WO2015085558A1

WO2015085558A1 - Method, device and system for dynamically allocating ip address

Info

Publication number: WO2015085558A1
Application number: PCT/CN2013/089291
Authority: WO
Inventors: 张习通
Original assignee: 华为技术有限公司
Priority date: 2013-12-12
Filing date: 2013-12-12
Publication date: 2015-06-18
Also published as: CN105917634A

Abstract

Disclosed are a method, device and system for dynamically allocating an IP address. The method comprises: a switch receiving a packet sent by a communication device which accesses the switch; when it is determined that the packet is a DHCP packet which is sent in a broadcasting manner, acquiring a routing address of a DHCP server corresponding to the communication device, and replacing a broadcasting address of a destination address field of the DHCP packet with the routing address of the DHCP server; and according to the routing address in the modified DHCP packet, routing the modified DHCP packet to the DHCP server. By means of the method, the DHCP packet can only be sent to the DHCP server rather than be broadcasted to all network devices within a broadcasting range, thereby solving the problem in the prior art that a large number of network resources are consumed due to the fact that the DHCP packet is sent to all the network devices within the broadcasting range in a broadcasting manner and the problem of high pressure placed on the performance of a server which need not receive the DHCP packet.

Description

Method, device and system for dynamically allocating IP address

Embodiments of the present invention relate to the field of network technologies, and, more particularly, to a method, apparatus, and system for dynamically allocating IP addresses. Background technique

Communication devices in the network must identify themselves on the network through an IP address when communicating with each other using the TCP/IP protocol. DHCP (Dynamic Hos t Conf s Protoco l) is a protocol for assigning IP addresses to communication devices.

In the existing technology for allocating an IP address to a communication device by using a DHCP protocol, all DHCP messages sent by the communication device to the DHCP server are broadcasted, such as a DHCPDISCOVER message, and a DHCPREQUEST (DHCP request). Messages, etc. Therefore, in the process of allocating IP addresses by using the DHCP protocol, a large number of broadcast packets are generated, which consumes a large amount of network resources and has a certain impact on the network environment. In addition, these broadcast packets are broadcast to the broadcast range in the second layer. All of the network devices, not just the DHCP server that needs to receive the message, put a lot of pressure on the performance of the server that does not need to receive the message.

SUMMARY OF THE INVENTION Embodiments of the present invention provide a method, an apparatus, and a system for dynamically allocating an IP address, which are used to solve the problem that a large amount of network resources are consumed by a DHCP message sent by a broadcast method in the prior art, and the DHCP message does not need to be received. The performance of the server creates a problem of greater stress.

The first aspect provides a method for dynamically allocating an IP address, where the method includes: receiving, by a switch, a packet sent by a communication device that accesses the switch;

The switch obtains a routing address of the DHCP server corresponding to the communication device, and replaces the broadcast address of the destination address field of the DHCP message with the broadcast address, when the packet is determined to be a broadcast DHCP message. The routing address of the DHCP server;

The switch will modify the DHCP according to the routing address in the modified DHCP message. The message is routed to the DHCP server.

In a first possible implementation manner of the first aspect, the routing address of the DHCP server includes an IP address and a MAC address of the DHCP server, and the switch sends a broadcast address of the destination address field of the DHCP message The routing address of the DHCP server is replaced by: the switch replaces the broadcast IP address of the destination IP address field of the DHCP packet with the IP address of the DHCP server, and uses the destination of the DHCP packet. The broadcast MAC address of the MAC address field is replaced with the MAC address of the DHCP server.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner, before the acquiring the routing address of the DHCP server, the switch further includes: the switch receiving the switch Route indication information sent by the controller of the communication, the route indication information includes a routing address of the DHCP server, and a route for instructing the switch to route the received DHCP message sent by the switch to the DHCP server. And the step of: obtaining the routing address of the DHCP server corresponding to the communication device, and replacing the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server, specifically: The routing address of the DHCP server is obtained, and the broadcast address of the destination address field of the DHCP packet is replaced with the routing address of the DHCP server according to the routing indication in the routing indication information.

With reference to the second possible implementation of the first aspect, in a third possible implementation, before the switch receives the routing indication information sent by the controller that communicates with the switch, the method further includes: After the communication device accesses the switch, the identifier of the communication device is sent to the controller; the routing indication information further includes a mapping relationship between the identifier of the communication device and a routing address of the DHCP server; Specifically, the switch is configured to: route, by the switch, a DHCP message sent by the communication device to the DHCP server, where the routing address of the DHCP server corresponding to the communication device is specifically included, Acquiring the identifier of the communication device in the DHCP message, and acquiring the routing address of the DHCP server corresponding to the identifier of the communication device according to the mapping relationship in the routing indication information.

In combination with the first aspect, the first to the third possible implementation of the first aspect, In the four possible implementation manners, the DHCP packet is specifically a DHCP discovery packet or a DHCP request packet.

The second aspect provides a method for dynamically allocating an IP address, where the method includes: the controller generates routing indication information, where the routing indication information includes a routing address of the DHCP server, and is used to indicate that the switch will receive the broadcast mode. The sent DHCP message is routed to the

Routing indication of the DHCP server;

The controller sends the routing indication information to a switch that communicates with the controller, so that when the switch receives the DHCP message sent by the broadcast, according to the DHCP server in the routing indication information The routing address routes the DHCP message to the DHCP server. In a first possible implementation manner of the second aspect, before the generating the routing indication information by the controller, the method further includes: the controller receiving the communication that is sent by the switch when the communications device accesses the switch An identifier of the device, and determining a DHCP server corresponding to the communication device; the routing indication information further includes a mapping relationship between the identifier of the communication device and a routing address of the DHCP server, where the routing indication is specifically used to indicate the switch Routing the DHCP message sent from the communication device to the DHCP server, so that: the switch receives the DHCP message that is sent by the communication device and includes the identifier of the communication device. And obtaining the routing address of the DHCP server according to the mapping relationship, and routing the DHCP packet to the DHCP server according to the routing address of the DHCP server.

In conjunction with the second aspect or the first possible implementation of the second aspect, in a second possible implementation manner, the routing address of the DHCP server includes an IP address and a MAC address of the DHCP server. A third aspect provides a method for dynamically allocating an IP address, where the method includes: receiving, by a switch, a packet sent by a communication device that accesses the switch;

When the switch determines that the packet is a DHCP message, the switch forwards the DHCP message to a controller that communicates with the switch, so that the controller sets the communication message according to the DHCP message. A DHCP service is available.

In a first possible implementation manner of the third aspect, before the switch forwarding the DHCP packet to the controller, the switch further includes: the switch receiving the indication information sent by the controller, where the indication information is And the switch is configured to forward the received DHCP message to the controller according to the indication information, and the switch performs, according to the indication information, forwarding the DHCP message to the control when determining that the packet is a DHCP message. Operation of the device.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner, the method further includes: accessing, by the communication device, the switch by using a port on the switch The switch sends the port number of the port to the controller; when the switch receives the data packet that is sent by the controller and carries the DHCP packet and the port number, the switch passes the data packet. The port identified by the port number sends the DHCP packet carried in the data packet to the communication device. A fourth aspect provides a method for dynamically allocating an IP address, where the method includes: the controller sends indication information to a switch that communicates with the controller, where the indication information is used to indicate that the switch will receive the DHCP report. Forwarding to the controller;

The controller receives the DHCP message forwarded by the switch to the controller when determining that the packet received by the communication device accessing the switch is a DHCP message according to the indication information; And providing a DHCP service to the communication device according to the DHCP message.

In a first possible implementation manner of the fourth aspect, the method further includes: the controller receiving, by the switch, when the communications device accesses the switch through a port on the switch The port number of the port; the controller providing the DHCP service to the communication device according to the DHCP message, specifically, the controller constructs a DHCP message including data corresponding to the DHCP service, and constructs a DHCP message. And the port number is encapsulated into a data packet and sent to the switch, so that the switch sends the DHCP packet carried by the data packet to the port identified by the port number in the data packet. The communication device. A fifth aspect provides a switch, where the switch includes: a receiving unit, a processing unit, and a routing unit;

The receiving unit is configured to receive a packet sent by the communication device that accesses the switch, and is further configured to send the received packet to the processing unit;

The processing unit is configured to receive the packet from the receiving unit, and obtain a routing address of a DHCP server corresponding to the communication device when the packet is determined to be a DHCP message sent by the broadcast device, where the The broadcast address of the destination address field of the DHCP packet is replaced with the routing address of the DHCP server, and the modified DHCP packet is sent to the routing unit.

The routing unit is configured to receive the modified DHCP message from the processing unit, and route the modified DHCP message to the DHCP according to the routing address in the modified DHCP message server.

