CN104967575B - Virtual software defines the network switch - Google Patents
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- CN104967575B CN104967575B CN201510297237.5A CN201510297237A CN104967575B CN 104967575 B CN104967575 B CN 104967575B CN 201510297237 A CN201510297237 A CN 201510297237A CN 104967575 B CN104967575 B CN 104967575B
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- 238000007781 pre-processing Methods 0.000 claims abstract description 9
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
- H04L49/354—Switches specially adapted for specific applications for supporting virtual local area networks [VLAN]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention proposes that a kind of virtual software defines the network switch, including：Preprocessing module lifts header fields and virtual switch number from data message；Multistep treatment pipelining-stage, every grade of processing pipelining-stage includes matching inquiry string extractor and wildcard rule list；Matching inquiry string extractor selects multiple fields from header fields, and multiple fields are spliced into matching inquiry string；Wildcard rule list includes three-state content addressing memory and static random addressing memory, three-state content addressing memory is stored with multirow matching rule, wildcard rule list match query rule from three-state content addressing memory according to matching inquiry string, and selected accordingly from static random addressing memory and execute corresponding instruction.The interchanger of the present invention can flexibly define the processing logic of virtual switch according to itself application demand in physical switches, and then the configuration of physical switches storage resource can be adjusted flexibly, and improve storage resource utilization ratio.
Description
Technical field
The present invention relates to software defined network technical field, more particularly to a kind of virtual software defines the network switch.
Background technology
Software defined network is the important research direction of Next Generation Internet, and software defined network area research works now
An important branch be network virtualization, by by Embeded Software define network be virtualized into multiple virtual networks and
It distributes to different virtual network users to use, to improve the utilization rate of Internet resources.
The method that the realization method of software defined network virtual switch has two classes common at present, one is pure software simulations
Realization method, it is flexibly fixed that this mode can carry out the virtual switch in virtual network according to virtual network user demand
Justice, but due to being by the way of software simulation, virtual switch processing capacity is very limited.Another kind of common method is
It is defined in traditional software and obtains different logic fragments, each logic on network physical interchanger by address space division
Fragment is used as a virtual switch.On the one hand this method limits address space workable for each virtual network,
On the other hand the Message processing flow of each virtual switch all relies on physical switches, and virtual network user cannot be to it
Flexibly defined.
Invention content
The present invention is directed to solve at least to a certain extent it is above-mentioned in the related technology the technical issues of one of.
For this purpose, it is an object of the invention to propose that a kind of virtual software defines the network switch, which can basis
Itself application demand flexibly defines the processing logic of virtual switch in physical switches, and then physics friendship can be adjusted flexibly
Storage resource of changing planes configures, and improves storage resource utilization ratio.
To achieve the goals above, the embodiment of the present invention proposes a kind of virtual software and defines the network switch, including：
Preprocessing module, for lifting header fields and virtual switch number from data message；Multistep treatment pipelining-stage, every grade of place
It includes matching inquiry string extractor and wildcard rule list to manage pipelining-stage, wherein described in the multistep treatment pipelining-stage is handled successively
Data message；The matching inquiry string extractor from the header fields for selecting multiple fields, and by the multiple word
Section is spliced into matching inquiry string；The wildcard rule list includes that three-state content addressing memory and static random address memory,
The three-state content addressing memory is stored with multirow matching rule, and the wildcard rule list is used for according to the matching inquiry string
The match query rule from the three-state content addressing memory, and addressed from the static random according to the matching rule of inquiry
Memory selects and executes corresponding instruction, wherein the matching rule often gone stores the number of the virtual switch belonging to it.
In addition, virtual software according to the above embodiment of the present invention define the network switch can also have it is following additional
Technical characteristic：
In some instances, the preprocessing module includes：Header fields extraction module, for from the data message
Extract the header fields；Virtual switch identification module, for extracting virtual switch number.
In some instances, the matching inquiry string extractor includes：Multiple input register, the multiple input deposit
Device stores the multiple field correspondingly；Multiple output registers, the multiple output register include virtual switch
Numbered register and multiple Field registers, the multiple Field registers pass through multiple selector and the multiple input respectively
Register is connected, to be spliced into the matching inquiry string to the field inputted from the multiple input register；Output module,
The output module is connected with the multiple output register, to export the matching inquiry string.
