destination address 7.0.0.2 of internal virtual network packet and virtual router example number 2 shares and transmits, as shown in Figure 7, obtain down hop institute through virtual link information the grouping of Reseal virtual network, the source address of encapsulation header and destination address are made as respectively 4.0.0.2 and 3. 6.0.0.2(Fig. 5 divides into groups).Encapsulating packets is sent by R2, R3 and is arrived VR3 from VR2, VR3 will divide into groups after decapsulation, searching VR3 according to the destination address 7.0.0.2 of internal virtual network packet and the virtual router example number 1 that obtains from the encapsulation header destination address shares and transmits, as shown in Figure 8, find PC2 and lay oneself open to the same network segment, therefore directly 4. the virtual network grouping being sent to PC2(Fig. 5 grouping).So just completed the transmission of virtual network grouping from PC1 to PC2.
Claims (7)
1. the data of a virtual network router are unified retransmission method, it is characterized in that, the control plane of virtual router example is separated with datum plane, and control plane operates in each virtual router example inside, are responsible for route and calculate; Datum plane is transferred in the virtual router kernel, the datum plane of each virtual router example forms data at the virtual router device bottom and unifies forwarding engine, unify forwarding engine by this and be responsible for transmit one of tissue the boil down to of each virtual router example are shared and transmitted, and be responsible on this basis the data retransmission of all examples on this virtual router node.
2. the data of virtual network router according to claim 1 are unified retransmission method, it is characterized in that, and the control plane of each virtual router example operation Routing Protocol, dynamic generating forward list item, and will transmit and be sent to described data and unify forwarding engine.
3. the data of virtual network router according to claim 1 are unified retransmission method, it is characterized in that, described data are unified the set that forwarding engine can be considered datum plane in former each virtual router example, the all functions that possess the general data plane, it is responsible for virtual router examples all on virtual router unified data retransmission service is provided, and it forwards according to transmitting for the shared of routing message searching module in engine; The control plane of each virtual router example moves respectively Routing Protocol separately and generates and transmits, respectively transmitting information exchange crosses the virtual router example and unifies communicating by letter between forwarding engine with data and regularly sent to data to unify forwarding engine, be organized as to share in engine and transmit, unify in forwarding engine thereby the information of transmitting of original a plurality of datum planes is incorporated into to data.
4. the data of virtual network router according to claim 1 are unified retransmission method, it is characterized in that, by building the trie tree, the prefix of transmitting of each virtual router example is unified to index, thereby transmitting of a plurality of virtual router examples is organized into to shared transmitting, share and to transmit structure and set by trie, three parts of transmitting of sharing concordance list and each virtual router example form, wherein the trie tree is used for the address prefix of organizing each virtual router example to transmit, the trie tree node that comprises effective prefix information will point to a shared concordance list, should share concordance list using the numbering of each virtual router example as keyword, come the position of this prefix node of index in corresponding virtual router example is transmitted.
5. the data of virtual network router according to claim 4 are unified retransmission method, it is characterized in that, when each virtual router example all adopts IP network, the IP address prefix of trie tree for organizing each virtual router example to transmit, it adopts the mode of level compression, and each node comprises 2
nindividual branch, wherein 1≤n≤32, can mean the n bit in the IP address; Trie sets each node that comprises effective prefix information and points to a shared concordance list, share concordance list using the numbering of each virtual router example as keyword, come the position of prefix in corresponding virtual router example is transmitted of this trie tree node representative of index, transmitting of each virtual router example transmitted and expanded common router, increased the Origin And Destination information of down hop virtual link in list item.
6. the data of virtual network router according to claim 1 are unified retransmission method, it is characterized in that, when the packet on virtual network is arranged arrives virtual router device, proceed as follows:
A) obtain data message decapsulation from physical network card, obtain inner virtual network packet;
B) take virtual router example number corresponding to virtual network packet and destination address field (DAF) is foundation, within described data are unified the routing message searching module of forwarding engine, carries out route querying;
C), after searching end, packet divides three classes to process: if the destination address of packet is each virtual router example, it is submitted to corresponding virtual router example through virtual switch; If the host address that the destination address of packet is equipment, will give transport layer process in packet; The virtual network packet forwarded for needs, after the IP encapsulation is carried out in grouping to data according to route searching result, be sent to down hop virtual router example by it through physical network card.
7. the data of virtual network router according to claim 6 are unified retransmission method, it is characterized in that, described routing message searching module is the core that data are unified forwarding engine, for setting up to share, transmit, the foundation of as each virtual network packet, carrying out route querying, mutual with other module in engine, obtain each virtual router example information, and operated sharing to transmit.
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