CN102857416B - A kind of realize the method for virtual network, controller and virtual network - Google Patents

A kind of realize the method for virtual network, controller and virtual network Download PDF

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Publication number
CN102857416B
CN102857416B CN201210346457.9A CN201210346457A CN102857416B CN 102857416 B CN102857416 B CN 102857416B CN 201210346457 A CN201210346457 A CN 201210346457A CN 102857416 B CN102857416 B CN 102857416B
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China
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described
packet
purpose
subnet
virtual
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CN201210346457.9A
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Chinese (zh)
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CN102857416A (en
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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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    • 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 present invention provides a kind of method realizing virtual network and virtual network, and method includes: step one, and the controller of virtual network obtains the transmission type of the packet sent by main frame, source place and destination;Step 2, identifies according to the purpose of described transmission type, the port-mark in source place, destination and formulates forwarding strategy;Step 3, is sent to each virtual access switch and intermediary switch that described packet will pass through by described forwarding strategy;The packet to receiving by described virtual access switch and intermediary switch, performs described forwarding strategy.In packet repeating process, controller can obtain each attribute of packet and identify as purpose, formulates forwarding strategy according to purpose mark, more finely and flexibly forwards packet;Support many tenants, multipath forwards, flow load balance, more effectively make use of Internet resources.

Description

A kind of realize the method for virtual network, controller and virtual network

Technical field

The present invention relates to Data Interchange Technology, particularly relate to a kind of method realizing virtual network and virtual network.

Background technology

Data center provides resource letting, and for different tenants, data center needs to provide a virtual network to realize data exchange, makes tenant's non-interfering use resource in virtual network.Meanwhile, the development of data center traffic, make data center that the requirement of network to be improved day by day, need bigger bandwidth, more reliable data network.

The quantity of tenant is likely to be breached more than hundreds thousand of, in prior art, typically use VLAN (vLan, Virtual Local Area Network) isolate tenant, owing to the number of vLan is 4096 to the maximum, thus limit the quantity of tenant, it is impossible to meet data center provides the demand of business for many tenants.As it is shown in figure 1, on IP network superposition double layer network, by Ethernet encapsulation in UDP bag, add a VXLan packet header, packet header added the VXLan network identity of 24 to distinguish different virtual network;UDP bag forward-path is determined by Routing Protocol;This mode can support a large amount of tenant, and multipath support relies on lower floor's IP network to realize.In IP network 106, raw data packets 101 is sent to Path end point (VTEP from source Host104, VXLAN tunnel end point) 105, raw data packets 101 is encapsulated in UDP bag the packet 102 after forming encapsulation by VTEP, in packet 102, an additional VXLan Header, comprises a VNI (VXLan Network IDentifier) and identifies different virtual networks inside VXLan Header.Packet 102 after encapsulation is sent to opposite end VTEP, VTEP by IP network 106 and decapsulates, and restores raw data packets 103, relays to purpose Host107.Can be seen that, after raw data packets 101 is encapsulated into UDP bag, underlying IP network forwards as load, can not identify which tenant is raw data packets 101 belong to, the information such as IP address within raw data packets 101 can not be identified, thus, it is impossible to do any optimization and control according to these information.

There are the following problems for prior art: underlying IP network and virtual network are to separate, when the packet of virtual network transmits in underlying IP network, IP network does not identifies the information of packet enclosed inside, it is impossible to the demand for tenant implements Optimized Measures or other strategies;Virtual network also nonrecognition packet pass-through mode in underlying IP network, it is impossible to repeating process is controlled.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of method realizing virtual network and virtual network, solve to separate with virtual network due to underlying IP network, when the packet of virtual network transmits in underlying IP network, IP network does not identifies the information of packet enclosed inside, it is impossible to the demand for tenant is implemented to optimize or other strategies;Virtual network also nonrecognition packet pass-through mode in underlying IP network, it is impossible to the defect that repeating process is controlled.

