CN107276916A - Interchanger flow table management method based on agreement unaware retransmission technique - Google Patents
Interchanger flow table management method based on agreement unaware retransmission technique Download PDFInfo
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- CN107276916A CN107276916A CN201710481233.1A CN201710481233A CN107276916A CN 107276916 A CN107276916 A CN 107276916A CN 201710481233 A CN201710481233 A CN 201710481233A CN 107276916 A CN107276916 A CN 107276916A
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- Prior art keywords
- list item
- flow table
- temperature
- packet
- matching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
- H04L49/3009—Header conversion, routing tables or routing tags
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
Abstract
The invention discloses a kind of interchanger flow table management method based on agreement unaware retransmission technique, including：When a data packet arrives, HT is first looked for, if finding the list item of matching, stops searching, and packet is performed corresponding operation according to the list item found；Wherein, HT is the flow table generated according to temperature；If not finding the list item of matching, CT is continued to search for, if the list item of matching is found, and the temperature of corresponding list item exceeds threshold value, then generating new list item according to the information of the header packet information of packet and corresponding list item is inserted into HT；Wherein, CT is the flow table that user issues.This method is based on temperature and carries out flow table management, the disposal ability of interchanger can not only be greatly speeded up, while not influenceing the correctness of switch processes.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of interchanger flow table based on agreement unaware retransmission technique
Management method.
Background technology
Legacy network needs manual configuration special equipment, and process is cumbersome, it is easy to malfunction, and can not make full use of network foundation
The capacity of facility, the control and forwarding of flow place one's entire reliance upon routing device, and these weakness cause legacy network is received huge
Challenge.Software defined network (SDN, Software Defined Network) is considered as solving the problems, such as current network framework most
Promising solution.The central characteristics of software defined network are：Data surface and chain of command separation；The forwarding work(of routing device
Can be abstract, the programmable modification of Routing Protocol.
OpenFlow is current most popular SDN southbound interfaces agreement, however OpenFlow from 1.0 version upgrades till now
1.5 versions, the programmability of network is still limited by the existing field of OpenFlow agreements.Therefore, agreement unaware retransmission protocol
(POF, Protocol Oblivious Forwarding) is proposed to solve above-mentioned agreement Dependence Problem.POF is according to skew
Measure with deflected length to describe any matching field and universal instruction set of host-host protocol.
Conventional router takes longest prefix match (LPM, longest prefix match) rule to carry out packet
Forwarding, but some accurate list items are had in software defined network, if the very big wasting of resources can be caused using LPM, in addition
When there is multiple matching domains, if field above is that have a mask matches and field below is no mask matches, LPM is no longer fitted
With.Likewise, because matching field is probably mask matches, it is impossible to matched using Hash.
Current SDN software switch is taken the flow table for issuing controller to change into accurate flow table and is cached, plus
The implementation of fast switch processes speed, but the temperature for not accounting for list item enters Mobile state adjustment to interchanger flow table, this
Sequencing of the forwarding rate of interchanger dependent on stream will be caused.Other are reason on the scheme that interchanger flow table is managed
By, do not realize, and POF interchangers are not particularly suited for, it is if any proposing that temperature in OpenFlow agreements Pipeline is higher
List item move on to table above from table below, can not be to interchanger however, the flow table in Pipeline has dependence
Performance produce very big lifting, and flow table matching domain different in POF interchangers is different, it is impossible to move on to list item in different tables
In same table.
To sum up, traditional flow table Managed Solution and inapplicable POF interchangers, the flow table Managed Solution of SDN switch do not have
Dynamic adjustment is carried out to flow table according to the temperature of list item, causes sequencing of the interchanger forwarding rate dependent on stream.
The content of the invention
It is an object of the invention to provide a kind of interchanger flow table management method based on agreement unaware retransmission technique, its base
Flow table management is carried out in temperature, the disposal ability of interchanger can not only be greatly speeded up, while not influenceing the correct of switch processes
Property.
