CN103986651B - A kind of software defined network controller and its control method - Google Patents
A kind of software defined network controller and its control method Download PDFInfo
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- CN103986651B CN103986651B CN201410239489.8A CN201410239489A CN103986651B CN 103986651 B CN103986651 B CN 103986651B CN 201410239489 A CN201410239489 A CN 201410239489A CN 103986651 B CN103986651 B CN 103986651B
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Abstract
The invention discloses a kind of control method of software defined network controller, this method includes：The backup path of main path is calculated according to acquired each link overhead of software defined network SDN topological sum；The flag bit for marking backup path is distributed for each backup path；Flow table item is issued to each SDN forwarding units on the backup path according to backup path and respective flag position, during so that main path breaking down, message matches the flow table item and forwarded by backup path.The invention also discloses a kind of software defined network controller.The link for being capable of converting flow in a network using the present invention occurs breaking or when topology changes, and ensures not losing for before SDN controllers calculate and handle new flow flow.
Description
Technical field
The present invention relates to network communication technology field, more particularly to a kind of software defined network controller and its controlling party
Method.
Background technology
OpenFlow is one defined in SDN (Software Defined Network, software defined network) framework
Communication interface standard between controller and forwarding.OpenFlow allows directly to access and the forwarding of the operation network equipment is put down
Face, these network equipments are probably physically, it is also possible to virtual.OpenFlow thought is separation control plane sum
According to plane, therebetween using the protocol communication of standard；Datum plane is forwarded by the way of based on stream.OpenFlow nets
Network is made up of SDN forwarding units and SDN controllers OpenFlow passages (OpenFlow Channel).SDN controllers are
Control centre, SDN forwarding units are sent to according to the protocol generation flow table of the configuration of user or dynamic operation.SDN controllers
Upper possible running experiment program, or software of third party's exploitation etc..SDN forwarding units receive the stream that SDN controllers are set
Table, and Message processing, state and the event such as interface UP/DOWN to SDN controller report equipment are carried out according to flow table.In SDN
Communicated between forwarding unit and controller by OpenFlow passages (being based on TCP or SSL).
OpenFlow forwarding processes are：Message is being tabled look-up after entering equipment since the flow table (Flow Table) of minimum,
The inquiry of multiple flow tables being carried out, once matched in some flow table, the behavior aggregate (Action of this message can be updated
Set), behavior aggregate is the set acted, is initially empty, and the operation to message is all placed in this set.Complete last stream
After the processing of table, the everything in behavior aggregate can be performed, and now the content of message can be changed, then from specified outgoing interface
Forward.
In OpenFlow networks, after having flow to enter in OpenFlow networks, first packet reports SDN controllers,
Then SDN controllers issue SDN forwarding units after calculating path, instruct the forwarding of SDN forwarding units.In existing network, warp
Often it happens is that the failure of link or network topology transformed in order to adjust network, at this moment when converting flow in network
When breaking occurs in link or topology changes, SDN forwarding units can be in the OpenFlow messages interacted with SDN controllers
Middle which port of report is gone wrong, and SDN controllers are received after parsing perceives port problem after the message, can be to passing through this
All flows of link are recalculated, and are re-issued flow table after calculating, are instructed the forwarding of SDN forwarding unit flows.
Current implementation method has one disadvantage in that.Change when broken or topology occurs in the link of converting flow in network
When, from SDN forwarding units perceive port problem to new flow issue afterwards instruct forwarding this period can only flow
All it is to be forwarded according to original flow, this, which can result in the flow within this period, all to lose.Even if SDN is forwarded
Equipment thinks that the outgoing interface of flow table breaks down, and stopped the forwarding of flow table, but before new flow table calculates, flow is
Have no idea what is ensured.
The content of the invention
It is an object of the invention to provide a kind of software defined network controller and its control method, when forwarding flow in network
When breaking occurs in the link of amount or topology changes, the flow before SDN controllers calculate and handle new flow is ensured
Do not lose.
For achieving the above object, the invention provides a kind of control method of software defined network controller, the party
Method includes：
The backup path of main path is calculated according to acquired each link overhead of software defined network SDN topological sum；
The flag bit for marking backup path is distributed for each backup path；
Flow table item is issued to each SDN forwarding units on the backup path according to backup path and respective flag position, so that main
During path fails, message matches the flow table item and forwarded by backup path.
For achieving the above object, present invention also offers a kind of software defined network controller, the controller to include：
Backup path determining unit, for according to acquired each link overhead of software defined network SDN topological sum
Calculate the backup path of main path；
Flag bit allocation unit, for distributing the flag bit for marking backup path for each backup path；
Flow table issuance unit, for according to backup path and respective flag position to each SDN forwarding units on the backup path
Flow table item is issued, during so that main path breaking down, message matches the flow table item and forwarded by backup path.