For solving above-mentioned technical problem, embodiments of the invention provide a kind of method realizing virtual network, including: step one, the controller of virtual network obtains the transmission type of the packet sent by main frame, source place and destination;Step 2, identifies according to the purpose of described transmission type, the port-mark in source place, destination and formulates forwarding strategy;Step 3, is sent to each virtual access switch and intermediary switch that described packet will pass through by described forwarding strategy;The packet to receiving by described virtual access switch and intermediary switch, performs described forwarding strategy.

In described method, perform described forwarding strategy and include: using the packet that receives as the first packet, described purpose mark is formed the second packet after described first packet encapsulation;Send described second packet.

In described method, described transmission type is forwarding packet in same subnet;The main frame sending packet is positioned at same subnet with the destination host receiving packet;Described purpose mark includes: according to the purpose virtual process identifications of the main frame place subnet sending packet that described port-mark determines, and the purpose Route Distinguisher of purpose virtual access switch.

In described method, described transmission type is forwarding packet between subnet;Described purpose mark includes: the purpose virtual process identifications of purpose subnet, and the purpose Route Distinguisher of purpose virtual access switch.

In described method, transmission type is clean culture;Step 2 also includes: calculate at least one path optimizing between the main frame and the destination that send packet;Described forwarding strategy includes described at least one path optimizing;Perform described forwarding strategy to include: by the purpose virtual access switch of described purpose subnet, described second packet is reduced to the first packet, described first packet after reduction is issued destination host.

In described method, described transmission type is broadcast;Include before step one: in each subnet, set up the first kind broadcast tree covering whole described subnet;Or, each subnet to be set up Equations of The Second Kind broadcast and sets, in each described Equations of The Second Kind broadcast tree, in selected described subnet has the root node that the virtual access switch being connected is set as the broadcast of this Equations of The Second Kind with main frame.

In described method, described purpose mark includes: the purpose mark of corresponding purpose subnet is set in the first kind broadcast tree of destination or Equations of The Second Kind broadcast;Perform described forwarding strategy to include: by the purpose virtual access switch of described purpose subnet, described second packet is reduced to the first packet, described first packet is issued destination host.

In described method, described controller uses Openflow agreement to issue described forwarding strategy;Described forwarding strategy is realized by flowing table;Or, described controller uses network management interface download protocol to issue described forwarding strategy;Described forwarding strategy is realized by network management configuration entry;Or, described controller uses selected proprietary protocol to issue described forwarding strategy.

A kind of controller, including: information acquisition unit, for obtaining the transmission type of the packet sent by main frame, source place and destination;Policy development unit, identifies for the purpose according to described transmission type, the port-mark in source place, destination and formulates forwarding strategy;Policy distribution unit, for being sent to each described virtual access switch and intermediary switch that described packet will pass through by described forwarding strategy;By described virtual access switch and intermediary switch, the packet to receiving performs described forwarding strategy.

In described controller, policy development unit includes: first formulates module, for when forwarding packet in described transmission type is same subnet;Arrange described purpose mark to include: according to the purpose virtual process identifications of the main frame place subnet sending packet that described port-mark determines, and the purpose Route Distinguisher of purpose virtual access switch.

In described controller, policy development unit includes: second formulates module, for when described transmission type is to forward packet between subnet, described purpose mark is set and includes: the purpose virtual process identifications of purpose subnet, and the purpose Route Distinguisher of purpose virtual access switch.

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

In described controller, also include: broadcast tree unit, for setting up the first kind broadcast tree covering whole described subnet in each subnet;Or, each subnet to be set up Equations of The Second Kind broadcast and sets, in each described Equations of The Second Kind broadcast tree, in selected described subnet has the root node that the virtual access switch being connected is set as the broadcast of this Equations of The Second Kind with main frame.

In described controller, policy development unit includes: the 4th formulates module, for when described transmission type is for broadcasting, arranges described purpose mark and includes: the purpose mark of corresponding purpose subnet is set in the first kind broadcast tree of destination or Equations of The Second Kind broadcast.