The purpose of the present invention is achieved through the following technical solutions：
A kind of interchanger flow table management method based on agreement unaware retransmission technique, including：
When a data packet arrives, HT is first looked for, if find the list item of matching, stops searching, and according to finding
List item performs corresponding operation to packet；Wherein, HT is the flow table generated according to temperature；
If not finding the list item of matching, CT is continued to search for, if the list item of matching is found, and the temperature of corresponding list item
Beyond threshold value, then new list item is generated according to the information of the header packet information of packet and corresponding list item and be inserted into HT；Wherein, CT
The flow table issued for user.
List item in CT is ranked up in advance according to priority；And in T at regular intervals, detection CT each list item heat
Whether degree exceeds threshold value η, if so, the Hot-Flag attributes of corresponding list item then are set into True.
Counter difference values are calculated and obtained before and after the temperature passage time T of each list item；Counter records each list item
It is fitted on the quantity of packet；
Described threshold value η then determines that its initial value is the average value of the temperature of all list items in CT by the way of adaptive；
Afterwards, if HT is less than with η=min (η, ε) renewal threshold values；If HT is full, threshold value is updated with η=ε；Wherein, ε is
In HT closest to 90% position list item temperature.
When searching the list item in HT, Hash matching way is used；When searching the list item in CT, mask matches are used.
The new list item of the generation, which is inserted into HT, to be included：
If HT is less than being inserted directly into；
If HT is full, new list item, which is replaced, is not more than 10% relatively low list item of temperature in HT.
After a certain list item generates new list item and is inserted into HT in CT, retain corresponding list item in CT, and by respective table
The Hot-Flag attributes of item are set to False.
It has the following advantages that as seen from the above technical solution provided by the invention, 1) list item is accurate table in HT
, Hash can be taken to match, and there is list item mask can only search speed slowly by bits match in CT, temperature in CT is high
List item change into the storage of accurate list item and can accelerate packet into HT and search speed.List item is arranged according to priority in CT
Sequence, so data packet matched to one list item can just perform corresponding operating, without traveling through all list items, so as to accelerate to hand over
The disposal ability changed planes.2) list item is set up after accurate list item is inserted into HT in CT, list item in CT is not deleted, because CT
Middle list item is probably to have mask, and accurate list item may only have one, and mistake can be caused by deleting list item in CT.3) packet is arrived
Up to after interchanger, HT is first searched, is found in HT and the lookup that CT avoids repeating no longer is searched after matching list item, certain in CT
One list item is generated after corresponding accurate list item, and the Hot-Flag of the list item is set to False by us, it is to avoid the essence that generation is repeated
True list item.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, being used required in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of interchanger flow table management method based on agreement unaware retransmission technique provided in an embodiment of the present invention
Flow chart；
Fig. 2 is the interchanger flow table management framework figure provided in an embodiment of the present invention based on agreement unaware retransmission technique；
Fig. 3 is the schematic diagram that interchanger flow table provided in an embodiment of the present invention dynamically manages process.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
Fig. 1 is a kind of interchanger flow table management method based on agreement unaware retransmission technique provided in an embodiment of the present invention
Flow chart.As shown in figure 1, it mainly comprises the following steps：
Step S1, the list item in CT is ranked up according to priority in advance；And it is each in T at regular intervals, detection CT
Whether the temperature of list item exceeds threshold value η, if so, the Hot-Flag attributes of corresponding list item then are set into True.
In the embodiment of the present invention, CT (Cold Table) is the flow table that user's (by controller) issues, and its list item has
Priority, counter, the attribute such as Hot-Flag.Wherein, priority when priority attribute refers to data packet matched, that is, work as data
Bag selects the flow table of highest priority when a plurality of list item is matched in interchanger, counter is used for recording what each list item was matched
The quantity of packet, Hot-Flag is used for marking whether list item has higher temperature.
In the embodiment of the present invention, counter difference values are calculated and obtained before and after the temperature passage time T of each list item；Threshold value η is then
Determined by the way of adaptive, its initial value is the average value of the temperature of all list items in CT；Afterwards, if HT is less than using η
=min (η, ε) updates threshold value；If HT is full, threshold value is updated with η=ε；Wherein, ε is the table in HT closest to 90% position
The temperature of item.
