CN103248724A - SDN (Software-Defined Networking) controller-based DHCP (Dynamic Host Configuration Protocol) broadcast processing method - Google Patents
SDN (Software-Defined Networking) controller-based DHCP (Dynamic Host Configuration Protocol) broadcast processing method Download PDFInfo
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Abstract
The invention discloses an SDN (Software-Defined Networking) controller-based DHCP (Dynamic Host Configuration Protocol) broadcast processing method. The method aims to solve the problem of DHCP broadcast flooding on the basis of the SDN controller, mainly adopts a packet-out message manner to transmit DHCP broadcast packets between a source host computer and a DHCP server by caching the position of the DHCP server at the end of a controller, and meanwhile is used for recording the basic information of a host computer, which includes the IP address, MAC address and position information, when the host computer succeeds in acquiring configuration information such as the IP address. The method greatly reduces the load of the controller and network flow.
Description
Technical field
The present invention relates to network communications technology field, specifically is a kind of dhcp broadcast processing method based on the SDN controller.
Background technology
(Software-DefinedNetworking is the most popular future network technology recent years SDN) to software defined network, also is the popular candidate network form of enterprise network, campus network, data center network.Its core concept is datum plane and the separating of control plane, and adopts long-range controller to concentrate network is unified management and control.
DynamicHost arranges agreement, and (DynamicHostConfigurationProtocol is that a kind of network manager of making can manage concentratedly and the automatic communication protocol of the distributing IP network address DHCP).In IP network, each equipment that connects Internet needs to distribute unique IP address.DHCP can monitor and the distributing IP address network manager from centre junction point.When certain computer moves on to other position in the network, can receive new IP address automatically.
In traditional ethernet, client's access network is sought available Dynamic Host Configuration Protocol server by sending broadcast packet, and traditional SDN network is handled the flood mode consistent with traditional ethernet that adopt to broadcast packet.Be illustrated in fig. 1 shown below, the host A access network, outwards send dhcp message, switch S1 submits to controller with packet-in message, controller is resolved this event and is handled, S1 floods this dhcp message with packet-out message mode notice switch, this message is forwarded to switch S2, switch S2 submits to controller with message with the packet-in event again, controller continues processing mode as described above, so go down, be forwarded on each switch and produce S packet-in event (S is the number of switch in the network) up to this message.Along with the expansion of network size and the increase of broadcast packet data, not only waste a large amount of bandwidth resources, make that also the load of controller is overweight.
There is following drawback in the mode that floods in the OpenFlow network: 1) the controller load is overweight, any broadcast data packet will be flooded in the network in all switches, and in packet-in event of each switch triggering, expansion along with network size, with the increase of broadcast packet quantity, will produce huge control burden to controller; 2) datum plane bandwidth waste, any broadcast data packet floods at whole net, has not only increased the switch processes burden, the more important thing is the bandwidth resources of having wasted a large amount of preciousnesses; 3) loop can not appear in link, Ethernet is very responsive to loop, very easily cause broadcast storm, thereby existing solution adopts Spanning-Tree Protocol to avoid occurring loop with becoming a tree topology on the cellular logic mostly, yet Spanning-Tree Protocol has caused the waste of the network bandwidth, limited network throughput, reduced network robustness, in case network link breaks down nothing is backed up, the more important thing is when switch breaks down, the process that the generation tree is reruned continues 30-50 second usually, may influence proper network communication between this, even network paralysis occur; 4) increase the host side load, host network card receives all broadcast packets in the network, transfers to CPU and judges whether to issuing the packet of this machine, and then make and abandon or reply processing, wastes the calculating storage resources of this machine.
Summary of the invention
Technical problem to be solved by this invention provides a kind of dhcp broadcast processing method based on the SDN controller that reduces controller load and network traffics greatly.
