CN102739430A - Method and system for realizing Ethernet protection switching - Google Patents
Method and system for realizing Ethernet protection switching Download PDFInfo
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- CN102739430A CN102739430A CN201110095468XA CN201110095468A CN102739430A CN 102739430 A CN102739430 A CN 102739430A CN 201110095468X A CN201110095468X A CN 201110095468XA CN 201110095468 A CN201110095468 A CN 201110095468A CN 102739430 A CN102739430 A CN 102739430A
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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
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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Abstract
The invention provides a method for realizing an Ethernet protection switching. The method comprises: in two data units dual-homed connected in the Ethernet, when a data unit which is transmitting a service learns local link anomalies, inserting an alarm in a time slot of a corresponding system port, and a cross board choosing the system port's time slot of the data unit without the alarm to transmit the service according to a sub-network connection protection. The invention also provides a system for realizing the Ethernet protection switching. The method and the system can effectively solve a problem that in a dual-homed connection, the service cannot be continuously transmitted as normal when a channel is broke down.
Description
Technical field
The present invention relates to network communications technology field, implementation method and system are switched in the protection that relates to a kind of Ethernet service more specifically.
Background technology
Be accompanied by Internet development, the rapid growth of data service, ethernet technology has obtained extensively and important use; And because succession and development that mechanics of communication is used, Ethernet also develops towards multiple service supporting (Multi-Service Transport Platform is called for short MSTP) direction.In the practical application of Ethernet, some business require increasingly high to reliability, the real-time of network.Therefore, need support the method that the Ethernet protection of high reliability and real-time is switched (Ethernet Protection Switching, abbreviation EPS) in the network.
As shown in Figure 1, the sketch map that the Ethernet dual homed connects has been described, explain item by item below:
Two veneer ports that are connected with client, one is work veneer port, and another is protection veneer port, and two veneer ports are active and standby each other.
Two veneers respectively have a port to be connected (according to MEF (Metro Ethernet Forum with client; Territory, territory Ethernet forum); Be UNI (User-to-Network interface, user and network interface) or user port), two veneers also have the port of equal number to link to each other (according to MEF with transmission network simultaneously; Be NNI (Network-to-Network Interface, network and network interface) or system port).The system port of two veneers has identical business configuration.Each veneer comprises one or more system ports.
One of them user port and system port assembly thereof are changed to the Working service passage of EPS protection group, and another user port and system port assembly thereof are changed to the protection service channel of EPS protection group.
Each other the Working service passage with the protection service channel every pair of all time slots that the system port group is comprised; All need be by SNCP (Sub-Network Connection Protection; Be abbreviated as SNCP) collocation method; Be fitted on the same time slot of same tabula rasa, constitute of the SNCP protection of two system port groups the part time slot of a light mouth.After cross board, link to each other with the same time slot of tabula rasa.
Cross board is selected with nowhere to turn to warning and being a side time slot passage transmitting and receiving service of the system port group of Working service passage according to the principle of concurrent excellent receipts; As the system port group of protection service channel, it can receive the business from far-end, but its business that sends to far-end can't be dealt on the tabula rasa.
In this network, Working service passage just often business can normally transmit, if the Working service passage link occurs when unusual, the business of client will normally transmit and interrupt so.
Summary of the invention
The technical problem that the present invention will solve provides a kind of Ethernet protection reverse method and system, the problem of service disconnection when solving channel failure of existing Ethernet dual homed connection.
In order to address the above problem, the invention provides a kind of Ethernet protection and switch implementation method, comprising:
In two data unit that the Ethernet dual homed connects; Carrying out the professional data cell that transmits knows when self link is unusual; In the time slot of its corresponding system port, insert alarm, cross board is selected to carry out business transmission with nowhere to turn to the time slot of the system port of alert data cell according to SNCP.
Further; Said method also can have following characteristics; Said method also comprises: currently do not carry out the professional data cell that transmits and know when the link that carries out the professional data cell that transmits is unusual, saidly currently do not carry out the professional data cell that transmits and remove the alarm in the time slot of its corresponding system port.
Further, said method also can have following characteristics, and said method also comprises, when said data cell is inserted alarm in the time slot of its corresponding system port, also blocks its corresponding system port.
Further; Said method also can have following characteristics; Current data cell of not carrying out the business transmission knows when the link that carries out the professional data cell that transmits is unusual that said current data cell of not carrying out professional transmission is also opened its corresponding system port.