Step S2, when a data packet arrives, first looks for HT, if finding the list item of matching, is transferred to step S3；If no
The list item of matching is found, then is transferred to step S4.
In the embodiment of the present invention, the HT (Hot Table) is the accurate flow table generated according to temperature；Search the table in HT
Xiang Shi, uses Hash matching way.
Step S3, stopping are searched, and corresponding operation is performed to packet according to the list item found, then are transferred to step
S8。
Step S4, CT is continued to search for, if finding the list item of matching, be transferred to step S5；If it is not, being then transferred to step S8.
In the embodiment of the present invention, when searching the list item in CT, mask matches are used.
If step S5, the temperature of corresponding list item exceed threshold value, step S6 is transferred to；If it is not, being then transferred to step S7.
The temperature of corresponding list item described in this step is True beyond the Hot-Flag attributes of threshold value namely corresponding list item.
Step S6, the header packet information according to packet and corresponding list item information generate new list item and are inserted into HT, then
It is transferred to step S7.
In the embodiment of the present invention, the operation that new list item relates to update HT is inserted to HT.Because list item is to cover in CT
Code matching a, list item may match a plurality of accurate list item of a plurality of stream generation, therefore the essence for the list item generation that temperature is higher in CT
True list item (i.e. new list item) temperature may be less high, it is therefore desirable to list item in dynamic adjustment HT, is divided into the following two kinds situation：
If HT is less than being inserted directly into；If HT is full, new list item, which is replaced, is not more than 10% relatively low table of temperature in HT
, i.e., slowly it is updated.
In addition, after a certain list item generates new list item and is inserted into HT in CT, retain corresponding list item in CT, and by phase
The Hot-Flag attributes of list item are answered to be set to False, it is to avoid the accurate list item that generation is repeated.
Step S7, according to the list item processing data bag found in CT, then be transferred to step S8.
Step S8, end data packet handling process.
Such scheme of the embodiment of the present invention mainly has the following advantages that：
1) list item is accurate list item in HT, Hash can be taken to match, and list item has mask can only be by bit in CT
Matching, searches speed slowly, and the high list item of temperature in CT is changed into accurate list item storage can accelerate packet lookup speed into HT
Degree.List item is ranked up according to priority in CT, and so data packet matched to one list item can just perform corresponding operating, without
Need to travel through all list items, so as to accelerate the disposal ability of interchanger.
2) list item is set up after accurate list item is inserted into HT in CT, list item in CT is not deleted, because list item in CT
It is probably to have mask, and accurate list item may only have one, mistake can be caused by deleting list item in CT.
3) after packet reaches interchanger, HT is first searched, CT is no longer searched after matching list item is found in HT, it is to avoid
A certain list item in the lookup repeated, CT is generated after corresponding accurate list item, and the Hot-Flag of the list item is set to by we
False, it is to avoid the accurate list item that generation is repeated
Moreover, it is achieved that the Organization Chart of the above method can be found in Fig. 2.In Fig. 2, POF interchangers develop set using datum plane
Part DPDK (Data Plane Development Kit) takes over port, packet is bypassed kernel state and is directly located in User space
Reason, reduces the switching of kernel state User space and accelerates bag forwarding process.After DPDK ports receive packet, processing data packets module
HT is first looked for, if data packet matched to one list item, interchanger performs corresponding according to the instruction of list item to packet
Operation, otherwise processing data packets module continues to search for CT, if also not finding the list item of matching, processing data packets in CT
Module can inform Switch control module, Packet_In message be sent to controller by Switch control module, if in CT
The list item of matching is found, and the list item temperature is higher, and accurate list item creation module can generate an accurate table for the list item
Item is simultaneously inserted into HT.POF protocol stacks are responsible for encapsulating and parse POF message, the configuration information of database purchase interchanger, exchange
Machine control module controls the modules of interchanger.
In order to make it easy to understand, introducing flow table management process with reference to a specific example, the example is based on shown in Fig. 2
Framework realize, correctness and high efficiency can be taken into account；Key step is as follows：
(1) the every list item issued to controller, is according to priority ranked up in CT to it.
