CN102917286B - Hand-in-hand protection switching method and system in EPON (Ethernet Passive Optical Network) - Google Patents
Hand-in-hand protection switching method and system in EPON (Ethernet Passive Optical Network) Download PDFInfo
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- CN102917286B CN102917286B CN201210468757.4A CN201210468757A CN102917286B CN 102917286 B CN102917286 B CN 102917286B CN 201210468757 A CN201210468757 A CN 201210468757A CN 102917286 B CN102917286 B CN 102917286B
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Abstract
The invention relates to a hand-in-hand protection switching method and system in an EPON (Ethernet Passive Optical Network). At a user side, a single PON MAC (media access control entity) is combined with a double-optical module ONU (optical network unit), a hand-in-hand protection group is established on each OLT (optical line terminal) at each of two ends, and (1+1) whole protection is realized, after the protection groups are successively established, a user sends configuration data of the ONU to any one of OLTs through an NMS (network management system), two PON ports of the ONU are respectively connected to corresponding PON ports of the OLTs at two ends, and when a fault exists, the ONU completes fault detection, switches to the PON port at the other side to continuously work from the currently working PON port, is free of registration in the switching process, and reports the switching event after the switching is completed. The method and system provdied by the invention adopts the ONU of a PON MAC type, and combines the functions of configuration management, switching control, data synchronization and state maintenance of the OLT, thus realizing stable and reliable hand-in-hand protection switching and greatly reducing power consumption and cost.
Description
Technical field
The present invention relates to the pretection switch (the PON pretection switch in Ethernet passive optical network) hand in hand in EPON connecting system (referred to as EPON system), is the pretection switch method and system hand in hand in a kind of EPON connecting system specifically.
Background technology
Ethernet passive optical network (Ethernet Passive Optical Network, EPON) incorporates general ethernet technology and cheap Passive Optical Components, is the novel optical fiber access network technology of a kind of low cost, high power capacity.It adopts point-to-multipoint structure, passive fiber to transmit, can the multiple business such as supported data, voice and video simultaneously.Therefore, it combines the advantage of PON technology and ethernet technology: low cost, high bandwidth, autgmentability are high, compatibility is strong, convenient management, service bearer mode are flexible.
Typical EPON system (EPON connecting system) is made up of optical line terminal (OLT), optical network unit (ONU) and optical distribution (ODN).OLT(Optical Line Terminal) centre machine room, the optical fiber interface towards passive optical-fiber network is provided.ONU(OpticalNetwork Unit) be ustomer premises access equipment, mainly adopt Ethernet protocol, the business such as broadband voice, data or video are provided for user.ODN(Optical Distributed Network) connect OLT and ONU primarily of one or several optical branching device (Splitter is also called optical splitter), its function is distribution downlink data and concentrates upstream data.ODN adopts passive device, can be placed in round-the-clock environment.
Along with a large amount of deployment of EPON system, increasing crucial application is carried by EPON, and the reliability of operator to EPON system proposes very high requirement.The factor of influential system reliability mainly contains:
(1) fiber cut or optical path signal Quality Down;
(2) optical module fault or transmitting-receiving hydraulic performance decline;
(3) OLT or ONU hardware fault.
For reply the problems referred to above, operator not only needs the trunk optical fiber disposed in single OLT to switch and fully protective switching, more needs to support the dual-homing networking mode of ONU between multiple stage OLT, pretection switch mode of namely handing in hand.
In OLT side, existing networking mode hand in hand as shown in Figure 1, need ensure that dual-homed ONU has same configuration data on two OLT.Under normal circumstances, Business Stream is by side PON MAC(PON medium access control-entity) forward between ONU and OLT, when there is light path or equipment failure, ONU auto switching continues bearer service to opposite side PON MAC.This hand in hand pretection switch needs the ONU using two PON MAC to be equipped with two optical module type to carry out networking, and two PON MAC of ONU register respectively on two OLT, Hot Spare each other.The shortcoming of this scheme is: the ONU structure of two PON MAC is comparatively complicated, power consumption and cost higher; Usual needs manually ensure that the configuration data of two PON MAC is identical, and the workload that equipment is opened and safeguarded is larger.
Summary of the invention
For the defect existed in prior art; the object of the present invention is to provide the pretection switch method and system hand in hand in a kind of EPON connecting system; by using relative low price and the less single PON MAC type ONU of power consumption substitutes couple PON MAC type ONU; realize the PON pretection switch mode hand in hand of low cost; reduce lower deployment cost and the whole network power consumption of EPON network hand in hand; simplified network configures; can not only the product competitiveness of lifting means manufacturer, also meet the requirement of the environmental protection network that Virtual network operator proposes.
