WO2014205700A1 - 一种ip地址分配的系统和方法 - Google Patents

一种ip地址分配的系统和方法 Download PDF

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Publication number
WO2014205700A1
WO2014205700A1 PCT/CN2013/078068 CN2013078068W WO2014205700A1 WO 2014205700 A1 WO2014205700 A1 WO 2014205700A1 CN 2013078068 W CN2013078068 W CN 2013078068W WO 2014205700 A1 WO2014205700 A1 WO 2014205700A1
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WO
WIPO (PCT)
Prior art keywords
address
dhcp
control device
forwarding device
forwarding
Prior art date
Application number
PCT/CN2013/078068
Other languages
English (en)
French (fr)
Inventor
周伟
陈中平
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201910350360.7A priority Critical patent/CN110062060B/zh
Priority to EP19189266.0A priority patent/EP3661167B1/en
Priority to PT138877576T priority patent/PT3002931T/pt
Priority to PCT/CN2013/078068 priority patent/WO2014205700A1/zh
Priority to PT191892660T priority patent/PT3661167T/pt
Priority to EP13887757.6A priority patent/EP3002931B1/en
Priority to CN201380000526.3A priority patent/CN105264869B/zh
Publication of WO2014205700A1 publication Critical patent/WO2014205700A1/zh
Priority to US14/979,380 priority patent/US10574626B2/en
Priority to US16/798,200 priority patent/US10873562B2/en
Priority to US17/126,805 priority patent/US11757832B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/50Address allocation
    • H04L61/5007Internet protocol [IP] addresses
    • H04L61/5014Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/59Network arrangements, protocols or services for addressing or naming using proxies for addressing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/54Organization of routing tables

Definitions

  • the present invention relates to the field of communications, and in particular, to a system and method for IP address allocation.
  • the network switching model protocol OpenFlow implements the separation of the control plane and the forwarding plane as an exchange standard in the SDN network.
  • the SDN network The main components include: a forwarding device supporting OpenFlow and a control device for managing the switching device, wherein the forwarding behavior of the forwarding device is determined by the control device.
  • the forwarding device cannot respond to the request after receiving the dynamic host configuration protocol (DHCP) request sent by the user side. Get the address.
  • DHCP dynamic host configuration protocol
  • An embodiment of the present invention provides a system and method for IP address allocation, which implements a function of obtaining an IP address by a DHCP method when a control device is separated from a forwarding device, and is compared with the prior art.
  • the technical solution adopted by the embodiment of the present invention is
  • the embodiment of the present invention provides a forwarding device, which is applied to a system in which a control plane is separated from a forwarding plane, and includes:
  • a communication unit configured to communicate with an external network element
  • Processor for: Receiving, by the communication unit, an address request sent by an external network element, where the address request includes a DHCP request of a User Equipment (UE) and user feature information of the UE;
  • UE User Equipment
  • the communication unit Obtaining, by the communication unit, the first indication information that is sent by the control device according to the user feature information of the UE and the IP address allocated to the UE, where the first indication information is used to indicate that when the destination address is received, Sending the packet to the UE according to the user characteristic information when the packet of the IP address is received;
  • the processor is configured to acquire, according to the DHCP request, an IP address that is allocated to the UE by using a DHCP service network element, specifically:
  • the processor is configured to send the DHCP request to the DHCP service network element by using the communication unit, and receive, by the communication unit, a DHCP request response sent by the DHCP service network element, where the DHCP request response includes The IP address assigned by the UE, the destination address of the DHCP request response is the IP address allocated for the UE, and the processor is configured to send the IP address to the UE by using the communication unit according to the user feature information. Specifically, including:
  • the processor is configured to send, by using the communications unit, the DHCP request response to the UE according to the first indication information.
  • the processor is configured to acquire, according to the DHCP request, an IP address allocated to the UE by using a DHCP service network element,
  • the communication unit acquires the first indication information that is sent by the control device according to the user feature information of the UE and the IP address allocated to the UE, and specifically includes:
  • the processor is configured to Sending, by the communication unit, the DHCP request and user feature information of the UE to the control device, where the control device integrates a DHCP service;
  • the processor is configured to acquire, according to the DHCP request, an IP address allocated to the UE to the DHCP service network element, specifically including :
  • the processor is configured to:
  • the processor is configured to obtain, according to the user feature information of the UE, the first indication information that is sent by the UE, and the first indication information that is sent by the UE, specifically:
  • the processor is configured to send, by using the communication unit, an IP address allocated to the UE and user feature information of the UE to the control device, and receive, by the communication unit, the control device according to the The first indication information delivered by the IP address and the user feature information of the UE.
  • the processor is further configured to:
  • the processor is configured to send, by using the communications unit, the DHCP request to the DHCP server, specifically:
  • the processor is configured to send, according to the second indication information, the acquiring the DHCP request to the DHCP server by using the communication unit.
  • an embodiment of the present invention provides a control device, which is applied to a system for separating a control plane from a forwarding plane, and includes: a communication unit, configured to communicate with an external network element;
  • a processor configured to: obtain user characteristic information of the user equipment UE, and an IP address allocated to the UE; send, by the communications unit, first indication information to the forwarding device, where the first indication information is used to indicate the forwarding
  • the device sends the packet to the UE according to the user characteristic information, where the forwarding device is controlled by the control device.
  • the processor is configured to acquire user feature information of the UE and an IP address that is allocated to the UE, where the processor is specifically configured to:
  • the processor is configured to acquire user feature information of the UE and an IP address allocated to the UE, where the method includes: the processor is configured to receive by using the communications unit The IP address assigned by the forwarding device and the user feature information of the UE, and the user is sent by the communication unit according to the IP address allocated to the UE and the user feature information of the UE.
  • the first indication information is sent to the forwarding device.
  • the processor is further configured to:
  • the communication unit Transmitting, by the communication unit, the second indication information to the forwarding device, where the second indication information is used to indicate that the forwarding device forwards when receiving the DHCP request
  • the DHCP request is to the DHCP server.
  • an embodiment of the present invention provides an address allocation method, which is applied to a system for separating a control plane from a forwarding plane, and includes:
  • the forwarding device receives the address request sent by the external network element, where the address request includes the DHCP request of the user equipment UE and the user characteristic information of the UE; the forwarding device acquires the DHCP service network element according to the DHCP request.
  • the forwarding device obtains, by the DHCP service network element, an IP address that is allocated to the UE according to the DHCP request, and specifically includes:
  • the forwarding device sends the DHCP request to the DHCP service network element, and receives a DHCP request response sent by the DHCP service network element, where the DHCP request response includes an IP address allocated to the UE, and the DHCP
  • the destination address of the request response is the IP address assigned to the UE, and the forwarding device sends the IP address to the UE according to the user feature information, which specifically includes: the forwarding device according to the first indication information, Sending the DHCP request response to the UE.
  • the forwarding device acquires, according to the DHCP request, an IP address allocated to the UE to the DHCP service network element; The first indication sent by the device acquisition control device according to the user characteristic information of the UE and the IP address allocated to the UE Specifically, the forwarding device sends the DHCP request and the user feature information of the UE to the control device, where the control device integrates a DHCP service, and the forwarding device receives the The IP address assigned by the UE and the first indication information.
  • the forwarding device acquires, by the DHCP service network element, an IP address that is allocated to the UE according to the DHCP request, and specifically includes: The forwarding device sends the DHCP request to a DHCP server;
  • the forwarding device receives an IP address that is allocated by the DHCP server to the UE, and the forwarding device acquires first indication information that is sent by the control device according to the user feature information of the UE and an IP address allocated to the UE. Specifically, the forwarding device sends an IP address allocated to the UE and user feature information of the UE to the control device, and receives an IP address allocated by the control device according to the UE and the UE. The first indication information delivered by the user feature information.
  • the sending, by the forwarding device, the DHCP request to the DHCP server specifically: the forwarding device sends the DHCP request to the control device;
  • the forwarding device receives the second indication information that is sent by the control device, where the second indication information is used to indicate that when the DHCP request is received, the DHCP request is forwarded to the DHCP server;
  • the sending, by the DHCP server, the DHCP request includes:
  • the forwarding device sends the DHCP request to the DHCP server by using the communication unit according to the second indication information.
  • an embodiment of the present invention provides an address allocation method, which is applied to a system for separating a control plane from a forwarding plane, and includes:
  • the control device acquires user feature information of the user equipment UE and is allocated to the UE
  • the control device sends the first indication information to the forwarding device, where the first indication information is used to indicate that the forwarding device receives the packet with the destination address being the IP address, according to the user characteristic information. And sending the packet to the UE, where the forwarding device is controlled by the control device.
  • control device obtains the user feature information of the user equipment UE and the IP address allocated to the UE, and specifically includes:
  • the control device Receiving, by the control device, the DHCP request of the UE and the user feature information of the UE, where the control device integrates a DHCP service; the control device allocates an IP address to the UE;
  • control device sends the IP address and the first indication information allocated to the UE to the forwarding device according to the user feature information of the UE and the IP address allocated to the UE.
  • control device obtains the user feature information of the user equipment UE and the IP address allocated to the UE, which specifically includes:
  • the control device receives the IP address allocated by the forwarding device for the UE and the user feature information of the UE, and delivers the information according to the IP address allocated to the UE and the user feature information of the UE.
  • the first indication information is sent to the forwarding device.
  • control device receives the IP address and the user characteristic information that are sent by the forwarding device, and specifically includes:
  • the control device receives the DHCP request of the UE sent by the forwarding device; the control device sends the second indication information to the forwarding device, where the second indication information is used to indicate that the forwarding device receives the When the DHCP request is described, the DHCP request is forwarded to the DHCP server.
  • a fifth aspect provides a forwarding device, which is applied to a system for separating a control plane from a forwarding plane, and includes:
  • a receiving unit configured to receive an address request sent by an external network element, where the address request includes a DHCP request of the user equipment UE and user feature information of the UE, and an acquiring unit, configured to send a DHCP request to the DHCP service network according to the DHCP request And acquiring, by the UE, an IP address that is allocated to the UE, where the acquiring unit is further configured to: acquire, by the control device, first indication information that is sent by the user, according to the user feature information of the UE, and an IP address that is allocated to the UE, where An indication information is used to indicate that when the packet whose destination address is the IP address is received, the packet is sent to the UE according to the feature information of the user, and the sending unit is configured to send according to the feature information of the user. Said IP address to said
  • the acquiring unit is specifically configured to: send the DHCP request to the DHCP service network element, and receive a DHCP request response sent by the DHCP service network element,
  • the DHCP request response includes an IP address allocated to the UE, and the destination address of the DHCP request response is the IP address allocated for the UE.
  • the sending unit is specifically configured to: according to the first indication information, Sending the DHCP request response to the UE.
  • the acquiring unit includes: a first sending subunit, configured to send the DHCP request to the control device, and User information of the UE; wherein the control device integrates a DHCP service; the first receiving subunit is configured to receive an IP address and the first indication information that are sent by the control device and are allocated by the control device.
  • the acquiring unit includes:
  • a second sending subunit configured to send the DHCP request to a DHCP server
  • a second receiving subunit configured to receive an IP address allocated by the DHCP server to the UE
  • the second sending subunit is further configured to send an IP address allocated to the UE and user feature information of the UE to the control device, so that the control device is configured according to the IP address and the user feature. Sending the first indication information to the forwarding device by using the information;
  • the second receiving subunit is further configured to receive first indication information that is sent by the control device according to the IP address allocated for the UE and the user feature information of the UE.
  • the sending unit is further configured to: send the DHCP request to the control device; and the receiving unit is further configured to receive the control a second indication information that is sent by the device, where the second indication information is used to indicate that the DHCP request is forwarded to the DHCP server when the DHCP request is received; The second indication information sends the DHCP request to the DHCP server.
  • a control device which is applied to a system for separating a control plane from a forwarding plane, and includes:
  • An acquiring unit configured to acquire user characteristic information of the UE and an IP address allocated to the UE
  • a sending unit configured to send the first indication information to the forwarding device, where the first indication information is used to indicate that the forwarding device receives
  • the packet is sent to the UE according to the user characteristic information, where the forwarding device is controlled by the control device.
  • the acquiring unit further includes:
  • a first receiving subunit configured to receive a DHCP request of the UE and user feature information of the UE, where the forwarding device is integrated, where the control device is integrated DHCP month service;
  • An allocation subunit configured to allocate an IP address to the UE
  • a sending subunit configured to send an IP address and an IP address allocated to the UE according to user characteristic information of the UE and an IP address allocated to the UE An indication message to the forwarding device.
  • the acquiring unit further includes:
  • a second receiving subunit configured to receive an IP address allocated by the forwarding device for the UE and user feature information of the UE, and according to an IP address allocated to the UE and user feature information of the UE And sending the first indication information to the forwarding device.
  • the second receiving sub-unit further includes: a receiving module, configured to receive a DHCP request of the UE sent by the forwarding device;
  • a sending module configured to send the second indication information to the forwarding device, where the second indication information is used to indicate that the forwarding device forwards the DHCP request to the DHCP server when receiving the DHCP request.
  • the seventh aspect of the present invention provides a system for separating a control plane from a forwarding plane, including the forwarding device according to any one of the preceding aspects, and the control device according to any one of the second aspects, or The forwarding device of any of the aspects, wherein the control device of any of the sixth aspects.
  • the embodiment of the invention provides a system and a method for allocating an IP address. When the control device is separated from the forwarding device, the function of obtaining an IP address by using a DHCP method is implemented, and the SDN is solved compared with the prior art.
  • FIG. 1 is a network architecture diagram of SAE/LTE that introduces SDN
  • FIG. 2 is a schematic flowchart of an address allocation method according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of another address allocation method according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a detailed embodiment of an address allocation method.
  • FIG. 5 is a schematic flowchart diagram of another detailed embodiment of an address allocation method.
  • FIG. 6 is a schematic flowchart of a detailed embodiment of another address allocation method.
  • FIG. 7 is a schematic flow chart of another detailed embodiment of another address allocation method;
  • FIG. 8 is a schematic structural diagram of a forwarding device according to an embodiment of the present invention
  • FIG. 9 is a schematic structural diagram of another forwarding device according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a control device according to an embodiment of the present invention
  • 1 is a schematic structural diagram of another control device according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of a device for forwarding device according to an embodiment of the present invention
  • FIG. 13 is a schematic diagram of a control device according to an embodiment of the present invention
  • FIG. 14 is a schematic diagram of a system for assigning an IP address according to an embodiment of the present invention.
  • WCDMA Wideband Code Division Multiple Access
  • CDMA-2000 Code Division-2000 network
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • WiMAX global microwave interconnection Worldwide Interoperability for Microwave Access
  • SAE System Architecture Evolution
  • LTE Long-Term Evolution
  • the SAE/LTE network may include an access network and a core network, where the access network includes a UE and an evolved base station eNodeB, and the eNodeB is configured to provide an air interface to the UE, so that the UE accesses the SAE/LTE network.
  • the device included in the access network does not contribute to the improvement of the technology, so the devices included in the access network are collectively referred to as the user side.
  • the key logical network elements of the core network include a Mobility Management Entity (MME), a Server Gateway (S-GW), and a Packet Data Network Gateway (P-GW).
  • MME Mobility Management Entity
  • S-GW Server Gateway
  • P-GW Packet Data Network Gateway
  • the MME is responsible for the core network control function of the SAE/LTE network, and performs mobility management and session management of the user equipment.
  • the S-GW and the P-GW can be used to provide data transmission services to the user side.
  • the control function of the core network element is separated from the forwarding function.
  • the control plane function of the core network element can configure and manage the forwarding device according to the OpenFlow protocol, and the forwarding device implements the forwarding plane function of the core network element, including
  • the gateway forwarding function of the S-GW and the P-GW can implement processing of data packets according to the configuration and management of the control device.
  • an address allocation method according to an embodiment of the present invention is applied to a system for separating a control plane from a forwarding plane, including:
  • the forwarding device accepts an address request sent by the external network element, where the address request includes a DHCP request of the user equipment UE and user feature information of the UE;
  • the forwarding device acquires, according to the DHCP request, an IP address allocated to the UE to the DHCP service network element.
  • the forwarding device acquires the first indication information that is sent by the control device according to the user feature information of the UE and the IP address allocated for the UE, where the first indication information is used to indicate that when the packet whose destination address is an IP address is received, according to the user Feature information, sending a message to the UE, where the control device is a device that controls the forwarding device;
  • the forwarding device sends an IP address to the UE according to the user characteristic information.
  • the forwarding device acquires an IP address allocated for the UE to the DHCP service network element according to the DHCP request, and specifically includes: the forwarding device sends a DHCP request to the DHCP service network element, and receives a DHCP request response sent by the DHCP service network element, where the DHCP
  • the request response includes an IP address assigned to the UE, and the destination address of the DHCP request response is an IP address allocated to the UE.
  • the forwarding device sends the IP address to the UE according to the user characteristic information, and the method includes: the forwarding device sends the DHCP request according to the first indication information. Respond to the UE.