In summary, the embodiment of the present invention is according to acquired each link overhead of software defined network SDN topological sum
Calculate the backup path of main path；The flag bit for marking backup path is distributed for each backup path；According to backup path and
Respective flag position issues flow table item to each SDN forwarding units on the backup path, during so that main path breaking down, message matching
The flow table item is forwarded by backup path.Compared with prior art, it can ensure and new stream is calculated in SDN controllers
Existing flow is not influenceed while flow is not lost before amount path.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of software defined network controller control method provided by the invention.
Fig. 2 is position view of the flag bit in heading.
Fig. 3 provides software defined network topology schematic diagram for the embodiment of the present invention.
Fig. 4 is the structural representation of software defined network controller provided in an embodiment of the present invention.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, develop simultaneously embodiment referring to the drawings, right
The present invention program is described in further detail.
The present invention core concept be：When the link of converting flow in network occurs broken or topology change
Wait, from SDN forwarding units perceive port problem to new flow issue afterwards instruct forwarding this period can only flow be all
Forwarded according to original flow, this, which can result in the flow within this period, all to lose.The present invention is according to network
Topology calculates flow table of the link of converting flow on every SDN forwarding unit outgoing interface and the backup road of a backup
Footpath, when main interface breaks down, SDN forwarding units are voluntarily carried out flow switch to backup outgoing interface and to flow
Mark, the flow that the SDN forwarding units passed through afterwards also all issue corresponding flow table item matched indicia in advance are forwarded, ensured
Flow does not lose before SDN controllers calculate and handle new flow.
As shown in figure 1, the schematic flow sheet of the control method of SDN controllers provided by the invention comprises the following steps：
Step 101, the standby of main path is calculated according to acquired each link overhead of software defined network SDN topological sum
Part path；
Step 102, flag bit for marking backup path is distributed for each backup path；
Step 103, flow table issued to each SDN forwarding units on the backup path according to backup path and respective flag position
, during so that main path breaking down, message matches the flow table item and forwarded by backup path.
By the method shown in Fig. 1, when main path breaks down, the flow table on backup path is directly matched, walks backup
Path carries out flow forwarding, so as to ensure not losing for before SDN controllers calculate and handle new flow flow.
Here, for marking the flag bit of backup path, the general idle field used in IP headings, including service class
Type (Type of Service, TOS) field, filling (Padding) field etc..Position of the flag bit in heading such as Fig. 2 institutes
Show.The flag bit of the present invention, in main path failure, message makes report by matching the flag bit of flow table on backup path
Text forwards from backup path, and then plays a part of marking backup path.
For the clear explanation present invention, concrete scene is set forth below and is described in detail.The embodiment of the present invention uses TOS fields
Backup path is marked as flag bit.
As shown in figure 3, SDN topology is set including the SDN controllers and SDN forwardings by having run openflow agreements
Standby DUTA-DUTF is formed.
In a step 101, the first step, SDN controllers pass through Link Layer Discovery Protocol (LLDP) message in SDN first
It was found that network topology structure.
When SDN controllers need to obtain current network topology, first sent to the SDN forwarding units being attached thereto
Packet-out message, the data of carrying are the LLDP messages of SDN controllers construction, and action item (action) is to all
Openflow ports are sent.Neighbours' SDN forwarding units are monitored simultaneously after receiving the LLDP messages that broadcast comes by packet socket
Copy portion arrives openflow processes.Openflow processes carry out flow table item to the LLDP messages of acquisition in all examples
Match somebody with somebody, if the match is successful and action is above to send Controller, then just by LLDP messages inbound port and LLDP message numbers
The Controller being sent to according to being encapsulated into packet-in message in example.Controller is exactly by describe above
's：Into example, all SDN forwarding units being attached thereto send the packet-out message for carrying LLDP messages, and receive and take
Packet-in message with corresponding LLDP messages and inbound port, to know which port is connection, and then it can analyze whole
Individual network topology.
Second step, the bandwidth of equipment link is counted using OpenFlow, every SDN forwarding unit is issued
Packet-out message, SDN forwarding units are allowed to report the bandwidth information of each interface, so as to calculate each link overhead (cost)
Value.
