CN104301129A - Dynamic host configuration method and system in software defined network - Google Patents
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Abstract
The invention provides a dynamic host configuration method and system in a software defined network. The method comprises the following steps that: a controller computes virtual network configuration in an entire physical network, and transmits the virtual network configuration to an OpenFlow switch by using an OpenFlow protocol to form a plurality of virtual networks in the entire physical network; the OpenFlow switch receives a flow table control command issued by the controller, and performs matching rule configuration on an own flow table according to the flow table control command; the OpenFlow switch receives data packets from other OpenFlow switches or hosts, processes the data packets according to a matching rule recorded by the own flow table and the attributes of the data packets, and outputs a DHCP (Dynamic Host Configuration Protocol) data packet needing to be forwarded; and the OpenFlow switch forwards the DHCP data packet to the controller, a destination OpenFlow switch or a destination host. Through adoption of the dynamic host configuration method and system, centralized dynamic configuration of an access host in a multiple virtual overlay network is realized; the network efficiency is increased; and the problem of increase of the network complexity due to the multiple virtual overlay network in the software defined network is solved.
Description
Technical field
The invention belongs to technical field of the computer network, relate to the dynamic master configurating method in a kind of software defined network and system.
Background technology
DynamicHost arranges agreement (Dynamic Host Configuration Protocol, DHCP) be that a kind of network manager of enabling manages the communication protocol with the automatic distributing IP network address concentratedly, use UDP(User Datagram Protocol, User Datagram Protoco (UDP)) protocols work, mainly contain two purposes: make internal network or Internet service provider's automatic IP address allocation to user; To internal network keeper as the means all computers being made to central management.In an ip network, the equipment of each connection Internet needs to distribute unique IP address.DHCP makes network manager can monitor and distributing IP address from central node.When moving on to other position in network when certain computer, automatically can receive new IP address.Along with increasing of enterprise host quantity, increasing enterprise starts to adopt the form of DHCP to come dynamic distributing IP address.Adopt Dynamic Host Configuration Protocol server to come the IP address of management enterprise network, advantage is clearly, as effectively avoided the collision problem of IP address, can save the trouble of manual configuration network of relation parameter.
Software defined network (Software Defined Network, SDN) be a kind of new network framework, its core technology OpenFlow is by separating network equipment chain of command and data surface, thus achieve the flexible control of network traffics, for the innovation of core network and application provides good platform.Under the open architecture of SDN, network (SDN territory) in certain limit implements management by centralized and unified control logic unit, solve the problem of large number quipments dispersion independent operating management in network thus, the design of network, deployment, O&M, management are completed at a control point, and bottom-layer network otherness is also because uncoupled framework obtain elimination.Centralized control introduces the role that SDN is different from traditional network architecture in a network---and SDN controller, namely runs SDN operating system and controls the control unit of all-network node.SDN can provide the interface of network application, Software for Design and programming is carried out on this basis according to business demand, and be load on SDN controller, thus the whole network is upgraded rapidly new network function, and independent operation need not be carried out to each network element node again.
In software defined network, generally carry out virtual by controller to network, allow network to share the physical resources such as identical physical link and router, be the virtual resource that various virtual net request dispatching is suitable, achieve resource-sharing.This network virtualization mode, achieves multiple virtual nerve of a covering in software defined network, improves infrastructure resources utilance, but also correspondingly improves network complexity.In the multiple virtual overlay network of software defined network, the virtual nerve of a covering of frequent variations makes to become more difficult to the centralized configuration of network.How to realize the concentrated dynamic-configuration of access host in the multiple virtual overlay network to software defined network, become the technical task that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide the dynamic master configurating method in a kind of software defined network and system, the problem of dynamic-configuration cannot be concentrated for solving the main frame accessed in multiple virtual overlay network in prior art.
For achieving the above object and other relevant objects, the invention provides the dynamic master configurating method in a kind of software defined network and system.