Further; Said method also can have following characteristics; Said method also comprises: said two data unit judge through link detecting whether link is unusual; And link-state information sent to said cross board, said cross board sends to another data cell in said two data unit with the link-state information of each data cell.
Further; Said method also can have following characteristics; Said method also comprises: the said cross board fixed time is judged that this data cell Link State is unusual and informs another data cell when not receiving the link-state information of a data unit in said two data unit.
The present invention also provides a kind of Ethernet protection to switch the realization system, comprising: main with data cell, preliminary data unit and cross board, said master links to each other through system port with cross board with data cell; Said preliminary data unit links to each other through system port with cross board, wherein:
Said master is used for data cell or preliminary data unit: when this data cell is being carried out business when transmitting, if know that self link is unusual, in the time slot of its corresponding system port, insert alarm;
Said cross board is used for: select to carry out business transmission with nowhere to turn to the time slot of the system port of alert data cell according to SNCP.
Further; Said system also can have following characteristics; Said master also is used for data cell or preliminary data unit: do not carry out the business transmission when this data cell is current; And know when another link that is carrying out the professional data cell that transmits is unusual, saidly do not carry out the professional data cell that transmits and remove the alarm in the time slot of its corresponding system port.
Further, said system also can have following characteristics, and said master also is used for data cell or preliminary data unit: when the time slot of its corresponding system port inserts alarm, also block its corresponding system port.
Further; Said system also can have following characteristics; Said master also is used for data cell or preliminary data unit: do not carry out the business transmission when this data cell is current; And know that when another link that is carrying out the professional data cell that transmits was unusual, said data cell of not carrying out professional transmission was also opened its corresponding system port.
Further, said system also can have following characteristics, and said master also is used for data cell or preliminary data unit: judge through link detecting whether link is unusual, and link-state information is sent to cross board;
Said cross board also is used for: receive main link-state information with data cell or preliminary data unit feedback; Main link-state information with data cell is sent to the preliminary data unit, the link-state information of preliminary data unit is sent to lead use data cell.
Further; Said system also can have following characteristics; Said cross board also is used for: when at the appointed time not receiving said master with the link-state information of data cell or preliminary data unit, judge that this data cell Link State is unusual and inform another data cell.
In sum, the invention provides the method for the quick protective switch that a kind of Ethernet dual homed connects, solve the dual homed problem that business can't normally continue to transmit during a channel failure in connecting effectively, the protection speed of switching reaches the demand of carrier class Ethernet; The present invention has simultaneously prevented that also the broadcast storm and the data of Ethernet connection network from transmitting problems such as upset.The present invention need not the special cooperation of client device, promptly need not to transmit between client and the website message and comes interactive information.The present invention can be applied in the multiple networking.
Description of drawings
Fig. 1 is the sketch map that an Ethernet dual homed connects;
Fig. 2 is the state transition sketch map of primary and backup veneer in the EPS group.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.Should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
The implementation method that the present invention provides a kind of Ethernet protection to switch not by means of the transmitting-receiving of protocol massages, through to the detection of main/slave link connection status and the control of transmission channel, realizes the quick protective switch of primary channel.Comprise:
1) under all normal situation of the two passes that the Ethernet dual homed connects; The protection passage inserts alarm; Force SNCP to select service aisle to carry out business and transmit, in addition, block the system port of protection passage; Make the protection passage not receive and send business, thereby avoided the professional upset that transmits of client;
2) in the two passes that the Ethernet dual homed connects one when bearing the professional passage generation link failure that transmits; Veneer perceives through the link detecting of the 802.3MAC port of user port; Bearing the professional passage that transmits and inserting alarm, forcing SNCP to select another passage to carry out business and transmit, in addition; Open the system port of the former passage that gets clogged, make it can bear professional the transmission.Service protection when so just having accomplished channel failure has been avoided professional interruption and has been lost.
The present invention provides a kind of Ethernet protection to switch implementation method, comprising:
In two data unit that the Ethernet dual homed connects; Carrying out the professional data cell that transmits knows when self link is unusual; In the time slot of its corresponding system port, insert alarm, cross board is selected to carry out business transmission with nowhere to turn to the time slot of the system port of alert data cell according to SNCP.
Wherein, said method also comprises: currently do not carry out the professional data cell that transmits and know when the link that carries out the professional data cell that transmits is unusual, saidly currently do not carry out the professional data cell that transmits and remove the alarm in the time slot of its corresponding system port.
