CN105933162B - Low time delay ethernet repeater and method based on T-type structure - Google Patents
Low time delay ethernet repeater and method based on T-type structure Download PDFInfo
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2801—Broadband local area networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/25—Routing or path finding in a switch fabric
- H04L49/252—Store and forward routing
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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
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Abstract
The present invention proposes a kind of low time delay ethernet repeater and method based on T-type structure, for solving existing for existing switch, time delay existing for wiring redundancy issue and existing retransmission method is larger and time delay uncertain problem, transponder includes port and the processing unit of T-shaped distribution, and processing unit includes: left port frame processing module, right output port frame processing module, user port frame processing module, address learning and searching module, specialized protocol processing module and user port adaptation module；Retransmission method includes: link state judgement, and data cached frame, frame identifies classification, rebuilds link, and PAUSE frame classification configures transponder, address learning and lookup, establishes output queue, sets up PAUSE frame, output to port.The present invention can be substantially reduced user's access wiring redundancy, reduce Forwarding Delay and guarantee that Forwarding Delay determines, and detect establishing network link of laying equal stress in time in network link failure, can be used for setting up high speed access network in real time.
Description
Technical field
The invention belongs to field of communication technology, it is related to a kind of forwarded device and retransmission method, and in particular to Yi Zhongji
In the low time delay Ethernet retransmission unit and method of T-type structure, it can be used for setting up high speed access network in real time.
Background technique
Ethernet is internetwork connection mode common in local area network, and user generally first accesses switching equipment in a network, such as
Switch or router, then other networks are connected to by switching equipment.Ethernet switch seeks to fill that multi-user while accessing
The demand of data exchange when network, traditional ethernet interchanger are usually multi port switch, when multiple access interchanger, are adopted
To the star net forming mode centered on interchanger, each user requires the use that interchanger is connected to by an independent cable
Family interface requires to be routed succinct occasion, such as in aircraft, high-speed rail environment, redundancy is routed brought by star net forming some
Problem will be difficult to receive.
Traditional ethernet interchanger generallys use store and forward message mode, and forwarding process is as follows:
(1) input processing, the main reception for completing data frame, verification, data format matched function；
(2) flow point class and packet transaction are mainly used for extracting frame critical field information, and according to the information to ether netting index
Classify according to frame, executes corresponding processing according to classification results；
(3) address learning and address search, are learnt according to source MAC and source port number, then according to purpose MAC
Address carries out address search, obtains destination port；
(4) it joins the team, according to information such as destination slogan and priority, distributes buffer address for data frame, and be deposited into
Corresponding output queue；
(5) go out team, according to scheduling information, inquire the buffer address where group frame, and remove it output queue；
(6) output is handled, the main data frame buffer memory and the matched function of data frame format completed at output port；
Wherein input-buffer, join the team and export caching and etc. in all data frame can completely be cached, lead to data
The Forwarding Delay of frame is larger, and since the length of data frame is not fixed, and the Forwarding Delay that interchanger introduces has not really
It is qualitative.
Summary of the invention
It is an object of the invention to overcome defect existing for traditional ethernet switching technology, propose a kind of based on T junction
The low time delay Ethernet retransmission unit and method of structure, for solve existing for existing switch wiring redundancy, time delay it is larger and when
Prolong uncertain problem.
To achieve the goals above, technical thought of the invention are as follows: forwarded with traditional ethernet interchanger only with storage
Mode is compared, and the present invention uses two kinds of forward modes: straight-through forward mode and store and forward message mode, when output port is clog-free
When, for interchanger using straight-through forward mode, interchanger starts data frame after receiving the ethernet type field of data frame at once
Lookup forwarding, entire repeating process caches complete data frame due to not needing, ensure that repeating process it is low when
Prolong, and since the length of the partial data frame of caching is fixed, guarantees the certainty of Forwarding Delay；When output port blocks
When, interchanger uses store and forward message mode, and interchanger exports poll after data frame buffer memory to output port.