Dynamic master configurating method in a kind of software defined network, dynamic master configurating method in described software defined network comprises: controller calculates the virtual network configuration in whole physical network, OpenFlow agreement is utilized to send virtual network configuration to OpenFlow switch, thus multiple virtual network is formed in whole physical network, mutually isolated between each virtual network.
Preferably, described virtual network configuration comprises: controller is virtual network node and the Resources allocation of the generation of each OpenFlow switch; Controller is the stream table control command that each OpenFlow switch generates; Controller is the IP address of the host configuration in whole physical network and virtual network.
Preferably, dynamic master configurating method in described software defined network also comprises: described controller carries out DHCP relay setting on crucial OpenFlow switch, makes the dhcp message being arranged in different virtual network with described controller by described crucial OpenFlow switch normal delivery extremely described controller; Described DHCP relay arranges the rule being included in 67 and 68 ports of configurations match udp protocol in the stream table of described crucial OpenFlow switch.
Dynamic master configurating method in a kind of software defined network, dynamic master configurating method in described software defined network comprises: OpenFlow switch receives the stream table control command that controller issues, and carries out matched rule configuration according to the stream table of described stream table control command to self; OpenFlow switch receives the packet from other OpenFlow switches or main frame, and processes described packet according to self the matched rule of stream table record and the attribute of packet, exports the DHCP packet needing to forward; Described DHCP packet is transmitted to controller, object OpenFlow switch or destination host by OpenFlow switch.
Preferably, described OpenFlow switch comprises the process that packet processes: the coupling of the complete paired data bag of stream entry finding stream table medium priority the highest; According to data packet matched to the additions and deletions of stream entry change instruction set, comprise the matching domain of Update Table bag, more new data packets, update action set, upgrade and pass to the metadata of next stream table; The packet of coupling and behavior aggregate are sent to next stream table, or the set that performs an action.
Preferably, the attribute of described packet is the matching domain that OpenFlow agreement is specified, and comprises physical ingress port, mac source address, MAC destination address, VLAN ID, VLAN priority, MPLS mark, IP source address, IP destination address, TCP/UDP source port, TCP/UDP destination interface.
Preferably, described DHCP packet is transmitted to controller, object OpenFlow switch or destination host by physical port or virtual port by described OpenFlow switch.
DynamicHost configuration-system in a kind of software defined network, DynamicHost configuration-system in described software defined network comprises: controller, calculate the virtual network configuration in whole physical network, OpenFlow agreement is utilized to send virtual network configuration to OpenFlow switch, thus multiple virtual network is formed in whole physical network, mutually isolated between each virtual network; OpenFlow switch, communicates with described controller and is connected, and receives the stream table control command that controller issues, and carries out matched rule configuration according to the stream table of described stream table control command to self; Receive the packet from other OpenFlow switches or main frame, and according to self the matched rule of stream table record and the attribute of packet, process is carried out to described packet and obtain DHCP packet, and described DHCP packet is transmitted to controller, object OpenFlow switch or destination host.
Preferably, the attribute of described packet is the matching domain that OpenFlow agreement is specified, and comprises physical ingress port, mac source address, MAC destination address, VLAN ID, VLAN priority, MPLS mark, IP source address, IP destination address, TCP/UDP source port, TCP/UDP destination interface.
Preferably, described controller comprises: virtual network configuration module, is network node and the Resources allocation of each OpenFlow switch generating virtual, for each OpenFlow switch generates stream table control command; Host configuration module is the host configuration IP address in whole physical network and virtual network.
As mentioned above, the dynamic master configurating method in software defined network of the present invention and system, have following beneficial effect:
Present invention achieves the concentrated dynamic-configuration of access host in multiple virtual overlay network, improve network efficiency, solve multiple virtual nerve of a covering in software defined network and be directed at network complexity and improve the problem brought.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the dynamic master configurating method in software defined network of the present invention.