  • the forwarding device acquires, according to the DHCP request, the IP address that is allocated to the UE to the DHCP service network element, where the forwarding device acquires the first indication information that is sent by the control device according to the user feature information of the UE and the IP address allocated for the UE, and specifically includes: The forwarding device sends a DHCP request and user feature information of the UE to the control device; wherein, the control device integrates the DHCP service;
  • the forwarding device receives the IP address and the first indication information that are sent by the control device and allocated to the UE.
  • the forwarding device acquires an IP address allocated to the UE to the DHCP service network element according to the DHCP request, and specifically includes: the forwarding device sends a DHCP request to the DHCP server; The forwarding device receives an IP address assigned by the DHCP server to the UE;
  • the forwarding device acquires the first indication information that is sent by the control device according to the user feature information of the UE and the IP address allocated for the UE, and specifically includes: the forwarding device sends the IP address allocated to the UE and the user feature information of the UE to the control device, and receives The first indication information that is sent by the control device according to the IP address allocated to the UE and the user feature information of the UE. Further, the forwarding device sends a DHCP request to the DHCP server, specifically: the forwarding device sends a DHCP request to the control device;
  • the forwarding device receives the second indication information sent by the control device, where the second indication information is used to indicate that when the DHCP request is received, the DHCP request is forwarded to the DHCP server; and the forwarding device sends the DHCP request to the DHCP server, specifically: the forwarding device is configured according to the second The indication information sends a DHCP request to the DHCP server through the communication unit.
  • This embodiment provides a method for allocating an IP address, and implements a function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane. Compared with the prior art, the SAE network of the SDN is solved. The shortcomings of users in the architecture that cannot obtain addresses through DHCP.
  • another method for address allocation according to an embodiment of the present invention which is applied to a system for separating a control plane from a forwarding plane, includes:
  • the control device acquires the user feature information of the user equipment UE and the IP address allocated to the UE.
  • the control device acquires the user feature information of the user equipment UE and the IP address allocated to the UE, which may include: The DHCP request of the UE and the user feature information of the UE sent by the device; wherein, the control device integrates the DHCP service;
  • the control device allocates an IP address to the UE
  • the control device delivers the user identity information of the UE and the IP address assigned to the UE.
  • the control device receives the IP address assigned by the forwarding device and the user feature information of the UE, and sends the first indication information to the forwarding device according to the IP address allocated to the UE and the user feature information of the UE.
  • the specific may further include:
  • the control device receives the DHCP request of the UE sent by the forwarding device;
  • the control device sends the second indication information to the forwarding device, and the second indication information is used to indicate that the forwarding device forwards the DHCP request to the DHCP server when receiving the DHCP request.
  • the control device sends the first indication information to the forwarding device, where the first indication information is used to indicate that the forwarding device sends a packet to the UE according to the user characteristic information when receiving the packet whose destination address is an IP address, where the forwarding device Controlled by the control device.
  • This embodiment provides a method for allocating an IP address, and implements a function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane. Compared with the prior art, the SAE network of the SDN is solved. The shortcomings of users in the architecture that cannot obtain addresses through DHCP.
  • FIG. 4 On the basis of the embodiment of FIG. 2 and FIG. 3, referring to FIG. 4, a detailed embodiment of an address allocation method is provided.
  • the feature of this embodiment is that the control device integrates the DHCP service, and the DHCP can be completed by the control device.
  • the address allocation function or the DHCP address allocation device is directly connected to the control device. The specific steps are as follows:
  • the external network element sends an address request to the forwarding device.
  • the exemplary address request includes the DHCP request of the UE and the user feature information of the UE.
  • the eNodeB encapsulates the user feature information and the DHCP request message of the UE into a GPRS Tunneling Protocol (GTP) to obtain an address request.
  • GTP GPRS Tunneling Protocol
  • the user feature information is used to identify the user feature, and the information includes, but is not limited to, a Tunnel Ending Identifier (TEID) information or a Media Access Control (MAC) address.
  • TEID Tunnel Ending Identifier
  • MAC Media Access Control
  • embodiments of the present invention select TEID information as user feature information.
  • the forwarding device sends an address request to the control device;
  • the forwarding device after receiving the address request, does not pre-install the upstream table related to the address request, so that the forwarding device cannot find the corresponding flow table according to the address request, and the address request cannot be processed.
  • the forwarding device may send the received packet that cannot be matched by the flow table to the control device, and send the address request to the control device in this manner;
  • the flow table may include a matching field field, a counter, and an instruction set, where the matching domain field is a ten-tuple, which is an input keyword matching the packet, and can match five layers of data from the Ethernet layer to the transport layer.
  • the matching domain field is a ten-tuple, which is an input keyword matching the packet, and can match five layers of data from the Ethernet layer to the transport layer.
  • 36 headers for header field matching; counters are used to count statistics of flow entries; the instruction set indicates the operations that should be performed on packets matching the flow entry.
  • the most basic operational behavior includes forwarding to a certain Ports are forwarded and discarded after the packet is rewritten.
  • the forwarding device If the packet that enters the forwarding device has a field that matches the matching field in the flow table, the forwarding device operates the packet according to the instruction set in the flow table; if the packet that enters the forwarding device does not have a flow table If the matching field matches the field, the forwarding device can send the message to the control device.
  • the generation, maintenance, and delivery of the flow table itself are completely realized by the control device.
  • the forwarding device may use a Packet-in message to send an address request to the control device.
  • the control device acquires the user feature information of the UE according to the received address request and allocates an IP address to the UE. For example, after receiving the Packet-in message sent by the forwarding device, the control device performs GTP decapsulation on the message. Obtaining the user feature information of the UE and the DHCP request message, and the control device delivers the DHCP request message to the DHCP module included in the control device for processing, so that the DHCP module allocates an IP address to the UE according to the DHCP request message, and the UE is configured as the UE. The assigned IP address is encapsulated in a DHCP request response. With this At the same time, the control device also maintains the relationship between the IP address and the user feature information. Specifically, the control device can maintain the corresponding relationship between the IP address and the user feature information in the form of a mapping table.
  • the control device sends the IP address allocated by the UE and the first indication information to the forwarding device.
  • the control device sends a DHCP request response and a first indication information that includes the IP address assigned to the UE to the forwarding device, where the first indication information is used to indicate that the forwarding device receives the destination address as an IP address allocated for the UE.
  • the packet is sent to the UE according to the user characteristic information.
  • the first indication information may include a downlink flow table that is matched by using an IP address allocated for the UE, so that the forwarding device can send the downlink information to the user that uses the IP address allocated for the UE, in the embodiment of the present invention.
  • the DHCP request response is a kind of downlink message.
  • control device can also send an upstream table to the forwarding device, and the upstream table is matched according to the user characteristic information. Because the IP address assigned to the UE is corresponding to the user characteristic information, the upstream table can The forwarding device is configured to process the uplink packet sent by the UE that uses the IP address allocated for the UE according to the user feature information.
  • the forwarding device sends, according to the first indication information, an IP address assigned to the UE to
  • the first indication information includes a downlink table that is matched by using an IP address allocated for the UE, and the forwarding device may encapsulate the DHCP request response with the user feature information into a GTP packet according to the downstream table, and send the packet to the eNodeB.
  • the DHCP request response is sent to the UE according to the user feature information, so that the UE obtains the IP address allocated to the UE in the DHCP request response, completes the IP address allocation to the UE, and the UE can subsequently The communication is performed using the IP address assigned to the UE.
  • This embodiment provides a method for allocating an IP address, and implements a function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • the SAE network of the SDN is solved.
  • the shortcomings of users in the architecture that cannot obtain addresses through DHCP. Based on the embodiment of FIG. 2 and FIG. 3, referring to FIG. 5, another detailed embodiment of an address allocation method is provided.
  • the features of this embodiment are the same as the embodiment shown in FIG. 4, and the control device integrates DHCP.
  • the service may be performed by the control device to complete the DHCP address allocation function or the DHCP address allocation device is directly connected to the control device.
  • the DHCP address allocation function is selected by the control device in this embodiment.
  • the specific steps are as follows:
  • the control device sends an upstream table to the forwarding device.
  • the address request sent by the UE belongs to the uplink packet. Therefore, the control device may send the upstream flow table to the forwarding device in advance, so that the forwarding device can perform the corresponding uplink packet according to the upstream flow table. deal with.
  • the upstream flow table may include the forwarding device to decapsulate the GTP packet of the address request, and if the DHCP request packet is found, send the DHCP request packet together with the TEID information in the address request GTP packet. To the control device.
  • the external network element sends an address request to the forwarding device.
  • the embodiment is similar to the embodiment shown in FIG. 4, and the address request is obtained by encapsulating the user feature information of the UE and the DHCP request message into a GTP message by using the eNodeB.
  • the user feature information is used to identify the user feature, and optionally includes TEID information or a MAC address.
  • embodiments of the present invention select TEID information as user feature information.
  • the forwarding device sends an address request to the control device.
  • the forwarding device decapsulates the GTP packet requested by the address according to the upstream table received in step 501, and finds that the DHCP request packet is a DHCP request message and an address request GTP.
  • the TEID information in the message is sent to the control device.
  • the IP address assigned by the control device to the UE For example, the DHCP module included in the control device itself may allocate a corresponding IP address to the UE side according to the received DHCP request message, encapsulated in the DHCP request response, and controlled.
  • the device can assign the IP address to the UE in the form of a mapping table. Corresponds to the TEID information.
  • the control device sends the IP address allocated by the UE and the first indication information to the forwarding device.
  • the control device sends the IP address assigned to the UE and the first indication information to the forwarding device, where the IP address allocated for the UE may be included in the DHCP request response.
  • the first indication information is used to indicate that the forwarding device receives the packet whose destination address is the IP address allocated to the UE, and sends the packet to the UE according to the user characteristic information.
  • the first indication information may be represented by using a downlink table that uses the IP address to perform matching in step 404 in the embodiment in FIG. 4; or the DHCP request response may be encapsulated into an address response GTP packet by the control device.
  • the packet is sent to the forwarding device, where the packet header includes the TEID of the UE side as the first indication information. This embodiment selects the manner described in the latter as the first indication information.
  • the forwarding device sends, according to the first indication information, an IP address allocated to the UE to the UE side.
  • the forwarding device receives the address response GTP packet sent by the control device, and the forwarding device decapsulates the GTP packet to obtain a DHCP request response, and responds to the TEID information included in the GTP packet header according to the address response.
  • the DHCP request response is directly sent to the UE side corresponding to the TEID information, so that the UE side acquires the IP address allocated for the UE.
  • This embodiment provides a method for allocating an IP address, and implements a function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane. Compared with the prior art, the SAE network of the SDN is solved. The shortcomings of users in the architecture that cannot obtain addresses through DHCP.
  • FIG. 6 On the basis of the embodiment of FIG. 2 and FIG. 3, referring to FIG. 6, a detailed embodiment of another address allocation method is provided.
  • the specific feature of the embodiment is that the DHCP address allocation function is provided by a DHCP server external to the core network.
  • the implementation steps are as follows:
  • the external network element sends an address request to the forwarding device.
  • the address request includes a user characteristic letter.
  • the address request sent by the external network element is obtained by the eNodeB encapsulating the DHCP request message of the UE and carrying the user feature information of the UE into a GTP message.
  • the user feature information is used to identify the user feature, and optionally has TEID information or a MAC address.
  • this embodiment selects TEID information as user feature information.
  • the forwarding device sends an address request to the control device.
  • the forwarding device does not pre-install the upstream table related to the address request, so that the forwarding device cannot find the corresponding flow table according to the address request, so that the address request cannot be processed, and the forwarding device can The received message that cannot be matched by the flow table is sent to the control device, and the address request is sent to the control device in this way.
  • the control device acquires user feature information of the UE according to the received address request, and sends the second indication information to the forwarding device.
  • the second indication information may specifically be an upstream table that is sent by the control device to the forwarding device, so that the forwarding device can process the address request according to the upstream table.
  • the control device After receiving the address request sent by the forwarding device, the control device establishes an upstream flow table according to the DHCP request message in the address request, so that the forwarding device can send the DHCP request message to the DHCP server according to the upstream flow table.
  • the forwarding device sends an address request to the DHCP server according to the second indication information.
  • the forwarding device may decapsulate the address request GTP packet according to the upstream table as the second indication information, and send the DHCP request packet to the DHCP server.
  • the DHCP server sends the IP address assigned to the UE to the forwarding device. Typically, after receiving the DHCP request, the DHCP server allocates a corresponding IP address to the UE, and the DHCP server allocates the IP address to the UE. The IP address is encapsulated in a DHCP request response and sent to the forwarding device.
  • the forwarding device sends the IP address and user feature information allocated to the UE to the control device.
  • the forwarding device sends the received flow table matching DHCP request response to the control device for processing, so that the control device can identify the UE with the assigned IP address.
  • the forwarding device sends the first indication information to the forwarding device according to the IP address and the user feature information allocated to the UE.
  • the control device sends the IP address and the first indication information that are allocated to the UE to the forwarding device.
  • the control device passes the IP address and user feature information allocated to the UE in the received DHCP request response through the mapping table.
  • the first indication information is generated, where the first indication information is used to indicate that the forwarding device receives the packet whose destination address is the IP address allocated to the UE, and then sends the packet to the UE according to the user characteristic information.
  • the first indication information may include a downlink flow table that is matched by using an IP address allocated for the UE, so that the forwarding device can send the downlink packet to the user that uses the IP address allocated for the UE, in the embodiment of the present invention.
  • the DHCP request response belongs to a downlink packet.
  • the forwarding device sends, according to the first indication information, an IP address assigned to the UE to
  • the forwarding device may encapsulate the DHCP request response with the user feature information into a GTP message according to the downstream table, and send the GTP message to the eNodeB, and finally, the eNodeB decapsulates the GTP message according to the user characteristic information.
  • the DHCP request response is sent to the UE, so that the UE obtains the IP address allocated to the UE in the DHCP request response, completes the IP address allocation to the UE, and the UE can subsequently communicate using the IP address allocated for the UE.
  • This embodiment provides a method for allocating an IP address, and implements a function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • the control device sends the second indication information to the forwarding device in advance;
  • control device sends the second indication information to the forwarding device in advance, where the second indication information includes an upstream table, so that the forwarding device can process the uplink packet sent by the user, for example, the address sent by the UE.
  • the request belongs to an uplink message.
  • the external network element sends an address request to the forwarding device.
  • the address request includes the DHCP request of the UE and the user feature information of the UE, where the user feature information is used to identify the user feature.
  • this embodiment selects TEID information as user feature information.
  • the address request sent by the external network element is obtained by the eNodeB encapsulating the UE's DHCP request message and carrying the UE's user feature information into a GTP message.
  • the forwarding device sends the address request to the DHCP server according to the second indication information.
  • the forwarding device since the forwarding device is pre-installed with the upstream table, so that the forwarding device can process the received address request, the forwarding device can decapsulate the address request GTP packet according to the upstream table, and report the DHCP request. The text is sent to the DHCP server.
  • the DHCP server sends the IP address assigned to the UE to the forwarding device. Similar to step 605 in the foregoing embodiment, after receiving the DHCP request, the DHCP server allocates a corresponding IP address to the UE, and the DHCP server will The IP address assigned to the UE is encapsulated in a DHCP request response and sent to the forwarding device.
  • the forwarding device sends the IP address and user feature information allocated to the UE to the control device.
  • the transmitting device sends the received flow table matching DHCP request response to the control device for processing.
  • the forwarding device combines the DHCP request response with the corresponding user feature information. Sending to the control device, the control device sends the first indication information to the forwarding device according to the IP address and the user feature information allocated for the UE. .
  • the control device sends the IP address allocated by the UE and the first indication information to the forwarding device.
  • the control device performs the first indication information by using the mapping between the IP address and the user feature information allocated to the UE in the received DHCP request response.
  • the first indication information is used to indicate that the forwarding device sends the packet to the UE according to the user characteristic information after receiving the packet whose destination address is the IP address allocated for the UE.
  • the first indication information may include a downlink flow table that is matched by using an IP address, so that the forwarding device can send the downlink packet to the user who uses the IP address allocated for the UE, and the DHCP request response in the embodiment of the present invention is It belongs to a kind of downlink message.
  • the forwarding device sends the IP address allocated to the UE to the UE side according to the first indication information.
  • the forwarding device may encapsulate the DHCP request response with the user feature information according to the downlink table.
  • the eNodeB decapsulates the GTP packet, and then sends the DHCP request response to the UE according to the user feature information, so that the UE obtains the IP address allocated to the UE in the DHCP request response, and completes the UE.
  • the IP address is assigned, and the UE can subsequently communicate using the IP address.
  • This embodiment provides a method for allocating an IP address, and implements a function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane. Compared with the prior art, the SAE network of the SDN is solved. The shortcomings of users in the architecture that cannot obtain addresses through DHCP.
  • the embodiment of the present invention provides a forwarding device 80, which is applied to a system in which a control plane and a forwarding plane of an SDN are separated, and a specific form of the forwarding device in the embodiment of the present invention
  • the specific forwarding device may be a separate forwarding device, or may be combined with the control device.
  • the forwarding device 80 includes:
  • the receiving unit 801 is configured to receive an address request sent by the external network element, where the address request includes a DHCP request of the user equipment UE and user feature information of the UE;
  • the obtaining unit 802 is configured to acquire, by the DHCP service network element, an IP address allocated for the UE according to the DHCP request.