In a first possible implementation manner of the fifth aspect, the routing address of the DHCP server includes an IP address and a MAC address of the DHCP server, and the processing unit is configured to: use the destination address field of the DHCP message The replacing the broadcast address with the routing address of the DHCP server includes: the processing unit is configured to replace the broadcast IP address of the destination IP address field of the DHCP packet with the IP address of the DHCP server, and the DHCP The broadcast MAC address of the destination MAC address field of the message is replaced with the MAC address of the DHCP server.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in a second possible implementation, the receiving unit is further configured to receive routing indication information sent by a controller that communicates with the switch, where The routing indication information includes a routing address of the DHCP server, and a routing indication for instructing the switch to route the received DHCP message to the DHCP server; the processing unit is configured to determine When the packet is a DHCP message, the routing address of the DHCP server corresponding to the communication device is obtained, and the broadcast address of the destination address field of the DHCP packet is replaced with the routing address of the DHCP server. The processing unit is configured to: obtain the routing address of the DHCP server from the routing indication information, and replace the broadcast address of the destination address field of the DHCP packet with the routing indication in the routing indication information. The routing address of the DHCP server. With reference to the second possible implementation manner of the fifth aspect, in a third possible implementation, the switch further includes an access unit, where the access unit is configured to access the switch in the communications device And sending the identifier of the communication device to the controller; the routing indication information further includes a mapping relationship between the identifier of the communication device and a routing address of the DHCP server, where the routing indication is specifically used to indicate the switch And transmitting, by the processing unit, the routing address of the DHCP server that is sent by the communication device to the DHCP server. The processing unit is configured to acquire a routing address of the DHCP server corresponding to the communication device, where the processing unit includes: Acquiring the identifier of the communication device from the DHCP message, and acquiring a routing address of the DHCP server corresponding to the identifier of the communication device according to the mapping relationship in the routing indication information. According to a sixth aspect, a controller is provided, where the controller includes a generating unit and a sending unit, and the generating unit is configured to generate routing indication information, where the routing indication information includes a routing address of the DHCP server, and is used for indicating The switch routes the received DHCP message sent by the broadcast to the routing instruction of the DHCP server, and sends the route indication information to the sending unit.

The sending unit is configured to receive the routing indication information from the generating unit, and is further configured to send the routing indication information to a switch that communicates with the controller, so that the switch receives the broadcast manner The DHCP message is routed to the DHCP server according to the routing address of the DHCP server in the routing indication information.

In a first possible implementation manner of the sixth aspect, the controller further includes a receiving unit, where the receiving unit is configured to receive the communication that is sent by the switch when the communications device accesses the switch An identifier of the device, and configured to send the identifier of the communication device to the determining unit, where the generating unit is further configured to receive an identifier of the communications device from the receiving unit, and determine, corresponding to the communications device The routing information generated by the generating unit further includes a mapping relationship between the identifier of the communications device and the routing address of the DHCP server, where the routing indication is specifically used to indicate that the switch is to be received from the communications device. The broadcasted DHCP message is routed to the DHCP server, so that: the switch receives the communication device When the DHCP message containing the identifier of the communication device is sent, the routing address of the DHCP server is obtained according to the mapping relationship, and the DHCP message is routed to the DHCP according to the routing address of the DHCP server. server.

In conjunction with the sixth aspect or the first possible implementation manner of the sixth aspect, in a second possible implementation manner, the routing address of the DHCP server includes an IP address and a MAC address of the DHCP server. According to a seventh aspect, a switch is provided, where the switch includes a receiving unit and a forwarding unit, and the receiving unit is configured to receive a packet sent by a communication device that accesses the switch, and send the packet to the Forwarding unit

The forwarding unit is configured to receive the packet from the receiving unit, and forward the DHCP packet to a controller that communicates with the switch when determining that the packet is a DHCP message, so that the The controller provides a DHCP service for the communication device according to the DHCP message.

In a first possible implementation manner of the seventh aspect, the receiving unit is further configured to receive the indication information sent by the controller, where the indication information is used to instruct the switch to forward the received DHCP message to the The forwarding unit is configured to perform, according to the indication information, an operation of forwarding the DHCP message to the controller when determining that the message is a DHCP message.

With reference to the seventh aspect, or the first possible implementation manner of the seventh aspect, in a second possible implementation, the switch further includes an access unit, where the access unit is configured to pass the communication device When the port on the switch accesses the switch, the port number of the port is sent to the controller; the receiving unit is further configured to receive the DHCP packet sent by the controller and the port number Data packet, and the data packet is sent to the forwarding unit; the forwarding unit is further configured to receive the data packet from the receiving unit, and pass the port number in the data packet The identified port sends the DHCP packet carried by the data packet to the communication device. In an eighth aspect, a controller is provided, where the controller includes a sending unit, a receiving unit, and a service unit; The sending unit is configured to send, to the switch that communicates with the controller, the indication information, where the indication information is used to instruct the switch to forward the received DHCP message to the controller;

The receiving unit is configured to receive, by the switch, the DHCP message that is forwarded to the controller when the packet received by the communication device that accesses the switch is a DHCP message according to the indication information, and is used by the switch. Sending the DHCP message to the service unit;

The service unit is configured to receive the DHCP message from the receiving unit, and configured to provide a DHCP service for the communication device according to the DHCP message.

In a first possible implementation manner of the eighth aspect, the receiving unit is further configured to receive, by the switch, the port that is sent when the communications device accesses the switch through a port on the switch a port number, and configured to send the port number to the service unit; the service unit is further configured to receive the port number from the receiving unit; the service unit is configured to use the DHCP message as the The providing the DHCP service by the communication device includes: the service unit is configured to construct a DHCP message including the data corresponding to the DHCP service, and the configured DHCP message and the port number are encapsulated into the data message, and are used for Sending the data packet to the sending unit; the sending unit is further configured to receive the data packet from the serving unit, and send the data packet to the switch, so that the switch Sending, by the port identified by the port number in the data packet, the DHCP packet carried by the data packet to the communication device. According to a ninth aspect, a communication system is provided, where the communication system includes a switch and a controller, and the switch and the controller communicate through a network;

The controller is configured to generate routing indication information, where the routing indication information includes a routing address of the DHCP server, and a routing indication for instructing the switch to route the received DHCP message sent by the switch to the DHCP server. And is further configured to send the routing indication information to the switch;

The switch is configured to receive a packet sent by a communication device that accesses the switch, and obtain the DHCP server from the routing indication information when determining that the packet is a DHCP message sent by the broadcast mode. Routing the address, and according to the routing indication in the routing indication information, the DHCP The broadcast address of the destination address field of the packet is replaced with the routing address of the DHCP server, and is also used to route the modified DHCP packet to the DHCP server according to the routing address in the modified DHCP packet.

In a first possible implementation manner of the ninth aspect, the routing address of the DHCP server includes an IP address and a MAC address of the DHCP server, and the switch is configured to use the destination address field of the DHCP message The replacement of the broadcast address with the routing address of the DHCP server includes: the switch is configured to replace the broadcast IP address of the destination IP address field of the DHCP packet with the IP address of the DHCP server, and the The broadcast MAC address of the destination MAC address field of the DHCP message is replaced with the MAC address of the DHCP server.

With reference to the ninth aspect, or the first possible implementation manner of the ninth aspect, in a second possible implementation, the switch is further configured to: after the communications device accesses the switch Sending the identifier of the communication device; the controller is further configured to determine a DHCP server corresponding to the communication device, where the routing indication information generated by the controller further includes an identifier of the communication device and the DHCP server a routing address mapping relationship, where the routing indication is specifically used to instruct the switch to route a DHCP message sent by the communication device to the DHCP server; the switch is configured to acquire the communication device. The routing address of the corresponding DHCP server includes: the switch is configured to obtain the identifier of the communication device from the DHCP packet, and obtain the identifier corresponding to the identifier of the communication device according to the mapping relationship in the routing indication information. The routing address of the DHCP server. According to a tenth aspect, a communication system is provided, where the communication system includes a switch and a controller, and the switch and the controller communicate through a network;

The controller is configured to send indication information to the switch, where the indication information is used to instruct the switch to forward the received DHCP message to the controller;

The switch is configured to forward the DHCP message to the controller when determining that the packet is a DHCP message according to the indication information;

The controller is further configured to provide a DHCP service for the communication device according to the DHCP message. In a first possible implementation manner of the tenth aspect, the switch is further configured to: when the communications device accesses the switch through a port on the switch, send the port to the controller The port number is provided by the controller to provide the DHCP service to the communication device according to the DHCP message, the controller includes: constructing a DHCP message including data corresponding to the DHCP service, and configuring the DHCP message and The port number is encapsulated into a data packet and sent to the switch; the switch is further configured to send the DHCP packet carried by the data packet to the port identified by the port number in the data packet. The communication device.

According to the embodiment of the present invention, when the switch receives the DHCP message sent by the communication device in a broadcast manner, the broadcast address in the DHCP message is replaced with the corresponding address of the communication device.

