CN105933162A - Low latency Ethernet repeater and low latency Ethernet forwarding method based on T structure - Google Patents
Low latency Ethernet repeater and low latency Ethernet forwarding method based on T 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
Abstract
The invention provides a low latency Ethernet repeater and a low latency Ethernet forwarding method based on a T structure, which are used for solving the wiring redundancy problem in the existing switch and the problems that the time delay is larger and the time delay is uncertain in the existing forwarding method. The repeater comprises a port in T-type distribution and a processing unit; the processing unit comprises a left port frame processing module, a right port frame processing module, a user port frame processing module, an address learning and search module, a special protocol processing module and a user port adapter module. A forwarding method comprises the following steps: judging a link state; caching a data frame; identifying and classifying frames; reconstructing a link; classifying PAUSE frames; configuring the repeater; learning and searching an address; building an output queue; building the PAUSE frames; and outputting the PAUSE frames to the port. The low latency Ethernet repeater and the low latency Ethernet forwarding method based on the T structure provided by the invention can fully reduce the user access wiring redundancy, reduce the forwarding delay and guarantee the forwarding delay certainty, and can detect and reconstruct a network link timely during a network link failure, so that the low latency Ethernet repeater and the low latency Ethernet forwarding method can be used for building a high speed real-time access network.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of forwarded device and retransmission method, be specifically related to a kind of base
In low time delay Ethernet retransmission unit and the method for T-type structure, can be used for setting up access network the most in real time.
Background technology
Ethernet is internetwork connection mode common in LAN, and user typically first accesses switching equipment in a network, as
Switch or router, then it is connected to other network by switching equipment.Ethernet switch seeks to fill that multi-user is simultaneously
The demand of data exchange during access network, traditional ethernet switch is usually multi port switch, and multiple access is handed over
When changing planes, using the star net forming mode centered by switch, each user is required for by an independent cable even
Receive the user interface of switch, require to connect up succinct occasion, in the environment such as aircraft, high ferro, star at some
The wiring redundancy issue that networking is brought accepts being difficult to.
Traditional ethernet switch generally uses store and forward message mode, and forwarding process is as follows:
(1) input processing, mainly completes the function of the coupling of the reception of Frame, verification, data form；
(2) flow point class and packet transaction, is mainly used in extracting frame critical field information, and according to this information to ether netting index
Classify according to frame, perform corresponding process according to classification results；
(3) address learning and address search, learns according to source MAC and source port number, then according to purpose
MAC Address carries out address search, draws destination interface；
(4) join the team, according to information such as destination slogan and priority, distribute buffer address for Frame, and be deposited into
Corresponding output queue；
(5) go out team, according to schedule information, inquire group buffer address at frame place, and remove it output queue；
(6) output processes, and mainly completes the data frame buffer memory at output port and the function of data frame format coupling；
Wherein input-buffer, joining the team and exporting in the steps such as caching all completely can cache Frame, causes data
The Forwarding Delay of frame is relatively big, and owing to the length of Frame is not fixed, the Forwarding Delay that therefore switch introduces has
Uncertain.
Summary of the invention
It is an object of the invention to the defect overcoming traditional ethernet switching technology to exist, it is proposed that a kind of based on T junction
The low time delay Ethernet retransmission unit of structure and method, for solve existing switch exist wiring redundancy, time delay bigger
With time delay uncertain problem.
To achieve these goals, the technical thought of the present invention is: forward only with storage with traditional ethernet switch
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 without
During obstruction, switch uses straight-through forward mode, and switch is opened after receiving the ethernet type field of Frame at once
The lookup of beginning Frame forwards, and complete Frame is cached owing to need not by whole repeating process, it is ensured that turn
The low time delay of the process of sending out, and owing to the length of the part Frame of caching is fixed, it is ensured that the definitiveness of Forwarding Delay；
When output port occur block time, switch use store and forward message mode, switch by data frame buffer memory to output port
Rear poll exports.