To achieve the above object, the present invention is based on the low time delay ethernet repeaters of T-type structure, including port and processing list
Member, it is characterised in that:
The port, using T-type distributed architecture, i.e. respectively left port, right output port and user port, left port and right end
Mouth is the network port, and for connecting the network equipment, user port is accessed for user terminal；
The processing unit, comprising:
Left port frame processing module, for receiving the data frame, right output port frame processing module and the user that input at left port
The data frame of port frame processing module output, and extract the source port and source MAC address information feeding of left port input data frame
Address learning and searching module；
Right output port frame processing module, for receiving the data frame, left port frame processing module and the user that input at right output port
The data frame of port frame processing module output, and extract the source port and source MAC address information feeding of right output port input data frame
Address learning and searching module；
User port frame processing module, for receiving at user port adaptation module at the data frame, left port frame of input
The data frame of module and the output of right output port frame processing module is managed, and extracts the source port of user port adaptation module input data frame
Address learning and searching module are sent into source MAC address information；
Address learning and searching module, for according to left port frame processing module, right output port frame processing module and user terminal
Mouth frame processing module is sent into the source port of data frame and source MAC address information establishes address table, and is counted by address search
According to the destination port of frame；
Specialized protocol processing module, for receiving the dedicated association at left port frame processing module and right output port frame processing module
Frame is discussed, and the configuration and management to transponder are realized according to specialized protocol frame；
User port adaptation module, for the user input data at user port to be converted to data frame used in transponder
It is sent into user port frame processing module, and realizes Ethernet 10/100/1000M adaptation function.
To achieve the above object, the present invention is based on the low time delay Ethernet retransmission methods of T-type structure, including；
1) data reception step:
1.1) network link situation is judged according to the connection status in PHY chip register: if PHY chip connection status is
ON, then link is normal, executes step 1.2), if PHY chip connection status is OFF, link failure executes step 1.4)；
1.2) cross clock domain processing is carried out to the asynchronous data frame of input, obtains synchrodata frame, cache synchronization data frame
To the field of ethernet type domain, step 1.3) is executed；
1.3) its target MAC (Media Access Control) address, source MAC and type domain information are extracted from the cache contents of synchrodata frame,
Judge the type of the synchrodata frame: if synchrodata frame for PAUSE frame, executes step 1.5), if synchrodata frame is dedicated
Protocol frame, the i.e. ethernet frame of self defined class offset execute step 1.6), if synchrodata frame is normal data frame, execute step
It is rapid 1.7)；
1.4) it rebuilds link and generates network link failure information alert frame:
Address table 1.4a) is emptied, and address table is re-established by address learning, realizes that network link is rebuild；
1.4b) building network link failure information alerts frame, and the frame is sent into non-faulting port, executes sending step
2)；
1.5) judge the type of PAUSE frame: if PAUSE frame is off frame, after the output flow for stopping port, abandoning
The PAUSE frame after the output flow at unlatching port, abandons the PAUSE frame if PAUSE frame is wake-up association；
1.6) corresponding configuration and management are carried out to transponder according to the content of specialized protocol frame, and judges the specialized protocol
Whether frame, which needs, forwards, and if necessary to forward, then enters data sending step 2), otherwise abandon；
1.7) address learning is carried out according to the source MAC of normal data frame and source port number, and according to normal data frame
Target MAC (Media Access Control) address search destination port, into data sending step 2)；
2) data sending step:
2.1) three queues are established at destination port, store other two ports data frame to be sent and pending respectively
The PAUSE frame sent, and judge the storage state of data frame queue: if data frame queue storage reaches warning line, then follow the steps
2.2), no to then follow the steps 2.3)；
2.2) it sets up PAUSE and stops frame, and PAUSE stopping frame being passed to and reaches end corresponding to the queue of warning line
Mouth is sent；
2.3) three queues in poll output 2.1) preferentially export specialized protocol if there is specialized protocol frame to be sent
Frame.
Compared with prior art, the present invention having the advantage that
First, the present invention due to using T-type structure, realized by transponder cascade more again by user accessing user port first
The network insertion of user, and conventional switch realizes the network insertion of multi-user using stelliform connection topology configuration, therefore the present invention is big
Reduce the wiring redundancy issue of user's access greatly.
Second, the present invention extracts number since input processing does not cache data frame completely, when as long as receiving data frame
Can be carried out searching forwarding according to the type field of frame, and without joining the team, go out team, can work when exporting clog-free
Make under direct mode operation, greatly reduce Forwarding Delay, and since the length of the partial data frame of caching is fixed, guarantees forwarding
The certainty of time delay.
