CN109995674A - A kind of programmable SDN switch system - Google Patents
A kind of programmable SDN switch system Download PDFInfo
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- CN109995674A CN109995674A CN201711472210.0A CN201711472210A CN109995674A CN 109995674 A CN109995674 A CN 109995674A CN 201711472210 A CN201711472210 A CN 201711472210A CN 109995674 A CN109995674 A CN 109995674A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/23—Bit dropping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/622—Queue service order
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
- H04L49/9063—Intermediate storage in different physical parts of a node or terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Abstract
The invention discloses a kind of programmable SDN switch systems.Present system includes: header parser module, matching-action module and queue scheduling module.System of the invention, interchanger is set to carry out header parser, information extraction and data manipulation according to the parsing strategy that controller is formulated, so that interchanger parsing module, matching-action module is provided with the programmable ability of software implementation, can realize the update of switch function without changing hardware.
Description
Technical field
The present invention relates to network technique field, more particularly to a kind of programmable SDN switch system.
Background technique
With the development of SDN technology, the agreement of traditional SDN, if OpenFlow is improved in evolutionary process gradually, matching
Tuple and type of action constantly increase.Interchanger is faced in the version updating for supporting OpenFlow agreement and tradition is handed over
The same predicament of exchange device manufacturer --- OpenFlow does not support flexibly to change matching tuple and type of action.With network
In new agreement continuously emerge, OpenFlow agreement will also become more and more too fat to move, and the extension of matching-action schedule becomes more next
It is more difficult.Therefore, it allows data forwarding plane that also there is programmability, allows the parsing of data packet and forwarding process that can also pass through volume
Limitation of the hardware device to data Forwarding plane has been broken in process control, becomes the trend of SDN technology development of new generation.
To support P4 language to provide this ability, such interchanger use as the programmable switch of representative for user
With-action model, by programmable resolver and matching-action schedule, enable switch to by way of software implementation into
The update of row function.But control layer mainly calls P4 language by southbound interface to the control of programmable switch at present
The API that compiling generates is carried out.Since the switch function of compiled completion and interface are it has been determined that in practice for control layer
For, the function of interchanger is still fixed, therefore there is no the control advantages for realizing full software implementation to the greatest extent.The present invention
By the improvement to interchanger header parser device, enable the controller to completely realize the function to interchanger by way of configuring
It can control, the advantage that switch software defines can be played to greatest extent, make data Layer really and complete software may be implemented
Change.
Summary of the invention
In order to solve the above technical problems, the present invention proposes a kind of programmable SDN switch system, by parsing mould
The configurable software implementation design of block, matching movement-module, carries out interchanger according to the parsing strategy that controller is formulated
Header parser, information extraction and data manipulation make interchanger be provided with the programmable ability of software implementation, can without changing hardware
To realize the update of switch function.
The present invention adopts the following technical scheme:
A kind of programmable SDN switch system, comprising:
Header parser module, the data packet head for receiving to programmable SDN switch parse, and extract data packet
The matching tuple information of head, and matching-action module is sent by the matching tuple information；
Matching tuple content in matching-action module, matching tuple information for that will extract and matching-action schedule into
Row matching is then handled according to the movement in the matching list item if there is matched list item；
Queue scheduling module, for being issued after being scheduled to the transmission data being buffered in individual queue from interchanger.
The header parser module, comprising:
Header parser configures interface, the parsing configuration information sent for receiving controller, and the parsing is configured
Information is stored into resolution table；
Resolution table, for storing header parser list item, every list item corresponds to a kind of header parser and information extraction strategy, packet
Header parsing list item includes parsing ID and parsing tuple；
Resolution executing is searched in resolution table for the parsing ID of read data packet according to the parsing ID of data packet
Matched list item carries out parsing and information extraction, the packet header that will be extracted to data packet according to the parsing tuple in matching list item
Information is sent to matching-action module as matching tuple information.
The parsing configuration information includes header parser list item.
The resolution table, comprising:
ID is parsed, for distinguishing the header parser and information extraction strategy of data flow；
Tuple is parsed, the content of header parser and information extraction is used to indicate；Tuple is parsed by one or more parsing member
Element composition, each information parsed in element representation packet header；Each parsing element by TLV (Type, length,
Value) format is expressed, and Type indicates parsing tuple name, and Length indicates that parsing tuple length, Value indicate parsing tuple
In the position in packet header.