For reaching above object, the technical scheme that the present invention takes is:
A kind of pretection switch method hand in hand in EPON connecting system; it is characterized in that: adopt single PON MAC to be equipped with the optical network unit ONU of two optical module type in user side; two ends optical line terminal OLT creates protection group hand in hand; and the PON port of two on the OLT of two ends is incorporated to into one and hand in hand realize 1+1 full guard in protection group
Protection group creates successfully hand in hand, and user issues configuration data any one end OLT in protection group of ONU by network management system NMS,
Two of optical network unit ONU PON ports are connected respectively to the corresponding PON port of two ends OLT,
During normal work, ONU selects one of them PON port bearer service, sets up and manage connection hand in hand between the OLT of two ends, and the ONU configuration data between two PON ports on ONU and status data pass through administrative message real-time synchronization hand in hand,
When fault occurs, complete fault detect, work on from the PON port switching of work at present to opposite side PON port by ONU, in the process of switching, ONU does not go registration, and its business carried can be recovered immediately, and after having switched, ONU reports to OLT the event of switching.
On the basis of technique scheme, described protection group hand in hand identifies with " managing I P, line card slot number, PON slogan " tlv triple, has the protection group number that the overall situation is unique.
On the basis of technique scheme, after the configuration data of ONU is issued to OLT device, by the upper preservation of management Connection-copy to the two ends OLT in protection group hand in hand, to ensure that the configuration of identical ONU on the OLT of two ends is consistent.
On the basis of technique scheme, described configuration data at least comprises: the mandate of ONU, band width configuration, port vlan.
On the basis of technique scheme, by the management operating state of all ONU links of connection monitoring at two ends between OLT, the OLT mutually protected by the two ends ONU that cooperate configures and recovering state.
On the basis of technique scheme, the concrete steps of pretection switch are as follows:
Two ends OLT among A, protection group is by direct-connected or set up physical connection through exchange; OLT connects by setting up management between the two ends OLT of configuration management IP among protection group, is used for carrying administrative message hand in hand;
B, on the OLT of two ends successively configuration protection group hand in hand successively, with PON mouth for granularity carries out 1+1 protection; During configuration, joined OLT and first connected by management, detected the configuration status of opposite end; If opposite end not yet configures, then wait for that the other side is configured; If opposite end has been waiting state, is then held consultation range finding by hand in hand management connection, determined the distance measurement value RTT of ONU under the OLT PON mouth of two ends;
The PON mouth protected mutually in C, two ends OLT is operating conditions, the logical links that arbitrary PON mouth is registered, line card is all synchronized to opposite end PON mouth by management connection, and as virtual logical link registration, but RTT value is then used in the distance measurement value of this logical links that opposite end PON mouth learns; OLT is the LLID LLID that every bar link assignment is different, and be also synchronized to opposite end by management connection, the LLID that same link is distributed on the OLT of two ends is identical; On PON mouth, the ONU of actual registered is in operating conditions active, and the ONU of virtual registration is in state standby for subsequent use; Line card is that every bar logical links all creates static link data, order that the ONU simultaneously to operating conditions issues " state keeps holdover ", and during to ensure to switch generation, ONU can not fall registration, the fast quick-recovery of business energy;
ONU link information on D, two ends OLT has completed synchronously, and therefore both sides OLT all can find identical ONU set; The ONU that webmaster issues by OLT authorizes and business configuration write line card buffer memory, and is synchronized to opposite end OLT, and which ensure that the identical ONU of both sides OLT has identical business configuration, this i.e. configuring redundancy;
After E, line card receive ONU configuration, upgrade local configuration data structure, issuing of actual disposition data is processed by configuration task; For the ONU of operating conditions, directly issue configuration to ONU, and synchronous configuration flag bit is to PON mouth for subsequent use; For the ONU of state for subsequent use, do not issue actual disposition;
F, when there is equipment fault or light path deterioration, trigger ONU PON mouth and switch, the static link state on OLT changes; Line card upgrades local data states and reports to webmaster the event of switching after detecting that Link State changes;
G, two ends OLT line card connect alarm and other various dynamic datas of synchronous ONU by management;
The timing of H, line card detects the Link State under protection group PON mouth, is compared by the Link State under the PON mouth of management connection acquisition opposite end and local state simultaneously; If the state at two ends is state for subsequent use, then should be that ONU falls registration, line card all deletes the static link configuration of this ONU under the PON mouth of both sides, simultaneously reports ONU to go offline alarm to webmaster;
After I, line card are restarted, the protection group that first reception main control card issues configures and ONU authorizes, subsequently by management connection, to opposite end OLT line card transmission " synchronization request Sync Request "; The line card receiving synchronization request is then connected to the synchronous all ONU links of requestor, alarm, configuration flag bit and other dynamic datas by management;
J, protection group delete time, line card all under deleting protection group PON mouth static link configuration, simultaneously by PON mouth recovering state to unprotect state.