Specifically, according to the bandwidth information of two ports on the link reported, the bandwidth value of link is determined, if band
Wide information both ends are consistent, then take the consistent bandwidth value as link bandwidth value；If bandwidth information both ends are inconsistent, select
Both ends reckling is as link bandwidth value.Simultaneously according to link overhead=1000M/ link bandwidth values, for each chain road sign
Know link cost value.The cost that the cost that so can be obtained by the DUTA-DUTC that upper figure is identified is 3, DUTA-DUTB is 1
Etc..
So as to the topological structure of one whole network of formation and each link cost value on SDN controllers.
3rd step, choose the main path for needing to carry out backup calculating.Due to all path computing backup paths and under
Send out that the expense of backup flow is bigger, thus can specify by hand here path needs backup that a certain bar flow passes through or
The maximum path of person's converting flow, naturally it is also possible to back up all paths of whole network.In this example we specify main path from
INT D interface of the INT A interfaces of DUTA equipment to DUTC equipment.
4th step, using Loop Free Alternate (LFA) algorithms come for main path computing backup path.Specifically
Standard may be referred to be RFC5286 and RFC5715 corresponding to it.For Loop Free Alternate technologies, in fact
It is that the backup next-hop that will not form loop is found out for every next-hop routeing, therefore the computational methods of backup next-hop are exactly
The core of this technology.The core concept of algorithm is exactly to DUTA- in this example>If DUTC is backed up, backup path hypothesis is
DUTA->DUTB->DUTD->, it is necessary to meet COST2 (DUTB- if DUTC>DUTD)+COST1(DUTC->DUTD)<COST1
(DUTA->DUTB)+COST3(DUTA->DUTC).DUTA- can be calculated by LFA algorithms>The backup path of DUTC links is
DUTA->DUTB->DUTD->DUTC。
In a step 102, TOS value is distributed for each backup path.Just to standby if not enough distribution
Part path is analyzed, as long as no the path can distribution identical TOS values by same SDN forwarding unit.Also
It is to say, in the present invention, TOS values are used to mark backup path, can be that each different TOS value of backup path distribution is next unique
A backup path is identified, can also be in two or more than two backup paths by same SDN forwarding unit
In the case of, distribute identical TOS values for this two or more than two backup paths.In the latter case, two it is not overlapping
Backup path, even if being assigned with identical TOS values, flow also would not produce conflict without going past same equipment, forwarding,
It means that one backup path of TOS values unique mark is only effective to this equipment, if being provided with a plurality of backup in this equipment
The flow table item in path, then TOS values must be different, could realize from each self-corresponding outgoing interface and be correctly forwarded to different backup paths
On, otherwise, backup path is not unique, and forwarding can be caused to conflict.Assume there is the first main path DUTA- in the embodiment of the present invention>
DUTC, corresponding backup path DUTA->DUTB->DUTD->DUTC, DUTA are referred to as entrance SDN forwarding units, and DUTB, DUTD claim
For middle SDN forwarding units, DUTC is referred to as exporting SDN forwarding units；Second main path DUTC->DUTE, corresponding backup path
DUTC->DUTD->DUTF->DUTE, DUTC are referred to as entrance SDN forwarding units, and DUTD, DUTF are referred to as middle SDN forwarding units,
DUTE is referred to as exporting SDN forwarding units.Because two backup paths have overlapping place in this example, it is necessary to distribute different TOS
Value, if the not overlapping can in slave board path distributes identical TOS values, can thus solve the problems, such as that TOS values are not enough.We
To backup path DUTA->DUTB->DUTD->DUTC distribution TOS values are 7, to backup path DUTC->DUTD->DUTF->DUTE
The TOS values of distribution are 6.
In step 103, stream is issued to each SDN forwarding units on the backup path according to backup path and respective flag position
The method of list item specifically includes：
The first flow table item that there is identical match item with the main path is issued for entrance SDN forwarding units, described first
The action item of flow table item is to change to indicate that place value is mark place value corresponding to the backup path, and outgoing interface is going out on backup path
Interface；
The second flow table item is issued for middle SDN forwarding units, the occurrence of second flow table item is the backup path pair
The mark place value answered, action item are the outgoing interface of backup path；
The 3rd flow table item, occurrence the entering for backup path of the 3rd flow table item are issued for outlet SDN forwarding units
Interface, and mark place value corresponding to backup path, action item are that will indicate that place value uses as default corresponding to backup path.
In embodiments of the present invention, for the first main path DUTA->DUTC, corresponding backup path DUTA->DUTB->
DUTD->DUTC, wherein the backup flow table setting up procedure of each SDN forwarding units is：
For entrance SDN forwarding units DUTA, it is necessary to count all flow table items that all above outgoing interfaces of DUTA are INTB,
So as to issue the first flow table item, in first flow table item, occurrence is identical with the flow table occurrence that outgoing interface is INT B, action
Item is that change TOS values are 7, and outgoing interface is INT G.
