CN102857416A - Method for implementing virtual network and virtual network - Google Patents

Method for implementing virtual network and virtual network Download PDF

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Publication number
CN102857416A
CN102857416A CN2012103464579A CN201210346457A CN102857416A CN 102857416 A CN102857416 A CN 102857416A CN 2012103464579 A CN2012103464579 A CN 2012103464579A CN 201210346457 A CN201210346457 A CN 201210346457A CN 102857416 A CN102857416 A CN 102857416A
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China
Prior art keywords
packet
subnet
sign
access switch
controller
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CN2012103464579A
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Chinese (zh)
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CN102857416B (en
Inventor
马苏安
汪军
胡永生
梁亮
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中兴通讯股份有限公司
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Priority to CN201210346457.9A priority Critical patent/CN102857416B/en
Publication of CN102857416A publication Critical patent/CN102857416A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/64Hybrid switching systems
    • H04L12/6418Hybrid transport

Abstract

The embodiment of the invention provides a method for implementing a virtual network and the virtual network. The method comprises the following g steps: step (1), obtaining a transfer type, a source and a destination of a data packet sent by a host computer by a controller of the virtual network; step (2), formulating a forwarding strategy according to the transfer type, a port identifier of the source and a target identifier of the destination; and step (3), sending the forwarding strategy to each virtual access exchanger and each middle exchanger through which the data packet is to be passed, and executing the forwarding strategy to the received data packet received by the virtual access exchanger and the middle exchanger. In the forwarding process of the data packet, the controller can obtain various attributes of the data packet as target identifiers, formulate the forwarding strategy according to the target identifiers and forward the data packet more intensively and flexibly; and multi-user and multi-path forwarding is supported, flow load is balanced, and network resources are utilized more efficiently.

Description

A kind of method and virtual network that realizes virtual network

Technical field

The present invention relates to Data Interchange Technology, refer to especially a kind of method and virtual network that realizes virtual network.

Background technology

Data center provides the resource letting, and for different tenants, data center need to provide a virtual network to realize exchanges data, makes tenant's non-interfering use resource in virtual network.Simultaneously, the development of data center's business makes data center day by day improve the requirement of network, needs larger bandwidth, more reliable data network.

Tenant's quantity may reach hundreds thousand of more than, in the prior art, general VLAN (the vLan that adopts, Virtual Local Area Network) isolates the tenant, because the number of vLan is 4096 to the maximum, thereby limited tenant's quantity, can not satisfy data center provides professional demand for many tenants.As shown in Figure 1, at the IP network double layer network that superposes, Ethernet sealed be contained in the UDP bag, adds a VXLan packet header, the VXLan network identity of 24 of interpolations is to distinguish different virtual networks in the packet header; UDP bag forward-path is determined by Routing Protocol; This mode can be supported a large amount of tenants, and the multipath support relies on lower floor's IP network to realize.In the IP network 106, raw data packets 101 sends to Path end point (VTEP from source Host104, VXLAN tunnel end point) 105, VTEP is encapsulated in raw data packets 101 packet 102 that forms in the UDP bag after encapsulating, additional VXLan Header in packet 102, VXLan Header inside comprises a VNI (VXLan Network IDentifier) and identifies different virtual networks.Packet 102 after the encapsulation sends to opposite end VTEP by IP network 106, and the VTEP decapsulation restores raw data packets 103, is transmitted to purpose Host107 again.Can find out, after the UDP bag is advanced in raw data packets 101 encapsulation, the bottom IP network is transmitted it as load, can not identify raw data packets 101 and belong to which tenant, can not identify the information such as IP address of raw data packets 101 inside, thereby, can not do any optimization and control according to these information.

There are the following problems for prior art: the bottom IP network is separated with virtual network, when the packet of virtual network transmits in the bottom IP network, IP network can not the recognition data bag information of inner encapsulation, can not implement Optimized Measures or other strategies for tenant's demand; Virtual network is the pass-through mode of nonrecognition packet in the bottom IP network also, can't control repeating process.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of method and virtual network that realizes virtual network, solve because the bottom IP network is separated with virtual network, when the packet of virtual network transmits in the bottom IP network, IP network can not the recognition data bag information of inner encapsulation, can not implement to optimize or other strategies for tenant's demand; Virtual network is the pass-through mode of nonrecognition packet in the bottom IP network also, the defective that can't control repeating process.

For solving the problems of the technologies described above, embodiments of the invention provide a kind of method that realizes virtual network, comprising: step 1, and the controller of virtual network obtains the transmission type of the packet that is sent by main frame, source place and destination; Step 2 is formulated forwarding strategy according to the port-mark in described transmission type, source place, the purpose sign of destination; Step 3 sends to each virtual access switch and intermediary switch that described packet will pass through with described forwarding strategy; The packet to receiving by described virtual access switch and intermediary switch is carried out described forwarding strategy.