Adopt the pretection switch system hand in hand in the EPON connecting system of said method, it is characterized in that, comprising: optical line terminal OLT and single PON MAC are equipped with the optical network unit ONU of two optical module type,
Between OLT and ONU by 1:N optical branching device be connected, form full optical protection switching topological structure, N be greater than 2 positive integer,
Two optical modules of described optical network unit ONU are connected respectively by the PON mouth that 1:N optical branching device is corresponding with OLT,
When normally working, ONU selects an OLT PON mouth to register by the normal optical module of light path, and another optical module then closes luminous TX, is in cold standby state,
When the light path of normal work break down or deterioration time, ONU auto switching continues bearer service to another optical module, the change that OLT perception ONU Link State occurs, and produces and relevant switch event.
On the basis of technique scheme, described OLT is provided with main control card and EPON line card, and protection group is created between any PON mouth of any slot line card hand in hand,
Two ends OLT in protection group is by direct-connected or set up physical connection through exchange.
On the basis of technique scheme, the OLT in described system comprises: Configuration Manager, data simultaneous module, switching control module and state-maintenance module, totally 4 functional modules,
Configuration Manager preserve webmaster assign configuration data, realize the synchronous logic of configuration data between protection group OLT and complete issuing the configuration data of ONU,
Data simultaneous module is provided in interface and the passage of synchrodata between protection group OLT,
Switching control module detection failure also completes switching action,
The working condition of state-maintenance module monitors protection group also realizes the synchronous logic of status data between protection group OLT.
Pretection switch method and system hand in hand in EPON connecting system of the present invention; by using relative low price and the less single PON MAC type ONU of power consumption substitutes couple PON MAC type ONU; realize the PON pretection switch mode hand in hand of low cost; reduce lower deployment cost and the whole network power consumption of EPON network hand in hand; simplified network configures; can not only the product competitiveness of lifting means manufacturer, also meet the requirement of the environmental protection network that Virtual network operator proposes.
Pretection switch method and system hand in hand in EPON connecting system of the present invention; the ONU of single PON MAC type is adopted to replace the ONU of two PON MAC type; be aided with the configuration management of OLT, switching control, data syn-chronization and state-maintenance function; both achieve reliable and stable pretection switch hand in hand, also greatly reduce power consumption and cost.EPON reliability of service can not only be improved, greatly can also reduce the networking cost of operator.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 is that existing EPON system is handed in hand pretection switch networking diagram;
Fig. 2 is EPON system of the present invention (EPON connecting system) pretection switch networking diagram hand in hand;
Fig. 3 is pretection switch configuration flow schematic diagram hand in hand of the present invention;
Fig. 4 is protection group link hand in hand of the present invention registration, removes the synchronous flow chart of log-on message; Wherein, Fig. 4. (a) is link registration, Fig. 4. (b) for link go registration;
Fig. 5 be in the present invention hand in hand under protection group the configuration data of ONU issue schematic flow sheet;
Fig. 6 is Link State maintenance process schematic diagram in protection group in the present invention;
Fig. 7 is the system composition schematic diagram of EPON system of the present invention (EPON connecting system) hand in hand pretection switch.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 2,3; pretection switch method hand in hand in EPON connecting system of the present invention; adopt single PON MAC to be equipped with the optical network unit ONU of two optical module type in user side; two ends optical line terminal OLT creates protection group (implication at " two ends " refers to the two ends OLT of the mutual protection that user is configured by network management system NMS herein) hand in hand; and the PON port of two on the OLT of two ends is incorporated to into one and hand in hand realize 1+1 full guard in protection group
Protection group creates successfully hand in hand, and user issues configuration data any one end OLT in protection group of ONU by network management system NMS,
Two of optical network unit ONU PON ports are connected respectively to the corresponding PON port of two ends OLT,
During normal work, ONU selects one of them PON port bearer service, sets up and manage connection hand in hand between the OLT of two ends, and the ONU configuration data between two PON ports on ONU and status data pass through administrative message real-time synchronization hand in hand,
When fault occurs, complete fault detect, work on from the PON port switching of work at present to opposite side PON port by ONU, in the process of switching, ONU does not go registration, and its business carried can be recovered immediately, and after having switched, ONU reports to OLT the event of switching.
The method of the invention, by arranging protection group hand in hand in the EPON optical line terminal OLT of two ends, realizes the 1+1 fully protective switching function of PON mouth rank between the OLT machine frame of two ends; Connected by the management increased on OLT between machine frame, complete automatically copying of ONU configuration data; The link of registration on the OLT of two ends and state information are by administrative message real-time synchronization of handing in hand.
On the basis of technique scheme, described protection group hand in hand identifies with " managing I P, line card slot number, PON slogan " tlv triple, has the protection group number that the overall situation is unique.