  • the obtaining unit 802 is further configured to: acquire the first indication information that is sent by the control device according to the user feature information of the UE and the IP address allocated for the UE, where the first indication information is used to indicate that the destination address is the IP address allocated for the UE.
  • the message is sent to the UE according to the user feature information, where the control device is a device that controls the forwarding device, and the sending unit 803 is configured to send the IP address allocated to the UE to the UE according to the user feature information.
  • the eNodeB encapsulates the user feature information and the DHCP request message into a GTP message to obtain an address request.
  • the user feature information is used to identify the user feature, and optionally includes TEID information or a MAC address.
  • TEID information is used as user feature information.
  • the obtaining unit 802 is further configured to: send a DHCP request to the DHCP service network element, and receive a DHCP request response sent by the DHCP service network element, where the DHCP request response includes an IP address allocated for the UE, and a destination address of the DHCP request response.
  • the IP address assigned to the UE; the sending unit 803 is further configured to: send a DHCP request response to the UE according to the first indication information.
  • the first indication information may include a downlink flow table that is matched by using an IP address
  • the sending unit 803 may encapsulate the DHCP request response with the user feature information into a GTP packet according to the downstream flow table, and send the information to the eNodeB, and finally, the eNodeB
  • the DHCP request response is sent to the UE according to the user feature information, so that the UE obtains the IP address allocated to the UE in the DHCP request response, and completes the IP address allocation to the UE.
  • the flow table may include a matching domain field, a counter, and an instruction set, where the matching domain field is a ten-tuple, which is an input keyword matching the packet, and can match five layers of data from the Ethernet layer to the transport layer.
  • the matching domain field is a ten-tuple, which is an input keyword matching the packet, and can match five layers of data from the Ethernet layer to the transport layer.
  • 36 headers for header field matching; counters are used to count statistics for flow entries; the instruction set indicates what operations should be performed on packets that match the flow entry.
  • the most basic operational behaviors include forwarding to a port, forwarding and rewriting packets, and forwarding.
  • the forwarding device 80 If the packet entering the forwarding device 80 has a field matching the matching field field in the flow table, the forwarding device 80 operates the packet according to the instruction set in the flow table; if there is no packet entering the forwarding device 80 The forwarding device 80 can send the message to the control device if the field matches the matching field field in the flow table.
  • the generation, maintenance, and execution of the flow table itself are completely realized by the control device.
  • the first indication information may be that the control device encapsulates the DHCP request response into an address response GTP, and includes a TEID header of the UE, so that the sending unit 803 is configured according to the packet header that includes the TEID of the UE.
  • the address response GTP packet is sent to the corresponding UE.
  • the obtaining unit 802 may include: a first sending subunit 8021, configured to send a DHCP request and user feature information of the UE to the control device, where the control device integrates the DHCP service;
  • the first receiving subunit 8022 is configured to receive an IP address and first indication information that are sent by the control device and allocated to the UE.
  • the first sending sub-unit 8021 sends the DHCP request and the user feature information of the UE to the control device, and after the forwarding device 80 receives the address request, the forwarding device 80 is caused by not pre-installing the upstream table related to the address request.
  • the address table cannot be found to be matched according to the address request, and the address request cannot be processed.
  • the forwarding device 80 can send the received packet that cannot be matched by the flow table to the control device. Way to send an address request to the control device; or,
  • the first sending sub-unit 8021 sends the DHCP request and the user feature information of the UE to the control device, and the control device sends the upstream table to the forwarding device 80 in advance, so that the first sending sub-unit 8021 can report the uplink according to the upstream table.
  • the upstream flow table may include the forwarding device 80 decapsulating the GTP packet of the address request, and if the DHCP request packet is found, the DHCP request packet is combined with the TEID information in the address request GTP packet. For example, referring to FIG.
  • the obtaining unit 802 may further include: a second sending sub-unit 8023, configured to send a DHCP request to the DHCP server; and a second receiving sub-unit 8024, configured to receive the sending by the DHCP server.
  • the IP address assigned to the UE; the second sending sub-unit 8023 is further configured to send the IP address allocated to the UE and the user feature information of the UE to the control device, so that the control device is configured according to the IP address and user feature information allocated for the UE.
  • the first indication information is sent to the forwarding device 80. Further, before the second sending subunit 8023 sends a request for acquiring the address of the UE to the DHCP server;
  • the sending unit 803 is further configured to: send a DHCP request of the UE to the control device; the receiving unit 801 is further configured to: receive the second indication information that is sent by the control device, where the second indication information is used to indicate that when the address request of the UE is received, Forwarding the DHCP request of the UE to the DHCP server;
  • the second indication information may be an upstream flow table sent by the control device to the forwarding device 80, so that the forwarding device 80 can process the address request according to the upstream flow table.
  • the sending unit 803 sends the address request of the UE to the control device
  • the receiving unit 801 receives the second indication information that is sent by the control device.
  • the second indication information is that the control device receives the DHCP request according to the address request.
  • the packet establishes an upstream flow table, so that the forwarding device 80 can send the DHCP request message to the DHCP server according to the upstream flow table;
  • the receiving unit 801 may also receive, in advance, the second indication information that is sent by the control device, where the second indication information includes the upstream flow table, so that the forwarding device 80 can process the uplink packet sent by the user, in this embodiment.
  • the address request sent by the UE belongs to an uplink packet.
  • the sending unit 803 is further configured to: send, according to the second indication information, a DHCP request of the UE to the DHCP server; Specifically, the sending unit 803 may decapsulate the address request GTP packet according to the upstream table in the second indication information, and send the DHCP request packet to the DHCP server.
  • the second sending sub-unit 8023 is further configured to: send the IP address and user feature information allocated to the UE to the control device; specifically, because there is no corresponding downstream table, the forwarding device 80 will receive the flow table that cannot be received.
  • the matching DHCP request response is sent to the control device for processing.
  • the forwarding device 80 sends the DHCP request response together with the corresponding user characteristic information to the control device.
  • the first indication information is generated by the control device according to the IP address and the user feature information allocated for the UE, so that the forwarding device 80 forwards the IP address allocated for the UE to the corresponding UE.
  • the embodiment provides a forwarding device 80, which implements the function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • a forwarding device 80 which implements the function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • the embodiment of the present invention provides a control device 100, which is applied to a system in which the control plane and the forwarding plane of the SDN are separated.
  • the specific form of the control device is not specifically limited, and may be a separate control device. It can also be combined with the forwarding device.
  • the control device 100 can include:
  • the obtaining unit 1001 is configured to acquire the user feature information of the UE and the IP address allocated to the UE.
  • the sending unit 1002 is configured to send the first indication information to the forwarding device, where the first indication information is used to indicate that the forwarding device receives the destination address as When the packet of the IP address is sent, the packet is sent to the UE according to the user characteristic information, where the forwarding device is controlled by the control device 100.
  • the user feature information is used to identify the user feature, and optionally includes TEID information or a MAC address.
  • TEID information is used as user feature information.
  • the IP address assigned to the UE may be included in the DHCP request response;
  • the specific form of the first indication information may include a downstream flow table matching the IP address, so that the forwarding device can send the downlink message to the user who uses the IP address allocated for the UE; or
  • the control device 100 encapsulates the DHCP request response into an address response GTP file and sends it to the forwarding device, where the packet header includes the TEID of the UE as the first indication information.
  • the flow table may include a matching domain field, a counter, and an instruction set, where the matching domain field is a ten-tuple, which is an input keyword matching the text, and may match five layers from the Ethernet layer to the transport layer. 36 headers for header field matching in the packet header; counters are used to count statistics for stream entries; the instruction set indicates what operations should be performed on packets matching the flow entry. The most basic operational behaviors include forwarding to a port, forwarding and rewriting packets, and forwarding.
  • the forwarding device If the packet that enters the forwarding device has a field that matches the matching field in the flow table, the forwarding device operates the packet according to the instruction set in the flow table; if the packet that enters the forwarding device does not have a flow table If the matching field matches the field, the forwarding device can send the message to the control device 100.
  • the generation, maintenance, and delivery of the flow table itself are completely implemented by the control device 100.
  • the obtaining unit 1001 may include:
  • the first receiving sub-unit 1001 1 is configured to receive a DHCP request of the UE and a user feature information of the UE, where the control device integrates the DHCP service.
  • the user feature information is TEID.
  • the allocation subunit 10012 is configured to allocate an IP address to the UE.
  • the control device 100 may perform a one-to-one correspondence between the IP address allocated for the UE and the TEID information in the form of a mapping table.
  • the sending subunit 10013 is configured to be used according to the user of the UE.
  • the feature information and the IP address assigned to the UE are delivered to the IP address and the first indication information allocated to the UE to the forwarding device.
  • the obtaining unit 1001 may further include:
  • a second receiving subunit 10014 configured to receive, by the forwarding device, an allocation for the UE
  • the IP address and the user feature information of the UE are sent to the forwarding device according to the IP address assigned to the UE and the user feature information of the UE.
  • the second receiving subunit 10014 may include: a receiving module 100141, configured to receive a DHCP request of the UE sent by the forwarding device, a sending module 100142, configured to send the second indication information to the forwarding device, where the second indication information is used to indicate When the forwarding device receives the DHCP request, it forwards the DHCP request to the DHCP server.
  • the second indication information may be an uplink table that is sent by the control device 100 to the forwarding device, so that the forwarding device can process the address request according to the upstream table, where the second indication information can be pre-installed in the forwarding device.
  • the receiving module 100141 may establish an upstream table as the second indication information according to the DHCP request message in the address request, which is not limited in this embodiment.
  • the embodiment provides a control device 100, which implements the function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane. Compared with the prior art, the SAE network architecture of the SDN is solved. The disadvantage of the user not being able to obtain the address by DHCP.
  • the embodiment of the present invention provides a forwarding device 80, which is applied to a system in which the control plane and the forwarding plane of the SDN are separated.
  • the specific form of the control device is not specifically limited, so that the present invention can be implemented.
  • the method for any of the foregoing IP address assignments provided by the embodiment is as follows. Referring to FIG. 12, the method includes: at least one communication unit 1201, a processor 1202, a memory 1203, and a bus 1204. The at least one communication unit 1201, the processor 1202, and the memory The 1203 connects and completes communication with each other through the bus 1204.
  • the bus 1204 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Wait.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus 1204 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 12, but it does not mean that there is only one bus or one type of bus. among them:
  • Memory 1203 is for storing executable program code, the program code including computer operating instructions.
  • the memory 1203 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • the storage device stores: an operating system, an application, and program code for implementing an embodiment of the present invention.
  • the operating system is used to control and implement the processing functions performed by the processing unit.
  • the application contains program code such as word processing software and email software.
  • the processor 1202 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more configured to implement the embodiments of the present invention. integrated circuit.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the communication unit 1201 is configured to communicate with an external network element.
  • the processor 1202 is configured to: receive, by the communication unit 1201, an address request that is sent by the external network element, where the address request includes a DHCP request of the user equipment UE and user feature information of the UE; and acquire the UE as a UE according to the DHCP request.
  • the first indication information is used by the communication unit 1201 to obtain the first indication information that is sent by the control device according to the user characteristic information of the UE and the IP address allocated for the UE.
  • the first indication information is used to indicate that the destination address is allocated for the UE.
  • the message of the IP address is sent to the UE according to the user feature information, where the control device is a device that controls the forwarding device 80; and the IP address assigned to the UE is sent to the UE through the communication unit 1201 according to the user feature information. .
  • the eNodeB after the UE sends the DHCP request message to the eNodeB, the eNodeB encapsulates the user feature information and the DHCP request message into a GTP message to obtain an address request.
  • the user feature information is used to identify the user feature, and optionally includes TEID information or a MAC address.
  • embodiments of the present invention select TEID information as user feature information.
  • the processor 1202 is further configured to: send a DHCP request to the DHCP service network element, and receive a DHCP request response sent by the DHCP service network element, where
  • the DHCP request response includes an IP address assigned to the UE, and the destination address of the DHCP request response is an IP address allocated by the UE.
  • the processor 1202 sends a DHCP request response to the UE through the communication unit 1201 according to the first indication information.
  • the first indication information may include a downstream flow table that is matched by using an IP address
  • the processor 1202 may encapsulate the DHCP request response and the TEID into a GTP text according to the downstream flow table, and send the same to the eNodeB through the communication unit 1201, and finally After the eNodeB decapsulates the GTP packet, the DHCP request response is sent to the UE according to the TEID, so that the UE obtains the IP address allocated to the UE in the DHCP request response, and completes the IP address allocation to the UE; wherein, as shown in Table 1, the flow The table may include a matching field field, a counter, and an instruction set, where the matching domain field is a ten-tuple, which is an input keyword matching the packet, and may match 36 types of headers from the Ethernet layer to the transport layer.
  • the matching field is used to count the statistics of the flow entry; the instruction set indicates the operation that the packet matching the flow entry should perform.
  • the most basic operational behaviors include forwarding to a port, forwarding and rewriting packets, and forwarding. If the packet entering the forwarding device 80 has a field matching the matching field field in the flow table, the forwarding device 80 operates the packet according to the instruction set in the flow table; if there is no packet entering the forwarding device 80 The forwarding device 80 can send the message to the control device if the field matches the matching field field in the flow table. The generation, maintenance, and delivery of the flow table itself are completely realized by the control device.
  • the first indication information may be that the control device encapsulates the DHCP request response into an address response GTP, and includes a TEID header of the UE, so that the processor 1202 includes the TEID of the UE.
  • the message header sends the address response GTP ⁇ message to the corresponding UE through the communication unit 1201.
  • the processor 1202 obtains an IP address allocated to the UE from the DHCP service network element according to the DHCP request, and may include:
  • the processor 1202 is configured to: send, by using the communication unit 1201, a DHCP request to the control device, and user feature information of the UE, where the control device integrates the DHCP service;
  • the IP address and the first indication information allocated by the control device for the UE are received by the communication unit 1201.
  • the processor 1202 sends the DHCP request and the user feature information of the UE to the control device by using the communication unit 1201.
  • the forwarding device 80 After the forwarding device 80 receives the address request, the forwarding device does not pre-install the upstream table related to the address request. 80 cannot find the corresponding flow table to match according to the address request, and the address request cannot be processed. At this time, the forwarding device 80 can send the received packet that cannot be matched by the flow table to the control device. Ways to send an address request to the control device; or,
  • the processor 1202 sends the DHCP request and the user feature information of the UE to the control device through the communication unit 1201, or the control device sends the uplink table to the forwarding device 80 in advance, so that the processor 1202 can perform the uplink packet according to the upstream flow table.
  • the upstream flow table may include the forwarding device 80 decapsulating the GTP packet of the address request, and if the DHCP request packet is found, the DHCP request packet is combined with the TEID information in the address request GTP packet.
  • the processor 1202 obtains the IP address allocated to the UE from the DHCP service network element according to the DHCP request, and may also include:
  • a processor configured to: send a DHCP request to the DHCP server by using the communication unit 1201; receive, by the communication unit 1201, an IP address that is sent by the DHCP server and allocated to the UE; the processor 1202 is further configured to: send, by the communication unit 1201, the IP allocated for the UE The address and the user feature information of the UE are sent to the control device, so that the control device sends the first indication information to the forwarding device 80 according to the IP address and the user feature information allocated for the UE.
  • the processor 1202 sends a request for acquiring the address of the UE to the DHCP server through the communication unit 1201;
  • the processor 1202 is also configured to: Sending, by the communication unit 1201, the DHCP request of the UE to the control device; receiving, by the communication unit 1201, the second indication information sent by the control device, where the second indication information is used to indicate that when the address request of the UE is received, the DHCP request of the UE is forwarded to the DHCP.
  • Monthly server ;
  • the second indication information may be an upstream flow table sent by the control device to the forwarding device 80, so that the forwarding device 80 can process the address request according to the upstream flow table.
  • the second indication information sent by the control device may be received by the communication unit 1201, where the second indication information is that the control device requests the address according to the address.
  • the DHCP request message in the middle establishes an upstream flow table, so that the forwarding device 80 can send the DHCP request message to the DHCP server according to the upstream flow table;
  • the processor 1202 may further receive, by using the communication unit 1201, the second indication information that is sent by the control device, where the second indication information includes an upstream flow table, so that the forwarding device 80 can process the uplink packet sent by the user.
  • the address request sent by the UE belongs to an uplink packet.
  • the processor 1202 is configured to send, by using the communication unit 1201, the DHCP request of the UE to the DHCP server according to the second indication information. Specifically, the processor 1202 may send the address request GTP according to the upstream table in the second indication information. The message is unblocked and the DHCP request message is sent to the DHCP server.
  • the processor 1202 sends the IP address and user feature information allocated to the UE to the control device through the communication unit 1201. Specifically, because there is no corresponding downstream table, the forwarding device 80 matches the received flow table to the DHCP. The request response is sent to the control device for processing. In order to enable the control device to identify the UE side information of the assigned IP address, the forwarding device 80 sends the DHCP request response together with the corresponding user feature information to the control device. The first indication information is generated by the control device according to the IP address and TEID allocated for the UE, so that the forwarding device 80 forwards the IP address allocated for the UE to the corresponding UE.