Fig. 2 is a kind of embodiment schematic diagram of the dynamic master configurating method in software defined network of the present invention.
Fig. 3 is the structural representation of the DynamicHost configuration-system in software defined network of the present invention.
Element numbers explanation
210 controllers
211 virtual network configuration modules
212 host configuration module
220 OpenFlow switches
221 stream tables
222 inner passages
223 forward face
S201 ~ S209 step
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to accompanying drawing.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
Embodiment
The present embodiment provides the dynamic master configurating method in a kind of software defined network, and as shown in Figure 1, the dynamic master configurating method in described software defined network comprises:
Controller utilizes OpenFlow agreement to send virtual network configuration to OpenFlow switch, thus forms multiple virtual network in whole physical network, mutually isolated between each virtual network.Wherein, described virtual network configuration comprises: controller is virtual network node and the Resources allocation of the generation of each OpenFlow switch; Controller is the stream table control command that each OpenFlow switch generates; Controller is the IP address of the host configuration in whole physical network and virtual network.The division rule of virtual network is: the combination in any that can use switch ports themselves, source/destination ethernet address or type, source/destination IP address or type, source/destination TCP/UDP port or ICMP code/type.
Due to the existence of multiple virtual network, controller and main frame may not in same virtual networks.When both are in different virtual network, due to the effect of isolation mech isolation test, the dhcp broadcast message that DHCP client computer (i.e. main frame) sends cannot send to controller.For this reason, the present invention, by carrying out DHCP relay on crucial OpenFlow switch, makes dhcp message realize normal delivery.According to DHCP consensus standard, Dynamic Host Configuration Protocol server end uses 67 ports of udp protocol, and dhcp client uses 68 ports of udp protocol.Therefore, controller also needs the rule of 67 and 68 ports of configurations match udp protocol in crucial OpenFlow switch stream table, DHCP packet can be forwarded to controller or main frame according to rule to make switch.
Further, described controller carries out DHCP relay setting on crucial OpenFlow switch, makes the dhcp message being arranged in different virtual network with described controller by described crucial OpenFlow switch normal delivery extremely described controller; Described DHCP relay arranges the rule being included in 67 and 68 ports of configurations match udp protocol in the stream table of described crucial OpenFlow switch.The present invention utilizes OpenFlow agreement to make controller that the rule of virtual network and host configuration is handed down to OpenFlow switch; OpenFlow switch carries out rule match to the packet received, and when packet can mate the DHCP relay rule of host configuration, described switch performs forwarding to packet, thus mutual at the internetwork controller of different virtual and main frame of realization; When packet can only matching virtual networking rule time, then packet only can forward in current virtual network.
OpenFlow switch receives the stream table control command that controller issues, and carries out matched rule configuration according to the stream table of described stream table control command to self.
OpenFlow switch receives the packet from other OpenFlow switches or main frame, and processes described packet according to self the matched rule of stream table record and the attribute of packet, exports the DHCP packet needing to forward; Wherein, the attribute of described packet is the matching domain that OpenFlow agreement is specified, and comprises physical ingress port, mac source address, MAC destination address, VLAN ID, VLAN priority, MPLS mark, IP source address, IP destination address, TCP/UDP source port, TCP/UDP destination interface.Further, described OpenFlow switch comprises the process that packet processes: the coupling of the complete paired data bag of stream entry finding stream table medium priority the highest; According to data packet matched to the additions and deletions of stream entry change instruction set, comprise the matching domain of Update Table bag, more new data packets, update action set, upgrade and pass to the metadata of next stream table; The packet of coupling and behavior aggregate are sent to next stream table, or the set that performs an action.Particularly, described OpenFlow switch stream table processes packet according to packet attribute, main processing steps: (1) mates: find the highest stream entry of stream table medium priority to complete coupling, this physical port will entered according to ingress port(packet), packet header (packet header), and metadata (metadata) the three class matching domain having a upper stream table to specify carries out.(2) instruction (i.e. every bar stream entry perform an action): the stream entry additions and deletions according to matching change instruction set, comprises amendment bag, the matching domain upgrading bag, update action set (action set), upgrades the metadata (metadata) passing to next stream table; (3) send: the data of coupling and behavior aggregate are sent to next stream table, or the set that performs an action (action set), as sent packet by forwarding towards particular port.
