CN105553849A - Conventional IP network and SPTN network intercommunication method and system - Google Patents
Conventional IP network and SPTN network intercommunication method and system Download PDFInfo
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- CN105553849A CN105553849A CN201510836679.2A CN201510836679A CN105553849A CN 105553849 A CN105553849 A CN 105553849A CN 201510836679 A CN201510836679 A CN 201510836679A CN 105553849 A CN105553849 A CN 105553849A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/10—Routing in connection-oriented networks, e.g. X.25 or ATM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
Abstract
The invention discloses a conventional IP network and SPTN network intercommunication method and system. The method comprises the steps that path information and topological information in an SPTN domain are collected; a BGP neighbor is established for a conventional IP network and an SPTN network; the conventional IP network transmits a BGP message to a first-stage control unit to realize message intercommunication of the SPTN network and the conventional IP network; boundary information of the boundary routers of the conventional IP network and boundary forwarding equipment of the SPTN domain is collected; paths between all the boundary nodes of the SPTN network are established, flow table items on the routes are generated, and the generated flow table items are issued to an SPTN data plane; and when data packets come, data forwarding is performed according to the flow table matching situation. The system comprises a topological collection device, an initialization device, an ARP proxy device, an information management device, a routing protocol processing device and a link management device. The conventional IP network is enabled to seamlessly intercommunicate with the SPTN network without influencing original IP network route planning so that network application opening of the SPTN network is facilitated without influencing implementing of existing business.
Description
Technical field
The present invention relates to communication technical field, be specifically related to the method and system of a kind of traditional IP based on SDN control technology and SPTN network interworking.
Background technology
The SDN technology originating from Stanford University is that the innovation of the Internet brings a revolution, control in legacy network and forwarding capability are separated by SDN technology, centralized control mode, flexibly DLL (dynamic link library) is adopted to realize the forwarding mechanism shown based on stream, underlay network device need not be relied on, shield the difference from underlay network device, make network more flexible and intelligent.
PTN network acts on the traditional advantage of optical transport, the requirement transmitted for the sudden of Packet Service flow and statistic multiplexing and designing, and is core and supports multi-service expand to have lower total use cost, use extensive in metropolitan area network with Packet Service.But due to 4G even 5G epoch mobile service extreme enrichment, PTN bearer network encounters new challenge, and as the bandwidth safeguard of explosive increase, the intelligent management of magnanimity business and new business Quick distributor etc., PTN technology has the actuating force of further evolution.The natural high-efficiency pipe control characteristic of SDN can be combined with PTN network introduces SPTN (software definition Packet Transport Network) technology, controlled and the opening of network capabilities by centralized Network Programmable, meet the service operation demand of ICT epoch centered by network better.
For Traditional IP data communication network, each network element has oneself control plane and Forwarding plane respectively, control and forwarding capability integrate, routing function is the essential function of network, but in SPTN network, due to the change of the network architecture, make traditional complete distributed routing mechanism and improper.
Because SPTN network of network framework and existing IP network are very different, and the route of SPTN network is that the mode issuing stream table by centerized fusion device completes, cannot be compatible with the routing mode of existing IP network, realizing interconnecting of traditional IP and SPTN real-time performance route aspect is a severe problem.As shown in Figure 1, after introducing SPTN network, SPTN network is only deployed in some areas in existing network, form single AS (Autonomous Domain) territory, because route discovery mode is different, easily form route " isolated island " across IP network and SPTN network route, so the SPTN completing network builds, under needing to consider not affect the development of existing business, progressively realize the introducing of new equipment and the evolution of existing network, thus solve route " isolated island " problem.On the basis completing networking, further open network application, realizes various increment exploitation, gives full play to the value of network.
Three kinds of potential modes are had to solve traditional IP and SDN intercommunication problem at present, first two mainly uses the solution of the Autonomous Domain network of SDN and the Autonomous Domain network interworking of conventional IP technology for entirety, last one is in Autonomous Domain, the SDN of partial deployment and the solution interconnected of traditional IP, main feature and the Problems existing of three kinds of modes are analyzed as follows.