Third, the present invention is since when network link breaks down, address search and study module can be by emptying address
Table, and address table is retrieved by address learning, it realizes that network link is rebuild, enhances the reliability of network.
Detailed description of the invention
Fig. 1 is the overall structure block diagram of apparatus of the present invention；
Fig. 2 is the structural block diagram of apparatus of the present invention processing unit；
Fig. 3 is the structural block diagram of apparatus of the present invention left port frame processing module；
Fig. 4 is the structural block diagram of apparatus of the present invention right output port frame processing module；
Fig. 5 is the structural block diagram of apparatus of the present invention user port frame processing module；
Fig. 6 is the data receiver flow diagram of retransmission method of the present invention；
Fig. 7 is the data transmission flow block diagram of retransmission method of the present invention.
Specific embodiment
Below in conjunction with drawings and examples, invention is further described in detail.
Referring to Fig.1, apparatus of the present invention include three ports and a processing unit, and three ports are respectively left port, the right side
Port and user port, three T-shaped distributions in port, wherein left port and right output port are the network port, and the network port uses
Gigabit ethernet interface, user port can be the port of multiple interfaces agreement, and two network ports are for apparatus of the present invention
Interconnection is connected with external network, and user port is for connecting user.
Referring to Fig. 2, the processing unit of apparatus of the present invention includes: left port frame processing module 1, right output port frame processing module 2,
User port frame processing module 3, address learning and searching module 4, specialized protocol processing module 5, user port adaptation module 6.
The left port frame processing module 1, for receive left port data frame and extract data frame target MAC (Media Access Control) address,
Target MAC (Media Access Control) address therein and source MAC are sent to address learning and searching module 4 by source MAC and type, will be dedicated
Protocol frame is sent to specialized protocol processing module 5；Receive the output of right output port frame processing module 2 and user port frame processing module 3
Data frame is simultaneously exported to left port.
The right output port frame processing module 2, for receive right output port data frame and extract data frame target MAC (Media Access Control) address,
Target MAC (Media Access Control) address therein and source MAC are sent to address learning and searching module 4 by source MAC and type, will be dedicated
Protocol frame is sent to specialized protocol processing module 5；Receive the output of left port frame processing module 2 and user port frame processing module 3
Data frame is simultaneously exported to left port.
The user port frame processing module 3, for receiving user port data frame and extracting the purpose MAC of data frame
Target MAC (Media Access Control) address therein and source MAC are sent to address learning and searching module 4 by location, source MAC and type, are received
The output data frame of left port frame processing module 2 and right output port frame processing module 3 is simultaneously exported to left port.
The address learning and searching module 4, establish address table using the source port and source MAC address information of data frame,
Address search is carried out using the target MAC (Media Access Control) address of data frame and obtains the destination port of data frame, after network link failure
Network link rebuilds the address table that instruction empties transponder, and re-establishes address table by address learning, realizes network link
It rebuilds.
The specialized protocol processing module 5 is used for according to specialized protocol frame, the i.e. ethernet frame of self defined class offset, real
Network link failure information and other ports now to the configuration of transponder and management, and for receiving and parsing the port turn
The network link failure information alert frame sent generates network link and rebuilds instruction, and the network link is rebuild instruction and is sent
To address learning and searching module 4, and building network link failure information alerts frame, waits the frame processing of the non-faulting network port
Module polls forwarding.
The user port adaptation module 6, since the user data at user port may be with data frame used in transponder
Difference needs to be converted to the user input data at user port data frame used in transponder and is sent into user port frame processing mould
Block 3, and realize Ethernet 10/100/1000M adaptation function.
Above-mentioned left port frame processing module 1, right output port frame processing module 2 and user port frame processing module 3 are connected with each other,
Address learning and searching module 4 are handled with left port frame processing module 1, right output port frame processing module 2 and user port frame respectively
Module 3 is connected, and specialized protocol processing module 5 is connected with left port frame processing module 1 and right output port frame processing module respectively, user
Port adaptation module 6 is connected with user port frame processing module 3.
Referring to Fig. 3, left port frame processing module 1 of the invention includes: input processing submodule 11, frame identification submodule
12, flow control submodule 13 and output processing submodule 14.