A kind of virtual network, including: 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 virtual access switch, and is connected with described controller;Each main frame is respectively positioned in a subnet, and the All hosts in subnet is in a L 2 broadcast territory, and L 2 broadcast territory has virtual process identifications;One one, main frame is connected by port with virtual access switch, and port has port-mark;Also including controller, controller includes: information acquisition unit, for obtaining the transmission type of the packet sent by main frame, source place and destination;Policy development unit, identifies for the purpose according to described transmission type, the port-mark in source place, destination and formulates forwarding strategy;Policy distribution unit, for being sent to each described virtual access switch and intermediary switch that described packet will pass through by described forwarding strategy;By described virtual access switch and intermediary switch, the packet to receiving performs described forwarding strategy.

In described virtual network, virtual access switch includes: the first strategy execution unit, and described purpose mark, as the first packet, is formed the second packet after described first packet encapsulation by the packet being used for receiving;Send described second packet;And, the second intermediary switch includes: strategy execution unit, and described purpose mark, as the first packet, is formed the second packet after described first packet encapsulation by the packet being used for receiving;Send described second packet.

Having the beneficial effect that of the technique scheme of the present invention: in packet repeating process, controller can obtain each attribute of packet, as Broadcast ID, Route ID, ethernet packet header, IP packet header, TCP/UDP port numbers etc. identify as purpose, formulate forwarding strategy according to purpose mark, more finely and flexibly forward packet;Support many tenants, multipath forwards, flow load balance, more effectively make use of Internet resources.

Accompanying drawing explanation

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

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

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

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

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

Fig. 6 represents that the present invention's realizes optimal path flow chart;

Fig. 7 represents the subnet interior broadcast flow chart of the present invention;

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

Detailed description of the invention

For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, it is 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 to control-forward-separation.The chain of command of SDN is made up of the controller (Forwarding Policy Server) concentrated, and the behavior in face is forwarded by Open flow protocol integrated test system, control mode is to issue stream table, stream table includes matched rule and behavior, indicates the behavior that the packet matched with matched rule should be taked.After the forwarding face of SDN receives packet, coupling stream list item in order, perform corresponding instruction after finding occurrence;If not mating, packet can be transmitted to controller, controller processing.

Tenant can have multiple subnet, every main frame (Host) of tenant broadly falls into certain subnet, subnet is as a L 2 broadcast territory, and each L 2 broadcast territory is assigned a virtual process identifications Broadcast ID (being also called: broadcast domain identifies).Every main frame is connected on a port of a virtual access switch (Virtual Access Switch), each port has a unique port-mark, and each Virtual Access Switch is distributed a Route Distinguisher Route ID by controller.

Embodiments provide a kind of method realizing virtual network, as in figure 2 it is shown, include:

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

Step 2, identifies according to the purpose of described transmission type, the port-mark in source place, destination and formulates forwarding strategy;

Step 3, is sent to each virtual access switch and intermediary switch that described packet will pass through by described forwarding strategy;

The packet to receiving by described virtual access switch and intermediary switch, performs described forwarding strategy.

The technology that the application embodiment of the present invention provides, in packet repeating process, controller can obtain each attribute of packet, as Broadcast ID, Route ID, ethernet packet header, IP packet header, TCP/UDP port numbers etc. identify as purpose, formulate forwarding strategy according to purpose mark, forwarding face more finely and flexibly forward packet;Support many tenants, multipath forwards, flow load balance, more effectively make use of Internet resources.

The structure of virtual network is as in figure 2 it is shown, virtual network includes forwarding face and chain of command:

Forwarding face, including virtual access switch 202 and intermediary switch 206;Intermediary switch 206 is not directly connected to main frame 203, is responsible for middle forwarding packet.Main frame 203 is by virtual access switch 202 access of virtual network, and main frame 203 includes physical machine and virtual machine.

Chain of command, including controller 201, it interconnects with virtual access switch 202 and intermediary switch 206, issues forwarding strategy to virtual access switch 202 and intermediary switch 206, to control the forwarding behavior in forwarding face;Forwarding strategy includes controlling packet forwards, revises the attribute etc. of packet from which concrete port.