For middle SDN forwarding units DUTB and DUTD, it is that matching TOS values are 7 to increase by the second flow table item on DUTB
Message outgoing interface be INT I；It is that the message outgoing interface that matching TOS values are 7 is INT to increase by the second flow table item on DUTD
K。
For exporting SDN forwarding unit DUTC, the 3rd flow table item is issued, in the 3rd flow table item, occurrence is from INT L
Into TOS values are 7 flow, and action item is that TOS values are arranged to 0 (in order to reduce flow, to prevent from also walking backup path below
When cause confusion), this completes to link DUTA->DUTC backup.Wherein, TOS values are arranged to 0, equivalent to setting
It is set to default value, it is meant that the flow for walking the backup path terminates in this equipment.
Similarly, the second main path DUTC->The method of the backup of DUTE links is：
For entrance SDN forwarding unit DUTC, all flow table items that all above outgoing interfaces of DUTC are INT D are counted, from
And the first flow table item is issued, in first flow table item, occurrence is identical with the flow table occurrence that outgoing interface is INTD, and action item is
It is 6 to change TOS values, and outgoing interface is INT L；
For middle SDN forwarding units DUTD and DUTF, it is that matching TOS values are 6 to increase by the second flow table item on DUTD
Message outgoing interface be INT M；It is that the message outgoing interface that matching TOS values are 6 is INT to increase by the second flow table item on DUTF
O；
For exporting SDN forwarding unit DUTE, the 3rd flow table item is issued on DUTE, in the 3rd flow table item, matching
Xiang Weicong INT P enter, and TOS values are 6 flow, and action item is that TOS values are arranged to 0.
Thus, when DUTA to DUTC primary link breaks down, DUTA can perceive outgoing interface INTB meetings at once
DOWN falls, and the first flow table item will be matched when such message passes through DUTA, the TOS values in message is changed into 7, in outgoing interface INT
G is forwarded.Flow can thus be forwarded from outlet INT G before controller recalculates path, follow-up equipment
DUTB and DUTD can match the second flow table item that TOS values are 7 and be forwarded, and then flow can reach DUTC safely, then
According to the 3rd flow table item above DUTC, TOS fields are carried out to be reduced to 0, the forwarding of flow is carried out, can thus ensure stream
Amount is not lost.From above-mentioned flow in backup path DUTA->DUTB->DUTD->Forwarding is as can be seen that issue standby on DUTC
Flag bit TOS values on part path in each flow table, play a part of the forwarding of direct traffic path.It is different standby in same equipment
TOS values are different in the flow table item in part path, so as to one backup path of unique mark.
Finally, when SDN controllers recalculate the forward-path of gateway SDN forwarding units, the SDN forwardings of instruction entrance
Equipment deletes the first flow table item, and issues new flow table item, and instruction entrance SDN forwarding units are according to the path recalculated
Forwarding.Specific method is：It is that change TOS values are 7 to cancel the outgoing interface INT G of backup and the Action actions of backup above DUTA
Flow table item, the path calculated according to controller re-start flow forwarding.
As shown in figure 4, SDN controllers provided in an embodiment of the present invention include：
Backup path determining unit 401, for being opened according to acquired each link of software defined network SDN topological sum
Pin calculates the backup path of main path；
Flag bit allocation unit 402, for distributing the flag bit for marking backup path for each backup path；
Flow table issuance unit 403, for being set according to backup path and respective flag position to each SDN forwardings on the backup path
Standby to issue flow table item, during so that main path breaking down, message matches the flow table item and forwarded by backup path.
Include entrance SDN forwarding units, middle SDN forwarding units and outlet SDN forwarding units on the backup path；
The flow table issuance unit 403 is specifically used for：
The first flow table item that there is identical match item with the main path is issued for entrance SDN forwarding units, described first
The action item of flow table item is to change to indicate that place value is mark place value corresponding to the backup path, and outgoing interface is going out on backup path
Interface；
The second flow table item is issued for middle SDN forwarding units, the occurrence of second flow table item is the backup path pair
The mark place value answered, action item are the outgoing interface of backup path；
The 3rd flow table item, occurrence the entering for backup path of the 3rd flow table item are issued for outlet SDN forwarding units
Interface, and mark place value corresponding to backup path, action item are that will indicate that place value uses as default corresponding to backup path.
When controller recalculates the forward-path of gateway SDN forwarding units, the flow table issuance unit 403 is also used
The first flow table item is deleted in instruction entrance SDN forwarding units, and issues new flow table item, instruction entrance SDN forwarding units are pressed
Forwarded according to the path recalculated.