For achieving the above object, present invention low time delay based on T-type structure ethernet repeater, including port and process
Unit, it is characterised in that:
Described port, uses T-shaped distributed architecture, the most respectively left port, right output port and user port, left port and
Right output port is the network port, is used for connecting the network equipment, and user port accesses for user terminal；
Described processing unit, including:
Left port frame processing module, for receiving Frame, right output port frame processing module and the user of input at left port
The Frame of port frame processing module output, and extract source port and the source MAC letter of left port input data frame
Breath is sent into address learning and searches module；
Right output port frame processing module, for receiving Frame, left port frame processing module and the user of input at right output port
The Frame of port frame processing module output, and extract source port and the source MAC letter of right output port input data frame
Breath is sent into address learning and searches module；
User port frame processing module, for receiving at user port adaptation module at the Frame of input, left port frame
Reason module and the Frame of right output port frame processing module output, and extract the source of user port adaptation module input data frame
Port and source MAC address information are sent into address learning and search module；
Address learning and lookup module, for according to left port frame processing module, right output port frame processing module and user side
Source port and the source MAC address information of mouth frame processing module feeding Frame set up address table, and pass through address search
Obtain the destination interface of Frame；
Specialized protocol processing module, for receiving the special association at left port frame processing module and right output port frame processing module
View frame, and realize the configuration to transponder and management according to specialized protocol frame；
User port adaptation module, for being converted to Frame used by transponder by the user input data at user port
Send into user port frame processing module, and realize Ethernet 10/100/1000M adaptation function.
For achieving the above object, present invention low time delay based on T-type structure Ethernet retransmission method, including；
1) data reception step:
1.1) network link situation is judged according to the connection status in PHY chip depositor: if PHY chip connects shape
State is ON, then link is normal, performs step 1.2), if PHY chip connection status is OFF, then link failure,
Perform step 1.4)；
1.2) asynchronous data frame of input is carried out cross clock domain process, obtain synchrodata frame, cache synchronization Frame
To the field of ethernet type territory, perform step 1.3)；
1.3) from the cache contents of synchrodata frame, its target MAC (Media Access Control) address, source MAC and type field are extracted
Information, it is judged that the type of this synchrodata frame: if synchrodata frame is PAUSE frame, performs step 1.5), if with
Step data frame is specialized protocol frame, i.e. the ethernet frame of self defined class offset, performs step 1.6), if synchrodata frame
For normal data frame, perform step 1.7)；
1.4) rebuild link and produce network link failure information alert frame:
1.4a) empty address table, and re-establish address table by address learning, it is achieved network link is rebuild；
1.4b) building network link failure information alarm frame, and this frame is sent into non-faulting port, perform forwarding step
2)；
1.5) type of PAUSE frame is judged: if PAUSE frame is off frame, then after stopping the output flow of port,
Abandon this PAUSE frame, if PAUSE frame is to wake up frame up, then, after opening the output flow of port, abandon this
PAUSE frame；
1.6) according to the content of specialized protocol frame transponder configured accordingly and manage, and judging this specialized protocol
Frame, the need of forwarding, if needing to forward, then enters data sending step 2), otherwise abandon；
1.7) source MAC and source port number according to normal data frame carry out address learning, and according to general data
The target MAC (Media Access Control) address of frame searches destination interface, enters data sending step 2)；
2) data sending step:
2.1) at destination interface, set up three queues, deposit other two ports 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
Perform step 2.2), otherwise perform step 2.3)；
2.2) set up PAUSE and stop frame, and this PAUSE stopping frame being passed to reach corresponding to the queue of warning line
Port be transmitted；
2.3) poll output 2.1) in three queues, if there being specialized protocol frame to be sent, preferential export special association
View frame.
The present invention compared with prior art, has the advantage that
First, due to the fact that employing T-type structure, first user is accessed user port and is realized by transponder cascade
The network insertion of multi-user, and conventional switch uses stelliform connection topology configuration to realize the network insertion of multi-user, therefore originally
Invention greatly reduces the wiring redundancy issue that user accesses.
Second, due to the fact that not complete to the Frame caching of input processing, as long as extracting number during receiving data frames
Can be carried out searching according to the type field of frame and forward, and without joining the team, going out the steps such as team, when exporting clog-free, just
Can be operated under direct mode operation, greatly reduce Forwarding Delay, and owing to the length of the part Frame of caching is solid
Fixed, it is ensured that the definitiveness of Forwarding Delay.