Described DHCP packet is transmitted to controller, object OpenFlow switch or destination host by OpenFlow switch.Further, described DHCP packet is transmitted to controller, object OpenFlow switch or destination host by physical port or virtual port by described OpenFlow switch.
The present invention only needs to define host configuration rule in the controller, can complete the configuration to main frame in all physics and virtual network, without the need to extra DHCP equipment, improves network equipment service efficiency, solves network complexity and improves the problem brought.
The present embodiment provides the specific implementation process of the dynamic master configurating method in a kind of software defined network, as shown in Figure 2, comprising:
S301, the virtual network module of controller calculates the virtual network configuration in whole physical network, OpenFlow agreement is utilized to send virtual network configuration to OpenFlow switch, be each OpenFlow switch and generate the virtual network node of needs and Resources allocation, thus multiple virtual network is formed in whole physical network, mutually isolated between virtual network, avoid influencing each other.Controller utilizes OpenFlow agreement to send virtual network configuration to OpenFlow switch.
S302, host broadcast sends DHCP Discover message.Main frame sends broadcast and finds available server on physical subnets.Main frame generates the UDP bag that a destination address is a 255.255.255.255 or subnet broadcast address.
S303, OpenFlow switch forwards DHCP Discover message to controller.OpenFlow switch carries out rule match after receiving DHCP Discover message in stream table, according to the rule of pre-installation in step S101, this message can be transmitted to controller.
S304, DHCP Offers message replied by controller.When controller receives an IP lease request from client, it can provide an IP lease.Controller retains an IP address for client, then passes through Web broadcast DHCP Offers message to main frame.The IP address that this DHCP Offers message comprises the MAC Address of client, server provides, subnet mask, rental period and the IP address of controller of IP is provided.
S305, OpenFlow switch forwards DHCP Offers message.OpenFlow switch carries out rule match after receiving DHCP Offers message in stream table, according to the rule of pre-installation in step 101, this DHCP Offers message can be transmitted to main frame.
S306, when main frame receive an IP lease provide time, it must tell controller it received a lease and provide.Therefore, this main frame can send a DHCP Requests message, comprises the IP address of the controller providing lease in this DHCP Requests message.After other controllers have received this message, their host configuration module can regain be likely supplied to the IP lease of main frame (client).Then they place back in that address once retaining to main frame (client) in available address pond, and like this, they just can distribute this address for other computers.The controller of any amount can respond the request of same IP lease, but each client's network interface card can only accept a lease to be provided.
S307, OpenFlow switch forwards DHCP Requests message.OpenFlow switch carries out rule match after receiving DHCP Requests message in stream table, according to the rule of pre-installation in step 101, this message can be transmitted to all controllers.
S308, after controller receives the DHCP Requests message of from host (client), it just starts the last response phase of layoutprocedure, and this response phase comprises transmission DHCP ACK and wraps to main frame (client).Other all configuration informations that this DHCP ACK handbag may be asked containing rental period and client.At this time, the Host Configuration Procedure of controller just completes.
S309, OpenFlow switch forwards DHCP ACK message.After OpenFlow switch receives DHCP ACK message, in stream table, carry out rule match, according to the rule of pre-installation in step 101, this DHCP ACK message can be transmitted to (client) main frame.Like this, whole Dynamic Configuration Process is completed.