In virtual network, the operation principle of each device includes:

Controller 201, it is the equipment in composition control face, the control logic of whole virtual network is all formulated on controller 201, network event from the face of forwarding is responded by controller 201, forwarding strategy is issued to each virtual access switch 202 and intermediary switch 206, to realize the control to whole virtual network according to virtual network demand.

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

Intermediary switch 206, is the equipment in composition forwarding face, is the intermediate node of virtual network, is not directly accessed main frame 203.Packet is forwarded by the forwarding strategy that virtual access switch 202 and intermediary switch 206 are downloaded according to controller 201.

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

Controller 201 and the interface 204 in the face of forwarding, can use open flows (Openflow) agreement, network management protocol or proprietary protocol.

Virtual machine manager (VM Manager) 205, is responsible for main frame 203, by the information of main frame 203-include Broadcast ID, the port-mark of place port, and Route ID etc., send controller 201 to.

The mark of main frame 203, port-mark, and the virtual process identifications of the subnet belonging to main frame 203, and the corresponding relation between them is stored in controller 201.

In each attribute of packet, purpose mark at least includes virtual process identifications Broadcast ID, it is also possible to include purpose Route Distinguisher Route ID.

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

Destination refers to receive the destination host of packet, the subnet at destination host place.

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

When packet enters virtual network, stamp virtual process identifications, Route Distinguisher;Packet is in virtual network transmitting procedure, and forwarding face forwards according to the Route Distinguisher of packet;Different virtual networks is distinguished according to the virtual process identifications of packet in forwarding face, can only deliver a packet to the main frame of same virtual network.

The packaged type of packet is as shown in Figure 3, the packet 301 that source host 304 sends, including two layers of packet header (L2Header) and data (Data), it is encapsulated as packet 302 at virtual access switch 202, during this, use in esse web tab, as MPLS 20bit label realizes Broadcast ID and Route ID, it is packaged together with packet 301 and forms packet 302, or the formation packet 303 that only Broadcast ID and packet 301 is packaged together;Broadcast ID and Route ID, represents virtual process identifications and purpose virtual access switch 202b respectively;Now MPLS label is only used as Broadcast ID and the carrier of Route ID, does not have MPLS tag meaning originally.The Broadcast ID of 20bit can support more than 1,000,000 separate subnets, therefore, it is possible to support a large amount of tenant.

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, be sent to destination host 305.

Broadcast data packet 303 is not owing to being specifically to be transmitted to specific Host, and all Host in being intended for broadcast domain, so need not encapsulate Route ID, only encapsulation Broadcast ID.

Interface 204 agreement between controller 201 and forwarding face can have multiple choices, and as used Openflow agreement, forwarding strategy is realized by stream table;Can also use network management interface download policy, forwarding strategy is realized by network management configuration entry.

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

Or,

Described controller uses network management interface download protocol to issue described forwarding strategy;Described forwarding strategy is realized by network management configuration entry;

Or,

Described controller uses proprietary protocol to issue described forwarding strategy.

In a preferred embodiment, perform described forwarding strategy to include:

Using the packet that receives as the first packet, described purpose mark is formed the second packet after described first packet encapsulation;

Send described second packet.

The technical scheme provided can forward packet in same subnet.

In a preferred embodiment, packet is forwarded in described transmission type is same subnet;

Described purpose mark includes: according to the purpose virtual process identifications Broadcast ID of the main frame place subnet sending packet that described port-mark is found out, 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 purposes and identified: Broadcast ID and Route ID by the forwarding strategy issued.

Step 01, when main frame sends packet, controller 201, according to main frame place interface querying data base, is found out the Broadcast ID that main frame place subnet is corresponding, and the purpose Route Distinguisher Route ID of purpose virtual access switch, is formed forwarding strategy with this;

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

Step 03, turns Broadcast ID and Route ID envelope when performing forwarding strategy and forms the second packet in the first packet.

Forwarding in same subnet and need to stamp virtual process identifications Broadcast ID, which virtual network the most just cannot be distinguished by this packet is.When transmitting in subnet with second packet of Broadcast ID and Route ID, intermediary switch mates this purpose mark, ensure that this packet only can be dealt into the destination host in same subnet, realize transmitting the isolation between packet and subnet in same subnet with this.