Wherein, when said data cell is inserted alarm in the time slot of its corresponding system port, also block its corresponding system port.Current data cell of not carrying out the business transmission knows when the link that carries out the professional data cell that transmits is unusual that said current data cell of not carrying out professional transmission is also opened its corresponding system port.Through blocking the not system port of the data cell of transport service, thereby avoided the professional upset that transmits of client.
Wherein, Said method also comprises: said two data unit judge through link detecting whether link is unusual; And link-state information sent to cross board, said cross board sends to another data cell in said two data unit with the link-state information of each data cell.In addition, the said cross board fixed time is judged that this data cell Link State is unusual and informs another data cell when not receiving the link-state information of a data unit in said two data unit.
Wherein, corresponding veneer of each data cell.
Concrete technical scheme of the present invention is following:
When initial, through configuration, the veneer of the passage that dual homed is connected is elected work veneer (user port of this veneer is a work veneer port) as, and the veneer of another passage is elected protection veneer (user port of this veneer is protection veneer port) as.
When the two passes link all just often; When promptly all having normal transport service ability; Time slot a period of time or the constantly insertion alarm of protection veneer in its system port forces the passage of the time slot of SNCP selection work veneer system port as excellent receipts; Block the system port of protection veneer simultaneously, make it not receive the data that cross board sends over,, cause the upset of the data transmission of client to avoid these data forwarding to client.Meanwhile and in the from start to finish whole process, two veneers are respectively through the state of communication modes between plate with cross board transmission veneer.Through the state information transmission of cross board, make two veneers all be in correct running status in phase.
When link failure appears in the passage of protecting veneer; The protection veneer perceives link failure through the link detecting of the 802.3MAC port of user port; The protection veneer is to the information of cross board report " the protection single board service is unusual ", and cross board is passed on to the work veneer with this information again.The work veneer still keeps bearing professional the transmission.
When the protection veneer passage normal; The passage of work veneer is by normally becoming link failure; When the passage of work veneer does not possess the ability of normal transport service; The work veneer perceives link failure through the link detecting of the 802.3MAC port of user port; The work veneer will " work veneer service exception " report information give cross board, a period of time or insert alarm constantly in the time slot of the system port of this veneer simultaneously, force the time slot of system port that SNCP selects the protection veneer as the passage of excellent receipts; After the protection veneer obtains the information of " work veneer service exception " through cross board; Can remove alarm in the time slot of system port of this veneer (if the protection veneer inserts alarm in time slot in a period of time when initial; Then not alarm in time slot this moment; Thereby need not remove the alarm in the time slot), the while is no longer blocked the system port of this veneer.After carrying out above operation; The passage of protection veneer has been carried out and has been born the professional preparation that transmits; The SNCP of cross board also switches to business in the time slot of the system port of protecting veneer simultaneously, so professional just switching to continues on the passage of protecting veneer to transmit.
The passage that the passage of protection veneer is normally being born professional transmission and work veneer is normal, and when link failure appearred in the passage of protection veneer, its protection reversed process was the same.
Normally bearing the professional channel abnormal that transmits and protect veneer at the passage of work veneer; Or the passage of protection veneer normally bearing professional transmit and the situation of the channel abnormal of work veneer under; If the link of normal transport service breaks down; With not protecting the process of switching, and only transmit state separately to cross board.
Explanation is more clear understands that agreement of the present invention can be described through state in order to make; Below state machine is described in detail.Earlier several kinds of states that occur in the state machine are done explanation one by one:
In the above-mentioned table, veneer is in work, is meant that this veneer is current for the work veneer, and is professional current in this veneer transmission, and veneer is in protection and is meant that this veneer is current and is the protection veneer that business is not transmitted on this veneer.
1) the residing state of veneer has four kinds, is respectively veneer and is in work and does not have request, and veneer is in protection does not have request, and veneer is in the work auto switching, and veneer is in the protection auto switching.
The migration of single board state is by the service condition of veneer self with next common decision of the single board service state of EPS group; Veneer periodically sends service condition to cross board through communication modes between plate (for example HighWay line), and cross board is transmitted to another veneer with the EPS group again.The service condition of veneer then is the link detecting that is selected into the 802.3MAC port of the user port in the EPS group by veneer, or cross board is according to the situation of veneer in the EPS group to the service condition transfer delay decided.Below with reference to Fig. 2 each state is done explanation one by one.