In some instances, the multiple input register is 16 bit input registers.
Virtual software according to the ... of the embodiment of the present invention defines the network switch, has the following advantages that：
1. virtual network user can flexibly define virtual switch according to itself application demand in physical switches
Handle logic；
2. virtual network user is without being concerned about that physical switches processing logic realizes details；
3. the configuration of physical switches storage resource can be adjusted flexibly by handling logic requirement according to virtual switch, raising is deposited
Store up the level of resources utilization.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the structure diagram that virtual software according to an embodiment of the invention defines the network switch；
Fig. 2 is the structural frames for the preprocessing module that virtual software according to an embodiment of the invention defines the network switch
Figure；
Fig. 3 is the matching inquiry string extractor that virtual software according to an embodiment of the invention defines the network switch
Structure diagram；
Fig. 4 is the processing flow schematic diagram that virtual software according to an embodiment of the invention defines the network switch；With
And
Fig. 5 is matching inquiry string extractor structural schematic diagram accord to a specific embodiment of that present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
Virtual software according to the ... of the embodiment of the present invention, which is described, below in conjunction with attached drawing defines the network switch.
Fig. 1 is the structure diagram that virtual software according to an embodiment of the invention defines the network switch.Such as Fig. 1 institutes
Show, which defines the network switch 1000 and include：Preprocessing module 100 and multistep treatment pipelining-stage 200.
Wherein, preprocessing module 100 is used to extract header fields and virtual switch number from data message.More have
Body, in some instances, as shown in Fig. 2, preprocessing module 100 includes：Header fields extraction module 110 and virtual switch
Identification module 120.Wherein, header fields extraction module 110 from data message for extracting header fields.Virtual switch is known
Other module 120 is for extracting virtual switch number.
Every grade of processing pipelining-stage 200 includes matching inquiry string extractor 210 and wildcard rule list 220, wherein multistep treatment
Pipelining-stage 200 handles data message successively.
Specifically, matching inquiry string extractor 210 is from header fields for selecting multiple fields, and by multiple fields
It is spliced into matching inquiry string.Further, as shown in figure 3, matching inquiry string extractor 210 includes：Multiple input register
211, multiple output registers 212 and output module 213.Specifically, multiple input register 211 store correspondingly it is more
A field.Multiple output registers 212 include virtual switch numbered register and multiple Field registers, multiple field deposits
Device is connected by multiple selector with multiple input register 211 respectively, the word that will be inputted from multiple input register 211
Section is spliced into matching inquiry string.Output module 213 is connected with multiple output registers 212, to export matching inquiry string.Wherein,
In this example, for example, multiple input register 211 is 16 bit input registers.
Wildcard rule list 220 includes that three-state content addressing memory and static random address memory, three-state content addressing
Memory is stored with multirow matching rule, and wildcard rule list according to matching inquiry string from three-state content addressing memory for looking into
Matching rule is ask, and is selected from static random addressing memory according to the matching rule of inquiry and executes corresponding instruction, wherein
The matching rule often gone stores the number of the virtual switch belonging to it.
For the ease of more fully understanding that the virtual software of the embodiment of the present invention defines the network switch, below in conjunction with Fig. 4 and
Fig. 5 with specific embodiment come to the interchanger carry out specifically, be specifically described.
As a specific example, as shown in figure 4, virtual software defines the Message processing assembly line of the network switch by multistage
Pipelining-stage composition is managed, and every grade of processing pipelining-stage is made of matching inquiry string extractor and wildcard rule list two parts.Matching is looked into
String extractor is ask to be responsible for selecting several fields in part from all fields of data message and being spliced into matching inquiry string.Wildcard
Rule list is then using matching inquiry string as input, and by query string, all list items compare one by one in rule list, and execution
With the processing action corresponding to result.Message is transmitted to next stage pipelining-stage after every grade of processing pipeline processes are complete, until most
Message is sent out assembly line by rear stage stream treatment grade.