In the described method, carry out described forwarding strategy and comprise: with the packet that receives as the first packet, will described purpose sign with described the first packet encapsulation after form the second packet; Send described the second packet.

In the described method, described transmission type is forwarding data bag in the same subnet; Send the main frame of packet and the destination host of receive data bag and be positioned at same subnet; Described purpose sign comprises: the purpose virtual network sign of the main frame place subnet of the transmission packet of determining according to described port-mark, and the purpose Route Distinguisher of purpose virtual access switch.

In the described method, described transmission type is forwarding data bag between the subnet; Described purpose sign comprises: the purpose virtual network sign of purpose subnet, and the purpose Route Distinguisher of purpose virtual access switch.

In the described method, transmission type is clean culture; Step 2 also comprises: calculate the main frame of transmission packet and at least one path optimizing between the destination; Comprise described at least one path optimizing in the described forwarding strategy; Carrying out described forwarding strategy comprises: the purpose virtual access switch by described purpose subnet is reduced to the first packet with described the second packet, and described the first packet after the reduction is issued destination host.

In the described method, described transmission type is broadcasting; Comprise before the step 1: in each subnet, set up the first kind broadcasting tree that covers whole described subnet; Perhaps, in each subnet, set up Equations of The Second Kind broadcasting tree, in each described Equations of The Second Kind broadcasting tree, in the selected described subnet one root node that has the virtual access switch that is connected to set as this Equations of The Second Kind broadcasting with main frame.

In the described method, described purpose sign comprises: the purpose sign of the purpose subnet that the first kind broadcasting tree of destination or Equations of The Second Kind broadcasting tree are corresponding; Carrying out described forwarding strategy comprises: the purpose virtual access switch by described purpose subnet is reduced to the first packet with described the second packet, and described the first packet is issued destination host.

In the described method, described controller adopts the Openflow agreement to issue described forwarding strategy; Described forwarding strategy is realized by the stream table; Perhaps, described controller adopts the network management interface download protocol to issue described forwarding strategy; Described forwarding strategy is realized by the network management configuration clauses and subclauses; Perhaps, described controller adopts selected proprietary protocol to issue described forwarding strategy.

A kind of controller comprises: information acquisition unit, for the transmission type of obtaining the packet that is sent by main frame, source place and destination; The policy development unit is used for the port-mark according to described transmission type, source place, the purpose sign formulation forwarding strategy of destination; The policy distribution unit is used for described forwarding strategy is sent to each described virtual access switch and intermediary switch that described packet will pass through; By described virtual access switch and intermediary switch the packet that receives is carried out described forwarding strategy.

In the described controller, the policy development unit comprises: first formulates module, during for forwarding data bag in described transmission type is same subnet; Described purpose sign is set to be comprised: the purpose virtual network sign of the main frame place subnet of the transmission packet of determining according to described port-mark, and the purpose Route Distinguisher of purpose virtual access switch.

In the described controller, the policy development unit comprises: second formulates module, be used for when described transmission type be between the subnet during forwarding data bag, described purpose sign is set comprises: the purpose virtual network of purpose subnet identifies, and the purpose Route Distinguisher of purpose virtual access switch.

In the described controller, the policy development unit comprises: the 3rd formulates module, is used for when described transmission type is clean culture, calculates the main frame of transmission packet and at least one path optimizing between the destination; Comprise described at least one path optimizing in the described forwarding strategy.

In the described controller, also comprise: broadcasting tree unit is used for setting up the first kind broadcasting tree that covers whole described subnet at each subnet; Perhaps, in each subnet, set up Equations of The Second Kind broadcasting tree, in each described Equations of The Second Kind broadcasting tree, in the selected described subnet one root node that has the virtual access switch that is connected to set as this Equations of The Second Kind broadcasting with main frame.

In the described controller, the policy development unit comprises: the 4th formulates module, is used for when described transmission type is broadcasting, and described purpose sign is set comprises: the first kind broadcasting tree of destination or Equations of The Second Kind are broadcasted the purpose sign of purpose subnet corresponding to tree.

A kind of virtual network comprises: virtual access switch, intermediary switch and controller; Each virtual access switch has a Route Distinguisher, and is connected with described controller; Each intermediary switch is connected with the virtual access switch, and is connected with described controller; Each main frame all is arranged in a subnet, and the All hosts in the subnet is in a L 2 broadcast territory, and the L 2 broadcast territory has the virtual network sign; One in main frame is connected by port with the virtual access switch, and port has port-mark; Also comprise controller, controller comprises: information acquisition unit, for the transmission type of obtaining the packet that is sent by main frame, source place and destination; The policy development unit is used for the port-mark according to described transmission type, source place, the purpose sign formulation forwarding strategy of destination; The policy distribution unit is used for described forwarding strategy is sent to each described virtual access switch and intermediary switch that described packet will pass through; By described virtual access switch and intermediary switch the packet that receives is carried out described forwarding strategy.