Professional normal: the Link State that veneer detects the 802.3MAC port of EPS group user port is normal, and periodically this state value is sent to cross board, and cross board receives judges that then this single board state is for professional normal.Cross board can be transmitted to another veneer with the EPS group with this period of state property simultaneously.The said cycle can be 10ms, and the present invention does not limit this.
Service exception: divide two kinds of situation, the one, the Link State that veneer detects the 802.3MAC port of EPS group user port is disconnection, and periodically this state value is sent to cross board, cross board receives judges that then this single board state is a service exception; The 2nd, (suggestion 30ms can set as required) do not received veneer transmit status value in cross board one fixed response time, and then cross board judges that this single board state is a service exception.The reason that causes veneer one fixed response time not send this single board service state can be veneer power down, software fault etc.Cross board can be transmitted to another veneer with the EPS group with this period of state property.
In conjunction with Fig. 2, single board state is described, the master fixes with veneer and standby board among Fig. 2, refers in particular to a certain veneer, and the work veneer changes with the protection veneer, if veneer is current just at transport service, then is the work veneer, otherwise is the protection veneer.Each state of explanation and migration thereof below.
Veneer is in work; No solicited status: main initial condition with veneer; Or this veneer is current for the work veneer, and the service condition that inquires this veneer (current be work veneer) and protection veneer is normally professional, then triggers this veneer and moves to this state or keep this state.Bear professional the transmission at the veneer of this state, the alarm that needs system port to be stayed open and removes corresponding time slot is inserted.When the service condition of discontented unabridged version veneer (veneer of promptly working) and protection veneer is professional condition normally, single board state will move according to state machine.
Veneer is in protection; No solicited status: standby board initial condition; Or this veneer is current is the protection veneer, and the service condition that inquires this veneer (promptly protecting veneer) and work veneer be professional normally, then trigger veneer and move to this state or keep this state.Do not bear professional the transmission at the veneer of this state, need system port is kept shut and keeps corresponding time slot is inserted alarm.When the service condition of discontented unabridged version veneer (promptly protecting veneer) and work veneer is professional condition normally, single board state will move according to state machine.
Veneer is in work, auto switching: the master can be moved to this state with veneer or standby board.When veneer was the work veneer originally, and inquire the protection veneer when being service exception, will move to this state; When veneer was the protection veneer originally, inquires that it is professional normal, and during work veneer service exception, will move to this state; Be in this state (being in work, auto switching) when veneer is former, and when inquiring this veneer (veneer of promptly working) service exception, will keep this state constant.The veneer that is in this state need be born professional the transmission, needs system port is stayed open and keeps removing the alarm insertion of corresponding time slot.
Veneer is in protection, auto switching: the master can be moved to this state with veneer or standby board.When veneer was the protection veneer originally, and inquire the protection veneer when being service exception, will move to this state; When veneer was the work veneer originally, inquire its service exception, and the protection single board service just often, will move to this state; Be in this state (being in protection, auto switching) when veneer is former, and when inquiring this veneer (promptly protecting veneer) service exception, will keep this state constant.The veneer that is in this state is not born professional the transmission, needs system port is kept shut and keeps corresponding time slot is inserted alarm.
The present invention also provides a kind of Ethernet protection to switch the realization system, comprising: main with data cell, preliminary data unit and cross board, said master links to each other through system port with cross board with data cell; Said preliminary data unit links to each other through system port with cross board, wherein:
Said master is used for data cell or preliminary data unit: when this data cell is being carried out business when transmitting, if know that self link is unusual, in the time slot of its corresponding system port, insert alarm;
Said cross board is used for: select to carry out business transmission with nowhere to turn to the time slot of the system port of alert data cell according to SNCP.
Wherein, Said master also is used for data cell or preliminary data unit: do not carry out the business transmission when this data cell is current; And know when another link that is carrying out the professional data cell that transmits is unusual, saidly do not carry out the professional data cell that transmits and remove the alarm in the time slot of its corresponding system port.
Wherein, said master also is used for data cell or preliminary data unit: when the time slot of its corresponding system port inserts alarm, also block its corresponding system port.
Wherein, Said master also is used for data cell or preliminary data unit: do not carry out the business transmission when this data cell is current; And know that when another link that is carrying out the professional data cell that transmits was unusual, said data cell of not carrying out professional transmission was also opened its corresponding system port.