For this reason, the dhcp broadcast processing method based on the SDN controller of the present invention, it may further comprise the steps:
1) when IP address pattern access SDN network is obtained in the host A employing automatically, outwards sends the DHCPDISCOVERY broadcast packet;
2) switch at first mates the stream table after receiving this broadcast packet, owing to there is not the stream list item of coupling, then can give controller with this broadcast packet with the form of packet-in event;
3) controller is received this message, resolves to draw the main frame positional information and be recorded to temporary table, selects a Dynamic Host Configuration Protocol server from the Dynamic Host Configuration Protocol server tabulation;
4) utilize the positional information of Dynamic Host Configuration Protocol server that the DHCPDISCOVERY broadcast packet that receives is packaged into packet-out message and be transmitted to switch S3;
5) after switch S3 receives this message, resolve and draw the DHCPDISCOVERY broadcast packet, forward from the port that connects Dynamic Host Configuration Protocol server X;
6) Dynamic Host Configuration Protocol server X responds a DHCPOFFER broadcast packet after receiving the DHCPDISCOVERY broadcast packet,
7) switch S3 submits to controller in the mode of packet-in message after receiving;
8) controller is resolved this packet-in message, extracts the chaddr field of DHCPOFFER broadcast packet, i.e. the MAC Address of source host, and from temporary table, search source host positional information (H (packet.chaddr) → Location) in the hash mode;
9) controller is packaged into packet-out message and is forwarded to switch S1 according to the main frame positional information that provides;
10) after switch S1 receives this message, parse the DHCPOFFER broadcast packet, and send out from the port that connects source host;
11) after host A is received DHCPOFFER, send a DHCPREQUEST broadcast packet again;
12) switch S1 issues controller with the packet-in message mode after receiving;
13) controller is resolved and is drawn the DHCPREQUEST broadcast packet, and the dhcp server ip address of service therefrom is provided, and upgrades the main frame position in the temporary table;
14) controller is searched the location message that draws Dynamic Host Configuration Protocol server according to the dhcp server ip address that the DHCPREQUEST broadcast packet extracts, and is packaged into packet-out message with this and is forwarded to switch S3;
15) switch S3 resolves this message, obtains the DHCPREQUEST broadcast packet, and is transmitted to Dynamic Host Configuration Protocol server X;
16) Dynamic Host Configuration Protocol server responds DHCPACK broadcast packet or DHCPNACK broadcast packet after receiving DHCPREQUEST;
17) switch S3 submits to controller in the mode of packet-in message again;
When 18) drawing the DHCPACK broadcast packet as if the controller parsing, IP address, the mac address information of extraction source main frame from DHCPACK, from temporary table, extract the positional information of main frame, requesting host information is registered in the main frame Basic Information Table, delete source host data entries in the temporary table simultaneously; If the DHCPNACK broadcast packet, source host data entries in the deletion temporary table;
19) this message is packaged into packet-out message and is forwarded to switch S1;
20) after switch S1 resolves packet-out message, broadcast packet is transmitted to source host.
Above-mentioned steps 3) when interim storage host information, adopts Hash table or data-base recording.
Above-mentioned steps 3) provide in the Dynamic Host Configuration Protocol server process of service in selection, adopt and select at random with average probability, perhaps polling mode is selected, and perhaps selects according to the load capacity of Dynamic Host Configuration Protocol server.
Above-mentioned steps 4) the switch S3 in is specified by the dpid in the packet-out message.
Above-mentioned steps 5) port of the Dynamic Host Configuration Protocol server X in is specified by the port of packet-out message.
Above-mentioned steps 18) when the storage host Basic Information Table, adopt key=IP address, value=[MAC address, dpid, port] the storage of a hash table, perhaps one or more Hash table storages of other conversion key and value, perhaps database mode storage.
Beneficial effect of the present invention:
1, dhcp broadcast is wrapped between source host and the Dynamic Host Configuration Protocol server as relaying with controller and transmit, eliminate the dhcp broadcast in the Ethernet fully, reduce the possibility that broadcast storm produces, reduced network traffics simultaneously.
2, reduced the controller load, tradition SDN controller needs a treatment S packet-in event to a broadcast packet, and (S is the number of switch, broadcast packet all can trigger a packet-in event on each switch), and the present invention only need handle a packet-in event, packet-in event complexity under the conventional process mode, packet-out message additionally be tabled look-up and be encapsulated to the present invention's event to be processed need, and its complexity all can be ignored.
3, when handling the dhcp broadcast bag, the present invention also records the essential information of main frame and upgrades, and to handling ARP request and network topology perception certain booster action is arranged.
Description of drawings
Fig. 1 is the schematic diagram of the dhcp broadcast bag of traditional SND processing procedure,
Fig. 2 is the schematic diagram of processing procedure of the present invention,
Fig. 3 is flow chart of the present invention.