In the described virtual network, the virtual access switch comprises: the first strategy execution unit, the packet that is used for receiving will form the second packet after described purpose sign and described the first packet encapsulation as the first packet; Send described the second packet; And the second intermediary switch comprises: strategy execution unit, the packet that is used for receiving will form the second packet after described purpose sign and described the first packet encapsulation as the first packet; Send described the second packet.

The beneficial effect of technique scheme of the present invention is as follows: in the package forward process, controller can obtain the various attributes of packet, identify as purpose such as Broadcast ID, Route ID, ethernet packet header, IP packet header, TCP/UDP port numbers etc., formulate forwarding strategy according to purpose sign, meticulousr and forwarding data bag flexibly; Supported that many tenants, multipath are transmitted, flow load balance, the more effective Internet resources that utilized.

Description of drawings

Fig. 1 represents the operation principle schematic diagram of existing vxLan technology;

Fig. 2 represents the system architecture diagram of virtual network of the present invention;

Fig. 3 represents packet encapsulation structural representation of the present invention;

Fig. 4 represents routing function schematic diagram between subnet of the present invention;

Fig. 5 represents clean culture schematic diagram in the subnet of the present invention;

Fig. 6 represents realization optimal path flow chart of the present invention;

Fig. 7 represents broadcasting flow chart in the subnet of the present invention;

Fig. 8 represents the structural representation of a kind of controller of the present invention.

Embodiment

For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.

Software defined network (SDN, Software Defined Network) technology is a kind of communication network implementation method, and core concept is control-forwarding-separation.The chain of command of SDN is comprised of the controller (Forwarding Policy Server) of concentrating, and the behavior by Open flow agreement control forwarding face, control mode is to issue the stream table, the stream table comprises matched rule and behavior, the behavior that the packet that indication and matched rule are complementary should be taked.After the forwarding face of SDN was received packet, coupling stream list item was found to carry out corresponding instruction behind the occurrence in order; If coupling can with package forward to controller, not processed by controller.

The tenant can have a plurality of subnets, every main frame (Host) of tenant all belongs to certain subnet, subnet is as a L 2 broadcast territory, and each L 2 broadcast territory is assigned a virtual network sign Broadcast ID and (is called again: the broadcast domain sign).Every main frame is connected on the port of a virtual access switch (Virtual Access Switch), each port has a unique port-mark, and each Virtual Access Switch distributes a Route Distinguisher Route ID by controller.

The embodiment of the invention provides a kind of method that realizes virtual network, as shown in Figure 2, comprising:

Step 1, the controller of virtual network obtains the transmission type of the packet that is sent by main frame, source place and destination;

Step 2 is formulated forwarding strategy according to the port-mark in described transmission type, source place, the purpose sign of destination;

Step 3 sends to each virtual access switch and intermediary switch that described packet will pass through with described forwarding strategy;

The packet to receiving by described virtual access switch and intermediary switch is carried out described forwarding strategy.

Use the technology that the embodiment of the invention provides, in the package forward process, controller can obtain the various attributes of packet, identify as purpose such as Broadcast ID, Route ID, ethernet packet header, IP packet header, TCP/UDP port numbers etc., formulate forwarding strategy according to purpose sign, the meticulousr and forwarding data bag flexibly by forwarding face; Supported that many tenants, multipath are transmitted, flow load balance, the more effective Internet resources that utilized.

The structure of virtual network as shown in Figure 2, virtual network comprises forwarding face and chain of command:

Forwarding face comprises virtual access switch 202 and intermediary switch 206; Intermediary switch 206 does not directly connect main frame 203, forwarding data bag in the middle of being responsible for.Main frame 203 is by virtual access switch 202 access of virtual networks, and main frame 203 comprises physical machine and virtual machine.

Chain of command comprises controller 201, and it and virtual access switch 202 and intermediary switch 206 are interconnected, issue forwarding strategy to virtual access switch 202 and intermediary switch 206, with the forwarding behavior of control forwarding face; Forwarding strategy comprises that the control packet is from the attribute of which concrete port repeat, Update Table bag etc.

The operation principle of each device comprises in the virtual network:

Controller 201, the equipment of composition control face, the control logic of whole virtual network is all formulated at controller 201,201 pairs of network events from the face of forwarding of controller respond, issue forwarding strategy on each virtual access switch 202 and intermediary switch 206 according to the virtual network demand, to realize the control to whole virtual network.

Virtual access switch 202 is the equipment that forms forwarding face, is responsible for main frame 203 is linked into virtual network.

Intermediary switch 206 is the equipment that forms forwarding face, is the intermediate node of virtual network, not direct access host 203.The forwarding strategy that virtual access switch 202 and intermediary switch 206 are downloaded according to controller 201 is transmitted packet.

Main frame 203, each main frame 203 is connected on the port of a virtual access switch 202.

The interface 204 of controller 201 and the face of forwarding can adopt open flows (Openflow) agreement, network management protocol or proprietary protocol.