(1) all data messages of controller process are utilized
In this manner, after one section of message information arrives bound interfaces, mate at bound interfaces, the message mated with bound interfaces is sent to SDN key-course, at the message that control plane will be mated by protocol streams list item with the specified circuit in stream table, carry out computing by Routing Protocol Module and generate kernel route table, the kernel route table generated is incorporated in described stream table to be with the mode of mask, and calculate the path of this route destination of arrival in inside, SDN territory according to the transponder topological structure of SDN key-course, generate and flow list item accordingly, the stream list item of generation is issued to SDN datum plane and carries out data retransmission.Although this mode can realize the intercommunication of traditional IP and SDN, but under this mode, nearly all message information comprises control information and data flow all will be sent to the corresponding routing table of control plane regeneration by bound interfaces, route table items will be very huge, this will increase the load of controller greatly, so be not suitable for use in Large Real internet.
(2) RouteFlow route virtualization virtual IP address route service in SDN is utilized
In this fashion, by RouteFlow virtual machine by SDN device virtualization, each virtual machine is treated as common routing device, conventional router directly communicates with RouteFlow virtual machine and realizes the intercommunication of router and SDN, wherein, RouteFlow is that the route realized based on OpenFlow virtually melts source item, the problem of the datum plane problem that the stream table solving switch generates and issues and control plane Routing Protocol and calculating.RouteFlow by an OpenFlow controller application program, one independently RouteFlow server and virtual network environment form the connectedness that again realizes physical network and run IP route project, in this manner, the cost of router-level topology will be very high, and efficiency is also very low, this mode will be not suitable for being used in catenet.
(3) in Autonomous Domain, the SDN of partial deployment and interconnecting of traditional IP
In this fashion, SDN part only has a territory, is the part in whole AS territory, is connected by edge forwarding equipment with the edge router of traditional IP.All modules are all placed in a control unit, and make control unit need to process a large amount of messages, controller burden is heavier; In addition, in this fashion, SDN controller according to the MAC Address of self network interface by data packet dispatching on forward-path, then by controller issue corresponding stream show the enterprising row data of retransmission unit forwarding until packet arrive destination.But this mode is only suitable in Autonomous Domain, the SDN of partial deployment and interconnecting of traditional IP, only support the mode of a control unit, can not expand to the situation in the multiple SDN territory of multiple controller, extensibility is poor, does not support large-scale network-estabilishing; And be carry out stream table again according to the situation of packet arrival to issue and forward in this manner, the response time will slowly, be not suitable for being used in real network.
Summary of the invention
The invention provides the method and system that a kind of entirety uses the Autonomous Domain network of SPTN and the Autonomous Domain network interworking of conventional IP technology, cannot under the development not affecting existing business to solve SPTN network, progressively realize the islanding problem that the introducing of new equipment and traditional IP complete intercommunication and formed.
For achieving the above object, the technical solution used in the present invention:
A method for traditional IP and SPTN network interworking, comprises the following steps:
Routing information in the two-step evolution unit collection SPTN territory of step one, SPTN network and topology information;
Step 2, specify the border forwarding unit be connected with IP network for SPTN network, and be issued in SPTN network boundary forwarding unit with specifying routing protocol packet feature-modeling specified circuit by protocol streams list item and by stream table according to the border forwarding unit of specifying;
Border router in step 3, traditional IP and SPTN network set up bgp neighbor;
Step 4, set up bgp neighbor after, the routing protocol packet of the border router transmission designated port of traditional IP carries out stream table coupling to border SPTN forwarding unit, the routing protocol packet mated with border SPTN forwarding unit will be sent to one-level control unit by escape way, otherwise abandon, realize the message intercommunication of SPTN network and traditional IP through protocol analysis;
The boundary information of step 5, collection traditional IP border router and SPTN network boundary forwarding unit generates the ARP table of routing table and expansion;
The one-level control unit in step 6, SPTN territory sets up the path between each boundary node of SPTN territory, generate the stream list item of each forwarding unit on this paths, after carrying out protocol encapsulation, the stream list item of generation is issued to SPTN datum plane, when there being packet to enter into SPTN territory from IP network, carry out data retransmission according to stream table match condition.