The routing address of the DHCP server is only sent to the DHCP server, instead of broadcasting the message to all network devices in the broadcast range, thereby solving all the broadcasts in the prior art. The problem that the network device sends a large amount of network resources caused by sending DHCP messages, and the performance of the server that does not need to receive the DHCP message is greatly stressed. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are merely Some embodiments of the present invention may also be used to obtain other drawings based on these drawings without departing from the prior art.

1 is a schematic structural diagram of a networking of a communication system according to an embodiment of the present invention;

2 is a schematic diagram of a networking structure of an SDN-based communication system according to an embodiment of the present invention; FIG. 3 is a schematic flowchart of a method provided by Embodiment 1 of the present invention;

5-6 is a schematic flowchart of a method provided by Embodiment 2 of the present invention;

7 is a schematic structural diagram of a switch according to Embodiment 3 of the present invention;

8 is a schematic structural diagram of a controller according to Embodiment 4 of the present invention;

9 is a schematic structural diagram of a switch according to Embodiment 5 of the present invention;

FIG. 10 is a schematic structural diagram of a controller according to Embodiment 6 of the present invention; FIG.

11 is a schematic structural diagram of a switch according to Embodiment 7 of the present invention; FIG. 12 is a schematic structural diagram of a controller according to Embodiment 8 of the present invention; FIG.

FIG. 13 is a schematic structural diagram of a switch according to Embodiment 9 of the present invention;

14 is a schematic structural diagram of a controller according to Embodiment 10 of the present invention;

15 is a schematic structural diagram of a communication system according to Embodiment 11 of the present invention;

Figure 16 is a block diagram showing the structure of a communication system according to Embodiment 12 of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without making creative labor are within the scope of the present invention.

FIG. 1 is a schematic structural diagram of a networking of a communication system according to an embodiment of the present invention.

The communication system includes a switch 110 and a communication device 120, wherein the communication device 120 is coupled to the switch 110 and communicates with other network devices via the switch 110, such as a DHCP server 150 corresponding to the communication device 120.

Based on the communication system, in the first embodiment of the present invention, the communication device 120 sends a DHCP message to the DHCP server 150 in a broadcast manner, and after receiving the DHCP message, the switch 110 acquires a DHCP server corresponding to the communication device 120, and The broadcast address of the destination address field in the DHCP message is replaced with the routing address of the DHCP server 150, and the modified DHCP message is routed to the DHCP server 150.

The communication system can also include a controller (Cont roler) 1 30, wherein the controller 130 communicates with the switch 110 over a network.

Based on the communication system, in the first embodiment of the present invention, the controller 1 30 is configured to generate routing indication information, and send the routing indication information to the switch 110, where the routing indication information includes a routing address of the DHCP server 150, and A routing indication for instructing the switch 110 to route the received broadcasted DHCP message to the DHCP server 150. The switch 110 receives the road After receiving the DHCP message sent by the communication device 120 in the broadcast mode, the DHCP message is routed to the DHCP server 150 according to the routing address of the DHCP server 150.

Based on the communication system, in the first embodiment of the present invention, the controller 130 is configured to generate the indication information and send the indication information to the switch 110, where the indication information is used to instruct the switch 110 to forward the received DHCP message to the control. 130. After receiving the indication information, the switch 110 forwards the received DHCP message to the controller 130 when receiving the DHCP message sent by the communication device 120, and the controller 130 provides the communication device 120 with the DHCP according to the DHCP message. service.

FIG. 1 is a schematic diagram of a networking structure of a communication system based on an SDN (software defined network) according to an embodiment of the present invention. The communication system can be specifically a data center system. The switch 110 and the controller 130 can communicate via the openf 1 ow protocol.

The switch 110 may be a virtual switch, such as the V-switch 110-1 in FIG. 1 or a physical switch, such as P_switch 110-2 and P_switch 110-3 in FIG. 2 . . The communication device 120 may be a virtual machine connected to the virtual switch, such as VM 120-1 and VM 120-2 in FIG. 2, or a physical host connected to the physical switch, such as Host 120-3 in FIG. Host 120-4 and Host 120-5.

In a specific implementation example of Embodiment 1 of the present invention, the controller 130 sends routing indication information to the V-switch 110-1, where the routing indication information includes a routing address of the DHCP server 150, and is used to indicate the V-switch 110. -1 routes the received DHCP message sent by the broadcast to the DHCP server 150. When receiving the DHCP message sent by the VM 120-1 in the broadcast mode, the V_switch 110-1 routes the DHCP message to the DHCP server 150 according to the routing address of the DHCP server 150 in the routing indication information. FIG. 3 is a schematic flowchart of a method according to Embodiment 1 of the present invention. The method of Embodiment 1 of the present invention can be applied to the communication system shown in FIG. 1 or FIG.

According to Embodiment 1 of the present invention, the switch transmits the communication device accessing the switch in a broadcast manner. The destination address of the DHCP message is replaced with the routing address of the DHCP server corresponding to the communication device, and the modified DHCP message is routed to the DHCP server.

As shown in FIG. 3, the method provided in Embodiment 1 of the present invention includes: Step 210: A switch receives a packet sent by a communication device that accesses the switch.

The communication device further includes: the communication device accessing the switch through a port on the switch before sending the message.

Step 220: The switch acquires a routing address of the DHCP server corresponding to the communication device when the packet is a DHCP message sent by the broadcast, and replaces the broadcast address of the destination address field of the DHCP packet. Is the routing address of the DHCP server;

The value of the destination address field of the DHCP message sent by broadcast is the broadcast address. Specifically, the destination address field includes a destination IP address field and/or a destination MAC address field, where the value of the destination IP address field is a broadcast IP address, such as 255. 255. 255. 255, and the destination MAC address field is a broadcast MAC address. Address, such as ff: ff: ff : ff: ff : ff. The switch can determine whether the DHCP message is a broadcast message according to whether the broadcast address is recorded in the destination address field in the DHCP message. The DHCP message sent by the broadcast may be a DHCPDI SC0VER packet or a DHCPREQUEST packet.

Correspondingly, the routing address of the DHCP server acquired by the switch includes an IP address and/or a MAC address of the DHCP server. After the IP address and/or the MAC address is obtained, the switch sends the DHCP packet. The broadcast IP address of the destination IP address field is replaced with the IP address of the DHCP server, and/or the broadcast MAC address of the destination MAC address field of the DHCP message is replaced with the MAC address of the DHCP server.

Preferably, the DHCP message includes an identifier of the communication device, and the switch may acquire the mapping relationship between the identifier of the communication device and the routing address of the DHCP server corresponding to the communication device. Identify the routing address of the corresponding DHCP server. The identifier of the communication device may be a MAC address of the communication device or a port number of the port.

Step 230: The switch performs the modification according to the routing address in the modified DHCP packet. The subsequent DHCP message is routed to the DHCP server. Preferably, before the step 220, the controller may further include: the controller generates routing indication information, and sends the routing indication information to the switch, where the routing indication information includes a routing address of the DHCP server, and is used to indicate that the switch will receive The DHCP message sent by the broadcast route is routed to the DHCP server. Correspondingly, the step 220 includes: the switch acquiring the routing address of the DHCP server from the routing indication information, and broadcasting the destination address field of the DHCP packet according to the routing indication in the routing indication information The address is replaced with the routing address of the DHCP server.

Preferably, the switch sends the identifier of the communication device to the controller after the communication device accesses the switch. Before the generating the routing indication information, the controller further includes: the controller determining a DHCP server corresponding to the communication device, and correspondingly, the generated routing indication information further includes an identifier and a location of the communication device The routing relationship of the routing address of the DHCP server is used to: the routing indication is specifically used to instruct the switch to route the DHCP message sent by the communication device to the DHCP server. Correspondingly, in step 220, the switch acquires the identifier of the communication device from the DHCP message, and obtains the DHCP server corresponding to the identifier of the communication device according to the mapping relationship in the route indication information. Routing address.

According to the first embodiment of the present invention, when the switch receives the DHCP message sent by the communication device in a broadcast manner, the broadcast address in the DHCP message is replaced with the routing address of the DHCP server corresponding to the communication device. Therefore, the DHCP message is sent only to the DHCP server, instead of broadcasting the message to all network devices in the broadcast range, thereby solving the problem in the prior art that the DHCP message is sent to all network devices in the broadcast range by the broadcast mode. The problem caused by a large amount of consumption of network resources and the pressure on the performance of a server that does not need to receive the DHCP message. Embodiment 1 of the present invention will be described in detail below with reference to FIG.

Step 301: When the communication device accesses the switch, the switch sends the identifier of the communication device to a controller that communicates with the switch. The switch and the controller can communicate through the openf low protocol.

Taking the communication system shown in FIG. 2 as an example, VM 120-1 accesses V-swi tch 110-1 through port 1234 of V_swi tch 110-1, and V-swi tch 110-1 sends port number 1234 to controller 130.

Step 302: The controller generates routing indication information, and sends the routing indication information to the switch, where the routing indication information includes a MAC address and an IP address of the DHCP server, and is used to indicate that the switch will receive the broadcast mode. The DHCP message sent is routed to the routing indication of the DHCP server.