On the basis of technique scheme, after the configuration data of ONU is issued to OLT device, by the upper preservation of management Connection-copy to the two ends OLT in protection group hand in hand, to ensure that the configuration of identical ONU on the OLT of two ends is consistent.
On the basis of technique scheme, described configuration data at least comprises: the mandate of ONU, band width configuration, port vlan.
On the basis of technique scheme, by the management operating state of all ONU links of connection monitoring at two ends between OLT, the OLT mutually protected by the two ends ONU that cooperate configures and recovering state.
On the basis of technique scheme, the concrete steps of pretection switch are as follows:
Two ends OLT among A, protection group is by direct-connected or set up physical connection through exchange; OLT connects by setting up management between the two ends OLT of configuration management IP among protection group, is used for carrying administrative message hand in hand;
Preferably, between described OLT, management connects for TCP mode connects hand in hand, and when protection group creates, data simultaneous module sets up the connection with opposite end, and safeguards its validity; When protection group is deleted, delete this simultaneously and connect; Same OLT with can be connected with setting up to manage between multiple stage OLT simultaneously;
B, on the OLT of two ends successively configuration protection group hand in hand successively, with PON mouth for granularity carries out 1+1 protection; During configuration, joined OLT and first connected by management, detected the configuration status of opposite end; If opposite end not yet configures, then wait for that the other side is configured; If opposite end has been waiting state, is then held consultation range finding by hand in hand management connection, determined the distance measurement value RTT(Round Trip Time of ONU under the OLT PON mouth of two ends);
The PON mouth protected mutually in C, two ends OLT is operating conditions, the logical links that arbitrary PON mouth is registered, line card is all synchronized to opposite end PON mouth by management connection, and as virtual logical link registration, but RTT value is then used in the distance measurement value of this logical links that opposite end PON mouth learns; OLT is the LLID LLID that every bar link assignment is different, and be also synchronized to opposite end by management connection, the LLID that same link is distributed on the OLT of two ends is identical; On PON mouth, the ONU of actual registered is in operating conditions active, and the ONU of virtual registration is in state standby for subsequent use; Line card is that every bar logical links (no matter being physical link or virtual link) all creates static link data, order that the ONU simultaneously to operating conditions issues " state keeps holdover ", and during to ensure to switch generation, ONU can not fall registration, the fast quick-recovery of business energy;
ONU link information on D, two ends OLT has completed synchronously, and therefore both sides OLT all can find identical ONU set; The ONU that webmaster issues by OLT authorizes and business configuration write line card buffer memory, and is synchronized to opposite end OLT, and which ensure that the identical ONU of both sides OLT has identical business configuration, this i.e. configuring redundancy;
After E, line card receive ONU configuration, upgrade local configuration data structure, issuing of actual disposition data is processed by configuration task; For the ONU of operating conditions, directly issue configuration to ONU, and synchronous configuration flag bit is to PON mouth for subsequent use; For the ONU of state for subsequent use, do not issue actual disposition;
F, when there is equipment fault or light path deterioration, trigger ONU PON mouth and switch, the static link state on OLT changes; Line card upgrades local data states and reports to webmaster the event of switching after detecting that Link State changes;
G, two ends OLT line card connect alarm and other various dynamic datas of synchronous ONU by management; Described dynamic data at least comprises: the MAC Address that Link State, LLID information, distance measurement value, study arrive;
The timing of H, line card detects the Link State under protection group PON mouth, is compared by the Link State under the PON mouth of management connection acquisition opposite end and local state simultaneously; If the state at two ends is state for subsequent use, then should be that ONU falls registration, line card all deletes the static link configuration of this ONU under the PON mouth of both sides, simultaneously reports ONU to go offline alarm to webmaster;
After I, line card are restarted, the protection group that first reception main control card issues configures and ONU authorizes, subsequently by management connection, to opposite end OLT line card transmission " synchronization request Sync Request "; The line card receiving synchronization request is then connected to the synchronous all ONU links of requestor, alarm, configuration flag bit and other dynamic datas by management;
J, protection group delete time, line card all under deleting protection group PON mouth static link configuration, simultaneously by PON mouth recovering state to unprotect state.
Wherein said steps A, management connects to be responsible for setting up and safeguarding, for receiving and dispatching synchrodata between the OLT line card of two ends by master control borad.Line card sends to master control borad by needing the data encapsulation sent in communication between plates message, is forwarded to opposite end OLT, is given terminal wiring card more subsequently by communication between plates protocol forward by management connection.
Wherein said step B, protection group configures respectively on two OLT entities of webmaster hand in hand, the physical address using (managing I P, slot number, PON slogan) tlv triple as protection mutually.During configuration, the legitimacy of reply tlv triple verifies.