Further, in step one, first collected routing information and the topology information in this territory by Two-stage control unit, then reported by protocol encapsulation and to synthesize global path information and topology information after one-level control unit carries out protocol analysis and preserve; One-level control unit is for coordinating each Two-stage control unit, and collect the information that Two-stage control unit stores, Two-stage control unit, for managing bottom forwarding unit, obtains the information such as switch status and Link State from underlying device, preserves and uploads.
Further, in step 2, described border forwarding unit is specified by the method for application program; Described step 2 also comprises: after edge switch and Two-stage control unit connect, Two-stage control unit can issue two automatically for externally router and one-level control unit transmit the stream list item of the routing protocol packet of designated port, thus set up SPTN territory one-level control unit and escape way between the SPTN border forwarding unit be connected with Traditional IP territory, for transmitting the message information of the appointment routing protocol packet feature after coupling;
Further, in step 3, border router in traditional IP sends ARP and asks SPTN border forwarding unit, the ARP proxy program of giving Two-stage control unit will be asked from forwarding unit management mouth by the OpenFlow agreement of standard, asked by the OpenFlow Protocol answers ARP of standard, simultaneously, one-level control unit also can send the ARP proxy program of ARP request message to Two-stage control unit by specific network interface card, the MAC Address of border router in request traditional IP, ARP proxy also can the MAC Address of corresponding reply outside router, thus set up bgp neighbor with SPTN network.
Further, in step 4, the border router of traditional IP sends the routing protocol packet of designated port to border SPTN forwarding unit, according to OpenFlow standard management protocol coupling stream table, the message mated with bound interfaces will be sent to one-level control unit by escape way, otherwise abandon, in one-level control unit, after protocol analysis, reply message information, realize the message intercommunication of SPTN network and traditional IP;
Further, in step 5, the border router of traditional IP and the boundary information of connected SPTN border forwarding unit are by extracting the information acquisition in ARP message; SPTN network connects information that the SPTN forwarding unit of destination host and the boundary information of main frame uploaded by standard OpenFlow agreement and the ARP information that main frame sends obtains; Go out corresponding information according to the routing protocol packet information extraction of the designated port received in one-level control unit and set up the routing table comprising prefix and down hop.
Further, in step 6, when there being packet to enter into SPTN network from IP network, add that MPLS-TP label carries out data retransmission according to stream table match condition, be forwarded by coupling MPLS-TP label in the process that SPTN network internal forwards.
For technical solution problem, the present invention also provides the system of a kind of traditional IP based on said method and SPTN network interworking, and this system comprises one-level control unit and Two-stage control unit, and it is as follows that each control unit comprises device:
Collecting topology device, is placed in firsts and seconds control unit respectively, is respectively used to receive and store the Link State in the SPTN network overall situation and territory and network topological information, and sends the information collected to url management device;
Apparatus for initializing, be placed in Two-stage control unit, for carrying out Initialize installation, specify SPTN territory border forwarding unit and by protocol streams list item, stream table be issued in SPTN network boundary forwarding unit according to the border forwarding unit of specifying and the routing protocol packet feature-modeling specified circuit of specifying, and sending boundary information to ARP proxy device;
ARP proxy device, be placed in Two-stage control unit, for resolving and processing the ARP information received, the mac address information returning one-level control unit sets up bgp neighbor to conventional router and traditional IP, and from the ARP information received, extract the information of IP network border router and border, SPTN territory forwarding unit;
Apparatus for management of information, be placed in one-level control unit, for receiving the information of border SPTN forwarding unit that ARP proxy device uploads and main frame, border router and border SPTN forwarding unit, after one-level control unit receives above-mentioned information, these information are synthesized an IP-MAC-DPID-PORT table, and send this table to url management device;
Routing Protocol processing unit, be placed in one-level control unit, for receiving and process the routing protocol packet information of the designated port that conventional router sends, analytic message information is also replied and is set up bgp session, completes the message interaction process of traditional IP and SPTN network;
Url management device, be placed on one-level control unit, for the process to data flow, comprise path calculation module, for to calculate between SPTN territory inner boundary node access path end to end according to Global Topological information, and routing information is fed back to stream table handing module; Stream table handing module, for between boundary node that path calculation module is fed back end to end path become segmented paths according to different Two-stage control dividing elements and add label, be handed down to each Two-stage control unit, on Two-stage control unit, in generation pass, the stream list item of generation, for the stream list item of this paths, is issued to SPTN datum plane by the OpenFlow agreement of standard by each forwarding unit.