Wherein, said master also is used for data cell or preliminary data unit: judge through link detecting whether link is unusual, and link-state information is sent to cross board;
Said cross board also is used for: receive main link-state information with data cell or preliminary data unit feedback; Main link-state information with data cell is sent to the preliminary data unit, the link-state information of preliminary data unit is sent to lead use data cell.
Wherein, said cross board also is used for: when at the appointed time not receiving said master with the link-state information of data cell or preliminary data unit, judge that this data cell Link State is unusual and inform another data cell.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (12)
1. implementation method is switched in an Ethernet protection, it is characterized in that, comprising:
In two data unit that the Ethernet dual homed connects; Carrying out the professional data cell that transmits knows when self link is unusual; In the time slot of its corresponding system port, insert alarm, cross board is selected to carry out business transmission with nowhere to turn to the time slot of the system port of alert data cell according to SNCP.
2. the method for claim 1; It is characterized in that; Said method also comprises: currently do not carry out the professional data cell that transmits and know when the link that carries out the professional data cell that transmits is unusual, saidly currently do not carry out the professional data cell that transmits and remove the alarm in the time slot of its corresponding system port.
3. the method for claim 1 is characterized in that, said method also comprises, when said data cell is inserted alarm in the time slot of its corresponding system port, also blocks its corresponding system port.
4. method as claimed in claim 3; It is characterized in that; Current data cell of not carrying out the business transmission knows when the link that carries out the professional data cell that transmits is unusual that said current data cell of not carrying out professional transmission is also opened its corresponding system port.
5. like claim 2 or 4 described methods; It is characterized in that; Said method also comprises: said two data unit judge through link detecting whether link is unusual; And link-state information sent to said cross board, said cross board sends to another data cell in said two data unit with the link-state information of each data cell.
6. method as claimed in claim 5; It is characterized in that; Said method also comprises: the said cross board fixed time is judged that this data cell Link State is unusual and informs another data cell when not receiving the link-state information of a data unit in said two data unit.
7. the realization system is switched in an Ethernet protection, it is characterized in that, comprising: main with data cell, preliminary data unit and cross board, said master links to each other through system port with cross board with data cell; Said preliminary data unit links to each other through system port with cross board, wherein:
Said master is used for data cell or preliminary data unit: when this data cell is being carried out business when transmitting, if know that self link is unusual, in the time slot of its corresponding system port, insert alarm;
Said cross board is used for: select to carry out business transmission with nowhere to turn to the time slot of the system port of alert data cell according to SNCP.
8. system as claimed in claim 7; It is characterized in that; Said master also is used for data cell or preliminary data unit: do not carry out the business transmission when this data cell is current; And know when another link that is carrying out the professional data cell that transmits is unusual, saidly do not carry out the professional data cell that transmits and remove the alarm in the time slot of its corresponding system port.
9. system as claimed in claim 7 is characterized in that, said master also is used for data cell or preliminary data unit: when the time slot of its corresponding system port inserts alarm, also block its corresponding system port.
10. system as claimed in claim 9; It is characterized in that; Said master also is used for data cell or preliminary data unit: do not carry out the business transmission when this data cell is current; And know that when another link that is carrying out the professional data cell that transmits was unusual, said data cell of not carrying out professional transmission was also opened its corresponding system port.
11., it is characterized in that said master also is used for data cell or preliminary data unit like claim 8 or 10 described systems: judge through link detecting whether link is unusual, and link-state information is sent to cross board;
Said cross board also is used for: receive main link-state information with data cell or preliminary data unit feedback; Main link-state information with data cell is sent to the preliminary data unit, the link-state information of preliminary data unit is sent to lead use data cell.
12. system as claimed in claim 11; It is characterized in that; Said cross board also is used for: when at the appointed time not receiving said master with the link-state information of data cell or preliminary data unit, judge that this data cell Link State is unusual and inform another data cell.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110095468.XA CN102739430B (en) | 2011-04-15 | 2011-04-15 | Method and system for realizing Ethernet protection switching |
| PCT/CN2012/072624 WO2012139452A1 (en) | 2011-04-15 | 2012-03-20 | Ethernet protection switching implementation method and system |
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| CN201110095468.XA CN102739430B (en) | 2011-04-15 | 2011-04-15 | Method and system for realizing Ethernet protection switching |
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| CN102739430A true CN102739430A (en) | 2012-10-17 |
| CN102739430B CN102739430B (en) | 2017-04-12 |
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| WO2012139452A1 (en) | 2012-10-18 |
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