3rd, due to the fact that when network link breaks down, address search and study module can be by emptying address
Table, and retrieve address table by address learning, it is achieved network link is rebuild, and enhances the reliability of network.
Accompanying drawing explanation
Fig. 1 is the overall structure block diagram of apparatus of the present invention；
Fig. 2 is the structured flowchart of apparatus of the present invention processing unit；
Fig. 3 is the structured flowchart of apparatus of the present invention left port frame processing module；
Fig. 4 is the structured flowchart of apparatus of the present invention right output port frame processing module；
Fig. 5 is the structured flowchart of apparatus of the present invention user port frame processing module；
Fig. 6 is the data receiver FB(flow block) of retransmission method of the present invention；
Fig. 7 is the data transmission flow block diagram of retransmission method of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
With reference to Fig. 1, apparatus of the present invention include three ports and a processing unit, three ports be respectively left port,
Right output port and user port, these three T-shaped distributions of port, wherein left port and right output port are the network port, network
Port uses gigabit ethernet interface, and user port can be the port of multiple interfaces agreement, and two network ports are used for
The interconnection of apparatus of the present invention or be connected with external network, user port is used for connecting user.
With reference to Fig. 2, the processing unit of apparatus of the present invention includes: left port frame processing module 1, and right output port frame processes mould
Block 2, user port frame processing module 3, address learning and lookup module 4, specialized protocol processing module 5, user side
Mouth adaptation module 6.
Described left port frame processing module 1, for receiving left port Frame and extracting the purpose MAC ground of Frame
Location, source MAC and type, target MAC (Media Access Control) address therein and source MAC are mail to address learning with
Search module 4, specialized protocol frame is mail to specialized protocol processing module 5；Receive right output port frame processing module 2 and use
The output data frame of family port frame processing module 3 also exports to left port.
Described right output port frame processing module 2, for receiving right output port Frame and extracting the purpose MAC ground of Frame
Location, source MAC and type, target MAC (Media Access Control) address therein and source MAC are mail to address learning with
Search module 4, specialized protocol frame is mail to specialized protocol processing module 5；Receive left port frame processing module 2 and use
The output data frame of family port frame processing module 3 also exports to left port.
Described user port frame processing module 3, for receiving user port Frame and extracting purpose MAC of Frame
Address, source MAC and type, mail to address learning by target MAC (Media Access Control) address therein and source MAC
With lookup module 4, receive left port frame processing module 2 and the output data frame of right output port frame processing module 3 also exports
To left port.
Described address learning and lookup module 4, utilize the source port of Frame and source MAC address information to set up address table,
The target MAC (Media Access Control) address utilizing Frame carries out address search and obtains the destination interface of Frame, according to network link event
Network link after barrier is rebuild instruction and is emptied the address table of transponder, and re-establishes address table by address learning, real
Existing network network link re-establishment.
Described specialized protocol processing module 5, is used for according to specialized protocol frame, the i.e. ethernet frame of self defined class offset,
Realize the configuration of transponder and management, and for receive and resolve the network link failure information of the port and other
Port forwards the network link failure information alert frame of coming, and produces network link and rebuilds instruction, and by this network link weight
Build instruction be sent to address learning and search module 4, and building network link failure information alarm frame, wait non-faulting
The frame processing module poll of the network port forwards.
Described user port adaptation module 6, owing to the user data at user port may be with Frame used by transponder
Difference, needs the user input data at by user port to be converted to Frame used by transponder and sends at user port frame
Reason module 3, and realize Ethernet 10/100/1000M adaptation function.
Above-mentioned left port frame processing module 1, right output port frame processing module 2 interconnect mutually with user port frame processing module 3
Connect, address learning with search module 4 respectively with left port frame processing module 1, right output port frame processing module 2 and user
Port frame processing module 3 is connected, specialized protocol processing module 5 respectively with left port frame processing module 1 and right output port frame
Processing module is connected, and user port adaptation module 6 is connected with user port frame processing module 3.