Therefore the present invention can bring following useful benefit:
In the present invention, by setting up the bgp neighbor relation of conventional router and SPTN network, for traditional IP, whole SPTN network can regard an ordinary router or common AS territory as, when needing when there being data to be sent to SPTN network, conventional router is the same with original to the processing mode of data, only need to forward the data to SPTN network, after treatment, one-level control unit calculates the path in SPTN network, issue stream table to mate, adopt the mode match information of MPLS-TP label to carry out the forwarding of data message.Therefore, the present invention makes traditional IP seamlessly not affect former IP network route planning with SPTN network interworking, contributes to the open network application under the development not affecting existing business of SPTN network, solves route " isolated island " problem.
Accompanying drawing explanation
In order to clearer explanation embodiment of the present invention technical scheme, be briefly described to the accompanying drawing used required in embodiment and description of the prior art below, accompanying drawing in the following describes is only case study on implementation more of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 be in the present invention SPTN network at the deployment schematic diagram of existing network;
Fig. 2 is the networking schematic diagram in the present invention in embodiment;
Fig. 3 is the schematic flow sheet of method in embodiment in the present invention;
Fig. 4 is the configuration diagram of present system;
Fig. 5 is the collecting topology device schematic diagram in present system;
Fig. 6 is the connection management device schematic diagram in present system.
Embodiment
The embodiment of the present invention provides a kind of based on the IP legacy network of SDN technology and the method and system of SPTN network interworking, to solve the islanding problem of SPTN network.
Better the present invention program is understood in order to make those skilled in the art person, below in conjunction with accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.
Below by specific embodiment, be described in detail respectively.
Please refer to Fig. 2, is the networking schematic diagram in the embodiment of the present invention.
As shown in Figure 2, SPTN network is directly connected with two traditional IP, SPTN network is by datum plane, using planar and control plane composition, datum plane is made up of SPTN forwarding unit, control plane is made up of one-level control unit and the two-layer control plane of Two-stage control unit, each SPTN territory has the forwarding unit of a Two-stage control unit to this territory to control, one-level control unit is on Two-stage control unit, for business between territory and with the control of traditional IP business and coordination, realize the control to whole datum plane, using planar develops corresponding function App under control unit framework, in traditional IP, route and the forwarding of data is carried out by router.
In embodiment one, SPTN network connect main frame and receive from the data flow of traditional IP, source is traditional IP router, and destination is connected main frame by SPTN network, as shown in Figure 3, is divided into following steps:
Routing information in the two-step evolution unit collection SPTN territory of step one, SPTN network and topology information, first passed through to run establishment of connection and the disconnection between aware switch port fast of LLDP agreement by Two-stage control unit, collect routing information and the topology information in this territory, then report one-level control unit by interface protocol encapsulation, after one-level control unit carries out protocol analysis, synthesize global path information and topology information and preserve.
Step 2, specify the border forwarding unit be connected with IP network for SPTN network, border forwarding unit is specified in the method for control plane by application program; According to the border forwarding unit of specifying and appointment routing protocol packet feature, after edge switch and Two-stage control unit connect, Two-stage control unit can automatically create specified circuit and be issued in SPTN network boundary forwarding unit by protocol streams list item and by stream table; Escape way between the SPTN border forwarding unit setting up SPTN territory one-level control unit and be connected with Traditional IP territory, escape way is be bridged to one-level control unit from the forwarding mouth of forwarding unit through two-level controller in an embodiment, for the message information of the appointment routing protocol packet feature after transmission coupling is sent to one-level control unit.