When the controller and the switch are devices that support the openf low protocol, the routing indication information may be an openf low flow table, as shown in Table 1:

Table 1

The openf low flow table is used to indicate that when the received message satisfies the condition set by the matching field, the action set in the action field is executed. The matching field ( mat ch f ie ld ) may also be referred to as a header field (header f ie ld ).

For the openf low flow table shown in Table 1, the conditions set by the matching field are the conditions that must be met for the DHCP message sent by the broadcast mode. The action set by the action field includes: The destination MAC of the message that meets the condition The address is replaced with the MAC address of the specified DHCP server, which will satisfy the condition of the packet. The destination IP address is replaced with the IP address of the specified DHCP server, and the packets are forwarded according to the behavior of the Layer 2 or Layer 3 switch. Correspondingly, after receiving the flow table, the switch determines that the received message meets the condition set by the matching domain, that is, when the received message is determined to be a DHCP message sent by the broadcast mode, Replace the destination MAC address of the packet with the MAC address of the specified DHCP server, replace the destination IP address of the packet with the IP address of the specified DHCP server, and forward the modified DHCP according to the normal Layer 2/Layer 3 switch behavior. Message.

Taking Table 1 as an example, the fields of the matching domain include the transport layer source port number (tp_ src ), the transport layer destination port number (tp_ds t ), the data link layer packet type ( dl _ type ), and the network layer protocol type ( nw .proto ), destination MAC address ( dl _ds t ) and destination IP address ( _ds t), when the transport layer source port number is 68 in the received message, the transport layer destination port number is 67, the data link If the packet type is 0x0800 and the network layer protocol type is 17, you can determine that the packet is a DHCP packet. When the destination MAC address of the packet is ff: ff: ff: ff: ff: ff, destination IP address 255. 255. 255. 255, the packet can be further determined to be a DHCP message sent by broadcast. The mod_dl _ds t=dhcp server mac set in the action field in Table 1 is used to indicate that the destination MAC address in the packet that meets the condition is replaced with dhcp server mac (the MAC address of the DHCP server), and the mod_nw_ds t=dhcp server is set. Ip is used to indicate that the destination IP address in the text is replaced with the dhcp server ip (the IP address of the DHCP server). The configured Norma is used to forward the modified packet to the normal Layer 2 or Layer 3 switch. Go out.

Further, the matching field of the flow table shown in Table 1 may further include an identifier of the communication device, to indicate that the action domain setting is performed when receiving the DHCP message sent by the communication device in a broadcast manner. action.

It should be noted that, if the controller generates the route indication information in step 302, the identifier of the communication device is needed, step 302 is performed after step 301, and if it is not needed, step 302 may also be step 301. Executed before.

Step 303: The communications device sends a DHCPDISCOVER packet in a broadcast manner.

It should be noted that the DHCP messages sent by the communication device are all sent by a DHCP client installed on the communication device. Specifically, when the DHCP client starts, the DHCP client The client broadcasts a DHCPDI SCOVER message in the subnet where the communication device is located.

The DHCPDI SCOVER 4 message is used to apply for an IP address.

Step 304: The switch receives the DHCPDI SCOVER message, and uses the received routing indication information to determine that the DHCPDI SCOVER message is a DHCP message sent by broadcast, and then the DHCPDI SCOVER is The destination MAC address is replaced with the MAC address of the DHCP server in the routing indication information, and the destination IP address of the DHCPDI SCOVER message is replaced with the IP address of the DHCP server in the routing indication information.

Taking Table 1 as an example, if the switch determines that the DHCPDI SCOVER message satisfies the matching field of the flow table in Table 1, replace the destination MAC address in the DHCPDI SCOVER 4 with the dhcp server mac, and the DHCPDI SCOVER Replace the destination IP address in the packet with dhcp server ip.

Step 305: The switch forwards the modified DHCPD I SC0VER 4 message.

The DHCPID SCOVER message is directly routed to the DHCP server because the destination IP address of the modified DHCPDI SCOVER message is the IP address of the DHCP server and the destination MAC address is the MAC address of the DHCP server.

Step 306: After receiving the DHCPDI SCOVER message, the DHCP server allocates an IP address that has not been allocated to the communication device from the IP address range of the communication device, and temporarily marks the assigned IP address as unavailable. use.

Step 307: The DHCP server returns a DHCPOFFER (DHCP Provisioning) message to the communication device by using the switch, where the DHCPOFFER message includes an assigned IP address.

Step 308: After receiving the DHCPOFFER message, the communication device sends a DHCPREQUEST packet including the IP address in a broadcast manner.

Step 309: The switch receives the DHCPREQUEST message, and uses the received routing indication information to determine that the DHCPREQUEST packet is a DHCP message sent by the broadcast, and then the destination MAC address of the DHCPREQUEST message is Replacing the MAC address of the DHCP server in the routing indication information, and replacing the destination IP address of the DHCP REQUEST message with the IP address of the DHCP server in the routing indication information;

Step 310: The switch forwards the modified DHCPREQUEST packet. Figure 3 to broadcast DHCP allocation IP process (example 1)

The message is then routed directly to the DHCP server.

Step 311: The DHCP server returns a DHCPACK (DHCP acknowledgment) message to the communication device by using the switch, where the DHCP ACK includes the IP address and configuration parameters of the IP address.

After receiving the DHCPACK packet containing the configuration parameter, the communication device uses the ARP packet to detect whether other network devices on the network are using the IP address. If it is confirmed that no other network device is using the IP address on the network, the communication device accepts the IP address and its configuration parameters, and if it is found that other network devices are using the IP address, the communication device sends the IP address to the DHCP server. DHCPDECLINE message, and resend the DHCPDISC0VER message to apply for an IP address. After receiving the DHCPDECLINE message, the DHCP server marks the IP address as unavailable.

Step 312: When the communication device no longer needs to use the IP address, the device may actively send a DHCPRELEASE message to the DHCP server to release the IP address. FIG. 5 is a schematic flowchart of a method according to Embodiment 2 of the present invention. The method of Embodiment 2 of the present invention can be applied to the communication system shown in FIG. 1 or FIG.

According to Embodiment 2 of the present invention, the switch forwards all DHCP messages sent by the communication device accessing the switch to the controller, and the controller provides a DHCP service for the communication device (if the IP address is assigned to the communication device, the switch does not The communication device provides configuration parameters of the assigned IP address, releases the assigned IP address, etc.).

As shown in FIG. 5, the method provided in Embodiment 2 of the present invention includes: Step 410: A communications device sends a packet to a switch accessed by the communications device;

Step 420: The switch forwards the DHCP message to a controller that communicates with the switch when determining that the packet is a DHCP message.

The DHCP message may be specifically DHCPDISC0VER 4, DHCPREQUEST 4 or

DHCPRELEASE message. Step 430: The controller provides a DHCP service for the communication device according to the DHCP message. Specifically, when the DHCP message is a DHCPDISC0VER message, the controller allocates an IP address to the communication device; when the DHCP message is a DHCPREQUEST message, the controller sends the message to the communication The device provides configuration parameters for the IP address assigned to the communication device; when the 0? When the message is 0^?1^1^^£4, the controller releases the IP address assigned to the communication device.

Before the step 420, the switch may further include: the switch receiving the indication information sent by the controller, where the indication information is used to instruct the switch to forward the received DHCP message to the controller. Correspondingly, the step 420 specifically includes: the switch performing, according to the indication information, an operation of forwarding the DHCP message to the controller when determining that the packet is a DHCP message.

Further, when the communication device accesses the switch through a port on the switch, the switch sends a port number of the port to the controller. Correspondingly, the step 430 may include: the controller constructs a DHCP message including data corresponding to the DHCP service, and encapsulates the constructed DHCP message and the port number into a data packet and sends the packet to the switch. And sending, by the switch, the DHCP message carried by the data packet to the communication device by using the port identified by the port number in the data packet. Specifically, when the DHCP message received by the controller is a DHCPDISCOVER message, the DHCP message configured by the controller is a DHCPOFFER message, and the DHCPOFFER message includes the data corresponding to the DHCP service. Including the IP address assigned by the controller to the communication device; when the DHCP message received by the controller is a DHCPREQUEST message, the DHCP message constructed by the controller is a DHCPACK message, The data corresponding to the DHCP service included in the DHCPACK message includes configuration parameters of an IP address allocated by the controller for the communication device.

According to Embodiment 2 of the present invention, when the switch receives the DHCP message sent by the communication device, the DHCP message is forwarded to a controller that communicates with the switch, so that the controller is configured according to the The DHCP message provides a DHCP service for the communication device. Therefore, the DHCP message is sent only to the controller, and the controller provides the DHCP service to the communication device instead of broadcasting the message to all network devices in the broadcast range, thereby solving the problem in the prior art. Broadcaster The problem of a large amount of network resource consumption caused by sending DHCP messages to all network devices in the broadcast range, and the problem of the performance of the server that does not need to receive the DHCP message.