Matching-the action module, comprising:
Matching-movement configures interface, the matching-movement configuration information sent for receiving controller, and store to
With in-action schedule；
Matching-action schedule, for storing matching-movement list item, every list item includes: matching tuple and movement；
Matching-action execution unit, the matching tuple information for being sent according to header parser module,
With matched list item is searched in-action schedule, data packet is handled according to the movement content in matching list item, is sent to queue
Scheduler module.
The matching-movement configuration information includes storage matching-movement list item.
Matching-the action schedule includes:
Match tuple, including element corresponding with parsing element in parsing tuple；
Movement, for the operation to data packet.
The queue scheduling module, comprising:
Queue configures interface, the queue configuration information sent for receiving controller, and is configured to buffer queue and team
Column scheduling unit；
Buffer queue, for caching the data packet of each queue in port；
Scheduling unit, the queue scheduling side for being configured to the data packet in the buffer queue according to queue configuration information
Formula carries out the arrangement of transmission sequence；
Transmission unit, for data to be sent after the completion of buffer scheduling etc., and by successively sending out interchanger.
The queue configuration information includes port name, queued name, number of queues, queue scheduling mode.
A kind of analytic method of programmable SDN switch, comprising the following steps:
Header parser module, the data packet head received to programmable SDN switch parse, and extract data packet head
Tuple information is matched, and sends matching-action module for the matching tuple information；
Matching-action module, by the matching tuple content progress in the matching tuple information of extraction and matching-action schedule
Match, if there is matched list item, is then handled according to the movement in the matching list item；Otherwise, abandon or be sent to control
Device processed；
Queue scheduling module issues after being scheduled to the transmission data being buffered in individual queue from interchanger.
Beneficial effect and advantage of the present invention are as follows:
1. system of the invention allows interchanger to carry out header parser, information according to the parsing strategy that controller is formulated
Extraction and data manipulation, make interchanger parsing module, matching-action module be provided with the programmable ability of software implementation, are not necessarily to
Change hardware can realize the update of switch function.
2. system through the invention, interchanger header parser and matching-movement can be according to transmission being customized of data
Processing, can be improved data processing forwarding efficiency.
Detailed description of the invention
Fig. 1 is the schematic diagram of one embodiment of a kind of programmable SDN switch of the invention and affiliated SDN network system；
Fig. 2 is a kind of structural schematic diagram of one embodiment of programmable SDN switch system of the present invention.
Fig. 3 a is the schematic diagram of resolution table of the present invention；
Fig. 3 b is a kind of schematic diagram of one embodiment of programmable SDN switch system of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, one embodiment of a kind of programmable SDN switch of the invention and affiliated SDN network system is shown
Schematic diagram, SDN overall network system is divided into two levels, control layer and data Layer.
Control layer is made of one or more distributed controllers, according to the transmission demand of terminal device, formulates data
Transmission strategy is converted into configuration (distribution as parsed ID) and the data Layer of the edge device in control domain by the transmission strategy of stream
The configuration (formulation, the formulation of matching-movement configuration information as parsed configuration information) of equipment；
Data Layer is made of multiple programmable SDN switches and terminal device, wherein programmable SDN switch reception pipe
The parsing configuration information and matching-movement configuration information for managing device carry out parsing and packet header to data packet according to parsing configuration information
Information extraction carries out operation processing to data packet according to matching-movement configuration information.
Edge device is responsible for data stream, for adding or deleting manager distribution in the packet header of corresponding data stream
Parse ID label.
Terminal device is the generation of network data and receives terminal, for sending controller, and exchange for transmission demand
Machine data send and receive.
Referring to fig. 2, a kind of structural schematic diagram of one embodiment of programmable SDN switch system of the present invention is shown,
The system includes: header parser module 210, matching-action module 220, queue scheduling module 230.
Header parser module 210, the data packet head for receiving to programmable SDN switch parse, and extract number
Matching-action module is sent to according to the matching tuple information in packet header, and by the matching tuple information.It specifically includes:
Resolution table, for storing header parser list item, every list item corresponds to a kind of header parser and information extraction strategy (should
Strategy is formulated by controller according to data stream transmitting demand), parameter includes parsing ID and parsing tuple；
Header parser entry status information may include the effective time of header parser list item, creation time etc.；
Resolution table status information may include parsing table name, resolution table maximum list item capacity, and list item includes in resolution table
Element and data type etc.；
Parsing configuration information includes header parser list item, header parser entry status information and parsing table status information.