The one-level control unit of the border router in step 3, traditional IP and SPTN network sets up bgp neighbor: the border router in traditional IP sends ARP and asks SPTN border forwarding unit, Two-stage control unit is given by the OpenFlow agreement of standard by request from the management mouth of border forwarding unit, the ARP proxy routine processes ARP run in Two-stage control unit wraps, by the OpenFlow Protocol answers ARP request of standard and the MAC Address of one-level control unit.Simultaneously, one-level control unit also can send the ARP proxy program of ARP request message to Two-stage control unit by specific network interface card, the MAC Address of border router in request traditional IP, ARP proxy also can the MAC Address of corresponding reply outside router, sets up bgp neighbor further with SPTN network.
Step 4, after setting up bgp neighbor, the border router of traditional IP sends the routing protocol packet of designated port, be port numbers be in an embodiment that the TCP message of 179 is to border SPTN forwarding unit, according to OpenFlow standard management protocol coupling stream table, the routing protocol packet mated with border SPTN forwarding unit stream table will be sent to one-level control unit by escape way and process, if do not mated with stream table, abandon, after protocol analysis, reply by escape way the message intercommunication that message information realizes SPTN network and Traditional IP territory again in one-level control unit.
The boundary information of step 5, collection traditional IP border router and SPTN network boundary forwarding unit generates the ARP table of routing table and expansion, and the ARP table of routing table and expansion upgrades at any time, use diverse ways to obtain boundary information according to different borders, be specifically divided into:
A, the ARP message being sent to SPTN network control planes by extraction conventional router for the border router of traditional IP and the boundary information of connected SPTN border forwarding unit obtains, idiographic flow is: the ARP proxy program of Two-stage control unit extracts IP and the MAC Address of conventional router from the ARP bag received, three tables are set up again according to the port of connected SPTN forwarding unit and DPID, map outside router IP and outside router MAC respectively, outside router IP and connect SPTN forwarding unit port, three kinds of relations of SPTN forwarding unit port and DPID are also uploaded to one-level control unit after being encapsulated by interface protocol by these three tables and preserve, by these three tables synthesis IP-MAC-DPID-PORT table in one-level control unit,
B, SPTN network connects information that the SPTN forwarding unit of destination host and the boundary information of main frame uploaded by standard OpenFlow agreement and the ARP information that main frame sends obtains, idiographic flow is: main frame sends ARP request to the two-level controller in territory, place, Two-stage control unit can not reply ARP message after receiving ARP request, but can extract MAC and the IP address of main frame from ARP request.Simultaneously, application by writing voluntarily in Two-stage control unit, acquisition packet-in event is extracted the information of wherein carrying and is shown and DPID and MAC corresponding relation to obtain MAC and PORT, Two-stage control unit can set up a dictionary according to the information obtained, key is DPID, is worth for MAC-PORT and this dictionary is uploaded to one-level control unit, like this, one-level control unit will have all SPTN forwarding unit host informations, finally synthesizes an IP-MAC-DPID-PORT table;
C, to go out corresponding information according to the routing protocol packet information extraction of the designated port received in one-level control unit and set up the routing table comprising prefix and down hop.
The one-level control unit in step 6, SPTN territory sets up the path between each boundary node of SPTN territory, generates the stream list item for each forwarding unit in this route, after carrying out protocol encapsulation, the stream list item of generation is issued to SPTN datum plane.
When there being packet to enter into SPTN territory from IP network, carry out stream table coupling, if the match is successful, then for packet adds that MPLS-TP label carries out data retransmission, until arrive the border forwarding unit connecting destination host, now the MAC Address of packet is become the MAC Address of destination host, so that the packet that destination host receives, complete the process of establishing in path; If mate unsuccessful, abandon.Wherein, be forwarded by coupling MPLS-TP label in the process of SPTN network internal forwarding; Packet is in traditional IP or carry out route and forwarding according to original mode.