Virtual machine manager (VM Manager) 205 is in charge of main frame 203, with the information of main frame 203-comprise the port-mark of Broadcast ID, place port, and Route ID etc., send controller 201 to.

The sign of main frame 203, port-mark, and the virtual network of the subnet under the main frame 203 sign, and the corresponding relation between them all is stored in the controller 201.

In the various attributes of packet, the purpose sign comprises virtual network sign Broadcast ID at least, can also comprise purpose Route Distinguisher Route ID.

The source place refers to send the source host of packet, the subnet at source host place;

The destination refers to the destination host of receive data bag, the subnet at destination host place.

In a preferred embodiment, these information such as virtual management platform (VM Manager), send controller 201 by interface 204 by other system.

When packet enters virtual network, stamp virtual network sign, Route Distinguisher; Packet is in the virtual network transmission course, and forwarding face is transmitted according to the Route Distinguisher of packet; Forwarding face is distinguished different virtual networks according to the virtual network sign of packet, Packet Generation can only be given the main frame of same virtual network.

The packaged type of packet as shown in Figure 3, the packet 301 that source host 304 sends, comprise two layers of packet header (L2Header) and data (Data), be encapsulated as packet 302 at virtual access switch 202, in this process, adopt in esse web tab, realize Broadcast ID and Route ID such as MPLS 20bit label, being packaged together with packet 301 forms packet 302, and formation packet 303 perhaps only is packaged together Broadcast ID and packet 301; Broadcast ID and Route ID represent respectively virtual network sign and purpose virtual access switch 202b; The MPLS label does not have MPLS tag meaning originally only as the carrier of Broadcast ID and Route ID at this moment.The Broadcast ID of 20bit can support to surpass 1,000,000 separate subnets, therefore can support a large amount of tenants.

After purpose virtual access switch 202b receives packet 302, remove the packet 304 of Broadcast ID and Route ID, returned to the state of initial packet 301, send to destination host 305.

Broadcast data packet 303 is owing to being not specifically to be transmitted to specific Host, but issues all Host in the broadcast domain, so do not need to encapsulate Route ID, only encapsulates Broadcast ID.

Interface 204 agreements between controller 201 and the forwarding face can have multiple choices, and as adopting the Openflow agreement, forwarding strategy is realized by the stream table; Also can adopt the network management interface download policy, forwarding strategy is realized by the network management configuration clauses and subclauses.

In a preferred embodiment, controller 201 adopts the Openflow agreement to issue described forwarding strategy; Described forwarding strategy is realized by the stream table;

Perhaps,

Described controller adopts the network management interface download protocol to issue described forwarding strategy; Described forwarding strategy is realized by the network management configuration clauses and subclauses;

Perhaps,

Described controller adopts proprietary protocol to issue described forwarding strategy.

In a preferred embodiment, carrying out described forwarding strategy comprises:

With the packet that receives as the first packet, will described purpose sign with described the first packet encapsulation after form the second packet;

Send described the second packet.

The technical scheme that provides can be in same subnet the forwarding data bag.

In a preferred embodiment, described transmission type is forwarding data bag in the same subnet;

Described purpose sign comprises: the purpose virtual network sign Broadcast ID of the main frame place subnet of the transmission packet of finding out according to described port-mark, and the purpose Route Distinguisher Route ID of purpose virtual access switch.

In an application scenarios, when virtual network repeating data bag, controller 201 is that packet is stamped two kinds of purpose signs: Broadcast ID and Route ID by the forwarding strategy that issues.

Step 01, when main frame sent packet, controller 201 was found out Broadcast ID corresponding to main frame place subnet according to main frame place interface querying database, and the purpose Route Distinguisher Route ID of purpose virtual access switch, form forwarding strategy with this;

Step 02, controller 201 issue the first virtual access switch that forwarding strategy connects to main frame, and intermediary switch, and intermediary switch is connected with the first virtual access switch or other intermediary switch.

Step 03 turns formation the second packet in the first packet with Broadcast ID and Route ID envelope when carrying out forwarding strategy.

Which virtual network transmits in same subnet and need to stamp virtual network sign Broadcast ID, be otherwise just can't distinguish this packet.When transmitting in subnet with the second packet of Broadcast ID and Route ID, intermediary switch is mated this purpose sign, guarantee that this packet only can be dealt into the destination host in the same subnet, realize isolation between in same subnet the transmission of data bag and the subnet with this.

The technical scheme that provides can be between different subnets the forwarding data bag.The virtual network sign of the virtual network at encapsulation destination host place in packet is to guarantee the only having main frame in the purpose virtual network can receive this packet.

In a preferred embodiment, transmission type is forwarding data bag between the subnet;

The purpose sign comprises: the purpose virtual network sign of purpose subnet, and the purpose Route Distinguisher Route ID of purpose virtual access switch.Purpose virtual access switch is positioned at the purpose subnet.