Fault message is sent to dedicated association for detecting possible network link failure by the input processing module 11
Discuss processing module 5；By using asynchronous FIFO eliminate data frame cross clock domain metastable issues, receive and data cached frame extremely
Ethernet type domain field, and the data frame partial bytes of caching are sent to frame identification module 12.
The frame identification module 12, the partial data frame for being cached according to input processing module 11 extract the mesh of data frame
MAC Address, source MAC and frame type, and judge extracted frame type:
It is normal frames if it is data frame, then sends request of tabling look-up to address learning and searching module 4, obtains destination
Mouthful, then destination port is judged: if destination port is right output port, the output processing that normal frames are sent to right output port is sub
The output that normal frames are sent to user port is handled submodule 34 if destination port is user port by module 24；
If data frame is PAUSE frame, PAUSE frame is sent to flow control submodule 13；
If it is specialized protocol frame, then the frame is sent to specialized protocol processing module 5.
The flow-control module 13, for realizing flow control according to the storage state of the data frame queue at destination port
System sets up PAUSE and stops frame when data frame queue reaches warning line, at the end of flow control, sets up PAUSE wake-up association, and will
The PAUSE wake-up association or PAUSE stop the output processing module that frame is sent at corresponding ports and are forwarded；And it parses and is identified from frame
The PAUSE frame that module 11 is sent extracts flow-control information, and flow-control information is sent to output processing module 14.
The output processing module 14, the data frame and protocol frame sent for receiving other two ports, and delay respectively
There are in two data frame queues and PAUSE frame queue, successively two data frame queues of poll and PAUSE frame queue are sent out
It send, if specialized protocol processing module 3 has network link failure information alert frame, preferentially sends the network link failure information
Alert frame；And for receiving the flow-control information that flow-control module 13 is sent, if it is flow control Stop message, then send current
After data frame, stop polling data frame queue, at the end of receiving flow control and waking up information or flow control, restarts polling data
Frame queue.
Referring to Fig. 4, right output port frame processing module 2 of the invention includes: input processing submodule 21, frame identification submodule
22, flow control submodule 23 and output processing submodule 24.
Fault message is sent to dedicated association for detecting possible network link failure by the input processing module 21
Discuss processing module 5；By using asynchronous FIFO eliminate data frame cross clock domain metastable issues, receive and data cached frame extremely
Ethernet type domain field, and the data frame partial bytes of caching are sent to frame identification module 22.
The frame identification module 22, the partial data frame for being cached according to input processing module 21 extract the mesh of data frame
MAC Address, source MAC and frame type, and judge extracted frame type:
It is normal frames if it is data frame, then sends request of tabling look-up to address learning and searching module 4, obtains destination
Mouthful, then destination port is judged: if destination port is left port, the output processing that normal frames are sent to right output port is sub
The output that normal frames are sent to user port is handled submodule 34 if destination port is user port by module 14；
If data frame is PAUSE frame, PAUSE frame is sent to flow control submodule 23；
If it is specialized protocol frame, then the frame is sent to specialized protocol processing module 5.
The flow-control module 23, for realizing flow control according to the storage state of the data frame queue at destination port
System sets up PAUSE and stops frame when data frame queue reaches warning line, at the end of flow control, sets up PAUSE wake-up association, and will
The PAUSE wake-up association or PAUSE stop the output processing module that frame is sent at corresponding ports and are forwarded；And it parses and is identified from frame
The PAUSE frame that module 21 is sent extracts flow-control information, and flow-control information is sent to output processing module 24.
The output processing module 14, the data frame and protocol frame sent for receiving other two ports, and delay respectively
There are in two data frame queues and PAUSE frame queue, successively two data frame queues of poll and PAUSE frame queue are sent out
It send, if specialized protocol processing module 3 has network link failure information alert frame, preferentially sends the network link failure information
Alert frame；And for receiving the flow-control information that flow-control module 23 is sent, if it is flow control Stop message, then send current
After data frame, stop polling data frame queue, at the end of receiving flow control and waking up information or flow control, restarts polling data
Frame queue.
Referring to Fig. 5, user port frame processing module 3 of the invention includes: input processing submodule 31, frame identification submodule
32, flow control submodule 33 and output processing submodule 34.
The input processing module 31 is eliminated the metastable issues of data frame cross clock domain by using asynchronous FIFO, connect
It receives and data cached frame is to ethernet type domain field, and the data frame partial bytes of caching are sent to frame identification module 32.