Wherein said step C, in protection group two ends OLT PON mouth on adopt different LLID allocation strategies, during to ensure that multilink is registered on the OLT of two ends simultaneously, do not produce LLID distribution conflict.
Wherein for step e, in system operation, the ONU configuration task cycle performs repeatedly, and each execution cycle determines whether issuing configuration according to the operating state of configuration flag bit and ONU.
Wherein for step G, dynamic data refers to various flag bit or the data table items of dynamically generation in system operation, as MAC Address, multicast member list item etc. that alarm, event, study are arrived.The state in protection group that makes of these data of dynamic synchronization is consistent, and is conducive to the fast quick-recovery of business.
Wherein for step H, the while that Link State detection being the line card of two ends OLT, repeatedly carry out, but there is negotiation mechanism each other, when side line card process, opposite side line card then skips this process.
The present invention gives the system of the pretection switch hand in hand in a kind of EPON connecting system, as shown in Figure 2, comprising: optical line terminal OLT and single PON MAC are equipped with the optical network unit ONU of two optical module type,
Between OLT and ONU by 1:N optical branching device be connected, form full optical protection switching topological structure, N be greater than 2 positive integer,
Two optical modules of described optical network unit ONU are connected respectively by the PON mouth that 1:N optical branching device is corresponding with OLT,
When normally working, ONU selects an OLT PON mouth to register by the normal optical module of light path, another optical module then closes luminous TX, be in cold standby state, ONU switches logic according to himself, the PON mouth of two OLT is selected a light path that can normally work register, the state information of ONU keeps synchronous on these two OLT PON mouths, namely when registration on one of them PON mouth in protection group of ONU or when going registration, it is registered or goes log-on message meeting automatic synchronization on another PON mouth in protection group, therefore the PON mouth of two ends OLT can find identical ONU set,
When the light path of normal work break down or deterioration time, ONU auto switching continues bearer service to another optical module, the change that OLT perception ONU Link State occurs, and produces and relevant switch event.
System of the present invention comprises two OLT, multiple stage ONU and multiple 1:N optical splitter.Concrete condition is as follows: mutually redundant two ends optical line terminal (OLT A, OLT B) and optical network unit at remote side (ONU
1~ ONU
n), be connected with 1:N optical branching device (X with Y) between OLT and ONU and help light path protection topological structure, by direct-connected or set up physical connection (m) through exchange between the OLT of two ends.Be different from traditional design of PON pretection switch hand in hand; the present invention uses the ONU of single PON MAC, two optical module; the configuration management of OLT, data syn-chronization, switching control and state-maintenance module is coordinated to set up pretection switch network hand in hand; two OLT respectively go out 1 end PON mouth and form a 1+1 protection group; two PON ports of every platform ONU are connected with the fibre of joining of two optical splitters; two optical splitters are connected with the OLT PON mouth of two in protection group respectively, form full optical protection switching topology.
System of the present invention, manages connection by setting up hand in hand between OLT machine frame, realizes ONU configuration and status data automatic synchronization mechanism, enables OLT coordinate single PON MAC, the ONU of two optical module sets up network of handing in hand.
On the basis of technique scheme, described OLT is provided with main control card and EPON line card, and protection group is created between any PON mouth of any slot line card hand in hand,
Two ends OLT in protection group is by direct-connected or set up physical connection through exchange.
Preferably, described protection group can be based upon between any PON mouth of any slot line card in two OLT, and same OLT can carry out protection group configuration with other OLT of multiple stage simultaneously.
On the basis of technique scheme, the OLT in described system comprises: Configuration Manager, data simultaneous module, switching control module and state-maintenance module, totally 4 functional modules,
Configuration Manager preserve webmaster assign configuration data, realize the synchronous logic of configuration data between protection group OLT and complete issuing the configuration data of ONU,
Data simultaneous module is provided in interface and the passage of synchrodata between protection group OLT,
Switching control module detection failure also completes switching action,
The working condition of state-maintenance module monitors protection group also realizes the synchronous logic of status data between protection group OLT.
Such as: Configuration Manager, the protection group that preservation webmaster issues configures and ONU configures and copies between protection group, by ONU configuration distributing to far-end ONU equipment; Switching control module, when detecting abnormal, ONU auto switching is to light path for subsequent use, and OLT detects switching event and arranging correlating markings position of ONU; Data simultaneous module, safeguard management between the OLT of two ends connect and between protection group synchronous various dynamic data; State-maintenance module, safeguards protection group state, monitors the working condition of all ONU links on the PON mouth of two ends, carries out recovering state if desired.
Preferably, described Configuration Manager can configure according to protection group, by the opposite end PON mouth of the ONU configuration replication under PON mouth any in line card any in OLT to protection group.