Clean culture flow process in the similar subnet of routing procedure between subnet, different is, route is wanted the Mac address of replacement data bag between subnet, this be because of: when packet sent, Mac address, source was the Mac address of source host, and purpose Mac address is router Mac address; Wherein, router Mac address is the MAC Address (not being the Mac address of virtual access switch 202a) of the router of host configuration, the router of host configuration is virtual, each main frame meeting configuration router IP address, when main frame will send packet between subnet, main frame can obtain Mac address corresponding to this accessor by the ARP agreement, and controller replaces virtual router to reply this ARP request 201 this moments, returns the router Mac address of virtual router to main frame.

Packet is through the virtual access switch, and Mac address, source replaces with router Mac address, and purpose Mac address replaces with destination host Mac address.Need to arrange a virtual router address in this process, but physical router need be set, only finish routing function by the replacement of Mac address.

In an application scenarios, as shown in Figure 4, describe as example as the interface protocol between controller 201 and the forwarding face take the openflow agreement, the defined stream table of the corresponding openflow agreement of forwarding strategy, step comprises:

Step 401, source host send the first packet to the source virtual access switch 202a that links to each other with it.

Step 402, source virtual access switch 202a is transmitted to controller 201 with the first packet by PacketIn message owing to there not being the stream table of coupling.

Step 403, controller 201 issues the stream table to source virtual access switch 202a, the stream table is responsible for encapsulation Broadcast ID, Route ID and is replaced the Mac address, and comprising: Mac address, source is replaced with router Mac address, and destination address replaces with destination host Mac address.

Step 404, controller 201 issues the stream table to purpose virtual access switch 202b, these stream tables are responsible for ejecting Broadcast ID and Route ID realizing the restoring data bag from the second packet that receives, and transmit packet after the reduction to suitable destination host.

Step 405, controller 201 sends back to source virtual access switch 202a with the first packet by PacketOut message.

Step 406, the stream table of mentioning in the source virtual access switch 202a coupling step 403 is given packet encapsulation Broadcast ID and Route ID, and Mac address, source is replaced with router Mac address, destination address replaces with destination host Mac address, forms the second packet.

Step 407, the stream table of mentioning in the source virtual access switch 202a coupling step 403 is transmitted the second packet by optimal path.

Step 408, intermediary switch 206 coupling stream tables are transmitted the second packet by optimal path.

Step 409, the stream table of mentioning in the purpose virtual access switch 202b coupling step 404 ejects Broadcast ID and Route ID, restores the first packet from the second packet;

Step 410, purpose virtual access switch 202b coupling stream table is transmitted the first packet to destination host.

The technical scheme that provides also can be transmitted the packet of clean culture.

In a preferred embodiment, transmission type is clean culture;

Step 2 also comprises: calculate the main frame of transmission packet and at least one path optimizing between the destination; Comprise described at least one path optimizing in the described forwarding strategy;

Carrying out described forwarding strategy comprises: the purpose virtual access switch by described purpose subnet is reduced to the first packet with described the second packet, and described the first packet is issued destination host.

When main frame sent unicast packet, the Route ID of controller 201 inquiry destination host place virtual access switches issued corresponding forwarding strategy, when the virtual access switch is carried out forwarding strategy this Route ID is encapsulated in the packet.

Controller 201 calculates optimal path between per two virtual access switches, and issue forwarding strategy, Route ID in the forwarding strategy matched data bag, it is transmitted along particular path, until arrive purpose virtual access switch 202b, 202b is transmitted to destination host by purpose virtual access switch.

Controller 201 also can calculate mulitpath simultaneously, allows current packet select a paths to transmit by predefined forwarding strategy, thereby realizes load balance.Determine to adopt different pass-through modes by controller 201, can determine at any time as required different selections.

Unicast packet need to be stamped Broadcast ID and Route ID in the subnet, these two signs are all realized by the MPLS label, Route ID is used for recognition purpose virtual access switch 202b, Broadcast ID is used for a L 2 broadcast territory of unique identification (subnet), guarantee that the main frame in the same subnet just can receive this packet, realize well the isolation between the subnet.

In an application scenarios, as shown in Figure 5, describe as the interface protocol between controller 201 and the forwarding face with the openflow agreement, the stream table of the corresponding openflow protocol definition of forwarding strategy, step comprises:

Step 501, source host send the first packet to the source virtual access switch 202a that links to each other with it.

Step 502, the first packet do not have the stream table of coupling at source virtual access switch 202a, source virtual access switch 202a sends PacketIn message to controller 201, and message comprises content and the input port of the first packet.

Step 503, controller 201 are judged the stream table of needs coupling according to the content of PacketIn message, 202a issues the stream table to source virtual access switch, and these stream tables are responsible for encapsulation Broadcast ID and Route ID;

Step 504, controller 201 issues the stream table to purpose virtual access switch 202b, and these stream tables are responsible for ejecting Broadcast ID and Route ID from the second packet, and transmit the first packet to suitable main frame;

The stream table can be downloaded when receiving PacketIn message, also can be chosen in to download before main frame sends packet.