Embodiment 2 of the present invention will be described in detail below with reference to FIG.

Step 501: When the communication device accesses the switch through a port on the switch, the switch sends the port number of the port to a controller that communicates with the switch.

The switch and the controller can communicate through the openf low protocol.

Step 502: The controller sends indication information to each switch that communicates with the controller, where the indication information is used to instruct the switch to forward the received DHCP message to the controller.

When the controller and the switch are devices that support the openf low protocol, the indication information may be specifically an _ope nf low flow table, as shown in Table 2:

Table 2

As shown in the openf low flow table shown in Table 2, the condition set by the matching field is a condition that the DHCP message needs to meet; the action set in the action field includes: forwarding the message satisfying the condition to the controller. Correspondingly, after receiving the flow table, the switch forwards the HDCP packet when it determines that the received packet meets the condition set by the matching domain, that is, when the received packet is a DHCP packet. Give the controller.

Taking Table 2 as an example, the fields of the matching domain include the transport layer source port number (tp_src), the transport layer destination port number (tp_ds t ), the data link layer packet type (d l _ type ), and the network layer protocol type.

(丽_proto), when the transport layer source port number in the received message is 68, the transport layer destination port number is 67, the data link layer packet type is 0x0800, and the network layer protocol type is 17, then it can be determined. The packet is a DHCP packet. The value "cont rol ler" of the act ions field of the action field in Table 2 is used to indicate that the message satisfying the condition is forwarded to the controller.

Step 503: The communication device sends a DHCPDISCOVER message in a broadcast manner. It should be noted that the DHCP messages sent by the communication device are all sent by a DHCP client installed on the communication device. Specifically, when the DHCP client starts, the DHCP client The client broadcasts DHCPDI SC0VER 4 in the subnet where the communication device is located.

The DHCPDI SC0VER 4 text is used to apply for an IP address.

The DHCPDI SC0VER 4 message is used to apply for an IP address.

Step 504: The switch receives the DHCPDI SC0VER, according to the indication information - determining the DHCPDI SC

Forward to the operation of the controller.

Taking Table 2 as an example, if the switch determines that the DHCPDI SC0VER message satisfies the condition of the matching field of the flow table in Table 2, the DHCPDI SC0VER is forwarded to the controller.

Specifically, the switch encapsulates the DHCPDI SC0VER 4 by using the openf low protocol, and sends the encapsulated DHCPDI SC0VER 4 message to the controller through a secure channel between the switch and the controller (secure channe l ). .

Step 505: The controller allocates an available IP to the communication device according to the allocation algorithm, constructs a DHCPOFFER message including the IP address, and encapsulates the DHCPOFFER message and the port number received in step 301 in the data packet.

The data may specifically be a send-packe t message of the openf low protocol.

Step 506: The controller sends the data packet to the switch.

Step 507: The switch sends the DHCPOFFER message carried by the data packet to the communication device by using the port identified by the port number in the data packet.

Step 508: After receiving the DHCPOFFER message, the communication device sends a DHCPREQUEST packet including the IP address in a broadcast manner.

Step 509: The switch receives the DHCPREQUEST packet, and performs an operation of forwarding the DHCPREQUEST packet to the controller when determining that the DHCPREQUEST packet is a DHCP message according to the indication information.

Taking the table 2 as an example, the switch determines that the DHCPREQUEST message satisfies the condition of the matching field of the flow table in Table 2, and forwards the DHCPREQUEST message to the controller.

Specifically, the switch encapsulates the DHCPREQUEST 4 by using the openf low protocol, and the A secure channel between the switch and the controller sends the encapsulated DHCPREQUEST message to the controller.

Step 510: The controller constructs a DHCPACK packet, and encapsulates the DHCPACK packet and the port number in a data packet and sends the packet to the switch, where the DHCPACK packet includes the IP address and the IP address. Configuration parameter

Step 511: The controller sends the data packet generated in step 510 to the switch.

Step 512: After receiving the data packet, the switch sends the DHCPACK message carried by the data packet to the communication device by using the port identified by the port number in the data packet.

The communication device receives the DHCPACK packet containing the configuration parameter, and uses the ARP packet to detect whether the other network device on the network is using the IP address. If it is confirmed that no other network device is using the IP address on the network, the communication device accepts the IP address and its configuration parameters. If another network device is found to be using the IP address, the communication device sends a DHCPDECLINE message and resends the DHCPDI SC0VER 4 message requesting an IP address. After receiving the DHCPDECLINE message, the switch uses the received indication information to determine that the DHCPDECLINE message is a DHCP message, and forwards the DHCPDECLINE message to the controller, where the controller After receiving the DHCPDECLINE message, the IP address is marked as unavailable.

When the communication device no longer needs to use the IP address, it can actively send a DHCPRELEASE message to release the IP address. After receiving the DHCPRELEASE message, the switch uses the received indication information to determine that the DHCPRELEASE message is a DHCP message, and forwards the DHCPRELEASE message to the controller, where the controller receives After the DHCPRELEASE message is sent, the IP address is released. According to Embodiment 1 of the present invention, Embodiment 3 of the present invention proposes a switch 500. As shown in FIG. 7, the switch 500 includes: a receiving unit 501, a processing unit 502, and a routing unit 503. The receiving unit 501 is configured to receive the packet sent by the communication device that accesses the switch, and is further configured to send the received packet to the processing unit 502.

The processing unit 502 is configured to receive the packet from the receiving unit 501, and obtain a routing address of the DHCP server corresponding to the communication device when the packet is determined to be a DHCP message sent by the broadcast, and the DHCP message is sent. The broadcast address of the destination address field is replaced with the routing address of the DHCP server, and the modified DHCP message is sent to the routing unit 503;

The routing unit 503 is configured to receive, by the processing unit 502, the modified DHCP message, and route the modified DHCP message according to the routing address in the modified DHCP message to the

DHCP server. In a specific implementation manner, the routing address of the DHCP server includes an IP address and a MAC address of the DHCP server; and the processing unit 502 is configured to: broadcast a destination address field of the DHCP message The replacement of the routing address of the DHCP server includes: the processing unit 502 is configured to replace the broadcast IP address of the destination IP address field of the DHCP message with the IP address of the DHCP server, and the DHCP message is The broadcast MAC address of the destination MAC address field is replaced with the MAC address of the DHCP server.

The receiving unit may be further configured to receive routing indication information sent by a controller that is in communication with the switch, where the routing indication information includes a routing address of the DHCP server, and is used to indicate that the switch will receive the broadcast mode. The routing information of the DHCP server is sent to the DHCP server. Correspondingly, the processing unit 502 is configured to acquire the route of the DHCP server corresponding to the communication device when the packet is determined to be a DHCP message sent by the broadcast mode. The address, the broadcast address of the destination address field of the DHCP message is replaced with the routing address of the DHCP server, and the processing unit 502 is configured to obtain the routing address of the DHCP server from the routing indication information, and And replacing the broadcast address of the destination address field of the DHCP message with the routing address of the DHCP server according to the routing indication in the routing indication information.

The switch may further include an access unit, configured to send an identifier of the communication device to the controller after the communication device accesses the switch; the routing indication information further includes an identifier of the communication device Mapping relationship of a routing address of the DHCP server, where the routing instruction is specific For instructing the switch to route the DHCP message sent by the communication device to the DHCP server; correspondingly, the processing unit 502 is configured to obtain a routing address of the DHCP server corresponding to the communication device, Specifically, the processing unit 502 is configured to obtain the identifier of the communications device from the DHCP packet, and obtain a routing address of the DHCP server corresponding to the identifier of the communications device according to the mapping relationship in the routing indication information. . According to Embodiment 1 of the present invention, Embodiment 4 of the present invention proposes a controller 600. As shown in FIG. 8, the controller 600 includes: a generating unit 601 and a transmitting unit 602. The generating unit 601 is configured to generate routing indication information, where the routing indication information includes a routing address of the DHCP server, and a routing instruction for instructing the switch to route the received DHCP message sent by the switch to the DHCP server, and use the route indication The routing indication information is sent to the sending unit 602. The routing address of the DHCP server may specifically include an IP address and a MAC address of the DHCP server.