Embodiment
The present invention can be applicable to campus network, enterprise network, data center network, and in the metropolitan area network, be based on SDN and solve the dhcp broadcast bag problem that floods, main passing through in controller end buffer memory Dynamic Host Configuration Protocol server position adopts the mode of packet-out message to transmit the dhcp broadcast bag between source host and Dynamic Host Configuration Protocol server, concrete step (seeing Fig. 2 and 3 for details) as follows in real time:
[1] host A outwards sends the DHCPDISCOVERY broadcast packet to obtain IP address pattern access network automatically;
[2] switch S1 receives the DHCPDISCOVERY broadcast packet, owing to there is not the stream list item of coupling, submits to controller so produce with packet-in message;
[3] controller is received this message, resolve draw the main frame positional information and be recorded to temporary table (as key=source host MAC Address, value=main frame position
1), from Dynamic Host Configuration Protocol server tabulation (storage organization is the key=DHCP server ip address, value=[MAC address, Dynamic Host Configuration Protocol server position]), select a Dynamic Host Configuration Protocol server (as adopting polling mode);
[4] positional information of utilizing Dynamic Host Configuration Protocol server is packaged into packet-out message with the DHCPDISCOVERY broadcast packet that receives and is transmitted to switch S3(and is specified by the dpid in the packet-out message);
[5] after switch S3 receives this message, resolve and draw the DHCPDISCOVERY broadcast packet, forward (port by packet-out message specifies) from the port that connects Dynamic Host Configuration Protocol server X;
[6] Dynamic Host Configuration Protocol server X responds a DHCPOFFER broadcast packet after receiving the DHCPDISCOVERY broadcast packet,
[7] submit to controller (reason with [2], follow-up do not giving unnecessary details) in the mode of packet-in message after switch S3 receives.
[8] controller is resolved this packet-in message, extracts the chaddr field (being the MAC Address of source host) of DHCPOFFER broadcast packet, and search source host positional information (H (packet.chaddr) → Location) in the hash mode from temporary table;
[9] controller is packaged into packet-out message and is forwarded to switch S1 according to the main frame positional information that provides;
[10] after switch S1 receives this message, parse the DHCPOFFER broadcast packet, and send out from the port that connects source host;
[11] after host A is received DHCPOFFER, send a DHCPREQUEST broadcast packet again;
[12] S1 issues controller with the packet-in message mode after receiving;
[13] controller is resolved and is drawn the DHCPREQUEST broadcast packet, and therefrom provide the dhcp server ip address of service, and the main frame position in the renewal temporary table is (under the actual conditions, sometimes source host may be sent out the DHCPREQUEST broadcast packet earlier, and whether inquiry IP address allocated last time can continue to use);
[14] controller is searched the location message that draws Dynamic Host Configuration Protocol server according to the dhcp server ip address that the DHCPREQUEST broadcast packet extracts, and is packaged into packet-out message with this and is forwarded to switch S3;
[15] switch S3 resolves this message, obtains the DHCPREQUEST broadcast packet, and is transmitted to Dynamic Host Configuration Protocol server X;
[16] Dynamic Host Configuration Protocol server responds DHCPACK broadcast packet or DHCPNACK broadcast packet after receiving DHCPREQUEST;
[17] switch S3 submits to controller in the mode of packet-in message;
When [18] drawing the DHCPACK broadcast packet as if the controller parsing, IP address, the mac address information of extraction source main frame from DHCPACK, from temporary table, extract the positional information of main frame, requesting host information is registered to (as shown in Figure 2) in the main frame Basic Information Table, deletes source host data entries in the temporary table simultaneously; If the DHCPNACK broadcast packet, source host data entries in the deletion temporary table;
[19] this message is packaged into packet-out message and is forwarded to switch S1.
[20] after switch S1 resolves packet-out message, broadcast packet is transmitted to source host.
Remarks: when the IP address of main frame was considered to arrange or changes, main frame sent the DHCPRELEASE packet, and submits to controller, and controller should be deleted corresponding host entry after resolving and obtaining this message.
In addition, the note among Fig. 1,2:
1, IP
A, IP
X, IP
YRepresent host A respectively, Dynamic Host Configuration Protocol server X, and the IP address information of Dynamic Host Configuration Protocol server Y;
2, DPID
1, DPID
2, DPID
3Represent switch S1 respectively, switch S2, and the data path id information of switch S3;
3, MAC
A, MAC
X, MAC
YRepresent host A respectively, the mac address information of Dynamic Host Configuration Protocol server X and Dynamic Host Configuration Protocol server Y.