The frame identification module 32, the partial data frame for being cached according to input processing module 31 extract the mesh of data frame
MAC Address, source MAC and frame type, and judge extracted frame type:
It is normal frames if it is data frame, then sends request of tabling look-up to address learning and searching module 4, obtains destination
Mouthful, then destination port is judged: if destination port is left port, the output processing that normal frames are sent to right output port is sub
The output that normal frames are sent to user port is handled submodule 24 if destination port is right output port by module 14；
If data frame is PAUSE frame, PAUSE frame is sent to flow control submodule 33；
The flow-control module 33, for realizing flow control according to the storage state of the data frame queue at destination port
System sets up PAUSE and stops frame when data frame queue reaches warning line, at the end of flow control, sets up PAUSE wake-up association, and will
The PAUSE wake-up association or PAUSE stop the output processing module that frame is sent at corresponding ports and are forwarded；And it parses and is identified from frame
The PAUSE frame that module 31 is sent extracts flow-control information, and flow-control information is sent to output processing module 34.
The output processing module 14, the data frame and protocol frame sent for receiving other two ports, and delay respectively
There are in two data frame queues and PAUSE frame queue, successively two data frame queues of poll and PAUSE frame queue are sent out
It send；And current data has then been sent if it is flow control Stop message for receiving the flow-control information that flow-control module 13 is sent
After frame, stop polling data frame queue, at the end of receiving flow control and waking up information or flow control, restarts polling data frame team
Column.
Retransmission method of the invention includes data receiver process and data transmission flow.
Referring to Fig. 6, the data receiver process of the method for the present invention is as follows:
Step 1, network link situation is judged according to the content in PHY chip register.
The content of its register is read by the MDio interface of PHY chip, one of them specific register indicates PHY chip
Connection status, if connection status is ON, network link is normal, executes step 2, if connection status is OFF, network link event
Barrier executes step 4.
Step 2, cross clock domain processing is carried out to the data frame of input, obtains synchrodata frame.
(2a) receives the asynchronous data frame of input using asynchronous FIFO, solves the problems, such as cross clock domain and obtains synchrodata
Frame；
(2b) cache synchronization data frame to ethernet type domain field, i.e., buffer structure depth herein only has 16 bytes,
Step 3 is executed later.
Step 3, the characteristic information of synchrodata frame is extracted.
(3a) extracts the wherein target MAC (Media Access Control) address of data frame, source due to having cached part synchrodata frame in step (2b)
The frame format of MAC Address and type field, Ethernet is as shown in table 1；
1 Ethernet data frame format of table (B:byte, byte)
| Lead code | Frame start delimiter | Destination address | Source address | Type field | Data load | Frame check code | Frame period |
| 7B | 1B | 6B | 6B | 2B | 46B-1500B | 4B | 12B |
(3b) judges the type of the data frame according to type field: when type field is 0x8808, which is PAUSE
Frame executes step 5；When type field is customized particular value, which is specialized protocol frame, executes step 6；Work as type
When for other values, which is normal data frame, executes step 7.
Step 4, link is rebuild.
(4a) can not correctly realize address search, therefore empty once visited place due to there is the port broken down in old address table
Location table establishes new address table by address learning；
(4b) fault message needs to be reported to other transponders and server, therefore building network link failure information alerts
Frame, and the frame is sent into non-faulting port, execute sending step.
Step 5, judge the type of PAUSE frame.
Judge PAUSE frame type: if it is PAUSE wake-up association, then the output flow at unlatching port, and abandoning should
PAUSE wake-up association stops frame if it is PAUSE, then stops output module and send data frame and abandon PAUSE stopping frame, until
When receiving PAUSE wake-up association or flow control time-out, stops flow control and abandon PAUSE wake-up association.
Wherein, the destination address of PAUSE is special multicast address: 01-80-C2-00-00-01, and type thresholding is
0x8808, MAC control code are 0x0001, and it is not that 0, PAUSE wake-up association MAC control parameter is that PAUSE, which stops frame MAC control parameter,
0, Ethernet PAUSE frame format is as shown in table 2.
2 Ethernet PAUSE frame format (B:byte, byte) of table
Step 6, transponder is configured.