The present invention additionally provides the system of a kind of traditional IP based on said method and SPTN network interworking simultaneously, this system comprises one-level control unit and Two-stage control unit, each control unit comprises various device, be described by embodiment two, in embodiment two, SPTN network connect traditional IP and receive from the data flow of another traditional IP, source is traditional IP router, another traditional IP router of destination, as shown in Figure 4, this system comprises:
Collecting topology device, be placed in firsts and seconds control unit respectively, be respectively used to receive and store the Link State in the SPTN network overall situation and territory and network topological information, and send the information collected to url management device, the schematic diagram of two-stage topology gathering-device as shown in Figure 5:
In the process that collecting topology device in Two-stage control unit is connected with control unit at forwarding unit, judge whether forwarding unit access by the event in application program or left, simultaneously by LLDP message fast between perception forwarding unit establishment of connection with disconnect Link State and the topology information of to collect this SPTN territory with this, preserve and also by (Restful interface) after interface protocol encapsulation, information be uploaded to one-level control unit;
Collecting topology device in one-level control unit is after the Link State receiving each SPTN subdomain and topology information, all information is carried out global link state and the topology information of synthesizing the whole SPTN territory of formation, and send the information collected to connection management device.
Apparatus for initializing, be placed in Two-stage control unit, for carrying out Initialize installation, specifying SPTN territory border forwarding unit and being issued in SPTN network boundary forwarding unit according to the border forwarding unit of specifying and the routing protocol packet feature-modeling specified circuit of specifying by protocol streams list item and by stream table; Described border forwarding unit is specified by the method for application program, and send boundary information to ARP proxy device; Apparatus for initializing also comprise set up SPTN territory one-level control unit and be connected with Traditional IP territory SPTN border forwarding unit between escape way, the message information of the appointment routing protocol packet feature after the stream table for transmitting and issue above mates.
ARP proxy device, is placed in each Two-stage control unit, for resolving and processing the ARP information received, comprise ARP information that conventional router sends and SPTN network connect the ARP information that main frame sends:
For the ARP information that conventional router sends, ARP proxy device returns one-level control unit mac address information after resolving ARP information sets up bgp neighbor to conventional router and traditional IP, and from the ARP information received, extract the relevant information of IP network border router and border, SPTN territory forwarding unit, comprise IP and the MAC Address of conventional router, three tables are set up again according to the port of connected SPTN forwarding unit and DPID, map outside router IP and outside router MAC respectively, outside router IP and connect SPTN forwarding unit port, three kinds of relations of SPTN forwarding unit port and DPID are also uploaded to one-level control unit after being encapsulated by interface protocol by these three tables and preserve,
For SPTN network connect the ARP information that main frame sends, ARP proxy device does not reply ARP message after resolving ARP information, but can extract MAC and the IP address of main frame from ARP request.Simultaneously, application by writing voluntarily in Two-stage control unit, acquisition packet-in event is extracted the information of wherein carrying and is shown and DPID and MAC corresponding relation to obtain MAC and PORT, Two-stage control unit can set up a dictionary according to the information obtained, key is DPID, is worth for MAC-PORT and this dictionary is uploaded to one-level control unit to preserve.
Apparatus for management of information, be placed in one-level control unit, for receiving the information of border SPTN forwarding unit that ARP proxy device uploads and main frame, border router and border SPTN forwarding unit, after one-level control unit receives above-mentioned information, these information are synthesized an IP-MAC-DPID-PORT table, receive the routing table that Routing Protocol processing unit provides simultaneously, and send these two tables to url management device.
Routing Protocol processing unit, be placed in one-level control unit, for receiving and process the routing protocol packet information of the designated port that conventional router sends, primary unit is sent to by escape way from the forwarding mouth of edge switch, resolve the message information that receives and reply message information and conventional router sets up bgp session, complete the message interaction process of traditional IP and SPTN network, simultaneously, obtain the routing table comprising prefix and down hop in the message information analytically gone out, and send routing table to connection management device.
Url management device, be placed in one-level control unit, connection management device comprises path calculation module and stream table handing module, device schematic diagram as shown in Figure 6, foundation for path and the process to data flow, comprise path calculation module, for calculate between SPTN territory inner boundary node access path end to end according to Global Topological information, and routing information is fed back to stream table handing module; Stream table handing module, for between boundary node that path calculation module is fed back end to end path become segmented paths according to different Two-stage control dividing elements and be this section of corresponding MPLS-TP label of path allocation, by being handed down to each Two-stage control unit after protocol encapsulation, on Two-stage control unit in generation pass each forwarding unit for the stream list item of this paths, the stream list item of generation is issued to SPTN datum plane, the establishment of finishing service by the OpenFlow agreement of standard.