Specifically, as shown in figure 4, data message enters processing assembly line, first pass around header fields extraction with it is virtual
The interchanger identifying processing stage.At this stage, interchanger once extracts institute's field in need from header.Virtual switch
Machine number extraction may be used increases the new newer field unrelated with virtual network agreement in messages, or the existing field of multiplexing
In such as VLAN fields realize.Then the whole header fields and virtual switch of extraction are numbered to the inquiry for being sent into pipelining-stage
String extractor.
Further, wildcard rule list addresses memory by three-state content addressing memory (TCAM) and static random
(SRAM) it realizes.Three-state content addressing memory including several row and columns, such as 800 rows, is often gone by rule list structure organization
40 bit widths.A matching rule is stored in three-state content addressing memory per a line, each can be with one in three kinds of states
Kind, be 0 respectively, 1, *, wherein " * " represents wildcard, i.e., can all match 0 can also match 1.Three-state content addressing memory
Input content is 01 Bit String isometric with line width.Three-state content addressing memory is by input string with rule in every a line by preferential
Grade is compared one by one, is addressed in memory and is taken out from static random as address according to the line number of matching rule if matching
It action command set and executes.Since multiple virtual switches need to share wildcard rule list resource, in order to which different void are isolated
The rule of quasi- interchanger needs to retain several bits in the designated position of each line discipline to store belonging to current rule virtually
The number of interchanger.Correspondingly, input matching inquiry string corresponding position should be set as current message to be inquired it is virtual
The number of interchanger.
It should be noted that the contents in table of different virtual switches is compact to the first alignment of row in wildcard rule list, remove
Virtual switch number is outer, remaining field is not required to be aligned.By compact arrangement, three-state content addressing memory can be compressed
Line width, by adjusting rule list to minimize waste of storage space.
As shown in figure 5, illustrating the structural representation of matching inquiry string extractor.Specifically, first to incoming message word
Duan Jinhang is pre-processed.All fields extracted from message field (MFLD) are different in size, need first to be segmented all fields thus,
It is divided by 16 bits, 16 bit completions is pressed less than 16 bits, it is hereby achieved that whole length are the segment of 16 bits, quantity
For N.
Wherein, query string extractor includes N number of 16 bit input register and N number of 16 bit output register, N number of segment
It is temporarily stored in N number of 16 bit input register.Each input register is connected to N number of input by a multiple selector
Register, each output register can obtain field segment from any one input register.
Different virtual switches is different in the inquiry string format that pipelining-stages at different levels are checked, matching field message bit pattern
It is stored in matching string field table, query string extractor takes out corresponding field bitmap according to virtual switch number from table.
Field bit legend should take content if any N number of unit, each corresponding output register of unit storage from which input register.
For example, a virtual switch needs extraction the 2nd and the 3rd field segment composition query string, then its field bitmap
Content is 0x02 0x03 0xff..., i.e., the number of first and second unit memory input register 2 and 3, remaining N-2
A unit storage 0xff is represented beyond all input field segment number ranges without assignment operation.
And then it by each output register dynamic assignment from the input field segment specified by virtual switch, realizes
Different virtual switches extract different query strings.And when exporting spliced matching inquiry string from output register, virtual
Interchanger number is added in matching inquiry string, is used for the rule of other virtual switches in shielding rules table.
Finally output matching inquiry string carries out interception or polishing according to the width of current pipelining-stage rule list, ensures input
String length and rule list equivalent width are inquired, matching inquiry string, which is then sent into rule list, carries out inquiry and respective handling.It tables look-up
And newer field and virtual switch number are sent to next stage by after treatment, current pipelining-stage matching inquiry string extractor
Processing.