Referring to Fig. 3 a, the schematic diagram of resolution table is shown.Wherein:
ID is parsed, for distinguishing the header parser and information extraction strategy of data flow.The parsing ID of data flow is by SDN network
The parsing ID of distribution is added in data flow packet header by controller distribution when data flow passes through network edge device.Parse ID
Position in the header can be any position in packet header, and such as 2byte before packet header, but the position needs edge device and exchange
Machine agreement is unified.
Tuple is parsed, the content of header parser and information extraction is used to indicate.Tuple is parsed by one or more parsing member
Element composition, each information parsed in element representation packet header, if purpose IP address is exactly a parsing element.Each parsing
Element is expressed by TLV (Type, length, Value) format, and Type indicates parsing tuple name, and Length indicates parsing member
Group length, Value indicate parsing tuple in the position (offset) in packet header.
Referring to Fig. 3 b, the schematic diagram of one embodiment of resolution table is shown.
In first list item, parsing ID is 1, and parsing includes 4 parsing elements { dst MAC, 6,8 } in tuple；{src
MAC,6,14}；{src IP,4,26}；{dst IP,4,30}；Indicate this parse strategy by extract packet header source MAC,
Target MAC (Media Access Control) address, source IP address, purpose IP address.The data packet for being 1 for parsing ID will all execute this and parse strategy.
Controller can need to formulate the parsing strategy of data packet head according to specific transmission, be subsequently sent to interchanger,
Interchanger carries out header parser and information extraction according to the parsing strategy that controller is formulated, and is provided with interchanger parsing module soft
The programmable ability of partization.
Resolution executing, for the parsing ID of read data packet, according to the parsing ID of the data packet in resolution table
Matched list item is searched, parsing and information extraction are carried out to data packet according to the parsing tuple in matching list item, by what is extracted
The header packet information is sent to matching-action module as matching tuple information.
When interchanger receives data, the parsing ID in packet header is extracted first, and matching is searched in resolution table according to parsing ID
List item.
Parsing list item parsing tuple formulated by SDN network controller, when interchanger according to parsing ID find it is matched
After list item, successively according to the offset and length in the TLV expression of each element in parsing tuple, specified number is found in the header
According to extracting the numerical value that the data save as corresponding title.Parsing tuple extraction information will be dynamic in matching-as matching tuple information
Make the lookup that corresponding actions are carried out in table.
Header parser configures interface, the parsing configuration information sent for receiving controller, and the parsing is configured
Information is stored into resolution table.
Controller send parsing configuration information at least need include data flow parsing ID with parse tuple information, other
Configuration information can be extended according to specific demand for control.
Matching-action module 220, for the matching in the matching tuple information of the extraction and matching-action schedule is first
Group content is matched, and if there is matched list item, is then handled according to the movement in the matching list item；
Matching-action schedule, for storing matching-movement list item, every list item includes: matching tuple and movement；
Wherein, each element matched in tuple should be corresponding with each element in parsing tuple.
Matching-action execution unit, the matching tuple information for being sent according to header parser module,
With matched list item is searched in-action schedule, data packet is handled according to the movement content in matching list item.
Matching-movement configures interface, the matching-movement configuration information sent for receiving controller, and matches by described in
Confidence breath storage is into matching-action schedule.
Matching-movement configuration information includes that storage matching-movement list item, matching-movement entry status information and matching-are dynamic
Make table status information.
Matching-action schedule includes:
Tuple information is matched, it may include MAC purpose that the element matched in tuple should be corresponding with element in parsing tuple
Address (Destination Mac Address), mac source address (Source Mac Address), protocol type (Type), excellent
First grade (Priority Code Point), No. Vlan (VLAN ID), IP source address (Source Ip Address), IP purpose
Address (Destination Ip Address), DSCP (Dscp), protocol fields (Protocol), source port (Source
Port), destination port (Destination Port).
Movement, the operation to data packet, may include being forwarded to queue, be forwarded to port, and packet header modification abandons, forwarding
To controller.
Queue scheduling module 230, for being issued after being scheduled to the transmission data being buffered in individual queue from interchanger.
