CN103825825A - Flexible, extensible and safe inter-domain topology discovery method - Google Patents
Flexible, extensible and safe inter-domain topology discovery method Download PDFInfo
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Abstract
The invention discloses a flexible, extensible and safe inter-domain topology discovery method. On the basis of the existing software definition network inter-domain topology discovery method, through improving a link layer discovery protocol data packet, a software definition network domain is discovered to be in topology connection with the adjacent software definition network domain in a distributed software definition network. The method disclosed by the invention is simple and safe, and can successfully solve the problem of inter-domain topology discovery among a plurality of domains in the distributed software definition network.
Description
Technical field
The present invention relates to software defined network technical field, relate in particular to a kind of can expand flexibly and safety territory between topology discovery method.
Background technology
In legacy network, between territory, Topology Discovery is to realize according to the Exterior Gateway Protocol such as BGP, and because conventional method depends on concrete agreement, flexibility and manageability are poor, and Topology Discovery is together with route calculations incorporated, and extensibility is poor.In software defined network (SDN), provide unified network view (Network View) interface using Topology Discovery as module independently to business such as routing managements, by using domain-to-domain link layer to find that agreement (LLDP) realizes discovering network topology; Topology Discovery module real-time servicing the whole network consistency network view, does not need to rely on other business, has effectively improved flexibility and the extensibility of network management.But existing mode is not considered the network attack such as Sybil, RIB Poisoning occurring in network, will cause in communication process the safety problems such as the clueless and information dropout of communication entity.
When between the territory of legacy network, topological structure changes, its data surface renewal meeting is carried out according to the Exterior Gateway Protocol such as BGP.BGP regulation, the boundary node in territory uses the boundary node of Transmission Control Protocol and adjacent domains to connect, to build neighborhood; Between neighbours, mutually send NLRI lastest imformation, with switching and routing table.By these modes, boundary node is able to obtain in time up-to-date inter-domain routing topology.But exist Topology Discovery to depend on concrete agreement, manageability and flexibility are poor, and because renewal process depends on routing algorithm, convergence process is slower, cause other business cannot obtain in time the up-to-date topological structure of network, there are security breaches.
In the SDN network architecture, SDN controller with centralized system control by territory that multiple switch was formed, between the territory of this territory and other interconnected domains, the consistency maintenance of topology is realized by LLDP agreement, and LLDP agreement sends LLDP packet every certain time interval from all of the port of switch in territory.Topology Discovery and other business are separate, in the time that between territory, network topology changes, between territory, Topology Discovery module is upgraded network view, other business are obtained up-to-date consistency network view by the interface that between territory, Topology Discovery module outwards provides, and have improved flexibility and the extensibility of network.
The present invention relates to use existing concept, technology or instrument in following SDN:
SDN controller is the control software according to OpenFlow Protocol Design, flows for management traffic, configure network devices, formulation the communication of showing (Flow Table), bearing Network and LA Management Room.Territory can be by a controller centralized control, or by the distributed control of multiple controllers.
Switch in SDN is obeyed OpenFlow agreement, claims OpenFlow switch (OFS).OFS is by the management and control of SDN controller, and its stream table is formulated and revised by SDN controller.
The escape way of OpenFlow agreement support is realized the communication between OFS and SDN controller.
Network view (Network View) is physical link state information and the each OFS node status information in the territory of real-time servicing in SDN network and between territory.
OpenFlow agreement is referring to OpenFlow Switch Specification Version 1.0.2 (Wire Protocol 0x01), December 31,2009.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of can expand flexibly and safety territory between topology discovery method.
The object of the invention is to be achieved through the following technical solutions: a kind of can expand flexibly and safety territory between topology discovery method, comprise the steps:
Step 1: in initial network, each OpenFlow switch (OFS) is connected with a software defined network (SDN) controller, form a territory by all OFS of same SDN controller management, each OFS has the unique identifier of the whole network (DataPathId), there is the unique Field Number of the whole network (Domain ID) in each territory, each controller has a pair of public/private keys pair, private key is maintained secrecy, each SDN controller is safeguarded a cipher key store, the public/private keys that comprises this territory in cipher key store to the PKI in other territories, PKI is searched cipher key store by unique Field Number in territory and is obtained.
