CN102917286A - 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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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 PON protection in the Ethernet passive optical network is switched) switched in the hand in hand protection that the present invention relates in the EPON connecting system (referred to as the EPON system), is specifically to protect hand in hand reverse method and system in a kind of EPON connecting system.
Background technology
Ethernet passive optical network (Ethernet Passive Optical Network, EPON) has been integrated 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 transmission, the simultaneously multiple business such as supported data, voice and video.Therefore, it combines the advantage of PON technology and ethernet technology: high, compatible strong, the convenient management of low cost, high bandwidth, autgmentability, service bearer mode are flexible.
Typical EPON system (EPON connecting system) is comprised of optical line terminal (OLT), optical network unit (ONU) and optical distribution (ODN).OLT(Optical Line Terminal) the centre machine room provides the optical fiber interface towards passive optical-fiber network.ONU(OpticalNetwork Unit) is ustomer premises access equipment, mainly adopts Ethernet protocol, the business such as broadband voice, data or video are provided for the user.ODN(Optical Distributed Network) mainly connect OLT and ONU by one or several optical branching devices (Splitter also is called optical splitter), its function is the distribution downlink data and concentrates upstream data.ODN adopts passive device, can place round-the-clock environment.
Along with a large amount of deployment of EPON system, increasing crucial the application carried by EPON, and operator has proposed very high requirement to the reliability of EPON system.The factor that affects 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.
Be reply the problems referred to above, the trunk optical fiber that operator not only needs to dispose in the single OLT is switched and fully protective switching, more needs to support the dual-homing networking mode of ONU between many OLT, namely protects hand in hand switchover mode.
Existing hand in hand networking mode need guarantee that in the OLT side dual-homed ONU has same configuration data at two OLT as shown in Figure 1.Under normal circumstances, Business Stream is by a side PON MAC(PON media interviews controlled entity) between ONU and OLT, transmit, when light path or equipment failure occured, the ONU auto switching continued bearer service to opposite side PON MAC.This hand in hand protection is switched needs the ONU that uses two PON MAC to be equipped with two optical module types to carry out networking, two PON MAC of ONU respectively registration on two OLT, Hot Spare each other.The shortcoming of this scheme is: the ONU structure of two PON MAC is comparatively complicated, and power consumption and cost are higher; Usually need the configuration data of artificial two PON MAC of assurance identical, the workload that equipment is opened and safeguarded is larger.
Summary of the invention
For the defective that exists in the prior art; the object of the present invention is to provide and protect hand in hand reverse method and system in a kind of EPON connecting system; by substitute two PON MAC type ONU with relative low price and the less single PON MAC type ONU of power consumption; the PON that realizes handing in hand cheaply protects switchover mode; reduce hand in hand lower deployment cost and the whole network power consumption of EPON network; the simplified network configuration; product competitiveness that can not only lifting means manufacturer also meets the requirement of the environmental protection network that Virtual network operator proposes.
For reaching above purpose, the technical scheme that the present invention takes is:
Protect hand in hand reverse method in a kind of 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 types in user's side; create hand in hand protection group in the two ends optical line terminal OLT; and incorporate two PON ports on the OLT of two ends into one and realize the 1+1 full guard in the protection group hand in hand
After hand in hand protection group creates successfully, the user issues ONU by network management system NMS configuration data any end OLT in the protection group,
Two PON ports of optical network unit ONU are connected respectively to the corresponding PON port of two ends OLT,
During normal operation, ONU selects one of them PON port bearer service, sets up hand in hand management connection between the OLT of two ends, and the ONU configuration data between two PON ports on the ONU and status data pass through hand in hand administrative message real-time synchronization,
When fault occurs, finish fault detect by ONU, work on to opposite side PON port from the PON port switching of work at present, ONU does not go registration in the process of switching, and the business that it carries can immediate recovery, switch finish after, ONU reports the event of switching to OLT.
On the basis of technique scheme, described hand in hand protection group identifies with " managing I P, ply-yarn drill slot number, PON slogan " tlv triple, has the unique protection group number of the overall situation.
On the basis of technique scheme, after the configuration data of ONU is issued to OLT equipment, preserve to the two ends OLT in the protection group is upper by managing hand in hand Connection-copy, be consistent to guarantee the configuration of identical ONU on the OLT of two ends.
On the basis of technique scheme, described configuration data comprises at least: the mandate of ONU, band width configuration, port vlan.
On the basis of technique scheme, by the operating state of all ONU links of management connection monitoring at two ends, finish ONU configuration and recovering state by the OLT cooperation that two ends are protected mutually between the OLT.