When there being packet to enter into SPTN territory from IP network, carry out stream table coupling, if the match is successful, then for packet adds that MPLS-TP label carries out data retransmission, until arrive the border forwarding unit connecting object IP network, now the MAC Address of packet is become the MAC Address of the object IP network router be connected with border forwarding unit, so that the packet that object IP network router receives, complete the process of establishing in path; If mate unsuccessful, abandon.Wherein, be forwarded by coupling MPLS-TP label in the process that SPTN network internal forwards, packet is in traditional IP or carry out route and forwarding according to original mode.
It should be noted that, for above-described embodiment, merely provide when source is traditional IP router, destination is that in SPTN network, main frame and source are traditional IP router.Destination is the situation of another traditional IP router through SPTN network islands, the method of the invention and system are equally applicable to that source and destination are main frame in SPTN network, source is main frame in SPTN network, and destination is the situations such as traditional IP.
Embodiments provide the method and system of a kind of traditional IP and SPTN network interworking, carry out by the bgp neighbor relation setting up conventional router and SPTN network the object that respective handling reaches intercommunication again.For one of ordinary skill in the art will appreciate that case study on implementation various methods core concept and according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. a method for traditional IP and SPTN network interworking, is characterized in that, described method comprises:
The two-step evolution unit of step one, SPTN network, comprises the routing information in one-level control unit and Two-stage control unit collection SPTN territory and topology information;
Step 2, specify the border forwarding unit be connected with IP network for SPTN network, and be issued in SPTN network boundary forwarding unit with specifying routing protocol packet feature-modeling specified circuit by protocol streams list item and by stream table according to the border forwarding unit of specifying;
Border router in step 3, traditional IP and SPTN network set up bgp neighbor;
The routing protocol packet of the border router transmission designated port of step 4, traditional IP carries out stream table coupling to border SPTN forwarding unit, the routing protocol packet mated with border SPTN forwarding unit will be sent to one-level control unit by escape way, otherwise abandon, realize the message intercommunication of SPTN network and traditional IP through protocol analysis;
The boundary information of step 5, collection traditional IP border router and SPTN network boundary forwarding unit generates the ARP table of routing table and expansion;
The one-level control unit in step 6, SPTN territory sets up the path between each boundary node of SPTN territory, generate the stream list item of each forwarding unit on this paths, after carrying out protocol encapsulation, the stream list item of generation is issued to SPTN datum plane, when there being packet to enter into SPTN territory from IP network, carry out data retransmission according to stream table match condition.
2. method according to claim 1, it is characterized in that: in step one, first collected routing information and the topology information in this territory by Two-stage control unit, then reported by protocol encapsulation and to synthesize global path information and Global Topological information after one-level control unit carries out protocol analysis and preserve; One-level control unit is for coordinating each Two-stage control unit, and collect the information that Two-stage control unit stores, Two-stage control unit, for managing bottom forwarding unit, obtains the information such as switch status and Link State from underlying device, preserves and uploads.
3. method according to claim 1, is characterized in that: in step 2, and described border forwarding unit is specified by the method for application program; Described step 2 also comprises: after edge switch and Two-stage control unit connect, Two-stage control unit can issue two automatically for externally router and one-level control unit transmit the stream list item of the routing protocol packet of designated port, thus set up SPTN territory one-level control unit and escape way between the SPTN border forwarding unit be connected with Traditional IP territory, for transmitting the message information of the appointment routing protocol packet feature after coupling.
4. method according to claim 1, it is characterized in that: in step 3, border router in traditional IP sends ARP and asks SPTN border forwarding unit, the ARP proxy program of giving Two-stage control unit will be asked from forwarding unit management mouth by the OpenFlow agreement of standard, ARP proxy program in Two-stage control unit is asked by the OpenFlow Protocol answers ARP of standard, simultaneously, one-level control unit also can send the ARP proxy program of ARP request message to Two-stage control unit by specific network interface card, the MAC Address of border router in request traditional IP, ARP proxy also can the MAC Address of corresponding reply outside router.