The sending unit 602 is configured to receive the routing indication information from the generating unit 601, and is further configured to send the routing indication information to a switch that communicates with the controller, so that the switch receives the DHCP sent by the broadcast mode. And sending, by the DHCP server, the DHCP message to the DHCP server according to the routing address of the DHCP server in the routing indication information. The controller may further include a receiving unit, configured to receive an identifier of the communications device that is sent by the switch when the communications device accesses the switch, and configured to send the identifier of the communications device to the determining a generating unit 601, configured to receive an identifier of the communications device from the receiving unit, and determine a DHCP server corresponding to the communications device; and correspondingly, the routing indication information generated by the generating unit 601 further includes communications The mapping between the identifier of the device and the routing address of the DHCP server, where the routing indication is specifically used to instruct the switch to route the DHCP message sent by the communication device to the DHCP server, When the switch receives the DHCP message including the identifier of the communication device, the switch obtains the routing address of the DHCP server according to the mapping relationship and according to the route of the DHCP server. The address routes the DHCP message to the DHCP server. According to Embodiment 2 of the present invention, Embodiment 5 of the present invention proposes a switch 700. As shown in FIG. 9, the switch 700 includes: a receiving unit 701 and a forwarding unit 702. The receiving unit 701 is configured to receive a packet sent by the communication device that accesses the switch, and send the packet to the forwarding unit 702.

The forwarding unit 702 is configured to receive the packet from the receiving unit 701, and determine that the packet is

The DHCP message is forwarded to the controller in communication with the switch, so that the controller provides a DHCP service for the communication device according to the DHCP message. The receiving unit 701 is further configured to receive the indication information that is sent by the controller, where the indication information is used to instruct the switch to forward the received DHCP message to the controller. Correspondingly, the forwarding unit 702 is specifically configured to The indication information performs an operation of forwarding the DHCP message to the controller when determining that the message is a DHCP message.

The switch may further include an access unit, configured to send a port number of the port to the controller when the communication device accesses the switch through a port on the switch; and the receiving unit 701 further uses And receiving the data packet that is sent by the controller and carrying the DHCP packet and the port number, and sending the data packet to the forwarding unit 702. Correspondingly, the forwarding unit 702 is further configured to receive from the receiving unit 701. Sending, by the data packet, the DHCP message carried by the data packet to the communication device by using the port identified by the port number in the data packet. According to Embodiment 2 of the present invention, Embodiment 6 of the present invention proposes a controller 800. As shown in FIG. 10, the controller 800 includes: a transmitting unit 801, a receiving unit 802, and a service unit 803. The sending unit 801 is configured to send, to the switch that communicates with the controller, the indication information, where the indication information is used to instruct the switch to forward the received DHCP message to the controller;

The receiving unit 802 is configured to receive, by the switch, the DHCP message forwarded to the controller when the packet received by the communication device that accesses the switch is a DHCP message according to the indication information, and is used by the switch Sending the DHCP message to the service unit 803;

a service unit 803, configured to receive the DHCP message from the receiving unit 802, and used to The DHCP message provides a DHCP service for the communication device.

The receiving unit 802 is further configured to receive, by the switch, a port number of the port that is sent when the communications device accesses the switch through a port on the switch, and send the port number to the service unit. 803; Correspondingly, the service unit 803 is further configured to receive the port number from the receiving unit 802. The service unit 803 is configured to provide the DHCP service to the communication device according to the DHCP message, and the method includes: the service unit 803 is configured to construct a DHCP message including data corresponding to the DHCP service, and the configured DHCP message and the The port number is encapsulated into the data packet, and is used to send the data packet to the sending unit 801. The sending unit 801 is further configured to receive the data packet from the service unit 803, and send the data packet to the switch, so that the switch identifies by using a port number in the data packet. The port sends the DHCP packet carried by the data packet to the communication device. According to Embodiment 1 of the present invention, Embodiment 7 of the present invention provides a switch 1000. As shown in FIG. 11, the switch 1000 includes a processor 1010 and a memory 1020, wherein the communication between the processor 1010 and the memory 1020 is completed by a bus.

The memory 1020 is configured to store computer operation instructions. The memory 1020 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.

The processor 1010 is configured to execute computer operation instructions stored in the memory 1020. The processor 1010 may specifically be a central processing unit (CPU) and is a computer core unit.

The processor 1010 executes the computer operation instruction, so that the switch 1000 performs the following operations: receiving a message sent by the communication device of the access switch 1000;

Obtaining a routing address of the DHCP server corresponding to the communication device when the packet is a DHCP message sent by the broadcast, and setting a broadcast address of the destination address field of the DHCP message And being replaced by the routing address of the DHCP server, where the DHCP packet may be a DHCP discovery packet or a DHCP request message;

The modified DHCP packet is routed to the DHCP server according to the routing address in the modified DHCP packet. The routing address of the DHCP server may include the IP address and the MAC address of the DHCP server. Correspondingly, the broadcast address of the destination address field of the DHCP message is replaced with the routing address of the DHCP server. The method may include: replacing the broadcast IP address of the destination IP address field of the DHCP message with the IP address of the DHCP server, and replacing the broadcast MAC address of the destination MAC address field of the DHCP message with the DHCP The MAC address of the server.

The processor 1010 executing the computer operation instructions may further cause the switch 1000 to perform the following operations: receiving routing indication information sent by a controller in communication with the switch 1000, the routing indication information including a routing address of the DHCP server, and Instructing the switch 1000 to route the received broadcasted DHCP message to the routing indication of the DHCP server. Correspondingly, the obtaining the routing address of the DHCP server corresponding to the communication device, and replacing the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server, specifically includes: Obtaining, by the information, the routing address of the DHCP server, and replacing the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server according to the routing indication in the routing indication information.

Executing the computer operating instructions by the processor 1010 may further cause the switch 1000 to perform the following operations: transmitting an identification of the communication device to the controller after the communication device accesses the switch 1000. Correspondingly, the routing indication information further includes a mapping relationship between the identifier of the communication device and a routing address of the DHCP server; the routing indication is specifically used to indicate that the switch 1000 will receive the broadcast device from the communication device. The DHCP message is routed to the DHCP server. The obtaining the routing address of the DHCP server corresponding to the communication device includes: obtaining the identifier of the communication device from the DHCP packet, and according to the routing indication information The mapping relationship in the obtaining the routing address of the DHCP server corresponding to the identifier of the communication device. According to Embodiment 1 of the present invention, Embodiment 8 of the present invention provides a controller 2000. As shown in FIG. 12, the controller 2000 includes a processor (proces sor) 2010 and a memory 2020, wherein the communication between the processor 2010 and the memory 2020 is completed by a bus.

The memory 2020 is configured to store computer operation instructions. Memory 2020 may include high speed RAM memory and may also include non-volatile memory, such as at least one disk memory.

The processor 2010 is configured to execute computer operation instructions stored in the memory 2020. The processor 2010 may specifically be a central processing unit (CPU, cent ra l proces s ing uni t ) and is a computer core unit. The processor 2010 executes the computer operation instruction, so that the controller 2000 performs the following operations: generating routing indication information, where the routing indication information includes a routing address of the DHCP server, and a DHCP for indicating that the switch will receive the broadcast. And routing the message to the DHCP server, the routing address of the DHCP server may include an IP address and a MAC address of the DHCP server; and sending the routing indication information to a switch that communicates with the controller 2000, so that When receiving the DHCP message sent by the broadcast, the switch routes the DHCP message to the DHCP server according to the routing address of the DHCP server in the routing indication information.

The processor 2010 executing the computer operation instructions may further cause the controller 2000 to perform the following operations: receiving an identifier of the communication device sent by the switch when the communication device accesses the switch, and determining the communication device The corresponding DHCP server. Correspondingly, the routing indication information further includes a mapping relationship between the identifier of the communication device and the routing address of the DHCP server, where the routing indication is specifically used to indicate that the switch will receive the broadcast mode from the communication device. The DHCP message is routed to the DHCP server, so that: the switch acquires the DHCP server according to the mapping relationship when receiving the DHCP message that is sent by the communication device and includes the identifier of the communication device. Routing address and routing the DHCP message to the DHCP server according to the routing address of the DHCP server. According to Embodiment 2 of the present invention, Embodiment 9 of the present invention provides a switch 3000. As shown in FIG. 13, the switch 3000 includes a processor (proces sor) 3010 and a memory 3020, wherein the communication between the processor 3010 and the memory 3020 is completed by a bus.

The memory 3020 is configured to store computer operation instructions. The memory 3020 may include a high speed RAM memory and may also include a non-volatile memory, such as at least one disk memory.

The processor 3010 is configured to execute computer operation instructions stored in the memory 3020. The processor 3010 may specifically be a central processing unit (CPU, cent ra l proces s ing uni t ) and is a computer core unit.

The processor 3010 executes the computer operation instruction, so that the switch 3000 performs the following operations: receiving a message sent by the communication device of the access switch 3000; and forwarding the DHCP message to the DHCP message when determining that the message is a DHCP message A controller in communication with the switch 3000 to cause the controller to provide a DHCP service to the communication device according to the DHCP message. The executing the computer operation instruction by the processor 3010 may further enable the switch 3000 to perform the following operations: receiving the indication information sent by the controller, where the indication information is used to instruct the switch 3000 to forward the received DHCP message to the controller . Correspondingly, the processor 3010 executes the computer operation instruction to cause the switch 3000 to perform an operation of forwarding the DHCP message to the controller when determining that the message is a DHCP message according to the indication information.