Buffer queue, for caching the data packet of each queue in port.
Scheduling unit, for the data packet in the buffer queue according to queue configuration interface configuration scheduling mode into
The arrangement of row transmission sequence.
Transmission unit, for data to be sent after the completion of buffer scheduling etc., and by successively sending out interchanger；
Queue configures interface, the queue configuration information sent for receiving controller, and is configured to buffer queue and team
Column scheduling unit.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of programmable SDN switch system characterized by comprising
Header parser module, the data packet head for receiving to programmable SDN switch parse, and extract data packet head
Tuple information is matched, and sends matching-action module for the matching tuple information；
Matching-action module, the matching tuple information for that will extract and the matching tuple content progress in matching-action schedule
Match, if there is matched list item, is then handled according to the movement in the matching list item；
Queue scheduling module, for being issued after being scheduled to the transmission data being buffered in individual queue from interchanger.
2. a kind of programmable SDN switch system according to claim 1, which is characterized in that the header parser module,
Include:
Header parser configures interface, the parsing configuration information sent for receiving controller, and by the parsing configuration information
It stores in resolution table；
Resolution table, for storing header parser list item, every list item corresponds to a kind of header parser and information extraction strategy, packet header solution
Analysis list item includes parsing ID and parsing tuple；
Resolution executing searches matching according to the parsing ID of data packet for the parsing ID of read data packet in resolution table
List item, according to matching list item in parsing tuple to data packet carry out parsing and information extraction, the header packet information that will be extracted
As matching tuple information, it is sent to matching-action module.
3. a kind of programmable SDN switch system according to claim 2, which is characterized in that the parsing configuration information
Including header parser list item.
4. a kind of programmable SDN switch system according to claim 2, which is characterized in that the resolution table, comprising:
ID is parsed, for distinguishing the header parser and information extraction strategy of data flow；
Tuple is parsed, the content of header parser and information extraction is used to indicate；It parses tuple and element group is parsed by one or more
At each information parsed in element representation packet header；Each parsing element passes through TLV (Type, length, Value) lattice
Formula expression, Type indicate parsing tuple name, and Length indicates that parsing tuple length, Value indicate parsing tuple in packet header
Position.
5. a kind of programmable SDN switch system according to claim 1, which is characterized in that the matching-movement mould
Block, comprising:
Matching-movement configures interface, the matching-movement configuration information sent for receiving controller, and stores dynamic to matching-
Make in table；
Matching-action schedule, for storing matching-movement list item, every list item includes: matching tuple and movement；
Matching-action execution unit, the matching tuple information for being sent according to header parser module are dynamic in matching-
Make to search matched list item in table, data packet is handled according to the movement content in matching list item, is sent to queue scheduling
Module.
6. a kind of programmable SDN switch system according to claim 1, which is characterized in that the matching-movement configuration
Information includes storage matching-movement list item.
7. a kind of programmable SDN switch system according to claim 1, which is characterized in that the matching-action schedule packet
It includes:
Match tuple, including element corresponding with parsing element in parsing tuple；
Movement, for the operation to data packet.
8. a kind of programmable SDN switch system according to claim 1, which is characterized in that the queue scheduling module,
Include:
Queue configures interface, the queue configuration information sent for receiving controller, and is configured to buffer queue and queue tune
Spend unit；
Buffer queue, for caching the data packet of each queue in port；
Scheduling unit, queue scheduling mode for configuring to the data packet in the buffer queue according to queue configuration information into
The arrangement of row transmission sequence；
Transmission unit, for data to be sent after the completion of buffer scheduling etc., and by successively sending out interchanger.
9. a kind of programmable SDN switch system according to claim 1, which is characterized in that the queue configuration information
Including port name, queued name, number of queues, queue scheduling mode.
10. a kind of analytic method of programmable SDN switch, which comprises the following steps:
Header parser module, the data packet head received to programmable SDN switch parse, and extract the matching of data packet head
Tuple information, and matching-action module is sent by the matching tuple information；
Matching-action module matches the matching tuple information of extraction with the matching tuple content in matching-action schedule,
If there is matched list item, then handled according to the movement in the matching list item；Otherwise, abandon or be sent to control
Device；
Queue scheduling module issues after being scheduled to the transmission data being buffered in individual queue from interchanger.
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