Preferably, described switching control module supports auto switching and Forced Switch.Described Forced Switch switches order for being issued by webmaster, notice ONU switch operating light path.The situation that switching control module is switched according to ONU, upgrades the operating state of OLT link.
Preferably, described data simultaneous module is the task of cycle execution in system, carries out periodic synchronization to the various dynamic datas produced when running.
Preferably, described state-maintenance module is the task of cycle execution in system, regularly monitors the operating state of ONU in protection group and preserves.When from (recovering after fibre as disconnected in ONU, power down or line card power down) during abnormal restoring, the state before abnormal generation can be automatically restored to.
See Fig. 2, the present invention proposes a kind of EPON connecting system and to hand in hand the networking mode of pretection switch.Protection group is set up between two optical line terminals (OLT) hand in hand, and two PON mouths of protection mutually can be any PON ports of any EPON line card on two OLT, are connected respectively to 1:N optical splitter X and Y by optical fiber #1 and optical fiber #2.Optical network unit (ONU) in system is two optical module, single PON MAC type ONU.The optical module A of ONU1 ~ ONUn connects the tail optical fiber X1 ~ Xn of optical splitter X respectively, and the optical module B of ONU1 ~ ONUn connects the tail optical fiber Y1 ~ Yn of optical splitter Y respectively.Business datum is converged to first line of a couplet switch by first line of a couplet circuit a and b by OLT A and OLT B.Be connected by management channels m between OLT A and OLT B, this passage is responsible for carrying and is managed connection hand in hand, is used for synchrodata between two OLT.
See Fig. 3, show and of the present inventionly switch hand in hand protection group configuration flow, comprising:
301: the protection group parameter hand in hand receiving network management configuration.Protection group identifies with " managing I P, line card slot number, PON slogan " tlv triple, has the protection group number that the overall situation is unique.Set up by managing I P between OLT and manage connection hand in hand;
302: protection group configures respectively on the OLT of two ends hand in hand.When certain end OLT starts to configure, first connected by management, inquiry opposite end configuring condition, configures hand in hand if opposite end have received and is in waiting state, then can continue configuration flow, otherwise being self enter waiting state 306;
303: connected by management, carry out ONU distance measurement value (RTT) with Peer Negotiation and learn.Line card by study to RTT value record in link information table;
304: corresponding for local terminal OLT PON mouth is opened, and to arrange local terminal state be operating conditions;
305: webmaster is handed down to ONU configuration synchronization under local terminal PON mouth to the ONU object under the PON mouth of opposite end.
Preferably, the range finding learning process described in above-mentioned 303 is, makes all ONU register under the OLT PON mouth of two ends respectively, determines the distance measurement value of ONU under the OLT of two ends according to log-on message.
Said method provided by the invention is connected by the management of setting up between OLT, coordinates two ends OLT and carries out respectively finding range and entering operating state, be configured between the OLT of two ends by the ONU that webmaster issues simultaneously and carry out automatic synchronization, effectively reduce the complexity of human configuration.
See Fig. 4, show protection group link registration hand in hand, go the synchronous flow process of log-on message:
Wherein scheme (a) and show the synchronous flow process of link registration, comprising:
401: receive link registration from PON chip;
402: judge that this message is registration message spontaneous on local terminal PON mouth by flag bit, or the registration message synchronously come in opposite end;
403: if this message is registration message spontaneous on local terminal PON mouth, then synchronous mark position is set and by this message synchronization to opposite end;
404: according to this registration message, upgrade the link information table of local terminal.The data of preserving in link information table comprise link MAC, LLID value and RTT value;
405: in PON chip, write static link, to make OLT maintain link configuration, when not gone registration in link generation reversed process;
406: synchronously come if the link registration received is opposite end, then the RTT value of this link is changed into the RTT value that this link learns we, then write static link and upgrade link information table.
Wherein scheme (b) to show link and go to register synchronous flow process, comprising:
407: receive link from PON chip and remove registration message;
408: judge that this message spontaneously on local terminal PON mouth removes registration message by flag bit, or opposite end synchronously come remove registration message;
409: if this message spontaneously on local terminal PON mouth removes registration message, then this message synchronous is to opposite end OLT;
410: from the link information table of local terminal, delete this link entry;
411: from local terminal PON chip, delete the configuration of its static link, ONU is treated to registration.
Said method provided by the invention makes the log-on message of the ONU of single PON MAC type synchronously configure on the OLT of two ends, and when switching generation, Link State changes, but ONU can not fall registration, and business also can quick-recovery soon.