(2) whether the temperature of every list item in T at regular intervals, detection CT exceedes threshold value, the heat of such as certain list item
Degree exceedes threshold value, and its Hot-Flag just is set into True.
(3) when packet is reached, processing data packets module first looks for HT, such as finds the list item of matching, then stops searching,
Corresponding operation is performed to packet according to the list item found, the list item of matching is not found such as, then continues to search for CT, such as
In Fig. 3 shown in left figure.
(4) if also not finding the list item of matching in CT, Packet_In message is sent to controller, terminates number
According to bag handling process.If finding the packet of matching in CT, because list item is according to priority ranked up in CT, because
This also stops searching.
(5) whether the Hot-Flag for judging the list item matched in CT is True, if True, then accurate list item creates mould
Root tuber generates accurate list item according to list item information in CT and the information of the packet of matching and is inserted into HT.
(6) next identical packet can find the list item of matching in HT, and HT is matched using Hash, Ke Yijia
Fast processing data packets flow.
(7) after HT has expired, if new list item will be inserted into HT, due to we according to the temperature of list item in CT come
Decide whether to generate accurate list item, and list item is that have mask and a list item may match a plurality of stream in CT, therefore according to CT
The temperature of the accurate list item of list item generation is not more than former list item temperature, i.e., we only know the upper of the temperature of the accurate list item of generation
Limit value is without knowing its occurrence, therefore we only update 10% relatively low list item of temperature in HT, slowly update HT.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment can
To be realized by software, the mode of necessary general hardware platform can also be added to realize by software.Understood based on such,
The technical scheme of above-described embodiment can be embodied in the form of software product, the software product can be stored in one it is non-easily
The property lost storage medium (can be CD-ROM, USB flash disk, mobile hard disk etc.) in, including some instructions are to cause a computer to set
Standby (can be personal computer, server, or network equipment etc.) performs the method described in each embodiment of the invention.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (6)
1. a kind of interchanger flow table management method based on agreement unaware retransmission technique, it is characterised in that including：
When a data packet arrives, HT is first looked for, if finding the list item of matching, stops searching, and according to the list item found
Corresponding operation is performed to packet；Wherein, HT is the flow table generated according to temperature；
If not finding the list item of matching, CT is continued to search for, if the list item of matching is found, and the temperature of corresponding list item exceeds
Threshold value, then generate new list item according to the information of the header packet information of packet and corresponding list item and be inserted into HT；Wherein, CT is use
The flow table that family is issued.
2. a kind of interchanger flow table management method based on agreement unaware retransmission technique according to claim 1, it is special
Levy and be,
List item in CT is ranked up in advance according to priority；And the temperature of each list item is in T at regular intervals, detection CT
It is no to exceed threshold value η, if so, the Hot-Flag attributes of corresponding list item then are set into True.
3. a kind of interchanger flow table management method based on agreement unaware retransmission technique according to claim 2, it is special
Levy and be,
Counter difference values are calculated and obtained before and after the temperature passage time T of each list item；Counter records each list item and matched
The quantity of packet；
Described threshold value η then determines that its initial value is the average value of the temperature of all list items in CT by the way of adaptive；It
Afterwards, if HT is less than with η=min (η, ε) renewal threshold values；If HT is full, threshold value is updated with η=ε；Wherein, ε is HT
In closest to 90% position list item temperature.
4. a kind of interchanger flow table management method based on agreement unaware retransmission technique according to claim 1, it is special
Levy and be,
When searching the list item in HT, Hash matching way is used；When searching the list item in CT, mask matches are used.
5. a kind of interchanger flow table management method based on agreement unaware retransmission technique according to claim 1, it is special
Levy and be, the new list item of the generation, which is inserted into HT, to be included：
If HT is less than being inserted directly into；
If HT is full, new list item, which is replaced, is not more than 10% relatively low list item of temperature in HT.
6. a kind of interchanger flow table management method based on agreement unaware retransmission technique according to claim 1, it is special
Levy and be,
After a certain list item generates new list item and is inserted into HT in CT, retain corresponding list item in CT, and by corresponding list item
Hot-Flag attributes are set to False.
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