  • the embodiment provides a forwarding device 80, which implements the function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • a forwarding device 80 which implements the function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • the embodiment of the present invention provides a control device 100, which is applied to a system in which the control plane and the forwarding plane of the SDN are separated.
  • the specific form of the control device 100 is not specifically limited, and may be a separate control.
  • the device may also be combined with the forwarding device.
  • the control device 100 may include:
  • the method includes: at least one communication unit 1301, a processor 1302, a memory 1303, and a bus 1304.
  • the at least one communication unit 1301, the processor 1302, and the memory 1303 are connected by a bus 1304 and complete communication with each other.
  • the bus 1304 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Wait.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus 1204 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 12, but it does not mean that there is only one bus or one type of bus. among them:
  • Memory 1303 is for storing executable program code, the program code including computer operating instructions.
  • the memory 1303 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • the storage device stores: an operating system, an application, and program code for implementing an embodiment of the present invention.
  • the operating system is used to control and implement the processing functions performed by the processing unit.
  • the application contains program code such as word processing software and email software.
  • the processor 1302 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more configured to implement the embodiments of the present invention. integrated circuit.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • a communication unit 1301, configured to communicate with an external network element
  • the processor 1302 is configured to acquire user feature information of the user equipment UE and an IP address allocated to the UE. Transmitting, by the communication unit 1301, the first indication information to the forwarding device, where the first indication information is used to indicate that when the packet whose destination address is the IP address is received, the packet is sent to the UE according to the user characteristic information, where the forwarding device is configured by The control device 100 performs control.
  • the user feature information is used to identify the user feature, and optionally includes TEID information or a MAC address.
  • TEID information select TEID information as user feature information.
  • the IP address assigned to the UE may be included in the DHCP request response.
  • the first indication information may specifically include a downstream flow table that uses the IP address to match, so that the forwarding device can send the downlink packet to the UE for use. The user of the assigned IP address;
  • the control device 100 encapsulates the DHCP request response into an address response GTP file and sends it to the forwarding device, where the packet header includes the TEID of the UE side as the first indication information.
  • the flow table may include a matching domain field, a counter, and an instruction set, where the matching domain field is a ten-tuple, which is an input keyword matching the text, and may match five layers from the Ethernet layer to the transport layer. 36 headers for header field matching in the packet header; counters are used to count statistics for stream entries; the instruction set indicates what operations should be performed on packets matching the flow entry. The most basic operational behaviors include forwarding to a port, forwarding and rewriting packets, and forwarding.
  • the forwarding device If the packet that enters the forwarding device has a field that matches the matching field in the flow table, the forwarding device operates the packet according to the instruction set in the flow table; if the packet that enters the forwarding device does not have a flow table If the matching field matches the field, the forwarding device can send the message to the control device 100.
  • the generation, maintenance, and delivery of the flow table itself are completely implemented by the control device 100.
  • the processor 1302 is configured to acquire user characteristic information of the UE and an IP address allocated to the UE, specifically:
  • the processor 1302 is configured to: receive, by the communication unit 1301, a DHCP request of the UE and a user feature information of the UE, where the control device integrates the DHCP service, where The user characteristic information is the TEID; the IP address is allocated to the UE; specifically, after the processor 1302 allocates the IP address to the UE, the IP address allocated to the UE may be in one-to-one correspondence with the TEID information in the form of a mapping table;
  • the IP address and the first indication information allocated to the UE are delivered to the forwarding device according to the user feature information of the UE and the IP address allocated for the UE.
  • the processor 1302 is configured to acquire user characteristic information of the UE and an IP address allocated to the UE, specifically:
  • the processor 1302 receives, by the communication unit 1301, the IP address allocated by the forwarding device and the user feature information of the UE, and sends the first indication information to the forwarding device according to the IP address allocated to the UE and the user characteristic information of the U E.
  • the processor 1302 is further configured to: receive, by the communication unit 1301, a DHCP request of the UE that is sent by the forwarding device; send, by the communication unit 1301, the second indication information to the forwarding device, where the second indication information is used to indicate that the forwarding device receives the DHCP When requested, the DHCP request is forwarded to the DHCP server.
  • the second indication information may be an uplink table that is sent by the control device 100 to the forwarding device, so that the forwarding device can process the address request according to the upstream table, where the second indication information may be pre-installed on the forwarding device.
  • the communication unit 1301 establishes an upstream table as the second indication information according to the DHCP request message in the address request, which is not limited in this embodiment. .
  • the embodiment provides a control device 100, which implements the function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • a control device 100 which implements the function of obtaining an IP address by using a DHCP method when the control plane is separated from the forwarding plane.
  • An embodiment of the present invention provides an IP address allocation system.
  • the control plane is separated from the forwarding plane, and includes a forwarding device 80 and a control device 100.
  • the forwarding device 80 is any one of the forwarding devices shown in FIG. 8 and FIG. 9
  • the control device 100 is any of the control device devices shown in FIG. 10 and FIG. 11 ;
  • the forwarding device 80 is the forwarding device shown in Fig. 12, and the control device 100 is the control device shown in Fig. 13.
  • This embodiment provides an IP address allocation system, which implements the function of obtaining an IP address by a DHCP method when the control plane is separated from the forwarding plane.
  • the SAE network architecture of the SDN is solved. The disadvantage of the user being unable to obtain an address by DHCP.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • 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.
  • the 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 electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as the units may or may not be physical units, and may be located in one place or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiment of the present embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the above software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform portions of the method described in various embodiments of the present invention. Steps.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like, which can store program codes. Medium.

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Abstract

本发明实施例提供了一种IP地址分配的系统和方法,实现了在控制面与转发面分离的情况下,用户设备通过DHCP方式获取IP地址的功能,该方法包括:转发设备接受外部网元发送的地址请求,其中,所述地址请求包括用户设备UE的DHCP请求和所述UE的用户特征信息;以及根据所述DHCP请求向DHCP服务网元获取为所述UE分配的IP地址;以及获取控制设备根据所述UE的用户特征信息和为所述UE分配的IP地址下发的第一指示信息,以及根据所述用户特征信息发送所述IP地址至所述UE。

Description

一种 IP地址分配的系统和方法