The technical scheme provided can forward packet between different subnets.The virtual process identifications of the virtual network at encapsulation destination host place in the packet, can receive this packet with the main frame in guarantee only purpose virtual network.

In a preferred embodiment, transmission type is forwarding packet between subnet;

Purpose mark includes: the purpose virtual process identifications of purpose subnet, and the purpose Route Distinguisher Route ID of purpose virtual access switch.Purpose virtual access switch is positioned at purpose subnet.

Clean culture flow process in routing procedure is similar to subnet between subnet, except for the difference that, between subnet, route wants the Mac address of replacement data bag, this is because: when packet sends, Mac address, source is 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 main frame configuration, the router of main frame configuration is virtual, each main frame can configure IP address of router, during packet when between main frame subnet to be sent, main frame can obtain, by ARP protocol, the Mac address that this accessor is corresponding, and controller 201 now replaces virtual this ARP request of router response, returns to the router Mac address of virtual router to main frame.

Packet replaces with router Mac address through virtual access switch, Mac address, source, and purpose Mac address replaces with destination host Mac address.Need during this to arrange a virtual router address, but be not required to arrange physical router, only complete routing function by the replacement of Mac address.

In an application scenarios, as shown in Figure 4, illustrating as a example by the interface protocol between controller 201 and forwarding face using openflow agreement, forwarding strategy correspondence openflow agreement defined stream table, step includes:

Step 401, source host sends the first packet to the source virtual access switch 202a being connected with it.

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

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

Step 404, controller 201 issues stream table to purpose virtual access switch 202b, the responsible Broadcast ID and Route ID that ejects from the second packet received of these stream tables is to realize restoring data bag, and forwards the packet after reduction to suitable destination host.

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

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

Step 407, the stream table mentioned in source virtual access switch 202a coupling step 403, forward the second packet by optimal path.

Step 408, intermediary switch 206 coupling stream table, forward the second packet by optimal path.

Step 409, the stream table mentioned in 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, forward the first packet to destination host.

The technical scheme provided also is able to forward the packet of clean culture.

In a preferred embodiment, transmission type is clean culture;

Step 2 also includes: calculate at least one path optimizing between the main frame and the destination that send packet;Described forwarding strategy includes described at least one path optimizing;

Perform described forwarding strategy to include: by the purpose virtual access switch of described purpose subnet, described second packet is reduced to the first packet, described first packet is issued destination host.

When main frame sends unicast packet, the Route ID of destination host place virtual access switch inquired about by controller 201, issues corresponding forwarding strategy, and virtual access switch performs to be encapsulated in the packet by this Route ID during forwarding strategy.

Controller 201 calculates optimal path between each two virtual access switch, and issue forwarding strategy, Route ID in forwarding strategy matched data bag, it is made to forward along particular path, until arriving purpose virtual access switch 202b, purpose virtual access switch 202b it is transmitted to destination host.

Controller 201 can also calculate mulitpath simultaneously, allows current packet select a paths to forward by predefined forwarding strategy, thus realizes load balance.Determined to use different pass-through modes by controller 201, different selections can be determined the most at any time.

In subnet, unicast packet needs to stamp Broadcast ID and Route ID, the two mark is all realized by MPLS label, Route ID is used for recognition purpose virtual access switch 202b, Broadcast ID is for one L 2 broadcast territory (subnet) of unique mark, ensure that the main frame in same subnet just can receive this packet, realize the isolation between subnet well.

In an application scenarios, as it is shown in figure 5, illustrate using openflow agreement as the interface protocol between controller 201 and forwarding face, the stream table of forwarding strategy correspondence openflow protocol definition, step includes:

Step 501, source host sends the first packet to the source virtual access switch 202a being connected with it.

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

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

Step 504, controller 201 issues 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 forward the first packet to suitable main frame;

Stream table can be downloaded when receiving PacketIn message, it is also possible to selects to download before main frame sends packet.