Step 2:SDN controller is being received after the link information that OFS sends, generate the LLDP packet expanding, the LLDP packet expanding is except comprising that the essential information that LLDP requires (comprises Chassis ID, Port ID, TTL and End TLV) outside, also comprise Field Number (Domain ID), send sequence number (TimeStamp) and sign (Signature), the unique identification that wherein Domain ID is each territory, TimeStamp is in order to verify whether the LLDP bag of receiving is up-to-date one, Signature is other all fields with the private key verification LLDP packet of this controller,
The expansion LLDP packet that step 3:SDN controller generates step 2, interval sends from OFS all of the port at regular intervals;
Step 4:SDN controller is received the expansion LLDP packet that this territory OFS sends, and according to the DataPathId carrying in packet, SDN controller is searched this DataPathId in the OFS in this territory information bank; If find corresponding DataPathId, explanation is the expansion LLDP packet in this territory, ignores; If do not find corresponding DataPathId, explanation is the expansion LLDP packet that other territories are received in this territory, and SDN controller obtains Signature, TimeStamp and Domain ID from expand LLDP packet;
Step 5: the Domain ID obtaining according to step 4 searches cipher key store and gets the PKI that sends this expansion LLDP packet territory;
Step 6: the PKI obtaining according to step 5 carrys out with RSA cryptographic algorithms the Signature that verification step 4 obtains;
Step 7: do not pass through if step 6 is verified Signature, abandon this packet; If checking Signature passes through, SDN controller obtains the switch ports themselves tuple (SwitchPortTuple) that sends the OFS of this expansion LLDP packet in this territory, in the switch ports themselves tuple of safeguarding and TimeStamp mapping table, searches this SwitchPortTuple at this SDN controller;
Step 8: if step 7 finds this SwitchPortTuple, the TimeStamp returning according to mapping table, the TimeStamp value obtaining with step 4 compares, if result is relatively that TimeStamp is little, before illustrating, received larger TimeStamp, abandoned; If step 7 does not find this SwitchPortTuple, illustrate that this is first expansion LLDP packet of receiving after connecting, this SwitchPortTuple and sequence number TimeStamp are updated in mapping table to more network view (Network View) between neofield of while.
The invention has the beneficial effects as follows:
First, contrast topology discovery method between other SDN controller territory, the LLDP agreement that use of the present invention is identical with Topology Discovery in territory, increase Field Number (Domain ID), sent sequence number (TimeStamp) and sign (Signature), the Field Number of controller and its PKI have corresponding relation, data and authorization information are all included in LLDP bag, and the PKI between domain controller is to search cipher key store by Field Number to obtain.Simultaneously, owing to using the existing public/private keys of controller itself to Topology Discovery process between, signature verification territory, the present invention is not increasing under the prerequisite of system complexity, has improved the fail safe of consistency network view maintenance between territory.
Secondly, contrast network security scheme between existing territory, the present invention is based on software defined network (SDN), Topology Discovery and route are calculated separate, get between unified territory after topology, can offer various Routing Protocol, and need not obtain alone topology between territory, and realize separately safety approach by each Routing Protocol example, thereby improve the flexibility of control strategy, strengthened the extensibility of system simultaneously.
Accompanying drawing explanation
Fig. 1 be a kind of can expand flexibly and the territory of safety between the flow chart of topology discovery method;
Fig. 2 is network topology structure schematic diagram between software defined network territory.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing, it is more obvious that object of the present invention and effect will become.
The present invention is based on topology discovery method between the territory in existing SDN network, proposed a kind of can expand flexibly and safety territory between topology discovery method, comprise the following steps:
Step 1: in initial network, each OpenFlow switch (OFS) is connected with a software defined network (SDN) controller, form a territory by all OFS of same SDN controller management, each OFS has the unique identifier of the whole network (DataPathId); There is the unique Field Number of the whole network (Domain ID) in each territory; Each controller has a pair of public/private keys pair, and private key is maintained secrecy; Each SDN controller is safeguarded a cipher key store, the public/private keys that comprises this territory in cipher key store to the PKI in other territories, the PKI in other territories obtains by its Field Number.In Fig. 2, OFS1-OFS12 is OpenFlow switch, and OFS1-OFS4 forms a territory D1, and by SDN controller, C1 controls, and OFS5-OFS8 forms a territory D2, and by SDN controller, C2 controls, and OFS9-OFS12 forms a territory D3, and by SDN controller, C3 controls.
Step 2:SDN controller is being received after the link information that OFS sends, generate the LLDP packet expanding, except comprising that the essential information that LLDP requires (comprises Chassis ID, Port ID, TTL and End TLV) outside, increase Field Number (Domain ID), send sequence number (TimeStamp) and sign (Signature), the unique identification that wherein Domain ID is each territory, TimeStamp is in order to verify whether the LLDP bag of receiving is up-to-date one, Signature is by other all fields in the private key verification LLDP packet of this controller,
The expansion LLDP packet that step 3:SDN controller generates step 2, interval sends from OFS all of the port at regular intervals;
The time interval is herein set voluntarily by network manager or researcher, as 5s, 15s etc. all can.