Step 505, controller 201 sends back to source virtual access switch 202a with former packet by PacketOut message;

Step 506, source virtual access switch 202a carries out the behavior of stream table regulation with this data packet matched stream table, forms the second packet for the first packet encapsulation Broadcast ID and Route ID;

Step 507, source virtual access switch 202a coupling stream table is transmitted the second packet by optimal path;

Step 508, intermediary switch 206 coupling stream tables are transmitted the second packet by optimal path;

Step 509, purpose virtual access switch 202b ejects Broadcast ID and Route ID with the second data packet matched stream table from the second packet, restore the first packet;

Step 510, purpose virtual access switch 202b coupling stream table, the first packet after the forwarding reduction is to destination host.

Each packet adopts optimal path to transmit, also can transmit according to specific policy corresponding to tenant, particularly, can select different routed paths according to the rank under the tenant, need to corresponding stream table be set each node in routed path in this process.

Among each embodiment, the mode that issues the forwarding strategy of realizing optimal path has multiple, can be when network topology structure changes, at once to issue forwarding strategy, also can calculate first optimal path, when being arranged, Packet Generation issues again forwarding strategy, as shown in Figure 6, the flow process of realization optimal path comprises:

Step 601, controller 201 are that each virtual access switch 202 distributes Route ID, and the detection network topological structure.

When adopting openflow as the agreement between chain of command and the forwarding face, controller 201 detection network topological structures comprise: controller 201 can indicate each port to send Link Layer Discovery Protocol (LLDP, Link Layer Discovery Protocol) bag, if receive this LLDP bag at another port of the face of forwarding, then thinking has a link between two ports.

Step 602 is calculated each virtual access switch 202 to the optimal path between other virtual access switches 202.

Step 603, controller 201 issues forwarding strategy to corresponding virtual access switch 202 and intermediary switch 206, the forwarding strategy indicating the described port that should export to the packet of purpose virtual access switch 202b from a virtual access switch 202, matching field is Route ID.

The technical scheme that provides also can be transmitted broadcast data packet.

In a preferred embodiment, transmission type is broadcasting;

Comprise before the step 1:

In each subnet, set up the first kind broadcasting tree that covers whole described subnet;

Perhaps, in each subnet, set up Equations of The Second Kind broadcasting tree, in each described Equations of The Second Kind broadcasting tree, in the selected described subnet one root node that has the virtual access switch that is connected to set as this Equations of The Second Kind broadcasting with main frame.

The mode of foundation broadcasting tree has multiple, can set up when sending broadcast packet and broadcast tree, also can set up in advance the broadcasting tree; Broadcasting tree can be set up one by each subnet, and the Virtual Access Switch that also can link to each other with each main frame in each subnet sets up a plurality of as root.Because the node of broadcasting tree is relevant with the position of main frame, so during the position of host machine change, rebulids the broadcasting tree, and upgrade to flow and show.

In a preferred embodiment, the purpose sign comprises: the purpose sign of the purpose subnet that the first kind broadcasting tree of destination or Equations of The Second Kind broadcasting tree are corresponding;

Carrying out described forwarding strategy comprises: the purpose virtual access switch by described purpose subnet is reduced to the first packet with described the second packet, and described the first packet is issued destination host.

In an application scenarios, as shown in Figure 7, broadcast packet need to encapsulate the Broadcast ID that is realized by the MPLS label in the subnet.Take the openflow agreement as controller 201 and forwarding face between interface protocol describe the stream table of the corresponding openflow protocol definition of forwarding strategy as example.Controller 201 is set up a broadcasting tree by issuing the stream table, and packet is propagated by the broadcasting tree, and step comprises:

Step 701, source host send the first packet to the source virtual access switch 202a that is connected with source host.

Step 702, source virtual access switch 202a does not have the stream table of coupling, and the first packet is transmitted to controller 201 by PacketIn message.

Step 703, controller 201 issues the stream table to source virtual access switch 202a, and these stream tables are responsible for the first packet encapsulation Broadcast ID.

Step 704, controller 201 is set up the broadcasting tree according to network topology, issues the stream table according to the result who sets up the broadcasting tree to intermediary switch 206 corresponding to broadcasting tree node, and these stream tables are responsible for the second packet at broadcasting tree repeating.

Step 705, controller 201 issues the stream table to purpose virtual access switch 202b; These stream tables are responsible for ejecting Broadcast ID from the second packet, and transmit the second packet to suitable destination host.

Step 706, controller 201 sends back to source virtual access switch 202a with former the first packet by PacketOut message.

Step 707, source virtual access switch 202a coupling stream table is loaded onto Broadcast ID for the first data envelope and is formed the second packet.

Step 708, source virtual access switch 202a coupling stream table is transmitted the second packet by the broadcasting tree.

Step 709, intermediary switch 206 flow tables are by broadcasting tree forwarding data bag; Packet can arrive purpose virtual access switch 202b.