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

Step 506, virtual access switch 202a in source, by this data packet matched stream table, performs the behavior that stream table specifies, forms the second packet to the first packet encapsulation Broadcast ID and Route ID;

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

Step 508, intermediary switch 206 coupling stream table, forward the second packet by optimal path;

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

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

Each packet uses optimal path to forward, can also forward according to the specific policy that tenant is corresponding, specifically, different routed path can be selected according to the rank belonging to tenant, during this, need to arrange on each node in routed path corresponding stream table.

In each embodiment, the mode issuing the forwarding strategy realizing optimal path has multiple, can be at once to issue forwarding strategy when network topology structure changes, can also first calculate optimal path, forwarding strategy is issued again when there being packet to send, as shown in Figure 6, it is achieved the flow process of optimal path includes:

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

When employing openflow is as the agreement between chain of command and forwarding face, controller 201 detection network topological structure includes: controller 201 may indicate that each port sends Link Layer Discovery Protocol (LLDP, Link Layer Discovery Protocol) bag, if another port in the face of forwarding receives this LLDP bag, then it is assumed that have a link between two ports.

Step 602, calculates each virtual access switch 202 and arrives 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, indicating the described port that should export to the packet of purpose virtual access switch 202b from a virtual access switch 202 in forwarding strategy, matching field is Route ID.

The technical scheme provided also is able to forward broadcast data packet.

In a preferred embodiment, transmission type is broadcast;

Include before step one:

The first kind broadcast tree covering whole described subnet is set up in each subnet;

Or, each subnet to be set up Equations of The Second Kind broadcast and sets, in each described Equations of The Second Kind broadcast tree, in selected described subnet has the root node that the virtual access switch being connected is set as the broadcast of this Equations of The Second Kind with main frame.

The mode setting up broadcast tree has multiple, can set up broadcast tree when sending broadcast packet, it is also possible to pre-build broadcast tree;Broadcast tree can set up one with each subnet, it is also possible to the Virtual Access Switch being connected with each main frame in each subnet sets up multiple for root.Owing to the node of broadcast tree is relevant to the position of main frame, therefore during position of host machine change, broadcast tree to be re-established, and update stream table.

In a preferred embodiment, purpose mark includes: the purpose mark of corresponding purpose subnet is set in the first kind broadcast tree of destination or Equations of The Second Kind broadcast;

Perform described forwarding strategy to include: by the purpose virtual access switch of described purpose subnet, described second packet is reduced to the first packet, described first packet is issued destination host.

In an application scenarios, as it is shown in fig. 7, broadcast packet needs the Broadcast ID realized in encapsulation by MPLS label in subnet.By openflow agreement for illustrating as a example by the interface protocol between controller 201 and forwarding face, the stream table of forwarding strategy correspondence openflow protocol definition.Controller 201 sets up a broadcast tree by issuing stream table, makes packet propagate by broadcast tree, and step includes:

Step 701, source host sends the first packet to the source virtual access switch 202a being connected with source host.

Step 702, the stream table that virtual access switch 202a in source does not mate, the first packet is transmitted to controller 201 by PacketIn message.

Step 703, controller 201 issues 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 broadcast according to network topology and is set, and issues stream table according to setting up the result broadcasting tree to the intermediary switch 206 that broadcast tree node is corresponding, and the forwarding in broadcasting tree of the second packet is responsible for by these stream tables.

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

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

Step 707, source virtual access switch 202a coupling stream table, load onto Broadcast ID to the first data envelope and form the second packet.

Step 708, source virtual access switch 202a coupling stream table, forward the second packet by broadcast tree.

Step 709, intermediary switch 206 flow table, forward packet by broadcast tree;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, restores the first packet.

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

A kind of controller of embodiment of the present invention offer, as shown in Figure 8, including:

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

Policy development unit 802, identifies for the purpose according to described transmission type, the port-mark in source place, destination and formulates forwarding strategy;

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

By described virtual access switch and intermediary switch, the packet to receiving performs described forwarding strategy.