The present embodiment also provides the configuration-system of the DynamicHost in a kind of software defined network, this system can realize the dynamic master configurating method in above-mentioned software defined network, but the implement device of dynamic master configurating method in described software defined network includes but not limited to the DynamicHost configuration-system in software defined network of the present invention.
As shown in Figure 3, the DynamicHost configuration-system in described software defined network comprises: controller 210 and OpenFlow switch 220.Controller 210 carries out control and management by OpenFlow agreement to OpenFlow switch; OpenFlow switch can receive the packet from outside, and the rule match packet recorded in use stream table also performs an action, and the packet without stream table matched rule is transmitted to controller.
Wherein, controller 210 calculates the virtual network configuration in whole physical network, utilizes OpenFlow agreement to send virtual network configuration to OpenFlow switch, thus form multiple virtual network in whole physical network, mutually isolated between each virtual network.Further, described controller 210 comprises: virtual network configuration module 211 and host configuration module 212.Described virtual network configuration module 211 divides multiple virtual network in whole physical network, for network node and the Resources allocation of each OpenFlow switch generating virtual, for each OpenFlow switch generates stream table control command, the stream table of OpenFlow agreement to OpenFlow switch is utilized to control.Host configuration module 212 is the host configuration IP address in whole physical network and virtual network.
OpenFlow switch 220 communicates with described controller and is connected, the stream table control command issued by OpenFlow agreement reception controller, and carries out matched rule configuration according to the stream table of described stream table control command to self; Described OpenFlow switch receives the packet from other OpenFlow switches or main frame, and according to self the matched rule of stream table record and the attribute of packet, matching treatment is carried out to described packet and obtain the DHCP packet needing to forward, and by inner passage by described DHCP Packet Generation to forwarding face, then be transmitted to controller, object OpenFlow switch or destination host by forwarding face according to port information.Wherein, the attribute of described packet is the matching domain that OpenFlow agreement is specified, and comprises physical ingress port, mac source address, MAC destination address, VLAN ID, VLAN priority, MPLS mark, IP source address, IP destination address, TCP/UDP source port, TCP/UDP destination interface etc.Wherein, main frame normally finds available server by the form of broadcast data packet; Described packet is UDP bag.
Further, described OpenFlow switch 220 comprises stream table 221, inner passage 222, forwarding face 223.Record data packet matched rule in stream table 221, OpenFlow switch 220 matches the DHCP packet needing to carry out relaying according to stream table, and DHCP packet is sent to forwarding face by inner passage, then is forwarded to specific port by forwarding face.The inner passage 222 of described OpenFlow switch transmits packet for showing from stream between forwarding face, can be sent to external port by forwarding face, and the packet realized to controller, other switches or main frame forwards.The forwarding face 223 of described OpenFlow switch is for externally sending packet by physics or virtual port, and the packet realized to controller, other switches or main frame forwards.
The dynamic-configuration to access host in software defined network can be realized thus, only need to define host configuration rule in the controller, the configuration to the main frame in whole physical network and virtual network can be completed, without the need to extra DHCP equipment.
In sum, invention increases the service efficiency of the network equipment, solve multiple virtual network in software defined network and cause network complexity to improve the problem brought.
The present invention utilizes OpenFlow agreement to make controller that the rule of virtual network and host configuration is handed down to OpenFlow switch; OpenFlow switch carries out rule match to the packet received, and when packet can mate the DHCP relay rule of host configuration, described switch performs forwarding to packet, thus mutual at the internetwork controller of different virtual and main frame of realization; When packet can only matching virtual networking rule time, then packet only can forward in current virtual network.
The present invention is in the software defined network of multiple virtual network, the main frame achieving access different virtual network carries out dynamic-configuration by unified controller, improve network equipment service efficiency, solve multiple virtual nerve of a covering in software defined network and cause network complexity to improve the problem brought.
In sum, the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. the dynamic master configurating method in software defined network, is characterized in that, the dynamic master configurating method in described software defined network comprises:
Controller utilizes OpenFlow agreement to send virtual network configuration to OpenFlow switch, thus forms multiple virtual network in whole physical network, mutually isolated between each virtual network.