See Fig. 5, show the business configuration of ONU under hand in hand protection group and issue flow process, comprising:
501: judge that the operating state of ONU is in " operating conditions " or " state for subsequent use ".If be in " state for subsequent use ", then terminate this configuration flow;
502: if be in operating conditions, then judge whether the flag bit of this business configuration is " configuring " further.If be " configuring ", then terminate this configuration flow;
503: if this business configuration flag bit is " configuration ", then issuing service configures to ONU.If configuration distributing failure, then terminate this configuration flow;
504: if configuration distributing success, then flag bit is set for " configuring ";
505: configuration flag bit is synchronized to the ONU object under the PON mouth of opposite end.
501 ~ 505 collocation methods provided are a single configuration flow, and in implementation process, this flow process, by independent task control, performs repeatedly.Carry out the ONU configuration distributing action in Control protection group according to the operating state of ONU and relevant configuration flag bit, can guarantee that being configured on the OLT of two ends of same ONU can not repeat to issue.
See Fig. 6, show the flow process that in protection group of handing in hand, Link State is safeguarded, comprising:
601: by the operating state of all links under management channels acquisition opposite end OLT;
602: the operating state of respective links under acquisition local terminal OLT;
603: for a certain link, its two state values under the OLT of two ends of comparison;
604: if two state values are that a master one is standby, then think that antenna efficiency is normal, jump out process;
605,606: if two state values are identical, and be all state for subsequent use, then link is in login state, delete the static link configuration of this ONU, go offline ONU process;
607: if two state values are all primary state, then belong to abnormality, enter abnormality processing.
The present invention also has independent task control, and above-mentioned flow process performs repeatedly, realizes the dynamic diagnosis to Link States all in protection group.
See Fig. 7, show the system schematic of pretection switch hand in hand.Described system comprises optical line terminal OLT A and OLT B, two optical module is equipped with single MAC type optical network unit ONU, optical distribution network ODN and network management system NMS.Wherein, described OLT comprises Configuration Manager, switching control module, data simultaneous module and state-maintenance module, and described ONU comprises switching control module, and described NMS can manage multiple stage OLT system simultaneously.OLT side, data simultaneous module safeguards that the management between the OLT of two ends connects.NMS is by all ONU configuration distributings to the Configuration Manager of OLT, and this module preserves configuration data and the opposite end OLT be synchronously configured to by data simultaneous module in protection group.Switching control module in charge detects the operating state of all ONU links, is updated to state-maintenance module.State-maintenance module preserves the various dynamic datas comprising ONU Link State, is synchronized to opposite end by data simultaneous module.ONU side, when ONU detects optical link deterioration or receives Forced Switch order, switches primary, spare light path by switching control module, uses identical PON MAC to be switched on other end OLT normally work when not falling registration.The hand in hand exchanging system that the present invention proposes introduces management connection between OLT and sync cap; overcome separate configurations between the existing OLT of protection hand in hand, two PON MAC must be used to carry out the shortcoming of bearer service, reduce business configuration workload, provide cost savings, reduce equipment power dissipation.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. the pretection switch method hand in hand in an EPON connecting system; it is characterized in that: adopt single PON MAC to be equipped with the optical network unit ONU of two optical module type in user side; two ends optical line terminal OLT creates protection group hand in hand; and the PON port of two on the OLT of two ends is incorporated to into one and hand in hand realize 1+1 full guard in protection group
Protection group creates successfully hand in hand, and user issues configuration data any one end OLT in protection group of ONU by network management system NMS,
Two of optical network unit ONU PON ports are connected respectively to the corresponding PON port of two ends OLT,
During normal work, ONU selects one of them PON port bearer service, sets up and manage connection hand in hand between the OLT of two ends, and the ONU configuration data between two PON ports on ONU and status data pass through administrative message real-time synchronization hand in hand,
When fault occurs, complete fault detect, work on from the PON port switching of work at present to opposite side PON port by ONU, in the process of switching, ONU does not go registration, and its business carried can be recovered immediately, and after having switched, ONU reports to OLT the event of switching;
The concrete steps of pretection switch are as follows:
Two ends OLT among A, protection group is by direct-connected or set up physical connection through exchange; OLT connects by setting up management between the two ends OLT of configuration management IP among protection group, is used for carrying administrative message hand in hand;
B, on the OLT of two ends successively configuration protection group hand in hand successively, with PON mouth for granularity carries out 1+1 protection; During configuration, joined OLT and first connected by management, detected the configuration status of opposite end; If opposite end not yet configures, then wait for that the other side is configured; If opposite end has been waiting state, is then held consultation range finding by hand in hand management connection, determined the distance measurement value RTT of ONU under the OLT PON mouth of two ends;