With reference to Fig. 3, the left port frame processing module 1 of the present invention includes: input processing submodule 11, frame identification submodule
Block 12, flow-control submodule 13 and output process submodule 14.
Described input processing module 11, for detecting possible network link failure, is sent to special association by fault message
View processing module 5；By using asynchronous FIFO to eliminate the metastable issues of Frame cross clock domain, receive and cache
Frame is to ethernet type territory field, and the Frame partial bytes of caching is mail to frame identification module 12.
Described frame identification module 12, for extracting Frame according to the part Frame of input processing module 11 caching
Target MAC (Media Access Control) address, source MAC and frame type, and judge extracted frame type:
If Frame is normal frames, then send, with searching module 4, the request of tabling look-up to address learning, obtain destination
Mouthful, then destination interface is judged: if destination interface is right output port, then normal frames is sent to the output of right output port
Processing submodule 24, if destination interface is user port, the output that normal frames is sent to user port processes submodule
34；
If Frame is PAUSE frame, then PAUSE frame is sent to flow-control submodule 13；
If specialized protocol frame, then this frame is sent to specialized protocol processing module 5.
Described flow-control module 13, for realizing flow control according to the storage state of the data frame queue at destination interface
System, when data frame queue arrives warning line, sets up PAUSE and stops frame, at the end of stream control, set up PAUSE
Wake up frame up, and this PAUSE is waken up frame up or PAUSE stops the output processing module that frame sends at corresponding ports and carries out
Forward；And resolve the PAUSE frame sent here from frame identification module 11, extract flow-control information, and flow-control information is sent
To output processing module 14.
Described output processing module 14, for receiving Frame and the protocol frame that other two ports are sent, and delays respectively
Exist in two data frame queue and PAUSE frame queue, successively two data frame queue of poll and PAUSE frame queue
It is transmitted, if specialized protocol processing module 3 has network link failure information alert frame, the most preferentially sends this network
Link failure information alarm frame；And for receiving the flow-control information that flow-control module 13 is sent, if stream control stops
Only information, then, after having sent current data frame, stop polling data frame queue, until receiving stream control to wake up information or stream up
At the end of control, restart polling data frame queue.
With reference to Fig. 4, the right output port frame processing module 2 of the present invention includes: input processing submodule 21, frame identification submodule
Block 22, flow-control submodule 23 and output process submodule 24.
Described input processing module 21, for detecting possible network link failure, is sent to special association by fault message
View processing module 5；By using asynchronous FIFO to eliminate the metastable issues of Frame cross clock domain, receive and cache
Frame is to ethernet type territory field, and the Frame partial bytes of caching is mail to frame identification module 22.
Described frame identification module 22, for extracting Frame according to the part Frame of input processing module 21 caching
Target MAC (Media Access Control) address, source MAC and frame type, and judge extracted frame type:
If Frame is normal frames, then send, with searching module 4, the request of tabling look-up to address learning, obtain destination
Mouthful, then destination interface is judged: if destination interface is left port, then normal frames is sent to the output of right output port
Processing submodule 14, if destination interface is user port, the output that normal frames is sent to user port processes submodule
34；
If Frame is PAUSE frame, then PAUSE frame is sent to flow-control submodule 23；
If specialized protocol frame, then this frame is sent to specialized protocol processing module 5.
Described flow-control module 23, for realizing flow control according to the storage state of the data frame queue at destination interface
System, when data frame queue arrives warning line, sets up PAUSE and stops frame, at the end of stream control, set up PAUSE
Wake up frame up, and this PAUSE is waken up frame up or PAUSE stops the output processing module that frame sends at corresponding ports and carries out
Forward；And resolve the PAUSE frame sent here from frame identification module 21, extract flow-control information, and flow-control information is sent
To output processing module 24.
Described output processing module 14, for receiving Frame and the protocol frame that other two ports are sent, and delays respectively
Exist in two data frame queue and PAUSE frame queue, successively two data frame queue of poll and PAUSE frame queue
It is transmitted, if specialized protocol processing module 3 has network link failure information alert frame, the most preferentially sends this network
Link failure information alarm frame；And for receiving the flow-control information that flow-control module 23 is sent, if stream control stops
Only information, then, after having sent current data frame, stop polling data frame queue, until receiving stream control to wake up information or stream up
At the end of control, restart polling data frame queue.