Step 710, purpose virtual access switch 202b coupling stream table ejects Broadcast ID from the second packet, restore the first packet.

Step 711, purpose virtual access switch 202b coupling stream table is transmitted the first packet to destination host.

The embodiment of the invention provides a kind of controller, as shown in Figure 8, comprising:

Information acquisition unit 801 is for the transmission type of obtaining the packet that is sent by main frame, source place and destination;

Policy development unit 802 is used for the port-mark according to described transmission type, source place, the purpose sign formulation forwarding strategy of destination;

Policy distribution unit 803 is used for described forwarding strategy is sent to each described virtual access switch and intermediary switch that described packet will pass through;

By described virtual access switch and intermediary switch the packet that receives is carried out described forwarding strategy.

In a preferred embodiment, policy development unit 802 comprises:

First formulates module, during for forwarding data bag in described transmission type is same subnet;

Described purpose sign is set to be comprised: the purpose virtual network sign of the main frame place subnet of the transmission packet of determining according to described port-mark, and the purpose Route Distinguisher of purpose virtual access switch.

In a preferred embodiment, policy development unit 802 comprises:

Second formulates module, be used for when described transmission type be between the subnet during forwarding data bag,

Described purpose sign is set to be comprised: the purpose virtual network sign of purpose subnet, and the purpose Route Distinguisher of purpose virtual access switch.

In a preferred embodiment, policy development unit 802 comprises:

The 3rd formulates module, be used for when described transmission type is clean culture,

Calculate the main frame of transmission packet and at least one path optimizing between the destination; Comprise described at least one path optimizing in the described forwarding strategy.

In a preferred embodiment, also comprise:

Broadcasting tree unit is used for setting up the first kind broadcasting tree that covers whole described subnet at each subnet;

Perhaps, in each subnet, set up Equations of The Second Kind broadcasting tree, in each described Equations of The Second Kind broadcasting tree, in the selected described subnet one root node that has the virtual access switch that is connected to set as this Equations of The Second Kind broadcasting with main frame.

In a preferred embodiment, policy development unit 802 comprises:

The 4th formulates module, be used for when described transmission type is broadcasting,

Described purpose sign is set to be comprised: the purpose sign of the purpose subnet that the first kind broadcasting tree of destination or Equations of The Second Kind broadcasting tree are corresponding.

The embodiment of the invention provides a kind of virtual network, as shown in Figure 2, comprising: virtual access switch, intermediary switch and controller;

Each virtual access switch has a Route Distinguisher, and is connected with described controller;

Each intermediary switch is connected with the virtual access switch, and is connected with described controller;

Each main frame all is arranged in a subnet, and the All hosts in the subnet is in a L 2 broadcast territory, and the L 2 broadcast territory has the virtual network sign;

One in main frame is connected by port with the virtual access switch, and port has port-mark;

Also comprise controller, as shown in Figure 8, in the controller:

Information acquisition unit 801 is for the transmission type of obtaining the packet that is sent by main frame, source place and destination;

Policy development unit 802 is used for the port-mark according to described transmission type, source place, the purpose sign formulation forwarding strategy of destination;

Policy distribution unit 803 is used for described forwarding strategy is sent to each described virtual access switch and intermediary switch that described packet will pass through;

By described virtual access switch and intermediary switch the packet that receives is carried out described forwarding strategy.

In a preferred embodiment, the virtual access switch comprises:

The first strategy execution unit, the packet that is used for receiving will form the second packet after described purpose sign and described the first packet encapsulation as the first packet; Send described the second packet;

And,

The second intermediary switch comprises:

Strategy execution unit, the packet that is used for receiving will form the second packet after described purpose sign and described the first packet encapsulation as the first packet; Send described the second packet.

Adopt this programme advantage afterwards to be: by stamp virtual network label and routing tag for packet, many tenants support, multipath, flow load balance ability are provided, and can more fully manage the data network, implement more flexibly data retransmission strategy, even implement optimization and the control of flow for specific tenant's demand.

The above is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (16)