To sum up, the virtual software of the embodiment of the present invention defines the main thought of the network switch and is summarized as follows：Due to tradition
Specific field in message is voluntarily matched per level-one on the Message processing assembly line of software defined network physical switches and is tabled look-up, and
And corresponding operating is executed according to structure of tabling look-up.In addition, the type of every coagulation matching field is manufacture in conventional switch
Setting or user configure in advance, and in the interchanger time of running, these configurations cannot change, therefore physical switches are to all reports
Text is performed both by identical processing.Based on this, the embodiment of the present invention by identifying the affiliated virtual switch of current message in advance, every grade
Assembly line matching field type is adjusted according to current corresponding virtual switch into Mobile state, to different virtual switches pair
The process flow of message is different.Also, multiple void can be accommodated simultaneously by being defined in an Embeded Software on the network switch
Quasi- interchanger, and the Message processing logic of each virtual switch is flexibly defined by virtual network user.
To sum up, virtual software according to the ... of the embodiment of the present invention defines the network switch, has the following advantages that：
1. virtual network user can flexibly define virtual switch according to itself application demand in physical switches
Handle logic；
2. virtual network user is without being concerned about that physical switches processing logic realizes details；
3. the configuration of physical switches storage resource can be adjusted flexibly by handling logic requirement according to virtual switch, raising is deposited
Store up the level of resources utilization.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (3)
1. a kind of virtual software defines the network switch, which is characterized in that including：
Preprocessing module, for extracting header fields and virtual switch number from data message；
Multistep treatment pipelining-stage, every grade of processing pipelining-stage includes matching inquiry string extractor and wildcard rule list, wherein described more
Grade processing pipelining-stage handles the data message successively；
The matching inquiry string extractor splices the multiple field for selecting multiple fields from the header fields
For matching inquiry string, the matching inquiry string extractor includes：
Multiple input register, the multiple input register store the multiple field correspondingly；
Multiple output registers, the multiple output register include virtual switch numbered register and the deposit of multiple fields
Device, the multiple Field registers are connected by multiple selector with the multiple input register respectively, will be come from described
The field of multiple input register input is spliced into the matching inquiry string；
Output module, the output module are connected with the multiple output register, to export the matching inquiry string；
The wildcard rule list includes three-state content addressing memory and static random addressing memory, the three-state content addressing
Memory is stored with multirow matching rule, and the wildcard rule list according to the matching inquiry string from the ternary content for seeking
Match query rule in the memory of location, and select and execute from static random addressing memory according to the matching rule of inquiry
Corresponding instruction, wherein the matching rule often gone stores the number of the virtual switch belonging to it.
2. virtual software according to claim 1 defines the network switch, which is characterized in that the preprocessing module packet
It includes：
Header fields extraction module, for extracting the header fields from the data message；
Virtual switch identification module, for extracting virtual switch number.
3. virtual software according to claim 1 defines the network switch, which is characterized in that the multiple input register
For 16 bit input registers.
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| CN110036610B (en) * | 2016-12-07 | 2020-10-16 | 华为技术有限公司 | Method and switch for route management in software defined network |
| CN109474641B (en) * | 2019-01-03 | 2020-05-12 | 清华大学 | Reconfigurable switch forwarding engine resolver capable of destroying hardware trojans |
| US11658837B2 (en) * | 2020-07-10 | 2023-05-23 | Realtek Semiconductor Corp. | Multicast packet replication method |
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| CN102427428A (en) * | 2011-12-07 | 2012-04-25 | 西安电子科技大学 | Stream identifying method and device based on multi-domain longest match |
| CN103248573A (en) * | 2013-04-08 | 2013-08-14 | 北京天地互连信息技术有限公司 | Centralization management switch for OpenFlow and data processing method of centralization management switch |
| CN103684905A (en) * | 2013-11-27 | 2014-03-26 | 北京邮电大学 | Flow rule conflict detection and processing method for network virtualization platform |
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| US7840696B2 (en) * | 2003-07-25 | 2010-11-23 | Broadcom Corporation | Apparatus and method for classifier identification |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102427428A (en) * | 2011-12-07 | 2012-04-25 | 西安电子科技大学 | Stream identifying method and device based on multi-domain longest match |
| CN103248573A (en) * | 2013-04-08 | 2013-08-14 | 北京天地互连信息技术有限公司 | Centralization management switch for OpenFlow and data processing method of centralization management switch |
| CN103684905A (en) * | 2013-11-27 | 2014-03-26 | 北京邮电大学 | Flow rule conflict detection and processing method for network virtualization platform |
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