In a preferred embodiment, policy development unit 802 includes:

First formulates module, for when forwarding packet in described transmission type is same subnet;

Arrange described purpose mark to include: according to the purpose virtual process identifications of the main frame place subnet sending packet that described port-mark determines, and the purpose Route Distinguisher of purpose virtual access switch.

In a preferred embodiment, policy development unit 802 includes:

Second formulates module, is used for when described transmission type is to forward packet between subnet,

Arrange described purpose mark to include: the purpose virtual process identifications of purpose subnet, and the purpose Route Distinguisher of purpose virtual access switch.

In a preferred embodiment, policy development unit 802 includes:

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

Calculate at least one path optimizing between the main frame and the destination that send packet;Described forwarding strategy includes described at least one path optimizing.

In a preferred embodiment, also include:

Broadcast tree unit, for setting up the first kind broadcast tree covering whole described subnet in each subnet;

Or, each subnet to be set up Equations of The Second Kind broadcast and sets, in each described Equations of The Second Kind broadcast tree, in selected described subnet has the root node that the virtual access switch being connected is set as the broadcast of this Equations of The Second Kind with main frame.

In a preferred embodiment, policy development unit 802 includes:

4th formulates module, is used for when described transmission type is for broadcast,

Arrange described purpose mark to include: the purpose mark of corresponding purpose subnet is set in the first kind broadcast tree of destination or Equations of The Second Kind broadcast.

The embodiment of the present invention provides a kind of virtual network, as in figure 2 it is shown, include: 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 virtual access switch, and is connected with described controller;

Each main frame is respectively positioned in a subnet, and the All hosts in subnet is in a L 2 broadcast territory, and L 2 broadcast territory has virtual process identifications;

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

Also include controller, as shown in Figure 8, in controller:

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

Policy development unit 802, identifies for the purpose according to described transmission type, the port-mark in source place, destination and formulates forwarding strategy;

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

By described virtual access switch and intermediary switch, the packet to receiving performs described forwarding strategy.

In a preferred embodiment, virtual access switch includes:

First strategy execution unit, described purpose mark, as the first packet, is formed the second packet after described first packet encapsulation by the packet being used for receiving;Send described second packet;

And,

Second intermediary switch includes:

Strategy execution unit, described purpose mark, as the first packet, is formed the second packet after described first packet encapsulation by the packet being used for receiving;Send described second packet.

Advantage after using this programme is: by stamping virtual network label and routing tag for packet, many tenants support, multipath, flow load balance ability are provided, and data network more fully can be managed, implementing more flexible data forwarding strategy, the demand even for specific tenant implements the optimization of flow and control.

The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (14)