With reference to Fig. 5, the user port frame processing module 3 of the present invention includes: input processing submodule 31, frame identification
Module 32, flow-control submodule 33 and output process submodule 34.
Described input processing module 31, by using asynchronous FIFO to eliminate the metastable issues of Frame cross clock domain,
Receive and data cached frame is to ethernet type territory field, and the Frame partial bytes of caching is mail to frame identification module
32。
Described frame identification module 32, for extracting Frame according to the part Frame of input processing module 31 caching
Target MAC (Media Access Control) address, source MAC and frame type, and judge extracted frame type:
If Frame is normal frames, then send, with searching module 4, the request of tabling look-up to address learning, obtain destination
Mouthful, then destination interface is judged: if destination interface is left port, then normal frames is sent to the output of right output port
Processing submodule 14, if destination interface is right output port, the output that normal frames is sent to user port processes submodule
24；
If Frame is PAUSE frame, then PAUSE frame is sent to flow-control submodule 33；
Described flow-control module 33, for realizing flow control according to the storage state of the data frame queue at destination interface
System, when data frame queue arrives warning line, sets up PAUSE and stops frame, at the end of stream control, set up PAUSE
Wake up frame up, and this PAUSE is waken up frame up or PAUSE stops the output processing module that frame sends at corresponding ports and carries out
Forward；And resolve the PAUSE frame sent here from frame identification module 31, extract flow-control information, and flow-control information is sent
To output processing module 34.
Described output processing module 14, for receiving Frame and the protocol frame that other two ports are sent, and delays respectively
Exist in two data frame queue and PAUSE frame queue, successively two data frame queue of poll and PAUSE frame queue
It is transmitted；And for receiving the flow-control information that flow-control module 13 is sent, if stream control Stop message, then
After having sent current data frame, stop polling data frame queue, until receive stream control wake up up information or stream control at the end of,
Restart polling data frame queue.
The retransmission method of the present invention includes data receiver flow process and data transmission flow.
With reference to Fig. 6, the data receiver flow process of the inventive method is as follows:
Step 1, judges network link situation according to the content in PHY chip depositor.
MDio interface by PHY chip reads the content of its depositor, and one of them specific depositor represents PHY
Chip connection status, if connection status is ON, then network link is normal, performs step 2, if connection status is OFF,
Then network link failure, performs step 4.
Step 2, carries out cross clock domain process to the Frame of input, obtains synchrodata frame.
(2a) utilize asynchronous FIFO to receive the asynchronous data frame of input, solve cross clock domain problem and obtain same step number
According to frame；
(2b) cache synchronization Frame only has 16 words to ethernet type territory field, the buffer structure degree of depth the most herein
Joint, performs step 3 afterwards.
Step 3, extracts the characteristic information of synchrodata frame.
(3a) owing to step (2b) having cached Partial synchronization Frame, purpose MAC of wherein Frame is extracted
Address, source MAC and type field, the frame format of Ethernet is as shown in table 1；
Table 1 Ethernet data frame format (B:byte, byte)
| Lead code | SFD | Destination address | Source address | Type field | Data load | Frame check code | Frame period |
| 7B | 1B | 6B | 6B | 2B | 46B-1500B | 4B | 12B |
(3b) judging the type of this Frame according to type field: when type field is 0x8808, this Frame is PAUSE
Frame, performs step 5；When type field is self-defining particular value, this Frame is specialized protocol frame, performs step
6；When type is other values, this Frame is normal data frame, performs step 7.
Step 4, rebuilds link.
(4a) owing to old address table existing the port broken down, it is impossible to correctly realize address search, therefore empty old
Address table, sets up new address table by address learning；
(4b) fault message needs to report other transponders and server, therefore building network link failure information alerts
Frame, and this frame is sent into non-faulting port, perform forwarding step.
Step 5, it is judged that the type of PAUSE frame.