2. the dynamic master configurating method in software defined network according to claim 1, is characterized in that: described virtual network configuration comprises:
Controller is virtual network node and the Resources allocation of the generation of each OpenFlow switch;
Controller is the stream table control command that each OpenFlow switch generates;
Controller is the IP address of the host configuration in whole physical network and virtual network.
3. the dynamic master configurating method in software defined network according to claim 1, it is characterized in that, dynamic master configurating method in described software defined network also comprises: described controller carries out DHCP relay setting on crucial OpenFlow switch, makes the dhcp message being arranged in different virtual network with described controller by described crucial OpenFlow switch normal delivery extremely described controller; Described DHCP relay arranges the rule being included in 67 and 68 ports of configurations match udp protocol in the stream table of described crucial OpenFlow switch.
4. the dynamic master configurating method in software defined network, is characterized in that, the dynamic master configurating method in described software defined network comprises:
OpenFlow switch receives the stream table control command that controller issues, and carries out matched rule configuration according to the stream table of described stream table control command to self;
OpenFlow switch receives the packet from other OpenFlow switches or main frame, and processes described packet according to self the matched rule of stream table record and the attribute of packet, exports the DHCP packet needing to forward;
Described DHCP packet is transmitted to controller, object OpenFlow switch or destination host by OpenFlow switch.
5. the dynamic master configurating method in software defined network according to claim 4, is characterized in that, described OpenFlow switch comprises the process that packet processes:
The coupling of the complete paired data bag of stream entry finding stream table medium priority the highest;
According to data packet matched to the additions and deletions of stream entry change instruction set, comprise the matching domain of Update Table bag, more new data packets, update action set, upgrade and pass to the metadata of next stream table;
The packet of coupling and set of actions are sent to next stream table, or the set that performs an action.
6. the dynamic master configurating method in software defined network according to claim 4, it is characterized in that: the attribute of described packet is the matching domain that OpenFlow agreement is specified, comprise physical ingress port, mac source address, MAC destination address, VLAN ID, VLAN priority, MPLS mark, IP source address, IP destination address, TCP/UDP source port, TCP/UDP destination interface.
7. the dynamic master configurating method in software defined network according to claim 4, is characterized in that: described DHCP packet is transmitted to controller, object OpenFlow switch or destination host by physical port or virtual port by described OpenFlow switch.
8. the DynamicHost configuration-system in software defined network, is characterized in that, the DynamicHost configuration-system in described software defined network comprises:
At least 1 controller, calculates the virtual network configuration in whole physical network, utilizes OpenFlow agreement to send virtual network configuration to OpenFlow switch, thus form multiple virtual network in whole physical network, mutually isolated between each virtual network;
At least 1 OpenFlow switch, communicates with described controller and is connected, and receives the stream table control command that controller issues, and carries out matched rule configuration according to the stream table of described stream table control command to self; Receive the packet from other OpenFlow switches or main frame, and according to self the matched rule of stream table record and the attribute of packet, process is carried out to described packet and obtain DHCP packet, and described DHCP packet is transmitted to controller, object OpenFlow switch or destination host.
9. the DynamicHost configuration-system in software defined network according to claim 8, it is characterized in that: the attribute of described packet is the matching domain that OpenFlow agreement is specified, comprise physical ingress port, mac source address, MAC destination address, VLAN ID, VLAN priority, MPLS mark, IP source address, IP destination address, TCP/UDP source port, TCP/UDP destination interface.
10. the DynamicHost configuration-system in software defined network according to claim 8, is characterized in that, described controller comprises:
Virtual network configuration module is network node and the Resources allocation of each OpenFlow switch generating virtual, for each OpenFlow switch generates stream table control command;
Host configuration module is the host configuration IP address in whole physical network and virtual network.
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