技术领域
本发明涉及通信领域, 尤其涉及一种 IP 地址分配的系统和方 法。
背景技术
目前,在软件可定义网络( Software Defined Network,简称 SDN ) 中, 网络交换模型协议 OpenFlow作为 SDN 网络中的一种交换标准 实现了控制面与转发面的分离, 基于 OpenFlow这一标准, SDN 网 络的主要组成部分包括:支持 OpenFlow的转发设备和用于管理交换 设备的控制设备, 其中, 转发设备的转发行为由控制设备决定。
将 OpenFlow这一标准的 SDN引入 SAE架构之后,转发设备接 收到 用 户 侧发送过来的 动 态主机配置协议 ( Dynamic Host Configuration Protocol , 简称 DHCP ) 请求后, 无法对该请求进行响 应, 导致用户无法通过 DHCP方式获取地址。 发明内容
本发明的实施例提供一种 IP地址分配的系统和方法, 实现了在 控制设备与转发设备分离的情况下, 实现了用户通过 DHCP方式获 取 IP地址的功能, 与现有技术相比, 解决了 SDN的 SAE网络架构 下用户无法通过 DHCP方式获取地址的缺点。 为达到上述目的, 本发明实施例采用的技术方案是,
一方面, 本发明实施例提供了一种转发设备, 应用于控制面与 转发面分离的系统, 包括:
通信单元, 用于与外部网元进行通信;
处理器, 用于: 通过所述通信单元接收外部网元发送的地址请求, 其中, 所述 地址请求包括用户设备 ( User Equipment , 简称 UE ) 的 DHCP请求 和所述 UE的用户特征信息;
根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地址;
通过所述通信单元获取控制设备根据所述 UE 的用户特征信息 和为所述 UE分配的 IP地址下发的第一指示信息, 所述第一指示信 息用于指示当收到目的地址为所述 IP地址的报文时, 根据所述用户 特征信息, 发送所述报文至所述 UE ;
根据所述用户特征信息通过所述通信单元发送所述 IP 地址至 所述 UE。 在第一种可能的实现方式中, 结合第一方面, 所述处理器用于 根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地 址, 具体包括:
所述处理器用于通过所述通信单元发送所述 DHCP请求至所述 DHCP服务网元, 通过所述通信单元接收所述 DHCP 服务网元发送 的 DHCP请求响应, 其中所述 DHCP请求响应包括为所述 UE分配 的 IP地址, 所述 DHCP请求响应的目的地址为所述为 UE分配的 IP 地址; 所述处理器用于根据所述用户特征信息通过所述通信单元发送 所述 IP地址至所述 UE , 具体包括:
所述处理器用于根据所述第一指示信息, 通过所述通信单元发 送所述 DHCP请求响应至所述 UE。
在第二种可能的实现方式中, 结合第一方面或者第一种可能的 实现方式, 所述处理器用于根据所述 DHCP请求向 DHCP服务网元 获取为所述 UE分配的 IP地址, 通过所述通信单元获取控制设备根 据所述 UE的用户特征信息和为所述 UE分配的 IP地址下发的第一 指示信息, 具体包括:
所述处理器, 用于 通过所述通信单元向所述控制设备发送所述 DHCP请求和所述 UE的用户特征信息; 其中, 所述控制设备集成 DHCP服务;
通过所述通信单元接收所述控制设备发送的为所述 UE 分配的 IP地址和所述第一指示信息。
在第三种可能的实现方式中, 结合第一方面或者第一种可能的 实现方式, 所述处理器用于根据所述 DHCP请求向 DHCP服务网元 获取为所述 UE分配的 IP地址, 具体包括:
所述处理器, 用于:
通过所述通信单元向动态主机配置协议 DHCP服务器发送所述 DHCP请求;
通过所述通信单元接收所述 DHCP服务器为所述 UE分配的 IP 地址;
所述处理器用于获取控制设备根据所述 UE 的用户特征信息和 为所述 UE分配的 IP地址下发的第一指示信息, 具体包括:
所述处理器用于通过所述通信单元发送为所述 UE分配的 IP地 址和所述 UE的用户特征信息至所述控制设备,通过所述通信单元接 收所述控制设备根据所述为 UE分配的 IP地址和所述 UE的用户特 征信息下发的第一指示信息。
在第四种可能的实现方式中, 结合第三种可能的实现方式, 所述处理器还用于:
通过所述通信单元发送所述 DHCP请求至所述控制设备; 通过所述通信单元接收所述控制设备发送的第二指示信息, 所 述第二指示信息用于指示当收到所述 DHCP请求时, 转发所述 DHCP 请求至所述 DHCP服务器;
所述处理器用于通过所述通信单元向所述 DHCP服务器发送获 取所述 DHCP请求, 具体包括:
所述处理器用于根据所述第二指示信息通过所述通信单元向所 述 DHCP服务器发送所述获取所述 DHCP请求。
第二方面, 本发明实施例提供了一种控制设备, 应用于控制面 与转发面分离的系统, 包括: 通信单元, 用于与外部网元进行通信;
处理器, 用于: 获取用户设备 UE的用户特征信息和为所述 UE分配的 IP地址; 通过所述通信单元发送第一指示信息至转发设备, 所述第一指 示信息用于指示所述转发设备当收到目的地址为所述 IP 地址的报文 时, 根据所述用户特征信息, 发送所述报文至所述 UE , 其中, 所述 转发设备由所述控制设备进行控制。
在第一种可能的实现方式中, 结合第二方面, 所述处理器用于 获取 UE的用户特征信息和为所述 UE分配的 IP地址, 具体包括: 所述处理器用于:
通过所述通信单元接收所述转发设备发送的所述 UE 的 DHCP 请求和所述 UE 的用户特征信息; 其中, 所述控制设备集成 DHCP 服务;
为所述 UE分配所述 IP地址;
根据所述 UE的用户特征信息和为所述 UE分配的 IP地址通过所述通 信单元下发为所述 UE分配的 IP地址和第一指示信息至所述转发设备。
在第二种可能的实现方式中, 结合第二方面, 所述处理器用于 获取 UE的用户特征信息和为所述 UE分配的 IP地址, 具体包括: 所述处理器用于通过所述通信单元接收所述转发设备发送的为 所述 UE分配的 IP地址和所述 UE的用户特征信息, 并根据为所述 UE分配的 IP地址和所述 UE的用户特征信息通过所述通信单元下发 所述第一指示信息给所述转发设备。
在第三种可能的实现方式中, 结合第二种可能的实现方式 所述处理器还用于:
通过所述通信单元接收所述转发设备发送的所述 UE 的 DHCP 请求;
通过所述通信单元发送第二指示信息至所述转发设备, 所述第 二指示信息用于指示所述转发设备当收到所述 DHCP请求时, 转发 所述 DHCP请求至所述 DHCP服务器。
第三方面, 本发明实施例提供了一种地址分配方法, 应用于控 制面与转发面分离的系统, 包括:
转发设备接受外部网元发送的地址请求, 其中, 所述地址请求 包括用户设备 UE的 DHCP请求和所述 UE的用户特征信息; 所述转发设备根据所述 DHCP请求向 DHCP服务网元获取为所 述 UE分配的 IP地址; 所述转发设备获取控制设备根据所述 UE 的用户特征信息和为 所述 UE分配的 IP地址下发的第一指示信息, 所述第一指示信息用 于指示当收到目的地址为所述 IP地址的报文时, 根据所述用户特征 信息, 发送所述报文至所述 UE; 所述转发设备根据所述用户特征信息发送所述 IP 地址至所述
UE。
在第一种可能的实现方式中, 结合第三方面, 所述转发设备根 据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地址, 具体包括:
所述转发设备发送所述 DHCP请求至所述 DHCP服务网元, 并 接收所述 DHCP服务网元发送的 DHCP请求响应, 其中所述 DHCP 请求响应包括为所述 UE分配的 IP地址, 所述 DHCP请求响应的目 的地址为所述为 UE分配的 IP地址; 所述转发设备根据所述用户特征信息发送所述 IP 地址至所述 UE , 具体包括: 所述转发设备根据所述第一指示信息, 发送所述 DHCP请求响 应至所述 UE。
在第二种可能的实现方式中, 结合第三方面或者第一种可能的 实现方式, 所述转发设备根据所述 DHCP请求向 DHCP服务网元获 取为所述 UE分配的 IP地址; 所述转发设备获取控制设备根据所述 UE 的用户特征信息和为所述 UE分配的 IP地址下发的第一指示信 息, 具体包括: 所述转发设备向所述控制设备发送所述 DHCP 请求和所述 UE 的用户特征信息; 其中, 所述控制设备集成 DHCP服务; 所述转发设备接收所述控制设备发送的为所述 UE分配的 IP地 址和所述第一指示信息。
在第三种可能的实现方式中, 结合第三方面或者第一种可能的 实现方式, 所述转发设备根据所述 DHCP请求向 DHCP服务网元获 取为所述 UE分配的 IP地址, 具体包括: 所述转发设备向 DHCP服务器发送所述 DHCP请求;
所述转发设备接收所述 DHCP服务器为所述 UE分配的 IP地址; 所述转发设备获取控制设备根据所述 UE 的用户特征信息和为 所述 UE分配的 IP地址下发的第一指示信息, 具体包括: 所述转发设备发送为所述 UE分配的 IP地址和所述 UE的用户 特征信息至所述控制设备, 并接收所述控制设备根据所述为 UE 分 配的 IP地址和所述 UE的用户特征信息下发的第一指示信息。 在第四种可能的实现方式中, 结合第三种可能的实现方式, 所 述转发设备向 DHCP服务器发送所述 DHCP请求, 具体包括: 所述转发设备发送所述 DHCP请求至所述控制设备;
所述转发设备接收所述控制设备发送的第二指示信息, 所述第 二指示信息用于指示当收到所述 DHCP请求时, 转发所述 DHCP请 求至所述 DHCP服务器; 所述转发设备向所述 DHCP服务器发送所述 DHCP请求, 具体 包括:
所述转发设备根据所述第二指示信息通过所述通信单元向所述 DHCP服务器发送所述 DHCP请求。
第四方面, 本发明实施例提供了一种地址分配方法, 应用于控 制面与转发面分离的系统, 包括:
控制设备获取用户设备 UE的用户特征信息和为所述 UE分配的 IP地址; 所述控制设备发送第一指示信息至转发设备, 所述第一指示信 息用于指示所述转发设备当收到目 的地址为所述 IP地址的报文时, 根据所述用户特征信息, 发送所述报文至所述 UE , 其中, 所述转发 设备由所述控制设备进行控制。
在第一种可能的实现方式中, 结合第四方面, 所述控制设备获 取用户设备 UE的用户特征信息和为所述 UE分配的 IP地址, 具体 包括:
所述控制设备接收所述转发设备发送的所述 UE 的 DHCP请求 和所述 UE的用户特征信息; 其中, 所述控制设备集成 DHCP服务; 所述控制设备为所述 UE分配 IP地址;
所述控制设备根据所述 UE的用户特征信息和为所述 UE分配的 IP地址下发为所述 UE分配的 IP地址和第一指示信息至所述转发设 备。
在第二种可能的实现方式中, 结合第二方面, 所述控制设备获 取用户设备 UE的用户特征信息和为所述 UE分配的 IP地址, 具体 包括:
所述控制设备接收所述转发设备发送的为所述 UE分配的 IP地 址和所述 UE的用户特征信息, 并根据为所述 UE分配的 IP地址和 所述 U E的用户特征信息下发所述第一指示信息给所述转发设备。
在第三种可能的实现方式中, 结合第二种可能的实现方式, 所述控制设备接收所述转发设备发送的所述 IP 地址和所述用 户特性信息, 具体包括:
所述控制设备接收所述转发设备发送的所述 U E的 D H C P请求; 所述控制设备发送第二指示信息至所述转发设备, 所述第二指 示信息用于指示所述转发设备当收到所述 DHCP请求时, 转发所述 DHCP请求至所述 DHCP服务器。 第五方面, 提供一种转发设备, 应用于控制面与转发面分离的 系统, 包括:
接收单元, 用于接受外部网元发送的地址请求, 其中, 所述地 址请求包括用户设备 UE的 DHCP请求和所述 UE的用户特征信息; 获取单元, 用于根据所述 DHCP请求向 DHCP服务网元获取为 所述 UE分配的 IP地址; 所述获取单元还用于, 获取控制设备根据所述 UE 的用户特征 信息和为所述 UE分配的 IP地址下发的第一指示信息, 所述第一指 示信息用于指示当收到目 的地址为所述 IP地址的报文时, 根据所述 用户特征信息, 发送所述报文至所述 UE; 发送单元, 用于根据所述用户特征信息发送所述 IP地址至所述
UE。 在第一种可能的实现方式中, 结合第五方面, 所述获取单元具 体用于, 发送所述 DHCP请求至所述 DHCP服务网元, 并接收所述 DHCP服务网元发送的 DHCP请求响应, 其中所述 DHCP请求响应 包括为所述 UE分配的 IP地址, 所述 DHCP请求响应的目 的地址为 所述为 UE分配的 IP地址; 所述发送单元具体用于, 根据所述第一指示信息, 发送所述 DHCP 请求响应至所述 UE。
在第二种可能的实现方式中, 结合第五方面或者第一种可能的 实现方式, 所述获取单元包括, 第一发送子单元, 用于向所述控制设备发送所述 DHCP请求和 所述 UE的用户特征信息; 其中, 所述控制设备集成 DHCP服务; 第一接收子单元, 用于接收所述控制设备发送的为所述 UE 分 配的 IP地址和所述第一指示信息。
在第三种可能的实现方式中, 结合第五方面或者第一种可能的 实现方式, 所述获取单元包括:
第二发送子单元, 用于向 DHCP服务器发送所述 DHCP请求; 第二接收子单元, 用于接收所述 DHCP服务器为所述 UE分配 的 IP地址;
所述第二发送子单元还用于, 发送为所述 UE分配的 IP地址和 所述 UE 的用户特征信息至所述控制设备, 以使得所述控制设备根 据所述 IP地址和所述用户特征信息下发所述第一指示信息给所述转 发设备;
所述第二接收子单元还用于,接收所述控制设备根据所述为 UE 分配的 IP地址和所述 UE的用户特征信息下发的第一指示信息。
在第四种可能的实现方式中, 结合第三种可能的实现方式, 所述发送单元还用于, 发送所述 DHCP请求至所述控制设备; 所述接收单元还用于,接收所述控制设备发送的第二指示信息, 所述第二指示信息用于指示当收到所述 DHCP 请求时, 转发所述 DHCP请求至所述 DHCP服务器; 所述发送单元具体还用于, 根据所述第二指示信息向所述 DHCP服务器发送所述 DHCP请求。
第六方面, 提供了一种控制设备, 应用于控制面与转发面分离 的系统, 包括:
获取单元, 用于获取 UE 的用户特征信息和为所述 UE 分配的 IP地址; 发送单元, 用于发送第一指示信息至转发设备, 所述第一指示 信息用于指示所述转发设备当收到 目 的地址为所述 IP 地址的报文 时, 根据所述用户特征信息, 发送所述报文至所述 UE , 其中, 所述 转发设备由所述控制设备进行控制。
在第一种可能的实现方式中, 结合第六方面, 所述获取单元还 包括:
第一接收子单元, 用于接收所述转发设备发送的所述 UE 的 DHCP 请求和所述 UE 的用户特征信息; 其中, 所述控制设备集成 DHCP月良务;
分配子单元, 用于为所述 UE分配 IP地址; 下发子单元, 用于根据所述 UE 的用户特征信息和为所述 UE 分配的 IP地址下发为所述 UE分配的 IP地址和第一指示信息至所述 转发设备。
在第二种可能的实现方式中, 结合第六方面, 所述获取单元还 包括:
第二接收子单元, 用于接收所述转发设备发送的为所述 UE 分 配的 IP地址和所述 UE的用户特征信息, 并根据为所述 UE分配的 IP 地址和所述 UE 的用户特征信息下发所述第一指示信息给所述转 发设备。
在第三种可能的实现方式中, 结合第二种可能的实现方式 所述第二接收子单元还包括: 接收模块, 用于接收所述转发设备发送的所述 UE 的 DHCP请 求;
发送模块, 用于发送第二指示信息至所述转发设备, 所述第二 指示信息用于指示所述转发设备当收到所述 DHCP请求时, 转发所 述 DHCP请求至所述 DHCP服务器。
第七方面, 本发明实施例提供了一种控制面与转发面分离的系 统, 包含第一方面任一项所述的转发设备以及第二方面任一项所述 的控制设备, 或者包含第五方面任一项所述的转发设备以及第六方 面任一项所述的控制设备。 本发明实施例提供了一种 IP地址分配的系统和方法,在控制设 备与转发设备分离的情况下, 实现了用户通过 DHCP方式获取 IP地 址的功能, 与现有技术相比, 解决了 SDN 的 SAE 网络架构下用户 无法通过 DHCP方式获取地址的缺点。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下 面将对实施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于 本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以 根据这些附图获得其他的附图。
图 1 为引入 SDN的 SAE/LTE的网络架构图; 图 2为本发明实施例提供的一种地址分配方法的流程示意图; 图 3 为本发明实施例提供的另一种地址分配方法的流程示意 图;
图 4为一种地址分配方法的详细实施例的流程示意图; 图 5为一种地址分配方法的另一个详细实施例的流程示意图; 图 6为另一种地址分配方法的详细实施例的流程示意图; 图 7 为另一种地址分配方法的另一个详细实施例的流程示意 图;
图 8为本发明实施例提供的一种转发设备的结构示意图; 图 9为本发明实施例提供的另一种转发设备的结构示意图; 图 10为本发明实施例提供的一种控制设备的结构示意图; 图 1 1 为本发明实施例提供的另一种控制设备的结构示意图; 图 12为本发明实施例提供的一种转发设备的装置示意图; 图 13为本发明实施例提供的一种控制设备的装置示意图; 图 14为本发明实施例提供的一种 IP地址分配的系统示意图。 具体实施方式 下面将结合本发明实施例中的附图, 对本发明实施例中的技术 方案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明 一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本 领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他 实施例, 都属于本发明保护的范围。 本发明实施例所提供的方法可以应用于各种通信系统, 例如, 全求移动通讯系统 ( Global System of Mobile communication , 简称 GSM ) 网络、 通用分组无线服务技术( General Packet Radio Service , 简称 GPRS ) 网络、 宽带码分多址( Wideband Code Division Multiple Access , 简称 WCDMA ) 网络、 CDMA-2000 网络、 时分同步码分多 址 ( Time Division- Synchronous Code Division Multiple Access , 简称 TD-SCDMA ) 网络或全球微波互联接入 ( Worldwide Interoperability for Microwave Access , 简称 WiMAX)网络等。 在本发明中,将以系统架构演进( System Architecture Evolution , 简称 SAE ) /长期演进 ( Long-Term Evolution , 简称 LTE ) 网络为例 进行说明, 当然本发明并不只限于应用在这个场景。
示例性的 , SAE/LTE 网络可以包括接入网和核心网两部分, 其 中, 接入网包括 UE和演进型基站 eNodeB , eNodeB用于向 UE提供 空中接口, 以便 UE接入 SAE/LTE 网络, 在本发明实施例中, 接入 网包括的设备对技术的改进没有贡献, 故接入网包括的设备统一称 之为用户侧。 核心网的关键逻辑网元包括移动管理实体 ( Mobility Management Entity , 简称 MME )、 月良务网关 ( Server Gateway , 简 称 S-GW ) 和分组数据网关 ( Packet Data Network Gateway , 简称 P-GW )。 MME 用于负责 SAE/LTE 网络的核心网控制功能, 执行用 户设备的移动管理和会话管理。 S-GW和 P-GW则可以用于向用户侧 提供数据传输服务。 将 SDN引入上述的 SAE/LTE网络架构之后, 核 心网网元的控制功能与转发功能进行了分离, 我们可以得到如图 1 所示的基于 SDN的 SAE/LTE网络架构, 其中, 控制设备实现了核心 网网元的控制面功能, 包括 S-GW 与 P-GW 的网关控制功能以及 MME , 可以根据 OpenFlow 协议对转发设备进行配置和管理, 转发 设备实现了核心网网元的转发面功能, 包括 S-GW与 P-GW的网关 转发功能, 可以根据控制设备对其的配置与管理实现对数据报文的 处理。 参见图 2 , 为本发明实施例提供的一种地址分配方法, 应用于控 制面与转发面分离的系统, 包括;