Step 4:SDN controller is received the expansion LLDP packet that this territory OFS sends, and according to the DataPathId carrying in packet, SDN controller is searched this DataPathId in the OFS in this territory information bank; If find corresponding DataPathId, explanation is the expansion LLDP packet in this territory, ignores; If do not find corresponding DataPathId, explanation is the expansion LLDP packet that other territories are received in this territory, and SDN controller obtains Signature, TimeStamp and Domain ID from expand LLDP packet;
Step 5: the Domain ID obtaining according to step 4 searches cipher key store and gets the PKI that sends this expansion LLDP packet territory;
Step 6: the PKI obtaining according to step 5 carrys out with RSA cryptographic algorithms the Signature that verification step 4 obtains;
Step 7: do not pass through if step 6 is verified Signature, abandon this packet; If checking Signature passes through, SDN controller obtains the switch ports themselves tuple (SwitchPortTuple) that sends the OFS of this expansion LLDP packet in this territory, in the switch ports themselves tuple of safeguarding and TimeStamp mapping table, searches this SwitchPortTuple at this SDN controller;
Step 8: if step 7 finds this SwitchPortTuple, the TimeStamp returning according to mapping table, the TimeStamp value obtaining with step 4 compares, if result is relatively that TimeStamp is little, before illustrating, received larger TimeStamp, abandoned; If step 7 does not find this SwitchPortTuple, illustrate that this is first expansion LLDP packet of receiving after connecting, this SwitchPortTuple and sequence number TimeStamp are updated in mapping table to more network view (Network View) between neofield of while.
The present invention by adopt a kind of can expand flexibly and safety territory between topology discovery method realize the Topology Discovery between distributed software define grid (SDN) control domain, based on topology discovery method between existing SDN network domains, increase signature-verification process, the method realizes simply, safer, effectively solved between distributed SDN territory Topology Discovery problem between the territory of safety.
Claims (1)
1. can expand flexibly and safety territory between a topology discovery method, it is characterized in that, comprise the steps:
Step 1: in initial network, each OpenFlow switch is connected with a software defined network controller, all OpenFlow switches by same software defined network controller management form a territory, each OpenFlow switch has the unique identifier DataPathId of the whole network, there is the unique Field Number Domain ID of the whole network in each territory, each controller has a pair of public/private keys pair, private key is maintained secrecy, each software defined network controller is safeguarded a cipher key store, the public/private keys that comprises this territory in cipher key store to the PKI in other territories, PKI is searched cipher key store by unique Field Number in territory and is obtained,
Step 2: software defined network controller is being received after the link information that OpenFlow switch is sent, generate the LLDP packet expanding, the LLDP packet expanding is except comprising that the essential information that LLDP requires (comprises Chassis ID, Port ID, TTL and End TLV) outside, also comprise Field Number Domain ID, TimeStamp and signature Signature send sequence number, the unique identification that wherein Domain ID is each territory, TimeStamp is in order to verify whether the LLDP bag of receiving is up-to-date one, Signature is other all fields with the private key verification LLDP packet of this controller,
Step 3: the expansion LLDP packet that software defined network controller generates step 2, interval sends from OpenFlow switch all of the port at regular intervals;
Step 4: software defined network controller is received the expansion LLDP packet that this territory OpenFlow switch sends, according to the DataPathId carrying in packet, software defined network controller is searched this DataPathId in the OpenFlow in this territory exchanger information storehouse; If find corresponding DataPathId, explanation is the expansion LLDP packet in this territory, ignores; If do not find corresponding DataPathId, explanation is the expansion LLDP packet that other territories are received in this territory, and software defined network controller obtains Signature, TimeStamp and Domain ID from expand LLDP packet;
Step 5: the Domain ID obtaining according to step 4 searches cipher key store and gets the PKI that sends this expansion LLDP packet territory;
Step 6: the PKI obtaining according to step 5 carrys out with RSA cryptographic algorithms the Signature that verification step 4 obtains;
Step 7: do not pass through if step 6 is verified Signature, abandon this packet; If checking Signature passes through, software defined network controller obtains the switch ports themselves tuple SwitchPortTuple that sends the OpenFlow switch of this expansion LLDP packet in this territory, in the switch ports themselves tuple of safeguarding and TimeStamp mapping table, searches this SwitchPortTuple at this software defined network controller;
Step 8: if step 7 finds this SwitchPortTuple, the TimeStamp returning according to mapping table, the TimeStamp value obtaining with step 4 compares, if result is relatively that TimeStamp is little, before illustrating, received larger TimeStamp, abandoned; If step 7 does not find this SwitchPortTuple, illustrate that this is first expansion LLDP packet of receiving after connecting, this SwitchPortTuple and sequence number TimeStamp are updated in mapping table to more network view Network View between neofield of while.
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| CN104038446A (en) * | 2014-06-06 | 2014-09-10 | 华为技术有限公司 | Link discovery method and device |
| CN104519420A (en) * | 2014-12-24 | 2015-04-15 | 北京格林伟迪科技有限公司 | Packet forwarding method in passive optical network |
| CN104980431A (en) * | 2015-05-14 | 2015-10-14 | 南京大学 | Consistency updating method for achieving orderly stream in SDN |
| CN105337853A (en) * | 2014-06-11 | 2016-02-17 | 杭州华三通信技术有限公司 | Instance establishing method and apparatus in software defined network (SDN) |
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