Judge PAUSE frame type: if PAUSE wakes up frame up, then open the output flow of port, and abandon
This PAUSE wakes up frame up, if PAUSE stops frame, then stops output module and sends Frame and abandon PAUSE
Stop frame, until receiving PAUSE when waking up frame or stream control time-out up, stopping stream control and abandoning PAUSE and waking up frame up.
Wherein, the destination address of PAUSE is special multicast address: 01-80-C2-00-00-01, and type thresholding is
0x8808, MAC control code is that 0x0001, PAUSE stop frame MAC to control parameter to be not 0, and PAUSE wakes up up
It is 0 that frame MAC controls parameter, and Ethernet PAUSE frame format is as shown in table 2.
Table 2 Ethernet PAUSE frame format (B:byte, byte)
Step 6, configures transponder.
Transponder is configured and manages by content according to specialized protocol frame accordingly, and judges that this specialized protocol frame is
No needs forwards, if this specialized protocol frame needs to be managed for configuration multiple transponders, then this specialized protocol frame is just
Need to forward, enter data sending step；If this specialized protocol frame is simply in configuration management current transponder, configuration
This frame is abandoned after completing.
Step 7, address learning and lookup.
(7a) address learning, the source of study normal data frame are carried out according to the source MAC of Frame with source port
MAC Address and the mapping relations of source port number, set up address table by these mapping relations；
(7b) search destination interface according to the target MAC (Media Access Control) address of Frame, enter data and send.
With reference to Fig. 7, the data transmission flow of the present invention is as follows:
Step 8, sets up output queue.
(8a) due to when the output port of two ports is consistent, it is understood that there may be output is blocked, therefore at destination interface
Set up three queues, deposit other two ports Frame to be sent and PAUSE frame to be sent respectively；
(8b) the storage state of data frame queue in (8a) is judged, if data frame queue storage reaches warning line, i.e.
Represent and now need to carry out flow-control, perform step 9, otherwise perform step 10.
Step 9, sets up PAUSE frame.
Set up PAUSE and stop frame, and this PAUSE stopping frame being passed to the end reached corresponding to the queue of warning line
Mouth is transmitted, and request opposite end is suspended data and sent, and realizes flow-control with this.
Step 10, output is to port.
(10a) when destination interface is clog-free, Frame arrives and i.e. may be output to port, is straight-through mode of operation；
(10b) when destination interface has obstruction, three queues in poll (8a), and export to port, if having
Specialized protocol frame to be sent, after the Frame exported completes output, prioritizing selection specialized protocol frame exports.
These are only the preferred embodiment of the present invention, do not constitute any limitation of the invention, it is clear that according to the structure of the present invention
Thinking, those skilled in the art all can make different amendments and displacement, but these are all at the row of protection of the present invention.
Claims (10)
1. a low time delay ethernet repeater based on T-type structure, including port and processing unit, it is characterised in that:
Described port, uses T-shaped distributed architecture, the most respectively left port, right output port and user port, left port and the right side
Port is the network port, is used for connecting the network equipment, and user port accesses for user terminal；
Described processing unit, including:
Left port frame processing module (1), for receiving the Frame of input, right output port frame processing module (2) at left port
The Frame exported with user port frame processing module (3), and extract source port and the source MAC of left port input data frame
Address information is sent into address learning and searches module (4)；
Right output port frame processing module (2), for receiving the Frame of input, left port frame processing module (1) at right output port
The Frame exported with user port frame processing module (3), and extract source port and the source MAC of right output port input data frame
Address information is sent into address learning and searches module (4)；
User port frame processing module (3), is used for receiving the Frame of user port adaptation module (6) place input, left end
The Frame that mouth frame processing module (1) and right output port frame processing module (2) export, and extract user port adaptation module
(6) source port and the source MAC address information of input data frame is sent into address learning and searches module (4)；
Address learning and lookup module (4), for according to left port frame processing module (1), right output port frame processing module (2)
Set up address table with source port and the source MAC address information of user port frame processing module (3) feeding Frame, and lead to
Cross address search and obtain the destination interface of Frame；
Specialized protocol processing module (5), is used for receiving left port frame processing module (1) and right output port frame processing module (2)
The specialized protocol frame at place, and realize the configuration to transponder and management according to specialized protocol frame；
User port adaptation module (6), for being converted to data used by transponder by the user input data at user port
Frame sends into user port frame processing module (3), and realizes Ethernet 10/100/1000M adaptation function.