Corresponding configuration and management are carried out to transponder according to the content of specialized protocol frame, and judge that the specialized protocol frame is
No to need to forward, if the specialized protocol frame needs that multiple transponders are managed for configuration, which just needs
Forwarding, into data sending step；If the specialized protocol frame only abandons after the completion of configuration management current transponder, configuration
The frame.
Step 7, address learning and lookup.
(7a) carries out address learning according to the source MAC and source port of data frame, with learning the source MAC of normal data frame
The mapping relations of location and source port number establish address table by the mapping relations；
(7b) searches destination port according to the target MAC (Media Access Control) address of data frame, sends into data.
Referring to Fig. 7, data transmission flow of the invention is as follows:
Step 8, output queue is established.
When (8a) is consistent due to the output port two ports, it is understood that there may be output obstruction, therefore built at destination port
Three queues are stood, store other two ports data frame to be sent and PAUSE frame to be sent respectively；
In (8b) judgement (8a) the storage state of data frame queue represents if data frame queue storage reaches warning line
It needs to carry out flow control at this time, executes step 9, it is no to then follow the steps 10.
Step 9, PAUSE frame is set up.
Set up PAUSE stop frame, and by the PAUSE stopping frame passing to reach port corresponding to the queue of warning line into
Row is sent, and pause data in request opposite end are sent, and realizes flow control with this.
Step 10, it exports to port.
(10a) when destination port is clog-free, data frame, which reaches, may be output to port, as straight-through operating mode；
(10b) when destination port has obstruction, three queues in poll (8a), and exporting to port, if having to be sent
Specialized protocol frame, it is preferential that specialized protocol frame is selected to be exported after the data frame that is exporting completes output.
The above is only preferred embodiments of the invention, do not constitute any limitation of the invention, it is clear that structure according to the present invention
Think, those skilled in the art can make different modification and displacement, but these are in the column of protection of the invention.
Claims (9)
1. a kind of low time delay ethernet repeater based on T-type structure, including port and processing unit, it is characterised in that:
The port, using T-type distributed architecture, i.e., respectively left port, right output port and user port, left port and right output port are
The network port, for connecting the network equipment, user port is accessed for user terminal；
The processing unit, comprising: left port frame processing module (1), right output port frame processing module (2), the processing of user port frame
Module (3), address learning and searching module (4), specialized protocol processing module (5) and user port adaptation module (6), in which:
Left port frame processing module (1), for receiving the data frame inputted at left port, right output port frame processing module (2) and using
The data frame of family port frame processing module (3) output, and extract the source port and source MAC address information of left port input data frame
Address learning and searching module (4) are sent into, which includes: input processing submodule (11), frame identification
Submodule (12), flow control submodule (13) and output processing submodule (14), in which:
Input processing submodule (11) caches frame originating point information, while detecting network link for receiving and synchronizing input data frame
Network link failure information is simultaneously sent to specialized protocol processing module (5) by failure；
Frame identifies submodule (12), and the frame originating point information for being cached according to input processing submodule (11) extracts the purpose of data frame
MAC Address, source MAC and frame type, and judge extracted frame type:
If data frame is normal frames, request of tabling look-up is sent to address learning and searching module (4), obtains the purpose of normal frames
Port, then destination port is judged: if destination port is right output port, the output that normal frames are sent to right output port is handled
Normal frames are sent to output processing submodule (34) of user port if destination port is user port by submodule (24)；
If data frame is PAUSE frame, PAUSE frame is sent to flow control submodule (13)；
If data frame is specialized protocol frame, specialized protocol frame is sent to specialized protocol processing module (5)；
Flow control submodule (13) is flowed for being realized according to the storage state of the data frame queue at right output port or user port
Amount control, and the PAUSE frame received is parsed, flow-control information is extracted to output processing submodule (14)；
Output processing submodule (14), for receive right output port and normal frames and PAUSE frame that user port is sent and store to
Respective queue, successively poll is exported to left port, and judges flow-control information according to the flow-control information of flow control submodule (13)
Type:
If it is flow control Stop message, then after having sent current data frame, stop poll output；
Information is waken up if it is flow control, then restarts poll output；
Right output port frame processing module (2), for receiving the data frame inputted at right output port, left port frame processing module (1) and using
The data frame of family port frame processing module (3) output, and extract the source port and source MAC address information of right output port input data frame
It is sent into address learning and searching module (4)；
User port frame processing module (3), for receiving the data frame inputted at user port adaptation module (6), left port frame
The data frame of processing module (1) and right output port frame processing module (2) output, and extract user port adaptation module (6) input number
Address learning and searching module (4) are sent into according to the source port and source MAC address information of frame；
Address learning and searching module (4), for according to left port frame processing module (1), right output port frame processing module (2) and use
Family port frame processing module (3) is sent into the source port of data frame and source MAC address information establishes address table, and passes through address search
Obtain the destination port of data frame；
Specialized protocol processing module (5), for receiving at left port frame processing module (1) and right output port frame processing module (2)
Specialized protocol frame, and the configuration and management to transponder are realized according to specialized protocol frame；
User port adaptation module (6), for the user input data at user port to be converted to data frame used in transponder
It is sent into user port frame processing module (3), and realizes Ethernet 10/100/1000M adaptation function.