201 : 转发设备接受外部网元发送的地址请求, 其中, 地址请求 包括用户设备 UE的 DHCP请求和 UE的用户特征信息;
202 : 转发设备根据 DHCP请求向 DHCP服务网元获取为 UE分 配的 IP地址;
203 : 转发设备获取控制设备根据 UE 的用户特征信息和为 UE 分配的 IP地址下发的第一指示信息, 第一指示信息用于指示当收到 目的地址为 IP地址的报文时, 根据用户特征信息, 发送报文至 UE , 其中, 控制设备是对转发设备进行控制的设备;
204 : 转发设备根据用户特征信息发送 IP地址至 UE。
示例性的, 转发设备根据 DHCP请求向 DHCP服务网元获取为 UE分配的 IP地址, 具体包括: 转发设备发送 DHCP请求至 DHCP服务网元, 并接收 DHCP服 务网元发送的 DHCP请求响应, 其中 DHCP请求响应包括为 UE分 配的 IP地址 , DHCP请求响应的目的地址为为 UE分配的 IP地址; 转发设备根据用户特征信息发送 IP地址至 UE , 具体包括: 转发设备根据第一指示信息, 发送 DHCP请求响应至 UE。 可选的,转发设备根据 DHCP请求向 DHCP服务网元获取为 UE 分配的 IP地址; 转发设备获取控制设备根据 UE的用户特征信息和 为 UE分配的 IP地址下发的第一指示信息, 具体包括: 转发设备向控制设备发送 DHCP请求和 UE 的用户特征信息; 其中, 控制设备集成 DHCP服务;
转发设备接收控制设备发送的为 UE分配的 IP地址和第一指示 信息。
可选的,转发设备根据 DHCP请求向 DHCP服务网元获取为 UE 分配的 IP地址, 具体包括: 转发设备向 DHCP服务器发送 DHCP请求; 转发设备接收 DHCP服务器为 UE分配的 IP地址;
转发设备获取控制设备根据 UE的用户特征信息和为 UE分配的 IP地址下发的第一指示信息, 具体包括: 转发设备发送为 UE分配的 IP地址和 UE的用户特征信息至控 制设备, 并接收控制设备根据为 UE分配的 IP地址和 UE的用户特 征信息下发的第一指示信息。 进一步的, 转发设备向 DHCP服务器 发送 DHCP请求, 具体包括: 转发设备发送 DHCP请求至控制设备;
转发设备接收控制设备发送的第二指示信息, 第二指示信息用 于指示当收到 DHCP请求时, 转发 DHCP请求至 DHCP服务器; 转发设备向 DHCP服务器发送 DHCP请求, 具体包括: 转发设备根据第二指示信息通过通信单元向 DHCP服务器发送 DHCP请求。
本实施例提供一种 IP地址分配的方法, 实现了在控制面与转发 面分离的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP方式获取地址的缺点。
参见图 3 , 为本发明实施例提供的另一种地址分配的方法, 应用 于控制面与转发面分离的系统, 包括:
301 : 控制设备获取用户设备 UE 的用户特征信息和为 UE分配 的 IP地址; 示例性的, 控制设备获取用户设备 UE的用户特征信息和为 UE 分配的 IP地址, 具体可以包括: 控制设备接收转发设备发送的 UE的 DHCP请求和 UE的用户特 征信息; 其中, 控制设备集成 DHCP服务;
控制设备为 UE分配 IP地址;
控制设备根据 UE 的用户特征信息和为 UE分配的 IP地址下发 为 UE分配的 IP地址和第一指示信息至转发设备; 或者,
控制设备接收转发设备发送的为 UE分配的 IP地址和 UE的用 户特征信息, 并根据为 UE分配的 IP地址和 UE的用户特征信息下 发第一指示信息给转发设备。 进一步的, 具体还可以包括:
控制设备接收转发设备发送的 UE的 DHCP请求;
控制设备发送第二指示信息至转发设备, 第二指示信息用于指 示转发设备当收到 DHCP请求时,转发 DHCP请求至 DHCP服务器。
302 : 控制设备发送第一指示信息至转发设备, 第一指示信息用 于指示转发设备当收到目 的地址为 IP地址的报文时, 根据用户特征 信息, 发送报文至 UE , 其中, 转发设备由控制设备进行控制。
本实施例提供一种 IP地址分配的方法, 实现了在控制面与转发 面分离的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP方式获取地址的缺点。
在图 2和图 3 实施例的基础上, 参见图 4 , 提供了一种地址分配 方法的详细实施例, 本实施例的特征在于, 控制设备集成 DHCP月良 务, 可以是由控制设备完成 DHCP地址分配功能或者 DHCP地址分 配设备直接与控制设备连接, 具体步骤如下:
401 : 外部网元向转发设备发送地址请求; 示例性的 ,地址请求包括 UE的 DHCP请求和该 UE的用户特征 信息,具体的,本发明实施例中,UE将 DHCP请求报文发送至 eNodeB 之后, 由 eNodeB将该 UE的用户特征信息与 DHCP请求报文封装成 GPRS隧道协议 ( GPRS Tunneling Protocol , 简称 GTP ) 才艮文得到地 址请求。 其中, 用户特征信息用来标识用户特征, 可选的包括但不 限于隧道端点标识符( Tunnel Ending Identifier, 简称 TEID )信息或 者媒体接入控制 ( Media Access Control , 简称 MAC ) 地址。 示例性 的, 本发明的实施例选择 TEID信息作为用户特征信息。 402 : 转发设备向控制设备发送地址请求;
示例性的, 转发设备接收到地址请求后, 由于没有预先安装与 地址请求相关的上行流表, 使得转发设备无法根据地址请求找到对 应的流表进行匹配, 也就使得无法对地址请求进行处理, 此时转发 设备可以将收到的并且无法进行流表匹配的报文均发往控制设备, 通过这种方式将地址请求发送至控制设备;
进一步的, 参见表 1 , 流表可以包括匹配域字段、 计数器和指令 集, 其中匹配域字段是个十元组, 是报文匹配的输入关键字, 可以 匹配从以太层到传输层的五层数据包头中 36 种用于头域匹配的字 段; 计数器用来计数流表项的统计数据; 指令集标明了与该流表项 匹配的数据包应该执行的操作, 最基本的操作行为包括转发给某个 端口、 封装改写报文后转发以及丟弃。
若进入转发设备的报文中有与流表中 匹配域字段相匹配的字 段, 则转发设备根据该流表中的指令集对报文进行操作; 若进入转 发设备的报文中没有与流表中匹配域字段相匹配的字段, 则转发设 备可以将报文发送至控制设备。 流表本身的生成、 维护、 下发完全 由控制设备来实现。
表 1
流表 匹配域 计数 指令
优选的, 当转发设备与控制设备之间采用 OpenFlow协议, 转发 设备可以采用 Packet-in消息来向控制设备发送地址请求。
403 : 控制设备根据接收到的地址请求获取 UE的用户特征信息 并且为 UE分配的 IP地址; 示例性的, 控制设备接收到转发设备发送的 Packet-in消息后, 对该消息进行 GTP解封装, 得到 UE的用户特征信息和 DHCP请求 报文, 控制设备将 DHCP 请求报文交给控制设备本身包含的 DHCP 模块进行处理, 以使得 DHCP模块根据 DHCP请求报文为 UE分配 IP地址, 并将为 UE分配的 IP地址封装在 DHCP请求响应中。 与此 同时, 控制设备还对 IP地址和与用户特征信息之间的关系进行了维 护, 具体来说, 控制设备可以通过映射表的形式来维护 IP地址与用 户特征信息之间对应的关系。
404 :控制设备将为 UE分配的 IP地址以及第一指示信息发送至 转发设备;
示例性的, 控制设备将包含为 UE分配的 IP地址的 DHCP请求 响应和第一指示信息发送至转发设备, 其中, 第一指示信息用来指 示转发设备收到目的地址为为 UE分配的 IP地址的报文后, 根据用 户特征信息, 发送报文至 UE。 具体的, 第一指示信息可以包括采用 为 UE分配的 IP地址进行匹配的下行流表, 以使得转发设备能够将 下行 ^艮文发送至使用为 UE分配的 IP地址的用户, 本发明实施例中 的 DHCP请求响应就属于一种下行 4艮文。 需要提到的是, 控制设备还可以向转发设备发送上行流表, 上 行流表根据用户特征信息进行匹配, 由于为 UE分配的 IP地址与用 户特征信息之间是对应的关系, 上行流表能够使得转发设备根据用 户特征信息将使用为 UE分配的 IP地址的 UE发送的上行报文进行 处理。
405 : 转发设备根据第一指示信息发送为 UE 分配的 IP 地址至
UE;
示例性的, 第一指示信息包括采用为 UE分配的 IP地址进行匹 配的下行流表, 转发设备可以根据下行流表将 DHCP请求响应与用 户特征信息一同封装成 GTP报文并发送至 eNodeB , 最后由 eNodeB 将 GTP报文解封装后, 根据用户特征信息将 DHCP请求响应发送给 UE , 使得 UE获取 DHCP请求响应中的为 UE分配的 IP地址, 完成 对 UE的 IP地址分配, 并且 UE后续就可以使用为 UE分配的 IP地 址进行通信了。
本实施例提供一种 IP地址分配的方法, 实现了在控制面与转发 面分离的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP方式获取地址的缺点。 在图 2和图 3 实施例的基础上, 参见图 5 , 提供了一种地址分配 方法的另一个详细实施例, 本实施例的特征与图 4 所示的实施例同 样在于, 控制设备集成 DHCP 服务, 可以是由控制设备完成 DHCP 地址分配功能或者 DHCP 地址分配设备直接与控制设备连接, 优选 的, 本实施例选择 DHCP 地址分配功能由控制设备完成, 具体步骤 如下:
501 : 控制设备向转发设备发送上行流表;
示例性的, 本实施例中, UE发送的地址请求都属于上行报文, 因此, 控制设备可以预先向转发设备发送上行流表, 以使得转发设 备能够根据上行流表对上行报文进行相应的处理。 本实施例中, 上 行流表可以包括转发设备对地址请求的 GTP报文进行解封装, 若发 现是 DHCP请求报文, 则将 DHCP请求报文与地址请求 GTP报文中 的 TEID信息一并发送至控制设备。
502 : 外部网元向转发设备发送地址请求;
示例性的, 本实施例与图 4 所述的实施例类似, 地址请求是通 过 eNodeB将 UE的用户特征信息与 DHCP请求报文封装成 GTP报 文得到的。其中,用户特征信息用来标识用户特征,可选的包括 TEID 信息或者 MAC地址。 示例性的, 本发明的实施例选择 TEID信息作 为用户特征信息。
503 : 转发设备向控制设备发送地址请求;
示例性的, 转发设备接收到地址请求后, 根据步骤 501 中接收 到的上行流表对地址请求的 GTP报文进行解封装, 发现是 DHCP请 求报文, 则将 DHCP请求报文与地址请求 GTP报文中的 TEID信息 一并发送至控制设备。
504 : 控制设备为 UE分配的 IP地址; 示例性的, 控制设备本身包含的 DHCP模块可以根据接收到的 DHCP请求报文为 UE侧分配对应的 IP地址, , 封装在 DHCP请求响 应中, 并且控制设备可以通过映射表的形式将为 UE分配的 IP地址 与 TEID信息进行 对应。
505 :控制设备将为 UE分配的 IP地址以及第一指示信息发送至 转发设备;
示例性的, 控制设备将为 UE分配的 IP地址以及第一指示信息 发送至转发设备, 其中, 为 UE分配的 IP地址可以包含在 DHCP请 求响应中。 第一指示信息用来指示转发设备收到目 的地址为为 UE 分配的 IP地址的报文后, 根据用户特征信息, 发送报文至 UE ,
具体可以通过如图 4所述实施例中的步骤 404中的采用 IP地址 进行匹配的下行流表来表示第一指示信息; 或者还可以通过控制设备将 DHCP 请求响应封装成地址响应 GTP报文并发送至转发设备, 其中报文头包含 UE侧的 TEID作为第 一指示信息。 本实施例选择后者所述的方式作为第一指示信息。
506 : 转发设备根据第一指示信息发送为 UE 分配的 IP 地址至 UE侧;
示例性的,转发设备接收到控制设备发送的地址响应 GTP报文, 则转发设备将此 GTP报文进行解封获得其中的 DHCP请求响应, 并 且根据地址响应 GTP报文头中包含的 TEID信息将 DHCP请求响应 直接发送至与 TEID信息对应的 UE侧, 以使得 UE侧获取到为 UE 分配的 IP地址。 本实施例提供一种 IP地址分配的方法, 实现了在控制面与转发 面分离的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP方式获取地址的缺点。
在图 2和图 3 实施例的基础上, 参见图 6 , 提供了另一种地址分 配方法的详细实施例, 本实施例具体特征在于, DHCP 地址分配功 能由核心网外部的 DHCP服务器提供, 具体实现步骤如下:
601 : 外部网元向转发设备发送地址请求;
示例性的, 与图 4、 图 5 实施例类似, 地址请求包括用户特征信 息, 具体的, 外部网元发送的地址请求是 eNodeB将 UE的 DHCP请 求报文并携带 UE的用户特征信息封装成 GTP报文得到的。 其中 , 用户特征信息用来标识用户特征, 可选的有 TEID信息或者 MAC地 址。 优选的, 本实施例选择 TEID信息作为用户特征信息。
602 : 转发设备向控制设备发送地址请求;
示例性的, 由于转发设备没有预先安装与地址请求相关的上行 流表, 使得转发设备无法根据地址请求找到对应的流表进行匹配, 也就使得无法对地址请求进行处理, 此时转发设备可以将收到的并 且无法进行流表匹配的报文均发往控制设备, 通过这种方式将地址 请求发送至控制设备。
603 : 控制设备根据接收到的地址请求获取 UE的用户特征信息 并且发送第二指示信息至转发设备;
示例性的, 第二指示信息具体的可以是控制设备向转发设备发 送的上行流表, 以使得转发设备能够根据上行流表对地址请求进行 处理。
具体的, 控制设备接收到转发设备发送的地址请求之后, 根据 地址请求中的 DHCP请求报文建立上行流表, 以使得转发设备能够 根据上行流表将 DHCP请求报文发送至 DHCP服务器。
604 : 转发设备根据第二指示信息将地址请求发送至 DHCP服务 器;
示例性的, 本实施例中, 转发设备可以根据作为第二指示信息 的上行流表将地址请求 GTP报文进行解封, 并将 DHCP请求报文发 送至 DHCP服务器。
605 : DHCP服务器发送为 UE分配的 IP地址至转发设备; 示例性的, DHCP月良务器在收到 DHCP请求才艮文后, 为 UE侧分 配对应的 IP地址,, DHCP服务器将为 UE分配的 IP地址封装在 DHCP 请求响应中, 并发送至转发设备。
606 :转发设备向控制设备发送为 UE分配的 IP地址和用户特征 信息; 示例性的, 由于没有相应的下行流表, 与步骤 602 类似, 转发 设备将接收到的无法进行流表匹配 DHCP请求响应发送至控制设备 进行处理,为了能够让控制设备能够识别分配 IP地址的 UE侧信息, 转发设备将 DHCP请求响应连同对应的用户特征信息一并发送至控 制设备, 以使得控制设备根据为 UE分配的 IP地址和用户特征信息 下发第一指示信息给转发设备。
607 :控制设备将为 UE分配的 IP地址以及第一指示信息发送至 转发设备; 示例性的, 控制设备将接收到的 DHCP请求响应中的为 UE 分 配的 IP地址与用户特征信息通过映射表的形式进行 对应, 生成 第一指示信息, 其中, 第一指示信息用来指示转发设备收到目 的地 址为为 UE分配的 IP地址的报文后, 根据用户特征信息, 发送报文 至 UE。 具体的, 第一指示信息可以包括采用为 UE分配的 IP地址进行 匹配的下行流表, 以使得转发设备能够将下行报文发送至使用为 UE 分配的 IP地址的用户, 本发明实施例中的 DHCP请求响应就属于一 种下行报文。
608 : 转发设备根据第一指示信息发送为 UE 分配的 IP 地址至
UE侧。 示例性的, 类似于步骤 405 , 转发设备可以根据下行流表将 DHCP 请求响应与用户特征信息一同封装成 GTP 报文并发送至 eNodeB , 最后由 eNodeB将 GTP报文解封装后, 根据用户特征信息 将 DHCP请求响应发送给 UE , 使得 UE获取 DHCP请求响应中的为 UE分配的 IP地址, 完成对 UE的 IP地址分配, 并且 UE后续就可 以使用为 UE分配的 IP地址进行通信了。 本实施例提供一种 IP地址分配的方法, 实现了在控制面与转发 面分离的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP方式获取地址的缺点。 在图 2和图 3 实施例的基础上, 参见图 7 , 提供了另一种地址分 配方法的另一个详细实施例, 本实施例的特征与图 6 所示的实施例 同样在于, DHCP地址分配功能由核心网外部的 DHCP服务器提供, 具体步骤如下:
701 : 控制设备预先向转发设备发送第二指示信息;
示例性的, 控制设备预先将第二指示信息发送至转发设备, 其 中第二指示信息包括上行流表, 以使得转发设备能够对用户发送的 上行报文进行处理, 示例性的, UE发送的地址请求就属于一种上行 报文。
702 : 外部网元向转发设备发送地址请求; 示例性的, 与上述的实施例步骤 601 类似, 地址请求包括 UE 的 DHCP请求和 UE 的用户特征信息, 其中, 用户特征信息用来标 识用户特征, 可选的有 TEID信息或者 MAC地址。 优选的, 本实施 例选择 TEID信息作为用户特征信息。
具体的, 外部网元发送的地址请求是 eNodeB将 UE的 DHCP请 求报文并携带 UE的用户特征信息封装成 GTP报文得到的。
703 : 转发设备根据第二指示信息将地址请求发送至 DHCP服务 器;
示例性的, 由于转发设备预先安装了上行流表, 以使得转发设 备能够对接收到的地址请求进行处理, 转发设备可以根据上行流表 将地址请求 GTP报文进行解封, 并将 DHCP请求报文发送至 DHCP 服务器。
704 : DHCP服务器发送为 UE分配的 IP地址至转发设备; 与上述的实施例步骤 605 类似, DHCP服务器在收到 DHCP请 求才艮文后, 为 UE分配对应的 IP地址, DHCP Λ良务器将为 UE分配 的 IP地址封装在 DHCP请求响应中, 并发送至转发设备。
705 :转发设备向控制设备发送为 UE分配的 IP地址和用户特征 信息;
与上述的实施例步骤 606 类似, 由于没有相应的下行流表, 转 发设备将接收到的无法进行流表匹配 DHCP请求响应发送至控制设 备进行处理, 为了能够让控制设备能够识别分配 IP地址的 UE侧信 息, 转发设备将 DHCP请求响应连同对应的用户特征信息一并发送 至控制设备, 以使得控制设备根据为 UE分配的 IP地址和用户特征 信息下发第一指示信息给转发设备。。
706 :控制设备将为 UE分配的 IP地址以及第一指示信息发送至 转发设备;
示例性的, 与上述的实施例步骤 607 类似, 控制设备将接收到 的 DHCP请求响应中的为 UE分配的 IP地址与用户特征信息通过映 射表的形式进行——对应, 生成第一指示信息, 其中, 第一指示信 息用来指示转发设备收到目 的地址为为 UE分配的 IP地址的报文后, 根据用户特征信息, 发送报文至 UE。
具体的, 第一指示信息可以包括采用 IP地址进行匹配的下行流 表, 以使得转发设备能够将下行报文发送至使用为 UE分配的 IP地 址的用户, 本发明实施例中的 DHCP请求响应就属于一种下行报文。
707 : 转发设备根据第一指示信息发送为 UE 分配的 IP 地址至 UE侧; 示例性的, 与上述的实施例步骤 608 类似, 转发设备可以根据 下行流表将 DHCP请求响应与用户特征信息一同封装成 GTP报文并 发送至 eNodeB , 最后由 eNodeB将 GTP报文解封装后, 根据用户特 征信息将 DHCP请求响应发送给 UE , 使得 UE获取 DHCP请求响应 中的为 UE分配的 IP地址, 完成对 UE的 IP地址分配, 并且 UE后 续就可以使用 IP地址进行通信了。