5. method according to claim 4, it is characterized in that ARP proxy module both can reply the ARP request of outside router, also can reply the ARP request of one-level control unit, ARP proxy module is equivalent to outside router and one-level control unit and sets up the intermediary that BGP is connected.
6. method according to claim 1, is characterized in that: in step 5, and the border router of traditional IP and the boundary information of connected SPTN border forwarding unit are by extracting the information acquisition in ARP message; SPTN network connects information that the SPTN forwarding unit of destination host and the boundary information of main frame uploaded by standard OpenFlow agreement and the ARP information that main frame sends obtains; Extract corresponding information in the routing protocol packet information of the designated port received in one-level control unit from step 4 and set up the routing table comprising prefix and down hop.
7. method according to claim 6, it is characterized in that Two-stage control unit stores the corresponding relation of IP and MAC of outside router and the main frame be connected with SPTN territory, and the corresponding relation of the outbound port in this territory number and local mac address, and corresponding relation is uploaded to one-level control unit.
8. method according to claim 1, it is characterized in that: in step 6, when there being packet to enter into SPTN network from IP network, add that MPLS-TP label carries out data retransmission according to stream table match condition, be forwarded by coupling MPLS-TP label in the process that SPTN network internal forwards.
9. a system for traditional IP and SPTN network interworking, this system comprises one-level control unit and Two-stage control unit, and each control unit comprises various device, it is characterized in that, comprising:
Collecting topology device, is placed in firsts and seconds control unit respectively, for receiving and store Link State in the SPTN network overall situation and territory and network topological information, and sends the information collected to url management device;
Apparatus for initializing, be placed in Two-stage control unit, for carrying out Initialize installation, specify SPTN territory border forwarding unit and by protocol streams list item, stream table be issued in SPTN network boundary forwarding unit according to the border forwarding unit of specifying and the routing protocol packet feature-modeling specified circuit of specifying, and sending boundary information to ARP proxy device;
ARP proxy device, be placed in Two-stage control unit, for resolving and processing the ARP information received, the mac address information returning one-level control unit sets up bgp neighbor to conventional router and traditional IP, and the information extracting IP network border router and border, SPTN territory forwarding unit from the ARP information received is preserved and is uploaded to one-level control unit;
Apparatus for management of information, be placed in one-level control unit, for receiving the information of border SPTN forwarding unit that ARP proxy device uploads and main frame, border router and border SPTN forwarding unit, after one-level control unit receives above-mentioned information, these information are synthesized an IP-MAC-DPID-PORT table, and send this table to url management device;
Routing Protocol processing unit, be placed in one-level control unit, for receiving and process the routing protocol packet information of the designated port that conventional router sends, analytic message information is also replied and is set up bgp session, completes the message interaction process of traditional IP and SPTN network;
Url management device, be placed on one-level control unit, for the process to data flow, comprise path calculation module, for to calculate between SPTN territory inner boundary node access path end to end according to Global Topological information, and routing information is fed back to stream table handing module; Stream table handing module, for between boundary node that path calculation module is fed back end to end path become segmented paths according to different Two-stage control dividing elements and add label, be handed down to each Two-stage control unit, on Two-stage control unit, in generation pass, the stream list item of generation, for the stream list item of this paths, is issued to SPTN datum plane by the OpenFlow agreement of standard by each forwarding unit.
10. system according to claim 9, it is characterized in that: topology management device is placed in firsts and seconds control unit respectively, the collecting topology device wherein in Two-stage control unit by LLDP message fast between perception forwarding unit establishment of connection with disconnect Link State and the topology information of to collect this SPTN territory with this; All information is carried out global link state and the topology information of synthesizing the whole SPTN territory of formation by the collecting topology device in one-level control unit.
11. systems according to claim 9, is characterized in that, also comprise: Routing Protocol processing unit needs to obtain the routing table comprising prefix and down hop in the BGP message information analytically gone out.
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