1. the method realizing virtual network, it is characterised in that including:
Step one, the controller of virtual network obtains the transmission type of the packet sent by main frame, source place And destination;
Step 2, identifies according to the purpose of described transmission type, the port-mark in source place, destination and formulates Forwarding strategy;
Step 3, is sent to each virtual access exchange that described packet will pass through by described forwarding strategy Machine and intermediary switch;
The packet to receiving by described virtual access switch and intermediary switch, performs described forwarding plan Omit, including: the packet of cross-network segment replaces with router through virtual access switch, Mac address, source Mac address, purpose Mac address replaces with destination host Mac address, needs to arrange one during this Individual virtual router address, but be not required to arrange physical router, only completed by the replacement of Mac address Routing function.
Method the most according to claim 1, it is characterised in that perform described forwarding strategy and include:
Using the packet that receives as the first packet, by described purpose mark and described first data envelope The second packet is formed after dress;
Send described second packet.
Method the most according to claim 2, it is characterised in that described transmission type is between subnet Forward packet;
Described purpose mark includes: the purpose virtual process identifications of purpose subnet, and purpose virtual access is handed over The purpose Route Distinguisher changed planes.
Method the most according to claim 2, it is characterised in that described transmission type is clean culture;
Step 2 also includes: calculate at least one optimization road between main frame and the destination sending packet Footpath;Described forwarding strategy includes described at least one path optimizing;
Perform described forwarding strategy to include: by the purpose virtual access switch of purpose subnet by described second number It is reduced to the first packet according to bag, described first packet after reduction is issued destination host.
Method the most according to claim 2, it is characterised in that described transmission type is broadcast;
Include before step one:
The first kind broadcast tree covering whole described subnet is set up in each subnet;
Or, each subnet is set up Equations of The Second Kind broadcast tree, in each described Equations of The Second Kind broadcast tree, In selected described subnet one has the virtual access switch being connected as this Equations of The Second Kind broadcast tree with main frame Root node.
Method the most according to claim 5, it is characterised in that
Described purpose mark includes: corresponding purpose is set in the first kind broadcast tree of destination or Equations of The Second Kind broadcast The purpose mark of subnet;
Perform described forwarding strategy to include: by the purpose virtual access switch of described purpose subnet by described Two packets are reduced to the first packet, and described first packet is issued destination host.
Method the most according to claim 1, it is characterised in that
Described controller uses Openflow agreement to issue described forwarding strategy;Described forwarding strategy is by flowing table Realize;
Or,
Described controller uses network management interface download protocol to issue described forwarding strategy;Described forwarding strategy is by net Pipe configuration entry realizes;
Or,
Described controller uses selected proprietary protocol to issue described forwarding strategy.
8. a controller, it is characterised in that including:
Information acquisition unit, for obtaining the transmission type of the packet sent by main frame, source place and purpose Ground;
Policy development unit, for according to described transmission type, the port-mark in source place, the mesh of destination Mark formulate forwarding strategy;
Policy distribution unit, for being sent to each void that described packet will pass through by described forwarding strategy Intend access switch and intermediary switch;
By described virtual access switch and intermediary switch, the packet to receiving performs described forwarding plan Omit, including: the packet of cross-network segment replaces with router through virtual access switch, Mac address, source Mac address, purpose Mac address replaces with destination host Mac address, needs to arrange one during this Individual virtual router address, but be not required to arrange physical router, only completed by the replacement of Mac address Routing function.
Controller the most according to claim 8, it is characterised in that policy development unit includes:
Second formulates module, for when described transmission type is to forward packet between subnet, arranging described Purpose mark includes: the purpose virtual process identifications of purpose subnet, and the mesh of purpose virtual access switch Route Distinguisher.
Controller the most according to claim 8, it is characterised in that policy development unit includes:
3rd formulates module, for when described transmission type is clean culture, calculates the main frame sending packet And at least one path optimizing between destination;Described forwarding strategy includes that described at least one optimizes road Footpath.
11. controllers according to claim 8, it is characterised in that also include:
Broadcast tree unit, for setting up the first kind broadcast covering whole described subnet in each subnet Tree;
Or, each subnet is set up Equations of The Second Kind broadcast tree, in each described Equations of The Second Kind broadcast tree, In selected described subnet one has the virtual access switch being connected as this Equations of The Second Kind broadcast tree with main frame Root node.
12. controllers according to claim 10, it is characterised in that policy development unit includes:
4th formulates module, for when described transmission type is for broadcast, arranges described purpose mark and includes: The first kind broadcast tree of destination or the purpose mark of the purpose subnet of Equations of The Second Kind broadcast tree correspondence.
13. 1 kinds of virtual networks, it is characterised in that including: 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 virtual access switch, and is connected with described controller;
Each main frame is respectively positioned in a subnet, the All hosts in subnet in a L 2 broadcast territory, L 2 broadcast territory has virtual process identifications;
One main frame is connected by port with virtual access switch, and port has port-mark;
Controller in also including such as claim 8~any one of claim 12.
14. virtual networks according to claim 13, it is characterised in that
Virtual access switch includes:
First strategy execution unit, the packet being used for receiving is as the first packet, by described purpose The second packet is formed after mark and described first packet encapsulation;Send described second packet;
And,
Second intermediary switch includes:
Strategy execution unit, described purpose, as the first packet, is identified by the packet being used for receiving The second packet is formed with after described first packet encapsulation;Send described second packet.
CN201210346457.9A 2012-09-18 2012-09-18 A kind of realize the method for virtual network, controller and virtual network CN102857416B (en)

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