The flag bit allocation unit 402 is specifically used for, if two of which backup path passes through same forwarding unit,
Then different mark place values is distributed for this two backup paths；If each backup path is by different forwarding units, to be each
Backup path distributes identical mark place value.
In summary, the present invention is realized in OpenFlow networks, and SDN controllers pass through the network information of collection, bag
Network topology and link cost value are included, calculates backup path automatically, and issues corresponding flow table item.When main path breaks down
When, the flow table item on backup path is directly matched, backup path is walked and carries out flow forwarding, calculated so as to ensure in SDN controllers
Existing flow is not influenceed while flow is not lost before going out new flow path.
More than, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention.It is all in this hair
Within bright spirit and principle, any modification, equivalent substitution and improvements made etc., protection scope of the present invention should be included in
Within.
Claims (7)
1. a kind of control method of software defined network controller, it is characterised in that this method includes：
Every SDN on main path is calculated previously according to acquired each link overhead of software defined network SDN topological sum to turn
Send out the backup path of equipment；
The flag bit for marking backup path is distributed for each backup path；
Flow table item is issued to each SDN forwarding units on the backup path according to backup path and respective flag position, so that main path
When breaking down, message matches the flow table item and forwarded by backup path；
If two of which backup path passes through same forwarding unit, different flag bits is distributed for this two backup paths
Value；If each backup path distributes identical mark place value by different forwarding units for each backup path.
2. the method as described in claim 1, it is characterised in that include entrance SDN forwarding units, centre on the backup path
SDN forwarding units and outlet SDN forwarding units；
The method for issuing flow table item to each SDN forwarding units on the backup path according to backup path and respective flag position has
Body includes：
The first flow table item that there is identical match item with the main path, first flow table are issued for entrance SDN forwarding units
Action item be that to change mark place value be mark place value corresponding to the backup path, outgoing interface is to go out to connect on backup path
Mouthful；
The second flow table item is issued for middle SDN forwarding units, the occurrence of second flow table item is corresponding to the backup path
Indicate place value, action item is the outgoing interface of backup path；
The 3rd flow table item is issued for outlet SDN forwarding units, the occurrence of the 3rd flow table item is the incoming interface of backup path,
And mark place value corresponding to backup path, action item are that will indicate that place value uses as default corresponding to backup path.
3. method as claimed in claim 2, it is characterised in that when controller recalculates turning for gateway SDN forwarding units
When sending out path, instruction entrance SDN forwarding units delete the first flow table item, and issue new flow table item, the SDN forwardings of instruction entrance
Equipment forwards according to the path recalculated.
4. the method as described in claim 1, it is characterised in that the flag bit includes service type tos field or filling
Padding fields.
5. a kind of software defined network controller, it is characterised in that the controller includes：
Backup path determining unit, for previously according to acquired each link overhead of software defined network SDN topological sum
Calculate the backup path of every SDN forwarding unit on main path；
Flag bit allocation unit, for distributing the flag bit for marking backup path for each backup path；
Flow table issuance unit, for being issued according to backup path and respective flag position to each SDN forwarding units on the backup path
Flow table item, during so that main path breaking down, message matches the flow table item and forwarded by backup path；
The flag bit allocation unit is specifically used for, if two of which backup path passes through same forwarding unit, for this
Two backup path distributes different mark place values；If each backup path is by different forwarding units, for each backup road
Identical mark place value is distributed in footpath.
6. controller as claimed in claim 5, it is characterised in that on the backup path include entrance SDN forwarding units, in
Between SDN forwarding units and outlet SDN forwarding units；
The flow table issuance unit is specifically used for,
The first flow table item that there is identical match item with the main path, first flow table are issued for entrance SDN forwarding units
Action item be that to change mark place value be mark place value corresponding to the backup path, outgoing interface is to go out to connect on backup path
Mouthful；
The second flow table item is issued for middle SDN forwarding units, the occurrence of second flow table item is corresponding to the backup path
Indicate place value, action item is the outgoing interface of backup path；
The 3rd flow table item is issued for outlet SDN forwarding units, the occurrence of the 3rd flow table item is the incoming interface of backup path,
And mark place value corresponding to backup path, action item are that will indicate that place value uses as default corresponding to backup path.
7. controller as claimed in claim 6, it is characterised in that when controller recalculates gateway SDN forwarding units
During forward-path, the flow table issuance unit is additionally operable to indicate that entrance SDN forwarding units delete the first flow table item, and issues new
Flow table item, instruction entrance SDN forwarding units forward according to the path that recalculates.
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