2. the low time delay ethernet repeater according to claim 1 based on T-type structure, which is characterized in that address learning
With searching module (4) when network link breaks down, address learning is re-started after address table obtain new address by emptying
Table realizes that network link is rebuild.
3. the low time delay ethernet repeater according to claim 2 based on T-type structure, which is characterized in that specialized protocol
Processing module (5) received specialized protocol frame be self defined class offset ethernet frame.
4. the low time delay ethernet repeater according to claim 3 based on T-type structure, which is characterized in that right output port frame
Processing module (2) includes:
Input processing submodule (21) caches frame originating point information, while detecting network link for receiving and synchronizing input data frame
Network link failure information is simultaneously sent to specialized protocol processing module (5) by failure；
Frame identifies submodule (22), and the frame originating point information for being cached according to input processing submodule (21) extracts the purpose of data frame
MAC Address, source MAC and frame type, and judge extracted frame type:
If data frame is normal frames, request of tabling look-up is sent to address learning and searching module (4), obtains the purpose of normal frames
Port, then destination port is judged: if destination port is left port, the output that normal frames are sent to left port is handled
Normal frames are sent to output processing submodule (34) of user port if destination port is user port by submodule (14)；
If data frame is PAUSE frame, PAUSE frame is sent to flow control submodule (23)；
If data frame is specialized protocol frame, specialized protocol frame is sent to specialized protocol processing module (5)；
Flow control submodule (23) is flowed for being realized according to the storage state of the data frame queue at left port or user port
Amount control, and the PAUSE frame received is parsed, flow-control information is extracted to output processing submodule (24)；
Output processing submodule (24), for receive left port and normal frames and PAUSE frame that user port is sent and store to
Respective queue, successively poll is exported to right output port, and judges flow-control information according to the flow-control information of flow control submodule (23)
Type:
If it is flow control Stop message, then after having sent current data frame, stop poll output；
Information is waken up if it is flow control, then restarts poll output.
5. the low time delay ethernet repeater according to claim 4 based on T-type structure, which is characterized in that user port
Frame processing module (3) includes:
Input processing submodule (31) caches frame originating point information for receiving and synchronizing input data frame；
Frame identifies submodule (32), the frame originating point information rapidly extracting data frame for being cached according to input processing submodule (31)
Target MAC (Media Access Control) address, source MAC and frame type feature information, and judge extracted frame type:
If data frame is normal frames, request of tabling look-up is sent to address learning and searching module (4), obtains the purpose of normal frames
Port, then destination port is judged: if destination port is left port, the output processing that normal frames are sent to left port is sub
Normal frames are sent to output processing submodule (24) of right output port if destination port is right output port by module (14)；
If data frame is PAUSE frame, PAUSE frame is sent to flow control submodule (33)；
Flow control submodule (33), for realizing flow according to the storage state of the data frame queue at left port or right output port
Control, and for parsing the PAUSE frame received, flow-control information is extracted, and flow-control information is sent to output processing submodule
(34)；
Output processing submodule (34), for receiving data frame and PAUSE frame that left port and right output port are sent and storing to phase
Queue is answered, successively poll is exported to user port adaptation module (6), and is sentenced according to the flow-control information of flow control submodule (33)
Cutout control information type:
If it is flow control Stop message, then after having sent current data frame, stop poll output；
Information is waken up if it is flow control, then restarts poll output.