本实施例提供一种 IP地址分配的方法, 实现了在控制面与转发 面分离的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP方式获取地址的缺点。
本发明实施例提供了一种转发设备 80 ,应用于 SDN的控制面与 转发面分离的系统中, 在本发明的实施例中对转发设备的具体形式 不做具体限制, 可以是单独的转发设备, 也可以和控制设备组合在 一起, 如图 8所示, 转发设备 80 包括:
接收单元 801 , 用于接受外部网元发送的地址请求, 其中, 地址 请求包括用户设备 UE的 DHCP请求和 UE的用户特征信息;
获取单元 802 , 用于根据 DHCP请求向 DHCP服务网元获取为 UE分配的 IP地址;
获取单元 802还用于,获取控制设备根据 UE的用户特征信息和 为 UE分配的 IP地址下发的第一指示信息, 第一指示信息用于指示 当收到目 的地址为为 UE分配的 IP地址的 文时, ^^据用户特征信 息, 发送报文至 UE , 其中, 控制设备是对转发设备进行控制的设备; 发送单元 803 , 用于根据用户特征信息发送为 UE分配的 IP地 址至 UE。 示例性的, 在本发明实施例中, UE 将 DHCP 请求报文发送至 eNodeB之后, 由 eNodeB将用户特征信息与 DHCP请求报文封装成 GTP 报文得到地址请求。 其中, 用户特征信息用来标识用户特征, 可选的包括 TEID信息或者 MAC地址。 示例性的, 本发明的实施例 选择 TEID信息作为用户特征信息。 示例性的, 获取单元 802进一步用于,发送 DHCP请求至 DHCP 服务网元, 并接收 DHCP 服务网元发送的 DHCP 请求响应, 其中 DHCP请求响应包括为 UE分配的 IP地址, DHCP请求响应的目 的 地址为 UE分配的 IP地址; 发送单元 803还可以用于, 根据第一指示信息发送 DHCP请求 响应至 UE。 可选的, 第一指示信息可以包括采用 IP地址进行匹配的下行流 表, 发送单元 803 可以根据下行流表将 DHCP请求响应与用户特征 信息一同封装成 GTP报文并发送至 eNodeB ,最后由 eNodeB将 GTP 报文解封装后, 根据用户特征信息将 DHCP请求响应发送给 UE , 使 得 UE获取 DHCP请求响应中的为 UE分配的 IP地址, 完成对 UE 的 IP地址分配; 进一步的, 如表 1 , 流表可以包括匹配域字段、 计数器和指令 集, 其中匹配域字段是个十元组, 是报文匹配的输入关键字, 可以 匹配从以太层到传输层的五层数据包头中 36 种用于头域匹配的字 段; 计数器用来计数流表项的统计数据; 指令集标明了与该流表项 匹配的数据包应该执行的操作。 最基本的操作行为包括转发给某个 端口、 封装改写报文后转发以及丟弃。
若进入转发设备 80的报文中有与流表中匹配域字段相匹配的字 段, 则转发设备 80根据该流表中的指令集对报文进行操作; 若进入 转发设备 80的报文中没有与流表中匹配域字段相匹配的字段, 则转 发设备 80可以将报文发送至控制设备。 流表本身的生成、 维护、 下 发完全由控制设备来实现。 可选的, 第一指示信息还可以是控制设备将 DHCP请求响应封 装成地址响应 GTP ^艮文时包含 UE 的 TEID 的^艮文头, 以使得发送 单元 803根据包含 UE 的 TEID 的报文头将地址响应 GTP报文发送 至对应的 UE。
示例性的, 参见图 9 , 获取单元 802可以包括: 第一发送子单元 8021 , 用于向控制设备发送 DHCP请求和 UE 的用户特征信息; 其中, 控制设备集成 DHCP服务;
第一接收子单元 8022 , 用于接收控制设备发送的为 UE分配的 IP地址和第一指示信息。
具体的, 第一发送子单元 8021 向控制设备发送 DHCP 请求和 UE 的用户特征信息, 可以是转发设备 80接收到地址请求后, 由于 没有预先安装与地址请求相关的上行流表, 使得转发设备 80无法根 据地址请求找到对应的流表进行匹配, 也就使得无法对地址请求进 行处理, 此时转发设备 80可以将收到的并且无法进行流表匹配的报 文均发往控制设备, 通过这种方式将地址请求发送至控制设备; 或者,
第一发送子单元 8021 向控制设备发送 DHCP请求和 UE的用户 特征信息, 也可以是控制设备预先向转发设备 80发送上行流表, 以 使得第一发送子单元 8021能够根据上行流表对上行报文进行相应的 处理。 本实施例中, 上行流表可以包括转发设备 80 对地址请求的 GTP报文进行解封装, 若发现是 DHCP请求报文, 则将 DHCP请求 报文与地址请求 GTP报文中的 TEID信息一并发送至控制设备; 示例性的, 参见图 9 , 获取单元 802也可以包括: 第二发送子单元 8023 , 用于向 DHCP服务器发送 DHCP请求; 第二接收子单元 8024 , 用于接收 DHCP服务器发送的为 UE分 配的 IP地址; 第二发送子单元 8023还用于, 发送为 UE分配的 IP地址和 UE 的用户特征信息至控制设备, 以使得控制设备根据为 UE 分配的 IP 地址和用户特征信息下发第一指示信息给转发设备 80。 进一步的, 在第二发送子单元 8023 向 DHCP 服务器发送获取 UE的地址的请求之前;
发送单元 803还用于, 发送 UE的 DHCP请求至控制设备; 接收单元 801 还用于, 接收控制设备发送的第二指示信息, 其 中第二指示信息用于指示当收到 UE的地址请求时,转发 UE的 DHCP 请求至 DHCP服务器;
具体的, 第二指示信息可以是控制设备向转发设备 80发送的上 行流表,以使得转发设备 80能够根据上行流表对地址请求进行处理。 可选的, 在发送单元 803发送 UE的地址请求至控制设备之后; 接收单元 801 接收控制设备发送的第二指示信息, 本实施例中, 第 二指示信息是控制设备根据地址请求中的 DHCP请求报文建立上行 流表, 以使得转发设备 80能够根据上行流表将 DHCP请求报文发送 至 DHCP月良务器;
可选的, 接收单元 801 也可以预先接收控制设备发送的第二指 示信息, 其中第二指示信息包括上行流表, 以使得转发设备 80能够 对用户发送的上行报文进行处理, 本实施例中, UE发送的地址请求 就属于一种上行报文。
发送单元 803还用于, 根据第二指示信息向 DHCP服务器发送 UE的 DHCP请求; 具体的, 发送单元 803 可以根据第二指示信息中的上行流表将 地址请求 GTP报文进行解封, 并将 DHCP请求报文发送至 DHCP服 务器。
示例性的, 第二发送子单元 8023还用于, 发送为 UE分配的 IP 地址和用户特征信息至控制设备; 具体是由于没有相应的下行流表, 转发设备 80将接收到的无法进行流表匹配 DHCP请求响应发送至控 制设备进行处理, 为了能够让控制设备能够识别分配 IP 地址的 UE 侧信息, 转发设备 80将 DHCP请求响应连同对应的用户特征信息一 并发送至控制设备。 以使得控制设备根据为 UE分配的 IP地址和用 户特征信息生成第一指示信息以使得转发设备 80将为 UE分配的 IP 地址转发至对应的 UE。
本实施例提供一种转发设备 80 , 实现了在控制面与转发面分离 的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有 技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP 方 式获取地址的缺点。
本发明实施例提供了一种控制设备 100 , 应用于 SDN的控制面 与转发面分离的系统中, 在本发明的实施例中对控制设备的具体形 式不做具体限制, 可以是单独的控制设备, 也可以和转发设备组合 在一起, 如图 10所示, 控制设备 100可以包括:
获取单元 1001 , 用于获取 UE 的用户特征信息和为 UE分配的 IP地址; 发送单元 1002 , 用于发送第一指示信息至转发设备, 第一指示 信息用于指示转发设备当收到目的地址为该 IP地址的报文时, 根据 用户特征信息, 发送报文至 UE , 其中, 转发设备由控制设备 100进 行控制。
示例性的, 用户特征信息用来标识用户特征, 可选的包括 TEID 信息或者 MAC地址。 示例性的, 本发明的实施例选择 TEID信息作 为用户特征信息。 示例性的,为 UE分配的 IP地址可以包含在 DHCP请求响应中; 第一指示信息具体的形式可以包括采用 IP 地址进行匹配的下行流 表, 以使得转发设备能够将下行报文发送至使用为 UE分配的 IP地 址的用户; 或者,
控制设备 100将 DHCP请求响应封装成地址响应 GTP 文并发 送至转发设备, 其中报文头包含 UE的 TEID作为第一指示信息。 进一步的,如表 1 , 流表可以包括匹配域字段、计数器和指令集, 其中匹配域字段是个十元组, 是 ^艮文匹配的输入关键字, 可以 匹配 从以太层到传输层的五层数据包头中 36种用于头域匹配的字段; 计 数器用来计数流表项的统计数据; 指令集标明了与该流表项匹配的 数据包应该执行的操作。 最基本的操作行为包括转发给某个端口 、 封装改写报文后转发以及丟弃。 若进入转发设备的报文中有与流表中 匹配域字段相匹配的字 段, 则转发设备根据该流表中的指令集对报文进行操作; 若进入转 发设备的报文中没有与流表中匹配域字段相匹配的字段, 则转发设 备可以将报文发送至控制设备 100。 流表本身的生成、 维护、 下发完 全由控制设备 100来实现。
示例性的, 参见图 1 1 , 获取单元 1001 可以包括:
第一接收子单元 1001 1 , 用于接收转发设备发送的 UE的 DHCP 请求和 UE 的用户特征信息; 其中, 控制设备集成 DHCP服务, 本 实施例中用户特征信息为 TEID ;
分配子单元 10012 , 用于为 UE分配 IP地址。
具体的, 分配子单元 10012为 UE分配 IP地址之后, 控制设备 100可以通过映射表的形式将为 UE分配的 IP地址与 TEID信息进行 一一对应; 下发子单元 10013 , 用于根据 UE的用户特征信息和为 UE分配 的 IP地址下发为 UE分配的 IP地址和第一指示信息至转发设备。 示例性的, 参见图 1 1 , 获取单元 1001还可以包括:
第二接收子单元 10014 , 用于接收转发设备发送的为 UE分配的 IP地址和 UE 的用户特征信息, 并根据为 UE分配的 IP地址和 UE 的用户特征信息下发第一指示信息给转发设备。
具体的, 第二接收子单元 10014可以包括: 接收模块 100141 , 用于接收转发设备发送的 UE的 DHCP请求; 发送模块 100142 , 用于发送第二指示信息至转发设备, 第二指 示信息用于指示转发设备当收到 DHCP请求时, 转发 DHCP请求至 DHCP月良务器。
示例性的, 第二指示信息具体可以是控制设备 100 向转发设备 发送的上行流表, 以使得转发设备能够根据上行流表对地址请求进 行处理, 其中第二指示信息可以预先安装在转发设备中, 也可以是 接收模块 100141接收到转发设备发送的地址请求之后, 根据地址请 求中的 DHCP请求报文建立上行流表作为第二指示信息, 本实施例 对此并不作任何限定。 本实施例提供一种控制设备 100 ,实现了在控制面与转发面分离 的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有 技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP 方 式获取地址的缺点。
本发明实施例提供了一种转发设备 80 ,应用于 SDN的控制面与 转发面分离的系统中, 在本发明的实施例中对控制设备的具体形式 不做具体限制, 以可以实现本发明的实施例所提供的上述任一 IP地 址分配的方法为准, 参见图 12 , 包括: 至少一个通信单元 1201、 处 理器 1202、 存储器 1203和总线 1204 , 该至少一个通信单元 1201、 处理器 1202、存储器 1203通过总线 1204连接并完成相互间的通信。
该总线 1204 可以是工业标准体系结构 ( Industry Standard Architecture , 简 称为 ISA ) 总线 、 外部设备互连 ( Peripheral Component , 简称为 PCI ) 总线或扩展工业标准体系结构 ( Extended Industry Standard Architecture , 简称为 EISA ) 总线等。 该总线 1204 可以分为地址总线、 数据总线、 控制总线等。 为便于表示, 图 12中 仅用一条粗线表示, 但并不表示仅有一根总线或一种类型的总线。 其中:
存储器 1203用于存储可执行程序代码, 该程序代码包括计算机 操作指令。 存储器 1203可能包含高速 RAM存储器, 也可能还包括 非易失性存储器( non- volatile memory ) , 例如至少一个磁盘存储器。 存储设备中存储: 操作系统、 应用程序, 用于实现本发明实施例的 程序代码。 操作系统用于控制和实现处理单元执行的处理功能。 应 用程序包含程序代码, 如字处理软件、 email软件。
处理器 1202可能是一个中央处理器 ( Central Processing Unit , 简称为 CPU ) , 或者是特定集成电路( Application Specific Integrated Circuit , 简称为 ASIC ) , 或者是被配置成实施本发明实施例的一个 或多个集成电路。
通信单元 1201 , 用于与外部网元进行通信;
处理器 1202 , 用于: 通过通信单元 1201接收接受外部网元发送的地址请求, 其中, 地址请求包括用户设备 UE的 DHCP请求和 UE的用户特征信息; 根据 DHCP请求向 DHCP服务网元获取为 UE分配的 IP地址; 通过通信单元 1201获取控制设备根据 UE的用户特征信息和为 UE 分配的 IP 地址下发的第一指示信息, 第一指示信息用于指示当 收到目的地址为为 UE分配的 IP地址的 文时, ^^据用户特征信息, 发送报文至 UE , 其中, 控制设备是对转发设备 80进行控制的设备; 根据用户特征信息通过通信单元 1201发送为 UE分配的 IP地址 至 UE。
示例性的, 在本发明实施例中, UE 将 DHCP 请求报文发送至 eNodeB之后, 由 eNodeB将用户特征信息与 DHCP请求报文封装成 GTP 报文得到地址请求。 其中, 用户特征信息用来标识用户特征, 可选的包括 TEID信息或者 MAC地址。 示例性的, 本发明的实施例 选择 TEID信息作为用户特征信息。
示例性的, 处理器 1202进一步用于, 发送 DHCP请求至 DHCP 服务网元, 并接收 DHCP 服务网元发送的 DHCP 请求响应, 其中 DHCP请求响应包括为 UE分配的 IP地址, DHCP请求响应的目 的 地址为 UE分配的 IP地址; 处理器 1202根据第一指示信息通过通信单元 1201 发送 DHCP 请求响应至 UE。 可选的, 第一指示信息可以包括采用 IP地址进行匹配的下行流 表, 处理器 1202可以根据下行流表将 DHCP请求响应与 TEID —同 封装成 GTP 文并通过通信单元 1201 发送至 eNodeB , 最后由 eNodeB将 GTP报文解封装后,根据 TEID将 DHCP请求响应发送给 UE , 使得 UE获取 DHCP请求响应中的为 UE分配的 IP地址, 完成 对 UE的 IP地址分配; 其中, 如表 1 , 流表可以包括匹配域字段、 计数器和指令集, 其 中匹配域字段是个十元组, 是报文匹配的输入关键字, 可以匹配从 以太层到传输层的五层数据包头中 36种用于头域匹配的字段; 计数 器用来计数流表项的统计数据; 指令集标明了与该流表项匹配的数 据包应该执行的操作。 最基本的操作行为包括转发给某个端口、 封 装改写报文后转发以及丟弃。 若进入转发设备 80的报文中有与流表中匹配域字段相匹配的字 段, 则转发设备 80根据该流表中的指令集对报文进行操作; 若进入 转发设备 80的报文中没有与流表中匹配域字段相匹配的字段, 则转 发设备 80可以将报文发送至控制设备。 流表本身的生成、 维护、 下 发完全由控制设备来实现。 可选的, 第一指示信息还可以是控制设备将 DHCP请求响应封 装成地址响应 GTP ^艮文时包含 UE 的 TEID 的^艮文头, 以使得处理 器 1202 ^^据包含 UE的 TEID的 4艮文头通过通信单元 1201将地址响 应 GTP ^艮文发送至对应的 UE。
示例性的,处理器 1202根据所述 DHCP请求向 DHCP服务网元 获取为所述 UE分配的 IP地址, 可以包括:
处理器 1202 , 用于: 通过通信单元 1201向控制设备发送向控制设备发送 DHCP请求 和 UE的用户特征信息; 其中, 控制设备集成 DHCP服务; 通过通信单元 1201接收控制设备发送的为 UE分配的 IP地址和 第一指示信息。 进一步的, 处理器 1202 通过通信单元 1201 向控制设备发送 DHCP请求和 UE的用户特征信息, 可以是转发设备 80接收到地址 请求后, 由于没有预先安装与地址请求相关的上行流表, 使得转发 设备 80无法根据地址请求找到对应的流表进行匹配, 也就使得无法 对地址请求进行处理, 此时转发设备 80可以将收到的并且无法进行 流表匹配的报文均发往控制设备, 通过这种方式将地址请求发送至 控制设备; 或者,
处理器 1202通过通信单元 1201 向控制设备发送 DHCP请求和 UE 的用户特征信息, 也可以是控制设备预先向转发设备 80发送上 行流表, 以使得处理器 1202能够根据上行流表对上行报文进行相应 的处理。 本实施例中, 上行流表可以包括转发设备 80对地址请求的 GTP报文进行解封装, 若发现是 DHCP请求报文, 则将 DHCP请求 报文与地址请求 GTP报文中的 TEID信息一并发送至控制设备; 示例性的,处理器 1202根据所述 DHCP请求向 DHCP服务网元 获取为所述 UE分配的 IP地址, 也可以包括:
处理器, 用于: 通过通信单元 1201 向 DHCP服务器发送 DHCP请求; 通过通信单元 1201 接收 DHCP服务器发送的为 UE 分配的 IP 地址; 处理器 1202还用于: 通过通信单元 1201发送为 UE分配的 IP地址和 UE的用户特征 信息至控制设备, 以使得控制设备根据为 UE分配的 IP地址和用户 特征信息下发第一指示信息给转发设备 80。
进一步的, 处理器 1202通过通信单元 1201 向 DHCP服务器发 送获取 UE的地址的请求之前;
处理器 1202还用于: 通过通信单元 1201发送 UE的 DHCP请求至控制设备; 通过通信单元 1201接收控制设备发送的第二指示信息, 第二指 示信息用于指示当收到 UE的地址请求时,转发 UE的 DHCP请求至 DHCP月良务器;
具体的, 第二指示信息可以是控制设备向转发设备 80发送的上 行流表,以使得转发设备 80能够根据上行流表对地址请求进行处理。
可选的,处理器 1202在通过通信单元 1201发送 UE的地址请求 至控制设备之后; 可以通过通信单元 1201接收控制设备发送的第二 指示信息, 此时, 第二指示信息是控制设备根据地址请求中的 DHCP 请求报文建立上行流表, 以使得转发设备 80 能够根据上行流表将 DHCP请求报文发送至 DHCP服务器;
可选的, 处理器 1202也可以预先通过通信单元 1201 接收控制 设备发送的第二指示信息, 其中第二指示信息包括上行流表, 以使 得转发设备 80能够对用户发送的上行报文进行处理, 本实施例中, UE发送的地址请求就属于一种上行报文。
示例性的, 处理器 1202可以用于根据第二指示信息通过通信单 元 1201向 DHCP服务器发送 UE的 DHCP请求,具体的,处理器 1202 可以根据第二指示信息中的上行流表将地址请求 GTP 报文进行解 封, 并将 DHCP请求报文发送至 DHCP服务器。
示例性的, 处理器 1202通过通信单元 1201 发送为 UE分配的 IP 地址和用户特征信息至控制设备; 具体的, 由于没有相应的下行 流表, 转发设备 80将接收到的无法进行流表匹配 DHCP请求响应发 送至控制设备进行处理, 为了能够让控制设备能够识别分配 IP地址 的 UE侧信息, 转发设备 80将 DHCP请求响应连同对应的用户特征 信息一并发送至控制设备。 以使得控制设备根据为 UE分配的 IP地 址和 TEID生成第一指示信息以使得转发设备 80将为 UE分配的 IP 地址转发至对应的 UE。