Low time delay ethernet repeater based on T-type structure the most according to claim 1, it is characterised in that ground
Location study and lookup module (4) are when network link breaks down, by re-starting address learning after emptying address table
Obtain new address table, it is achieved network link is rebuild.
Low time delay ethernet repeater based on T-type structure the most according to claim 1, it is characterised in that special
The ethernet frame that specialized protocol frame is self defined class offset that protocol process module (5) is received.
Low time delay ethernet repeater based on T-type structure the most according to claim 1, it is characterised in that left
Port frame processing module (1) including:
Input processing submodule (11), is used for receiving and synchronizing input data frame, caching frame header, detects net simultaneously
Network link failure information is also sent to specialized protocol processing module (5) by network link failure；
Frame identification submodule (12), extracts Frame for the frame originating point information cached according to input processing submodule (11)
Target MAC (Media Access Control) address, source MAC and frame type, and judge extracted frame type:
If Frame is normal frames, then send, with searching module (4), the request of tabling look-up to address learning, obtain normal frames
Destination interface, then destination interface is judged: if destination interface is right output port, then normal frames is sent to right output port
Output process submodule (24), if destination interface is user port, normal frames is sent at the output of user port
Reason submodule (34)；
If Frame is PAUSE frame, then PAUSE frame is sent to flow-control submodule (13)；
If Frame is specialized protocol frame, then specialized protocol frame is sent to specialized protocol processing module (5)；
Flow-control submodule (13), real for the storage state according to the data frame queue at right output port or user port
Existing flow-control, and resolve the PAUSE frame received, extract flow-control information and process submodule (14) to output；
Output processes submodule (14), for receiving right output port and normal frames that user port is sent and PAUSE frame deposit
Storage is to respective queue, and poll output is to left port successively, and judges according to the flow-control information of flow-control submodule (13)
Flow-control information type:
If stream control Stop message, then, after having sent current data frame, stop poll output；
If stream control wakes up information up, then restart poll output.
Low time delay ethernet repeater based on T-type structure the most according to claim 1, it is characterised in that right
Port frame processing module (2) including:
Input processing submodule (21), is used for receiving and synchronizing input data frame, caching frame header, detects net simultaneously
Network link failure information is also sent to specialized protocol processing module (5) by network link failure；
Frame identification submodule (22), extracts Frame for the frame originating point information cached according to input processing submodule (21)
Target MAC (Media Access Control) address, source MAC and frame type, and judge extracted frame type:
If Frame is normal frames, then send, with searching module (4), the request of tabling look-up to address learning, obtain normal frames
Destination interface, then destination interface is judged: if destination interface is left port, then normal frames is sent to left port
Output process submodule (14), if destination interface is user port, normal frames is sent at the output of user port
Reason submodule (34)；
If Frame is PAUSE frame, then PAUSE frame is sent to flow-control submodule (23)；
If Frame is specialized protocol frame, then specialized protocol frame is sent to specialized protocol processing module (5)；
Flow-control submodule (23), real for the storage state according to the data frame queue at left port or user port
Existing flow-control, and resolve the PAUSE frame received, extract flow-control information and process submodule (24) to output；
Output processes submodule (24), for receiving left port and normal frames that user port is sent and PAUSE frame deposit
Storage is to respective queue, and poll output is to right output port successively, and judges according to the flow-control information of flow-control submodule (23)
Flow-control information type:
If stream control Stop message, then, after having sent current data frame, stop poll output；
If stream control wakes up information up, then restart poll output.