The processor 3010 executing the computer operation instructions may further cause the switch 3000 to perform the following operations: when the communication device accesses the switch 3000 through a port on the switch 3000, send the port number of the port to the controller; And sending, by the controller, the DHCP packet carrying the DHCP packet and the port number to the DHCP message carried by the data packet by using the port identified by the port number in the data packet Said communication device. According to Embodiment 2 of the present invention, Embodiment 10 of the present invention provides a controller 4000. Figure 14 As shown, the controller 4000 includes a processor 4010 and a memory 4020, wherein communication between the processor 4010 and the memory 4020 is accomplished by a bus.

The memory 4020 is configured to store computer operation instructions. The memory 4020 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.

The processor 4010 is configured to execute computer operation instructions stored in the memory 4020. The processor 4010 may specifically be a central processing unit (CPU, cent ra l proces s ing uni t ) and is a computer core unit. The processor 4010 executes the computer operation instruction, so that the controller 4000 performs the following operations: sending indication information to the switch that communicates with the controller 4000, the indication information is used to instruct the switch to forward the received DHCP message to the control. And receiving, by the switch, the DHCP message forwarded to the controller 4000 when the packet received by the communication device that accesses the switch is a DHCP message according to the indication information; and the DHCP message according to the DHCP message A DHCP service is provided for the communication device.

The processor 4010 executing the computer operation instructions may further cause the controller 4000 to perform the following operations: receiving a port number of the port sent by the switch when the communication device accesses the switch through a port on the switch The providing the DHCP service to the communication device according to the DHCP message specifically includes: constructing a DHCP message including data corresponding to the DHCP service, and encapsulating the constructed DHCP message and the port number into the datagram The message is sent to the switch, so that the switch sends the DHCP message carried by the data packet to the communication device by using the port identified by the port number in the data packet. According to Embodiment 1 of the present invention, Embodiment 11 of the present invention proposes a communication system 5000. As shown in FIG. 15, the communication system 5000 includes a controller 5010 and a switch 5020, wherein the controller 5010 communicates with the switch 5020 through a network. The controller 5010 is configured to generate routing indication information, where the routing indication information includes a DHCP service. And the route indication of the router, and the route indication that is sent to the DHCP server by the switch to be sent by the switch to the switch 5020;

The switch 5020 is configured to receive the packet sent by the communication device of the access switch 5020, and obtain the routing address of the DHCP server from the routing indication information when determining that the packet is a DHCP message sent by the broadcast mode. And replacing, according to the routing indication in the routing indication information, the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server, and also according to the routing address in the modified DHCP packet. The modified DHCP message is routed to the DHCP server.

The routing address of the DHCP server may include the IP address and the MAC address of the DHCP server. Correspondingly, the switch 5020 is configured to replace the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server. Specifically, the switch 5020 is configured to replace the broadcast IP address of the destination IP address field of the DHCP message with the IP address of the DHCP server, and broadcast the MAC address of the destination MAC address field of the DHCP message. The address is replaced with the MAC address of the DHCP server.

The switch 5020 can also be used to connect the controller to the switch 5020 after the communication device is connected.

The controller 5010 is further configured to determine a DHCP server corresponding to the communication device, where the routing indication information generated by the controller 5010 further includes an identifier of the communication device and the DHCP server. a route mapping relationship, where the route indication is specifically used to instruct the switch 5020 to route the DHCP message sent by the communication device to the DHCP server; correspondingly, the switch 5020 is configured to acquire the communication. The routing address of the DHCP server corresponding to the device specifically includes: the switch 5020 is configured to obtain the identifier of the communication device from the DHCP packet, and obtain the identifier corresponding to the communication device according to the mapping relationship in the routing indication information. The routing address of the DHCP server.

The communication system described in Embodiment 11 of the present invention can be used to implement the method described in Embodiment 1 above. According to Embodiment 2 of the present invention, Embodiment 12 of the present invention provides a communication system 6000. As shown in FIG. 16, the communication system 6000 includes a controller 6010 and a switch 6020, wherein the controller 6010 and the switch 6020 communicate through a network. The controller 6010 is configured to send the indication information to the switch 6020, where the indication information is used to instruct the switch 6020 to forward the received DHCP message to the controller 6010;

The switch 6020 is configured to forward the DHCP message to the controller 6010 when determining that the message is a DHCP message according to the indication information;

The controller 6010 is further configured to provide a DHCP service for the communication device according to the DHCP message. Further, the switch 6020 may be further configured to: when the communication device accesses the switch 6020 through the port on the switch 6020, send the port number of the port to the controller 6010; the controller 6010 is configured according to the DHCP message. The communication device provides the DHCP service, and the controller 6010 constructs a DHCP message including the data corresponding to the DHCP service, and encapsulates the constructed DHCP message and the port number into the data packet and sends the message to the switch 6020. 6020. The method further sends the DHCP message carried by the data packet to the communication device by using a port identified by the port number in the data packet.

The communication system described in Embodiment 12 of the present invention can be used to implement the method described in Embodiment 2 above.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in a combination of electronic hardware or computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

It will be apparent to those skilled in the art that, for the convenience of the description and the cleaning process, the specific operation of the system, the device and the unit described above may be referred to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and The method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form. The components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, Random Acces s Memory), a magnetic disk, or an optical disk, and the like, which can store program codes. medium.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A method for dynamically allocating an IP address, the method comprising:

Receiving, by the switch, a packet sent by a communication device that accesses the switch;

The switch routes the modified DHCP message to the DHCP server according to the routing address in the modified DHCP message.

2. The method of claim 1 wherein:

The routing address of the DHCP server includes the IP address and the MAC address of the DHCP server. The switch replaces the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server, and the specific information includes: The switch replaces the broadcast IP address of the destination IP address field of the DHCP message with the IP address of the DHCP server, and replaces the broadcast MAC address of the destination MAC address field of the DHCP message with the MAC address of the DHCP server. address.

3. The method of claim 1 or 2, wherein

Before the switch obtains the routing address of the DHCP server, the switch further includes: the switch receives routing indication information sent by a controller that communicates with the switch, where the routing indication information includes a routing address of the DHCP server, and is used for Instructing the switch to route the received broadcast message sent by the broadcast to the DHCP server;

And the obtaining the routing address of the DHCP server corresponding to the communication device, and replacing the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server, specifically: acquiring the routing indication information And the routing address of the DHCP server, and replacing the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server according to the routing indication in the routing indication information.

The method according to claim 3, wherein before the switch receives the routing indication information sent by the controller in communication with the switch, the method further includes: after the switch accesses the switch, the switch Sending an identifier of the communication device to the controller; The routing indication information further includes a mapping relationship between the identifier of the communication device and a routing address of the DHCP server; the routing indication is specifically used to indicate that the switch receives the DHCP sent by the communication device in a broadcast manner. The message is routed to the DHCP server;

The obtaining the routing address of the DHCP server corresponding to the communication device includes: acquiring the identifier of the communication device from the DHCP packet, and acquiring the identifier of the communication device according to the mapping relationship in the routing indication information Corresponding routing address of the DHCP server.

The method according to any one of claims 1-4, wherein the DHCP message is specifically a DHCP discovery message or a DHCP request message.

A method for dynamically allocating an IP address, the method comprising:

The controller generates routing indication information, where the routing indication information includes a routing address of the DHCP server, and a routing indication for instructing the switch to route the received DHCP message sent by the switch to the DHCP server.

The controller sends the routing indication information to a switch that communicates with the controller, so that when the switch receives the DHCP message sent by the broadcast, according to the routing indication information,

The method of claim 6, wherein before the controller generates the routing indication information, the method further comprises: receiving, by the controller, the switch that is sent by the switch when the communication device accesses the switch An identifier of the communication device, and determining a DHCP server corresponding to the communication device;

The route indication information further includes a mapping relationship between the identifier of the communication device and the routing address of the DHCP server, where the route indication is specifically used to indicate that the switch receives the DHCP message sent by the communication device in a broadcast manner. Routing to the DHCP server, so that: the switch acquires the routing address of the DHCP server according to the mapping relationship when receiving the DHCP message that is sent by the communications device and includes the identifier of the communications device And routing the DHCP packet to the DHCP server according to the routing address of the DHCP server.

The method according to claim 6 or 7, wherein the routing address of the DHCP server comprises an IP address and a MAC address of the DHCP server.

A method for dynamically allocating an IP address, the method comprising: the switch receiving a packet sent by a communication device accessing the switch;

When the switch determines that the packet is a DHCP message, the switch forwards the DHCP message to a controller that communicates with the switch, so that the controller provides DHCP for the communication device according to the DHCP message. service.

10. The method of claim 9 wherein:

Before the switch forwards the DHCP message to the controller, the switch further includes: the switch receiving the indication information sent by the controller, where the indication information is used to instruct the switch to forward the received DHCP message to the The controller;

The switch performs an operation of forwarding the DHCP message to the controller when determining that the packet is a DHCP message according to the indication information.