1. a method that realizes virtual network is characterized in that, comprising:
Step 1, the controller of virtual network obtains the transmission type of the packet that is sent by main frame, source place and destination;
Step 2 is formulated forwarding strategy according to the port-mark in described transmission type, source place, the purpose sign of destination;
Step 3 sends to each virtual access switch and intermediary switch that described packet will pass through with described forwarding strategy;
The packet to receiving by described virtual access switch and intermediary switch is carried out described forwarding strategy.
2. method according to claim 1 is characterized in that, carries out described forwarding strategy and comprises:
With the packet that receives as the first packet, will described purpose sign with described the first packet encapsulation after form the second packet;
Send described the second packet.
3. method according to claim 2 is characterized in that, described transmission type is forwarding data bag in the same subnet; Send the main frame of packet and the destination host of receive data bag and be positioned at same subnet;
Described purpose sign comprises: the purpose virtual network sign of the main frame place subnet of the transmission packet of determining according to described port-mark, and the purpose Route Distinguisher of purpose virtual access switch.
4. method according to claim 2 is characterized in that, described transmission type is forwarding data bag between the subnet;
Described purpose sign comprises: the purpose virtual network sign of purpose subnet, and the purpose Route Distinguisher of purpose virtual access switch.
5. method according to claim 1 is characterized in that, described transmission type is clean culture;
Step 2 also comprises: calculate the main frame of transmission packet and at least one path optimizing between the destination; Comprise described at least one path optimizing in the described forwarding strategy;
Carrying out described forwarding strategy comprises: the purpose virtual access switch by described purpose subnet is reduced to the first packet with described the second packet, and described the first packet after the reduction is issued destination host.
6. method according to claim 1 is characterized in that, described transmission type is broadcasting;
Comprise before the step 1:
In each subnet, set up the first kind broadcasting tree that covers whole described subnet;
Perhaps, in each subnet, set up Equations of The Second Kind broadcasting tree, in each described Equations of The Second Kind broadcasting tree, in the selected described subnet one root node that has the virtual access switch that is connected to set as this Equations of The Second Kind broadcasting with main frame.
7. method according to claim 6 is characterized in that,
Described purpose sign comprises: the purpose sign of the purpose subnet that the first kind broadcasting tree of destination or Equations of The Second Kind broadcasting tree are corresponding;
Carrying out described forwarding strategy comprises: the purpose virtual access switch by described purpose subnet is reduced to the first packet with described the second packet, and described the first packet is issued destination host.
8. method according to claim 1 is characterized in that,
Described controller adopts the Openflow agreement to issue described forwarding strategy; Described forwarding strategy is realized by the stream table;
Perhaps,
Described controller adopts the network management interface download protocol to issue described forwarding strategy; Described forwarding strategy is realized by the network management configuration clauses and subclauses;
Perhaps,
Described controller adopts selected proprietary protocol to issue described forwarding strategy.
9. a controller is characterized in that, comprising:
Information acquisition unit is for the transmission type of obtaining the packet that is sent by main frame, source place and destination;
The policy development unit is used for the port-mark according to described transmission type, source place, the purpose sign formulation forwarding strategy of destination;
The policy distribution unit is used for described forwarding strategy is sent to each described virtual access switch and intermediary switch that described packet will pass through;
By described virtual access switch and intermediary switch the packet that receives is carried out described forwarding strategy.
10. controller according to claim 9 is characterized in that, the policy development unit comprises:
First formulates module, during for forwarding data bag in described transmission type is same subnet;
Described purpose sign is set to be comprised: the purpose virtual network sign of the main frame place subnet of the transmission packet of determining according to described port-mark, and the purpose Route Distinguisher of purpose virtual access switch.
11. controller according to claim 9 is characterized in that, the policy development unit comprises:
Second formulates module, be used for when described transmission type be between the subnet during forwarding data bag,
Described purpose sign is set to be comprised: the purpose virtual network sign of purpose subnet, and the purpose Route Distinguisher of purpose virtual access switch.
12. controller according to claim 9 is characterized in that, the policy development unit comprises:
The 3rd formulates module, be used for when described transmission type is clean culture,
Calculate the main frame of transmission packet and at least one path optimizing between the destination; Comprise described at least one path optimizing in the described forwarding strategy.
13. controller according to claim 9 is characterized in that, also comprises:
Broadcasting tree unit is used for setting up the first kind broadcasting tree that covers whole described subnet at each subnet;
Perhaps, in each subnet, set up Equations of The Second Kind broadcasting tree, in each described Equations of The Second Kind broadcasting tree, in the selected described subnet one root node that has the virtual access switch that is connected to set as this Equations of The Second Kind broadcasting with main frame.
14. controller according to claim 12 is characterized in that, the policy development unit comprises:
The 4th formulates module, be used for when described transmission type is broadcasting,
Described purpose sign is set to be comprised: the purpose sign of the purpose subnet that the first kind broadcasting tree of destination or Equations of The Second Kind broadcasting tree are corresponding.
15. a virtual network is characterized in that, comprising: virtual access switch, intermediary switch and controller;
Each virtual access switch has a Route Distinguisher, and is connected with described controller;
Each intermediary switch is connected with the virtual access switch, and is connected with described controller;
Each main frame all is arranged in a subnet, and the All hosts in the subnet is in a L 2 broadcast territory, and the L 2 broadcast territory has the virtual network sign;
One in main frame is connected by port with the virtual access switch, and port has port-mark;
Also comprise such as the controller in the claim 9 ~ 14.
16. virtual network according to claim 15 is characterized in that,
The virtual access switch comprises:
The first strategy execution unit, the packet that is used for receiving will form the second packet after described purpose sign and described the first packet encapsulation as the first packet; Send described the second packet;
And,
The second intermediary switch comprises:
Strategy execution unit, the packet that is used for receiving will form the second packet after described purpose sign and described the first packet encapsulation as the first packet; Send described the second packet.
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