Low time delay ethernet repeater based on T-type structure the most according to claim 1, it is characterised in that use
Family port frame processing module (3) including:
Input processing submodule (31), is used for receiving and synchronizing input data frame, caching frame header；
Frame identification submodule (32), for the frame originating point information rapid extraction number cached according to input processing submodule (31)
The characteristic informations such as target MAC (Media Access Control) address, source MAC and the frame type according to frame, and judge extracted frame type:
If Frame is normal frames, then send, with searching module (4), the request of tabling look-up to address learning, obtain normal frames
Destination interface, then destination interface is judged: if destination interface is left port, normal frames is sent to left port
Output processes submodule (14), if destination interface is right output port, the output that normal frames is sent to right output port processes submodule
Block (24)；
If Frame is PAUSE frame, then PAUSE frame is sent to flow-control submodule (33)；
Flow-control submodule (33), realizes for the storage state according to the data frame queue at left port or right output port
Flow-control, and for resolving the PAUSE frame received, extract flow-control information, and flow-control information is sent to output
Process submodule (34)；
Output processes submodule (34), for receiving left port and Frame that right output port is sent and PAUSE frame store
To respective queue, poll exports to user port adaptation module (6) successively, and according to flow-control submodule (33)
Flow-control information judges flow-control information type:
If stream control Stop message, then, after having sent current data frame, stop poll output；
If stream control wakes up information up, then restart poll output.
7., according to the low time delay ethernet repeater based on T-type structure described in claim 4 or 5 or 6, its feature exists
In, input processing submodule (11), input processing submodule (21) and input processing submodule (31) all include one
Individual asynchronous FIFO, carries out cross clock domain process to input data frame, obtains synchrodata frame.
8. according to the low time delay ethernet repeater based on T-type structure described in claim 4 or 5, it is characterised in that
Described input processing submodule (11) and input processing submodule (21) are all by the way of reading PHY chip depositor
Detection network link failure.
9., according to the low time delay ethernet repeater based on T-type structure described in claim 4 or 5 or 6, its feature exists
In, described output processes submodule (14), output processes submodule (24) and output processes submodule (34) and all wraps
Containing three queues, when output port is clog-free, send Frame according to straight-through pass-through mode, when output port has obstruction
Time, the forwarding of Frame is realized by fair these three queues of poll.
10. a 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 depositor: if PHY chip connection status
For ON, then link is normal, performs step 1.2), if PHY chip connection status is OFF, then link failure, perform
Step 1.4)；
1.2) asynchronous data frame of input being carried out cross clock domain process, obtain synchrodata frame, cache synchronization Frame is extremely
After the field of ethernet type territory, perform step 1.3)；
1.3) from the cache contents of synchrodata frame, extract its target MAC (Media Access Control) address, source MAC and type field letter
Breath, it is judged that the type of this synchrodata frame: if synchrodata frame is PAUSE frame, performs step 1.5), if same step number
Be specialized protocol frame according to frame, i.e. the ethernet frame of self defined class offset, perform step 1.6), if synchrodata frame is common
Frame, performs step 1.7)；
1.4) rebuild link and produce network link failure information alert frame:
1.4a) empty address table, and re-establish address table by address learning, it is achieved network link is rebuild；
1.4b) building network link failure information alarm frame, and this frame is sent into non-faulting port, perform forwarding step 2)；
1.5) type of PAUSE frame is judged: if PAUSE frame is off frame, then after stopping the output flow of port,
Abandon this PAUSE frame, if PAUSE frame is to wake up frame up, then after opening the output flow of port, abandon this PAUSE
Frame；
1.6) according to the content of specialized protocol frame transponder configured accordingly and manage, and judging this specialized protocol frame
The need of forwarding, if needing to forward, then enter data sending step 2), otherwise abandon；
1.7) source MAC and source port number according to normal data frame carry out address learning, and according to normal data frame
Target MAC (Media Access Control) address search destination interface, enter data sending step 2)；
2) data sending step:
2.1) at destination interface, set up three queues, deposit other two ports 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 perform
Step 2.2), otherwise perform step 2.3)；
2.2) set up PAUSE and stop frame, and this PAUSE stopping frame being passed to reach corresponding to the queue of warning line
Port is transmitted；
2.3) poll output 2.1) in three queues, if there being specialized protocol frame to be sent, preferentially export specialized protocol
Frame.
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