本实施例提供一种转发设备 80 , 实现了在控制面与转发面分离 的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有 技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP 方 式获取地址的缺点。
本发明实施例提供了一种控制设备 100 , 应用于 SDN的控制面 与转发面分离的系统中, 在本发明的实施例中对控制设备 100 的具 体形式不做具体限制, 可以是单独的控制设备, 也可以和转发设备 组合在一起, 如图 13所示, 控制设备 100可以包括:
包括: 至少一个通信单元 1301、 处理器 1302、 存储器 1303 和 总线 1304 , 该至少一个通信单元 1301、 处理器 1302、 存储器 1303 通过总线 1304连接并完成相互间的通信。
该总线 1304 可以是工业标准体系结构 ( Industry Standard Architecture , 简 称为 ISA ) 总线 、 外部设备互连 ( Peripheral Component , 简称为 PCI ) 总线或扩展工业标准体系结构 ( Extended Industry Standard Architecture , 简称为 EISA ) 总线等。 该总线 1204 可以分为地址总线、 数据总线、 控制总线等。 为便于表示, 图 12中 仅用一条粗线表示, 但并不表示仅有一根总线或一种类型的总线。 其中:
存储器 1303用于存储可执行程序代码, 该程序代码包括计算机 操作指令。 存储器 1303可能包含高速 RAM存储器, 也可能还包括 非易失性存储器( non- volatile memory ) , 例如至少一个磁盘存储器。 存储设备中存储: 操作系统、 应用程序, 用于实现本发明实施例的 程序代码。 操作系统用于控制和实现处理单元执行的处理功能。 应 用程序包含程序代码, 如字处理软件、 email软件。
处理器 1302可能是一个中央处理器 ( Central Processing Unit , 简称为 CPU ) , 或者是特定集成电路( Application Specific Integrated Circuit , 简称为 ASIC ) , 或者是被配置成实施本发明实施例的一个 或多个集成电路。
通信单元 1301 , 用于与外部网元进行通信;
处理器 1302 , 用于获取用户设备 UE 的用户特征信息和为 UE 分配的 IP地址; 通过通信单元 1301发送第一指示信息至转发设备, 第一指示信 息用于指示当收到目的地址为该 IP地址的报文时, 根据用户特征信 息, 发送报文至 UE , 其中, 转发设备由控制设备 100进行控制。
示例性的, 用户特征信息用来标识用户特征, 可选的包括 TEID 信息或者 MAC地址。 示例性的, 本发明的实施例选择 TEID信息作 为用户特征信息。 示例性的,为 UE分配的 IP地址可以包含在 DHCP请求响应中; 第一指示信息具体的可以包括采用 IP地址进行匹配的下行流表, 以 使得转发设备能够将下行报文发送至使用为 UE分配的 IP地址的用 户;
或者,
控制设备 100将 DHCP请求响应封装成地址响应 GTP 文并发 送至转发设备, 其中报文头包含 UE侧的 TEID作为第一指示信息。 进一步的,如表 1 , 流表可以包括匹配域字段、计数器和指令集, 其中匹配域字段是个十元组, 是 ^艮文匹配的输入关键字, 可以匹配 从以太层到传输层的五层数据包头中 36种用于头域匹配的字段; 计 数器用来计数流表项的统计数据; 指令集标明了与该流表项匹配的 数据包应该执行的操作。 最基本的操作行为包括转发给某个端口 、 封装改写报文后转发以及丟弃。 若进入转发设备的报文中有与流表中 匹配域字段相匹配的字 段, 则转发设备根据该流表中的指令集对报文进行操作; 若进入转 发设备的报文中没有与流表中匹配域字段相匹配的字段, 则转发设 备可以将报文发送至控制设备 100。 流表本身的生成、 维护、 下发完 全由控制设备 100来实现。
示例性的, 处理器 1302 用于获取 UE 的用户特征信息和为 UE 分配的 IP地址, 具体包括:
处理器 1302用于: 通过通信单元 1301 接收转发设备发送的 UE 的 DHCP 请求和 UE的用户特征信息; 其中, 控制设备集成 DHCP服务, 本实施例中 用户特征信息为 TEID ; 为 UE分配 IP地址; 具体的, 处理器 1302为 UE分配 IP地址 之后, 可以通过映射表的形式将为 UE分配的 IP地址与 TEID信息 进行一一对应;
根据 UE的用户特征信息和为 UE分配的 IP地址下发为 UE分配 的 IP地址和第一指示信息至转发设备。 示例性的, 处理器 1302 用于获取 UE 的用户特征信息和为 UE 分配的 IP地址, 具体包括:
处理器 1302通过通信单元 1301接收转发设备发送的为 UE分配 的 IP 地址和 UE 的用户特征信息, 并根据为 UE 分配的 IP地址和 U E的用户特征信息下发第一指示信息给转发设备。
进一步的, 处理器 1302还用于: 通过通信单元 1301接收转发设备发送的 UE的 DHCP请求; 通过通信单元 1301发送第二指示信息至转发设备, 第二指示信 息用于指示转发设备当收到 DHCP请求时,转发 DHCP请求至 DHCP 服务器。
示例性的, 第二指示信息具体的可以是控制设备 100 向转发设 备发送的上行流表, 以使得转发设备能够根据上行流表对地址请求 进行处理, 其中第二指示信息可以预先安装在转发设备中, 也可以 是处理器 1302通过通信单元 1301 接收到转发设备发送的地址请求 之后, 根据地址请求中的 DHCP请求报文建立上行流表作为第二指 示信息, 本实施例对此并不作任何限定。
本实施例提供一种控制设备 100 ,实现了在控制面与转发面分离 的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与现有 技术相比, 解决了 SDN 的 SAE 网络架构下用户无法通过 DHCP 方 式获取地址的缺点。
本发明实施例提供了一种 IP地址分配系统, 参照图 14 所示, 实现了控制面与转发面分离, 包括转发设备 80和控制设备 100 , 其 中转发设备 80为图 8和图 9所示的任一转发设备, 控制设备 100为 图 10和图 1 1 所示的任一控制设备设备; 或者,
转发设备 80为图 12所示的转发设备, 控制设备 100为图 13所 示的控制设备。
本实施例提供一种 IP地址分配系统, 实现了在控制面与转发面 分离的情况下, 实现了用户通过 DHCP方式获取 IP地址的功能, 与 现有技术相比, 解决了 SDN的 SAE网络架构下用户无法通过 DHCP 方式获取地址的缺点。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统, 装置和方法, 可以通过其它的方式实现。 例如, 以上所描述的装置 实施例仅仅是示意性的, 例如, 所述单元的划分, 仅仅为一种逻辑 功能划分, 实际实现时可以有另外的划分方式, 例如多个单元或组 件可以结合或者可以集成到另一个系统, 或一些特征可以忽略, 或 不执行。 另一点, 所显示或讨论的相互之间的耦合或直接耦合或通 信连接可以是通过一些接口, 装置或单元的间接耦合或通信连接, 可以是电性, 机械或其它的形式。 所述作为分离部件说明的单元可以是或者也可以不是物理上分 开的, 作为单元显示的部件可以是或者也可以不是物理单元, 即可 以位于一个地方, 或者也可以分布到多个网络单元上。 可以根据实 际的需要选择其中的部分或者全部单元来实现本实施例方案的 目 的。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处 理单元中, 也可以是各个单元单独物理包括, 也可以两个或两个以 上单元集成在一个单元中。 上述集成的单元既可以采用硬件的形式 实现, 也可以采用硬件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元, 可以存储在一 个计算机可读取存储介质中。 上述软件功能单元存储在一个存储介 质中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等) 执行本发明各个实施例所述方法的部分 步骤。 而前述的存储介质包括: U 盘、 移动硬盘、 只读存储器 ( Read-Only Memory , 简称 ROM )、随机存取存储器( Random Access Memory , 简称 RAM )、 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术人员应当理解: 其依然可以对前述各实施例所记 载的技术方案进行修改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技术方案的本质脱离本发明各实 施例技术方案的精神和范围。

Claims

权 利 要 求 书
1、 一种转发设备, 应用于控制面与转发面分离的系统, 其特征在于, 包括:
通信单元, 用于与外部网元进行通信;
处理器, 用于:
通过所述通信单元接收外部网元发送的地址请求, 其中, 所述地址请 求包括用户设备 UE的 DHCP请求和所述 UE的用户特征信息;
根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地址; 通过所述通信单元获取控制设备根据所述 UE的用户特征信息和为所 述 UE分配的 IP地址下发的第一指示信息, 所述第一指示信息用于指示当 收到目的地址为所述 IP地址的报文时, 根据所述用户特征信息, 发送所述 才艮文至所述 UE;
根据所述用户特征信息通过所述通信单元发送所述 IP 地址至所述
UE。
2、 根据权利要求 1所述的转发设备, 其特征在于,
所述处理器用于根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地址, 具体包括:
所述处理器用于通过所述通信单元发送所述 DHCP请求至所述 DHCP 服务网元, 通过所述通信单元接收所述 DHCP服务网元发送的 DHCP请求 响应 ,其中所述 DHCP请求响应包括为所述 UE分配的 IP地址 ,所述 DHCP 请求响应的目的地址为所述为 UE分配的 IP地址;
所述处理器用于根据所述用户特征信息通过所述通信单元发送所述 IP地址至所述 UE, 具体包括:
所述处理器用于根据所述第一指示信息, 通过所述通信单元发送所述 DHCP请求响应 IP地址至所述 UE。
3、 根据权利要求 1 或 2所述的转发设备, 其特征在于, 所述处理器 用于根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地址, 通过所述通信单元获取控制设备根据所述 UE的用户特征信息和为所述 UE 分配的 IP地址下发的第一指示信息, 具体包括:
所述处理器, 用于:
通过所述通信单元向所述控制设备发送所述 DHCP请求和所述 UE的 用户特征信息; 其中, 所述控制设备集成 DHCP服务; 通过所述通信单元接收所述控制设备发送的为所述 UE分配的 IP地址 和所述第一指示信息。
4、 根据权利要求 1或 2所述的转发设备, 其特征在于,
所述处理器用于根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地址, 具体包括:
所述处理器, 用于:
通过所述通信单元向动态主机配置协议 DHCP服务器发送所述 DHCP 请求;
通过所述通信单元接收所述 DHCP服务器为所述 UE分配的 IP地址; 所述处理器用于获取控制设备根据所述 UE的用户特征信息和为所述
UE分配的 IP地址下发的第一指示信息, 具体包括:
所述处理器用于通过所述通信单元发送为所述 UE分配的 IP地址和所 述 UE 的用户特征信息至所述控制设备, 通过所述通信单元接收所述控制 设备根据所述为 UE分配的 IP地址和所述 UE的用户特征信息下发的第一 指示信息。
5、 根据权利要求 4所述的转发设备, 其特征在于,
所述处理器还用于:
通过所述通信单元发送所述 DHCP请求至所述控制设备;
通过所述通信单元接收所述控制设备发送的第二指示信息, 所述第二 指示信息用于指示当收到所述 DHCP请求时, 转发所述 DHCP请求至所述
DHCP服务器;
所述处理器用于通过所述通信单元向所述 DHCP 服务器发送所述 DHCP请求, 具体包括:
所述处理器用于根据所述第二指示信息通过所述通信单元向所述 DHCP服务器发送所述 DHCP请求。
6、 一种控制设备, 应用于控制面与转发面分离的系统, 其特征在于, 包括:
通信单元, 用于与外部网元进行通信;
处理器, 用于:
获取用户设备 UE的用户特征信息和为所述 UE分配的 IP地址; 通过所述通信单元发送第一指示信息至转发设备, 所述第一指示信息 用于指示所述转发设备当收到目的地址为所述 IP地址的报文时,根据所述 用户特征信息, 发送所述报文至所述 UE, 其中, 所述转发设备由所述控制 设备进行控制。
7、 根据权利要求 6所述的控制设备, 其特征在于,
所述处理器用于获取 UE的用户特征信息和为所述 UE分配的 I P地址, 具体包括:
所述处理器用于:
通过所述通信单元接收所述转发设备发送的所述 UE的 DHCP请求和 所述 UE的用户特征信息; 其中, 所述控制设备集成 DHCP服务;
为所述 UE分配 IP地址;
根据所述 UE的用户特征信息和为所述 UE分配的 IP地址通过所述通 信单元下发为所述 UE分配的 IP地址和第一指示信息至所述转发设备。
8、 根据权利要求 6所述的控制设备, 其特征在于,
所述处理器用于获取 UE的用户特征信息和为所述 UE分配 IP地址, 具体包括:
所述处理器用于通过所述通信单元接收所述转发设备发送的为所述 UE分配的 IP地址和所述 UE的用户特征信息 IP地址, 并根据为所述 UE 分配的 IP地址和所述 UE的用户特征信息 IP地址通过所述通信单元下发所 述第一指示信息给所述转发设备。
9、 根据权利要求 8所述的控制设备, 其特征在于,
所述处理器还用于:
通过所述通信单元接收所述转发设备发送的所述 UE的 DHCP请求; 通过所述通信单元发送第二指示信息至所述转发设备, 所述第二指示 信息用于指示所述转发设备当收到所述 DHCP请求时, 转发所述 DHCP请 求至所述 DHCP服务器。
10、 一种地址分配方法, 应用于控制面与转发面分离的系统, 其特征 在于, 包括:
转发设备接受外部网元发送的地址请求, 其中, 所述地址请求包括用 户设备 UE的 DHCP请求和所述 UE的用户特征信息;
所述转发设备根据所述 DHCP请求向 DHCP服务网元获取为所述 UE 分配的 IP地址;
所述转发设备获取控制设备根据所述 UE 的用户特征信息和为所述 UE分配的 IP地址下发的第一指示信息, 所述第一指示信息用于指示当收 到目的地址为所述 IP地址的报文时, 根据所述用户特征信息, 发送所述报 文至所述 UE;
所述转发设备根据所述用户特征信息发送所述 IP地址至所述 UE。
11、 根据权利要求 10 所述的地址分配方法, 其特征在于, 所述转发 设备根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP地址, 具体包括:
所述转发设备发送所述 DHCP请求至所述 DHCP服务网元,并接收所 述 DHCP服务网元发送的 DHCP请求响应, 其中所述 DHCP请求响应包括 为所述 UE分配的 IP地址, 所述 DHCP请求响应的目的地址为所述为 UE 分配的 IP地址;
所述转发设备根据所述用户特征信息发送所述 IP地址至所述 UE, 具 体包括:
所述转发设备根据所述第一指示信息, 发送所述 DHCP请求响应至所 述 UE。
12、 根据权利要求 10或 11所述的地址分配方法, 其特征在于, 所述 转发设备根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP 地址; 所述转发设备获取控制设备根据所述 UE 的用户特征信息和为所述 UE分配的 IP地址下发的第一指示信息 IP地址, 具体包括:
所述转发设备向所述控制设备发送所述 DHCP请求和所述 UE的用户 特征信息; 其中, 所述控制设备集成 DHCP服务;
所述转发设备接收所述控制设备发送的为所述 UE分配的 IP地址和所 述第一指示信息。
13、 根据权利要求 10或 11所述的地址分配方法, 其特征在于, 所述 转发设备根据所述 DHCP请求向 DHCP服务网元获取为所述 UE分配的 IP 地址, 具体包括:
所述转发设备向 DHCP服务器发送所述 DHCP请求;
所述转发设备接收所述 DHCP服务器为所述 UE分配的 IP地址; 所述转发设备获取控制设备根据所述 UE 的用户特征信息和为所述
UE分配的 IP地址下发的第一指示信息, 具体包括:
所述转发设备发送为所述 UE分配的 IP地址和所述 UE的用户特征信 息至所述控制设备, 并接收所述控制设备根据所述为 UE分配的 IP地址和 所述 UE的用户特征信息下发的第一指示信息。
14、 根据权利要求 13 所述的地址分配方法, 其特征在于, 所述转发 设备向 DHCP服务器发送所述 DHCP请求, 具体包括:
所述转发设备发送所述 DHCP请求至所述控制设备;
所述转发设备接收所述控制设备发送的第二指示信息, 所述第二指示 信息用于指示当收到所述 DHCP请求时,转发所述 DHCP请求至所述 DHCP 服务器;
所述转发设备向所述 DHCP服务器发送所述 DHCP请求, 具体包括: 所述转发设备根据所述第二指示信息向所述 DHCP 服务器发送所述 DHCP请求。
15、 一种地址分配方法, 应用于控制面与转发面分离的系统, 其特征 在于, 包括:
控制设备获取用户设备 UE的用户特征信息和为所述 UE分配的 IP地 址;
所述控制设备发送第一指示信息至转发设备, 所述第一指示信息用于 指示所述转发设备当收到目的地址为所述 IP地址的报文时,根据所述用户 特征信息, 发送所述报文至所述 UE, 其中, 所述转发设备由所述控制设备 进行控制。
16、 根据权利要求 15 所述的地址分配方法, 其特征在于, 所述控制 设备获取用户设备 UE的用户特征信息和为所述 UE分配的 IP地址, 具体 包括:
所述控制设备接收所述转发设备发送的所述 UE的 DHCP请求和所述 UE的用户特征信息; 其中, 所述控制设备集成 DHCP服务;
所述控制设备为所述 UE分配 IP地址;
所述控制设备根据所述 UE的用户特征信息和为所述 UE分配的 IP地 址下发为所述 UE分配的 IP地址和第一指示信息至所述转发设备。
17、 根据权利要求 15 所述的地址分配方法, 其特征在于, 所述控制 设备获取用户设备 UE的用户特征信息和为所述 UE分配的 IP地址, 具体 包括:
所述控制设备接收所述转发设备发送的为所述 UE分配的 IP地址和所 述 UE的用户特征信息, 并根据为所述 UE分配的 IP地址和所述 UE的用 户特征信息下发所述第一指示信息给所述转发设备。
18、 根据权利要求 17所述的地址分配方法, 其特征在于, 所述控制设备接收所述转发设备发送的所述 IP 地址和所述用户特性 信息, 具体包括:
所述控制设备接收所述转发设备发送的所述 UE的 DHCP请求; 所述控制设备发送第二指示信息至所述转发设备, 所述第二指示信息 用于指示所述转发设备当收到所述 DHCP请求时, 转发所述 DHCP请求至 所述 DHCP服务器。
19、 一种控制面与转发面分离的系统, 其特征在于, 包含权利要求 1-5 任一项所述的转发设备以及权利要求 6-9任一项所述的控制设备。
PCT/CN2013/078068 2013-06-26 2013-06-26 一种ip地址分配的系统和方法 WO2014205700A1 (zh)

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PT191892660T PT3661167T (pt) 2013-06-26 2013-06-26 Método e sistema de atribuição de endereços ip
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