The method according to claim 9 or 10, wherein the method further comprises: when the communication device accesses the switch through a port on the switch, the switch is to the controller Send the port number of the port;

When the switch receives the data packet carrying the DHCP packet and the port number, the switch sends the DHCP packet carried by the data packet through the port identified by the port number in the data packet. The text is sent to the communication device.

A method for dynamically allocating an IP address, the method comprising:

The controller sends the indication information to the switch that communicates with the controller, where the indication information is used to indicate that the switch forwards the received DHCP message to the controller;

The controller receives the DHCP message forwarded by the switch to the controller when determining that the packet received by the communication device accessing the switch is a DHCP message according to the indication information;

The controller provides a DHCP service for the communication device according to the DHCP message.

The method according to claim 12, wherein the method further comprises: The controller receives a port number of the port that is sent by the switch when the communication device accesses the switch through a port on the switch;

The controller provides the DHCP service to the communication device according to the DHCP message, and the controller includes: constructing a DHCP message including data corresponding to the DHCP service, and configuring the configured DHCP message and the port The number is encapsulated into the data packet and sent to the switch, so that the switch sends the DHCP packet carried by the data packet to the communication device by using the port identified by the port number in the data packet.

A switch, comprising: a receiving unit, a processing unit, and a routing unit;

15. The switch of claim 14 wherein:

The routing address of the DHCP server includes an IP address and a MAC address of the DHCP server;

The routing address of the DHCP server specifically includes: the processing unit is configured to replace the broadcast IP address of the destination IP address field of the DHCP message with the IP address of the DHCP server, and set the destination MAC address of the DHCP message The broadcast MAC address of the address field is replaced with the MAC address of the DHCP server.

16. The switch of claim 14 or 15, wherein

The receiving unit is further configured to receive a routing indication message sent by a controller that communicates with the switch The routing indication information includes a routing address of the DHCP server, and a routing indication for instructing the switch to route the received DHCP message to the DHCP server; the processing unit is configured to: And obtaining a routing address of the DHCP server corresponding to the communication device, and replacing the broadcast address of the destination address field of the DHCP packet with the route of the DHCP server, when determining that the packet is a DHCP message sent by the broadcast mode. And the processing unit is configured to: obtain the routing address of the DHCP server from the routing indication information, and broadcast the destination address field of the DHCP packet according to the routing indication in the routing indication information. The address is replaced with the routing address of the DHCP server.

The switch according to claim 16, wherein the switch further comprises an access unit;

The access unit is configured to send, after the communication device accesses the switch, an identifier of the communication device to the controller;

The routing indication information further includes a mapping relationship between the identifier of the communication device and a routing address of the DHCP server, where the routing indication is specifically used to indicate that the switch receives the DHCP sent by the communication device in a broadcast manner. The message is routed to the DHCP server;

The processing unit is configured to obtain a routing address of the DHCP server corresponding to the communication device, and the method includes: the processing unit is configured to acquire an identifier of the communication device from the DHCP packet, and according to the routing indication information The mapping relationship in the obtaining the routing address of the DHCP server corresponding to the identifier of the communication device.

A controller, comprising: a generating unit and a sending unit; the generating unit, configured to generate routing indication information, where the routing indication information includes a routing address of a DHCP server, and is used for indicating The switch routes the received DHCP message sent by the broadcast to the routing instruction of the DHCP server, and sends the route indication information to the sending unit.

The sending unit is configured to receive the routing indication information from the generating unit, and is further configured to send the routing indication information to a switch that communicates with the controller, so that the switch receives the When the DHCP message is sent in the broadcast mode, the DHCP message is routed to the DHCP server according to the routing address of the DHCP server in the routing indication information.

19. The controller of claim 18, wherein the controller further comprises a receiving unit;

The receiving unit is configured to receive an identifier of the communications device that is sent by the switch when the communications device accesses the switch, and is configured to send the identifier of the communications device to the determining unit; The unit is further configured to receive an identifier of the communication device from the receiving unit, and determine a DHCP server corresponding to the communication device;

The routing indication information generated by the generating unit further includes a mapping relationship between the identifier of the communication device and the routing address of the DHCP server, where the routing indication is specifically used to indicate that the switch will receive the broadcast from the communication device. The DHCP message sent by the method is routed to the DHCP server, so that: the switch acquires the DHCP message according to the mapping relationship when receiving the DHCP message that is sent by the communication device and includes the identifier of the communication device. Decoding the routing address of the DHCP server and routing the DHCP packet to the DHCP server according to the routing address of the DHCP server.

The controller according to claim 18 or 19, wherein the routing address of the DHCP server comprises an IP address and a MAC address of the DHCP server.

A switch, comprising: a receiving unit and a forwarding unit; the receiving unit, configured to receive a packet sent by a communication device that accesses the switch, and send the packet to the switch Forwarding unit

22. The switch of claim 21, wherein

The receiving unit is further configured to receive the indication information sent by the controller, where the indication information is used to instruct the switch to forward the received DHCP message to the controller;

The forwarding unit is specifically configured to perform, according to the indication information, that the packet is a DHCP packet. The DHCP message is forwarded to the operation of the controller.

The switch according to claim 21 or 11, wherein the switch further comprises an access unit;

The access unit is configured to send, when the communication device accesses the switch through a port on the switch, a port number of the port to the controller;

The receiving unit is further configured to receive a data packet that is sent by the controller and that carries the DHCP packet and the port number, and send the data packet to the forwarding unit.

The forwarding unit is further configured to: receive, by the receiving unit, the data packet, and send, by the port identified by the port number in the data packet, the DHCP packet carried by the data packet to the communication device.

A controller, comprising: a transmitting unit, a receiving unit, and a service unit;

The sending unit is configured to send indication information to a switch that is in communication with the controller, where the indication information is used to instruct the switch to forward the received DHCP message to the controller;

25. The controller of claim 24, wherein

The receiving unit is further configured to receive a port number of the port that is sent by the switch when the communication device accesses the switch through a port on the switch, and send the port number to the Service unit

The service unit is further configured to receive the port number from the receiving unit;

The service unit is configured to provide the DHCP service to the communication device according to the DHCP message, the method further includes: the service unit is configured to construct a DHCP message including data corresponding to the DHCP service, where The configured DHCP packet and the port number are encapsulated into the data packet, and are used to send the data packet to the sending unit.

The sending unit is further configured to receive the data packet from the service unit, and send the data packet to the switch, so that the switch passes the port number in the data packet. The identified port sends the DHCP message carried in the data packet to the communication device.

26. A communication system, the communication system comprising a switch and a controller, the switch and the controller communicating over a network;

The controller is configured to generate routing indication information, where the routing indication information includes a routing address of the DHCP server, and a routing indication for instructing the switch to route the received DHCP message sent by the switch to the DHCP server. The method is further configured to send the routing indication information to the switch, where the switch is configured to receive a packet sent by a communication device that accesses the switch, and when determining that the packet is a DHCP message sent by using a broadcast mode, And obtaining the routing address of the DHCP server from the routing indication information, and replacing the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server according to the routing indication in the routing indication information And the method is further configured to route the modified DHCP message to the DHCP server according to the routing address in the modified DHCP message.

The communication system according to claim 26, wherein the routing address of the DHCP server includes an IP address and a MAC address of the DHCP server;

The switch is configured to replace the broadcast address of the destination address field of the DHCP packet with the routing address of the DHCP server, and specifically includes: the switch is configured to broadcast the IP address of the destination IP address field of the DHCP packet. The address is replaced with the IP address of the DHCP server, and the broadcast MAC address of the destination MAC address field of the DHCP message is replaced with the MAC address of the DHCP server.

28. The communication system of claim 26 or 27, wherein

The switch is further configured to send an identifier of the communication device to the controller after the communication device accesses the switch;

The controller is further configured to determine a DHCP server corresponding to the communication device, where the routing indication information generated by the controller further includes an identifier of the communication device and a routing address of the DHCP server. The mapping relationship is specifically used to instruct the switch to route the DHCP message sent by the communication device to the DHCP server;

The obtaining, by the switch, the routing address of the DHCP server corresponding to the communication device, the switch is configured to obtain the identifier of the communication device from the DHCP packet, and according to the mapping in the routing indication information The relationship acquires a routing address of the DHCP server corresponding to the identifier of the communication device.

29. A communication system, the communication system comprising a switch and a controller, the switch and the controller communicating over a network;

The controller is further configured to provide a DHCP service for the communication device according to the DHCP message.

30. The communication system of claim 29, wherein

The switch is further configured to: when the communication device accesses the switch through a port on the switch, send a port number of the port to the controller;

The controller provides the DHCP service to the communication device according to the DHCP message, and the controller includes: constructing a DHCP message including data corresponding to the DHCP service, and configuring the configured DHCP message and the port The number is encapsulated into a data packet and sent to the switch;

The switch is further configured to send, by the port identified by the port number in the data packet, the DHCP message carried by the data packet to the communication device.