6. the low time delay ethernet repeater according to claim 5 based on T-type structure, which is characterized in that left port frame
Input processing submodule (21) in input processing submodule (11), right output port frame processing module (2) in processing module (1) and
Input processing submodule (31) in user port frame processing module (3) includes an asynchronous FIFO, to input data frame into
The processing of row cross clock domain, obtains synchrodata frame.
7. the low time delay ethernet repeater according to claim 6 based on T-type structure, which is characterized in that the left end
The input processing submodule in input processing submodule (11) and right output port frame processing module (2) in mouth frame processing module (1)
(21) network link failure is detected by way of reading PHY chip register.
8. the low time delay ethernet repeater according to claim 7 based on T-type structure, which is characterized in that the left end
The output in output processing submodule (14), right output port frame processing module (2) in mouth frame processing module (1) handles submodule
(24) and in user port frame processing module (3) output processing submodule (34) include three queues, when output port without
When obstruction, data frame is sent according to straight-through pass-through mode and passes through fair poll three queue realities when output port has obstruction
The forwarding of existing data frame.
9. a kind of low time delay Ethernet retransmission method based on T-type structure, including；
1) data reception step:
1.1) network link situation is judged according to the connection status in PHY chip register: if PHY chip connection status for ON,
Then link is normal, executes step 1.2), if PHY chip connection status is OFF, link failure executes step 1.4)；
1.2) cross clock domain processing is carried out to the asynchronous data frame of input, obtains synchrodata frame, cache synchronization data frame to
Too after net type field field, step 1.3) is executed；
1.3) its target MAC (Media Access Control) address, source MAC and type domain information are extracted from the cache contents of synchrodata frame, are judged
The type of the synchrodata frame: if synchrodata frame is PAUSE frame, executing step 1.5), if synchrodata frame is specialized protocol
Frame, the i.e. ethernet frame of self defined class offset execute step 1.6), if synchrodata frame is normal data frame, execute step
1.7)；
1.4) it rebuilds link and generates network link failure information alert frame:
Address table 1.4a) is emptied, and address table is re-established by address learning, realizes that network link is rebuild；
1.4b) building network link failure information alerts frame, and the frame is sent into non-faulting port, executes sending step 2)；
1.5) judge the type of PAUSE frame: if PAUSE frame is off frame, after the output flow for stopping port, abandoning should
PAUSE frame after the output flow at unlatching port, abandons the PAUSE frame if PAUSE frame is wake-up association；
1.6) corresponding configuration and management are carried out to transponder according to the content of specialized protocol frame, and judges that the specialized protocol frame is
It is no to need to forward, if necessary to forward, then enter data sending step 2), otherwise abandon；
1.7) address learning is carried out according to the source MAC of normal data frame and source port number, and according to the mesh of normal data frame
MAC Address search destination port, into data sending step 2)；
2) data sending step:
2.1) three queues are established at destination port, store other two ports data frame to be sent and to be sent respectively
PAUSE frame, and judge the storage state of data frame queue: if data frame queue storage reaches warning line, then follow the steps 2.2),
It is no to then follow the steps 2.3)；
2.2) set up PAUSE stop frame, and by the PAUSE stopping frame passing to reach port corresponding to the queue of warning line into
Row is sent；
2.3) three queues in poll output 2.1), it is preferential to export specialized protocol frame if there is specialized protocol frame to be sent.
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| CN108540337B (en) * | 2018-03-07 | 2020-12-22 | 百富计算机技术（深圳）有限公司 | Dual-network-port POS machine and network state monitoring system and method thereof |
| CN108551427B (en) * | 2018-03-20 | 2020-08-04 | 西安电子科技大学 | Fast convergence method of Ethernet based on T-type transponder |
| CN110401558B (en) * | 2019-04-28 | 2023-07-25 | 北京广利核系统工程有限公司 | Security level multi-point communication network equipment, system and security level network communication method |
| CN111431812B (en) * | 2020-03-25 | 2022-04-01 | 新华三信息安全技术有限公司 | Message forwarding control method and device |
| KR102549279B1 (en) * | 2020-08-19 | 2023-06-28 | 아즈빌주식회사 | Network device and network configuration determining method |
| CN112887059B (en) * | 2021-01-26 | 2023-04-07 | 芯河半导体科技(无锡)有限公司 | Method for expanding MAC frame format in-band transmission flow control data |
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