The PON mouth protected mutually in C, two ends OLT is operating conditions, the logical links that arbitrary PON mouth is registered, line card is all synchronized to opposite end PON mouth by management connection, and as virtual logical link registration, but RTT value is then used in the distance measurement value of this logical links that opposite end PON mouth learns; OLT is the LLID LLID that every bar link assignment is different, and be also synchronized to opposite end by management connection, the LLID that same link is distributed on the OLT of two ends is identical; On PON mouth, the ONU of actual registered is in operating conditions active, and the ONU of virtual registration is in state standby for subsequent use; Line card is that every bar logical links all creates static link data, order that the ONU simultaneously to operating conditions issues " state keeps holdover ", and during to ensure to switch generation, ONU can not fall registration, the fast quick-recovery of business energy;
ONU link information on D, two ends OLT has completed synchronously, and therefore both sides OLT all can find identical ONU set; The ONU that webmaster issues by OLT authorizes and business configuration write line card buffer memory, and is synchronized to opposite end OLT, and which ensure that the identical ONU of both sides OLT has identical business configuration, this i.e. configuring redundancy;
After E, line card receive ONU configuration, upgrade local configuration data structure, issuing of actual disposition data is processed by configuration task; For the ONU of operating conditions, directly issue configuration to ONU, and synchronous configuration flag bit is to PON mouth for subsequent use; For the ONU of state for subsequent use, do not issue actual disposition;
F, when there is equipment fault or light path deterioration, trigger ONU PON mouth and switch, the static link state on OLT changes; Line card upgrades local data states and reports to webmaster the event of switching after detecting that Link State changes;
G, two ends OLT line card connect alarm and other various dynamic datas of synchronous ONU by management;
The timing of H, line card detects the Link State under protection group PON mouth, is compared by the Link State under the PON mouth of management connection acquisition opposite end and local state simultaneously; If the state at two ends is state for subsequent use, then should be that ONU falls registration, line card all deletes the static link configuration of this ONU under the PON mouth of both sides, simultaneously reports ONU to go offline alarm to webmaster;
After I, line card are restarted, the protection group that first reception main control card issues configures and ONU authorizes, subsequently by management connection, to opposite end OLT line card transmission " synchronization request Sync Request "; The line card receiving synchronization request is then connected to the synchronous all ONU links of requestor, alarm, configuration flag bit and other dynamic datas by management;
J, protection group delete time, line card all under deleting protection group PON mouth static link configuration, simultaneously by PON mouth recovering state to unprotect state.
2. the pretection switch method hand in hand in EPON connecting system as claimed in claim 1, is characterized in that: described protection group hand in hand identifies with " managing I P, line card slot number, PON slogan " tlv triple, has the protection group number that the overall situation is unique.
3. the pretection switch method hand in hand in EPON connecting system as claimed in claim 1; it is characterized in that: after the configuration data of ONU is issued to OLT device; preserve by managing hand in hand on Connection-copy to the two ends OLT in protection group, to ensure that the configuration of identical ONU on the OLT of two ends is consistent.
4. the pretection switch method hand in hand in EPON connecting system as claimed in claim 1, is characterized in that: described configuration data at least comprises: the mandate of ONU, band width configuration, port vlan.
5. the pretection switch method hand in hand in EPON connecting system as claimed in claim 1; it is characterized in that: by the management operating state of all ONU links of connection monitoring at two ends between OLT, the OLT mutually protected by the two ends ONU that cooperate configures and recovering state.
6. adopt the pretection switch system hand in hand in the EPON connecting system of method described in claim 1, it is characterized in that, comprising: optical line terminal OLT and single PON MAC are equipped with the optical network unit ONU of two optical module type,
Between OLT and ONU by 1:N optical branching device be connected, form full optical protection switching topological structure, N be greater than 2 positive integer,
Two optical modules of described optical network unit ONU are connected respectively by the PON mouth that 1:N optical branching device is corresponding with OLT,
When normally working, ONU selects an OLT PON mouth to register by the normal optical module of light path, and another optical module then closes luminous TX, is in cold standby state,
When the light path of normal work break down or deterioration time, ONU auto switching continues bearer service to another optical module, the change that OLT perception ONU Link State occurs, and produces and relevant switch event.
7. the pretection switch system hand in hand in EPON connecting system as claimed in claim 6, it is characterized in that: described OLT is provided with main control card and EPON line card, protection group is created between any PON mouth of any slot line card hand in hand,
Two ends OLT in protection group is by direct-connected or set up physical connection through exchange.
8. the pretection switch system hand in hand in EPON connecting system as claimed in claim 6, is characterized in that: the OLT in described system comprises: Configuration Manager, data simultaneous module, switching control module and state-maintenance module, 4 functional modules totally,
Configuration Manager preserve webmaster assign configuration data, realize the synchronous logic of configuration data between protection group OLT and complete issuing the configuration data of ONU,
Data simultaneous module is provided in interface and the passage of synchrodata between protection group OLT,
Switching control module detection failure also completes switching action,
The working condition of state-maintenance module monitors protection group also realizes the synchronous logic of status data between protection group OLT.
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