4, PORT
A, PORT
X, PORT
YRepresent host A respectively, the port that Dynamic Host Configuration Protocol server X and Dynamic Host Configuration Protocol server Y link to each other with switch (switch end).
The concrete application approach of the present invention is a lot, and the above only is preferred implementation of the present invention, should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Claims (6)
1. dhcp broadcast processing method based on the SDN controller is characterized in that may further comprise the steps:
1) when IP address pattern access SDN network is obtained in the host A employing automatically, outwards sends the DHCPDISCOVERY broadcast packet;
2) switch at first mates the stream table after receiving this broadcast packet, owing to there is not the stream list item of coupling, then can give controller with this broadcast packet with the form of packet-in event;
3) controller is received this message, resolves to draw the main frame positional information and be recorded to temporary table, selects a Dynamic Host Configuration Protocol server from the Dynamic Host Configuration Protocol server tabulation;
4) utilize the positional information of Dynamic Host Configuration Protocol server that the DHCPDISCOVERY broadcast packet that receives is packaged into packet-out message and be transmitted to switch S3;
5) after switch S3 receives this message, resolve and draw the DHCPDISCOVERY broadcast packet, forward from the port that connects Dynamic Host Configuration Protocol server X;
6) Dynamic Host Configuration Protocol server X responds a DHCPOFFER broadcast packet after receiving the DHCPDISCOVERY broadcast packet,
7) switch S3 submits to controller in the mode of packet-in message after receiving;
8) controller is resolved this packet-in message, extracts the chaddr field of DHCPOFFER broadcast packet, i.e. the MAC Address of source host, and from temporary table, search source host positional information (H (packet.chaddr) → Location) in the hash mode;
9) controller is packaged into packet-out message and is forwarded to switch S1 according to the main frame positional information that provides;
10) after switch S1 receives this message, parse the DHCPOFFER broadcast packet, and send out from the port that connects source host;
11) after host A is received DHCPOFFER, send a DHCPREQUEST broadcast packet again;
12) switch S1 issues controller with the packet-in message mode after receiving;
13) controller is resolved and is drawn the DHCPREQUEST broadcast packet, and the dhcp server ip address of service therefrom is provided, and upgrades the main frame position in the temporary table;
14) controller is searched the location message that draws Dynamic Host Configuration Protocol server according to the dhcp server ip address that the DHCPREQUEST broadcast packet extracts, and is packaged into packet-out message with this and is forwarded to switch S3;
15) switch S3 resolves this message, obtains the DHCPREQUEST broadcast packet, and is transmitted to Dynamic Host Configuration Protocol server X;
16) Dynamic Host Configuration Protocol server responds DHCPACK broadcast packet or DHCPNACK broadcast packet after receiving DHCPREQUEST;
17) switch S3 submits to controller in the mode of packet-in message again;
When 18) drawing the DHCPACK broadcast packet as if the controller parsing, IP address, the mac address information of extraction source main frame from DHCPACK, from temporary table, extract the positional information of main frame, requesting host information is registered in the main frame Basic Information Table, delete source host data entries in the temporary table simultaneously; If the DHCPNACK broadcast packet, source host data entries in the deletion temporary table;
19) this message is packaged into packet-out message and is forwarded to switch S1;
20) after switch S1 resolves packet-out message, broadcast packet is transmitted to source host.
2. the dhcp broadcast processing method based on the SDN controller according to claim 1 is characterized in that step 3) adopts Hash table or data-base recording when interim storage host information.
3. the dhcp broadcast processing method based on the SDN controller according to claim 1, it is characterized in that step 3) provides in the Dynamic Host Configuration Protocol server process of service in selection, employing is selected at random with average probability, and perhaps polling mode is selected, and perhaps selects according to the load capacity of Dynamic Host Configuration Protocol server.
4. the dhcp broadcast processing method based on the SDN controller according to claim 1 is characterized in that the switch S3 in the step 4) is specified by the dpid in the packet-out message.
5. the dhcp broadcast processing method based on the SDN controller according to claim 1 is characterized in that the port of the Dynamic Host Configuration Protocol server X in the step 5) is by the port appointment of packet-out message.
6. the dhcp broadcast processing method based on the SDN controller according to claim 1, it is characterized in that step 18) employing key=IP address when the storage host Basic Information Table, the value=[MAC address, dpid, port] the storage of hash table, perhaps one or more Hash table storages of other conversion key and value, perhaps database mode storage.
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