On the basis of technique scheme, the concrete steps that protection is switched are as follows:
Two ends OLT among A, the protection group sets up physical connection by direct-connected or process exchange; OLT sets up management by configuration management IP and connects between the two ends OLT among the protection group, be used for carrying hand in hand administrative message;
B, on the OLT of two ends configuration protection group hand in hand successively successively, carry out 1+1 protection take the PON mouth as granularity; During configuration, joined OLT and connected by management first, detected the configuration status of opposite end; If the opposite end not yet disposes, wait for that then the other side is configured; If the opposite end has been waiting state, then connect the range finding of holding consultation by managing hand in hand, determine the distance measurement value RTT of ONU under the OLT PON mouth of two ends;
The PON mouth of protecting mutually among C, the two ends OLT is operating conditions, the logical links of registering at arbitrary PON mouth, ply-yarn drill all is synchronized to opposite end PON mouth by the management connection, and as the registration of virtual logical link, but the RTT value is then used the distance measurement value of this logical links that arrives at opposite end PON mouth learning; OLT is every LLID LLID that link assignment is different, also connects by management to be synchronized to the opposite end, makes the same link identical at the LLID that two ends OLT distributes; The ONU of actual registered is in operating conditions active on the PON mouth, and the ONU of virtual registration is in attitude standby for subsequent use; Ply-yarn drill is that every logical links all creates the static link data, and the ONU to operating conditions issues " state keeps holdover " order simultaneously, and ONU can not fall registration when switching generation with assurance, professional soon quick-recovery;
ONU link information on D, the two ends OLT has been finished synchronously, so both sides OLT all can find identical ONU set; The ONU that OLT issues webmaster authorizes and business configuration writes the ply-yarn drill buffer memory, and is synchronized to opposite end OLT, and this identical ONU that has guaranteed both sides OLT has identical business configuration, and this is configuring redundancy;
E, ply-yarn drill upgrade local configuration data structure after receiving the ONU configuration, and issuing by configuration task of actual disposition data processed; For the ONU of operating conditions, directly issue configuration to ONU, and dispose synchronously flag bit to PON mouth for subsequent use; For the ONU of attitude for subsequent use, do not issue actual disposition;
F, when generation fault or light path are deteriorated, trigger ONU PON mouth and switch, the static link state on the OLT changes; After ply-yarn drill detects the Link State change, upgrade the local data state and report the event of switching to webmaster;
G, two ends OLT ply-yarn drill connect alarm and other the various dynamic datas of synchronous ONU by management;
H, ply-yarn drill regularly detect the Link State under the protection group PON mouth, connect the Link State and the local state that obtain under the PON mouth of opposite end by management simultaneously and compare; If the state at two ends is attitude for subsequent use, then should be that ONU falls registration, ply-yarn drill is all deleted the static link configuration of this ONU under the PON mouth of both sides, report the ONU alarm that goes offline to webmaster simultaneously;
After I, ply-yarn drill are restarted, at first receive protection group configuration and ONU mandate that main control card issues, connect by management subsequently, send " synchronization request Sync Request " to opposite end OLT ply-yarn drill; The ply-yarn drill of receiving synchronization request then connects to synchronous all the ONU links of requestor, alarm, configuration flag bit and other dynamic datas by management;
When J, protection group deletion, ply-yarn drill is deleted static link configurations all under the protection group PON mouth, simultaneously PON mouth recovering state is arrived the unprotect state.
Protect hand in hand exchanging system in a kind of EPON connecting system that adopts said method, it is characterized in that comprise: optical line terminal OLT and single PON MAC are equipped with the optical network unit ONU of two optical module types,
Link to each other by the 1:N optical branching device between OLT and the ONU, form full optical protection switching topological structure, N is the positive integer greater than 2,
Two optical modules of described optical network unit ONU link to each other by the 1:N optical branching device PON mouth corresponding with OLT respectively,
When normal operation, ONU selects an OLT PON mouth to register by the normal optical module of light path, and another optical module is then closed luminous TX, is in the cold standby state,
When the light path that works broke down or be deteriorated, the ONU auto switching continued bearer service to another optical module, the variation that OLT perception ONU Link State occurs, and produce the relevant event of switching.
On the basis of technique scheme, described OLT is provided with main control card and EPON ply-yarn drill, and protection group is created between any PON mouth of any groove bit line card hand in hand,
Two ends OLT in the protection group sets up physical connection by direct-connected or process exchange.
On the basis of technique scheme, the OLT in the described system comprises: Configuration Manager, data simultaneous module, switching control module and state-maintenance module, and totally 4 functional modules,
Configuration Manager preserves configuration data that webmaster assigns, realize that the logic that configuration data between protection group OLT is synchronous and the configuration data of finishing ONU issue,
Data simultaneous module is provided at interface and the passage of synchrodata between protection group OLT,
Switching control module detection failure is also finished switching action,
The working condition of state-maintenance module monitors protection group also realizes the synchronous logic of status data between protection group OLT.
Protect hand in hand reverse method and system in the EPON connecting system of the present invention; by substitute two PON MAC type ONU with relative low price and the less single PON MAC type ONU of power consumption; the PON that realizes handing in hand cheaply protects switchover mode; reduce hand in hand lower deployment cost and the whole network power consumption of EPON network; the simplified network configuration; product competitiveness that can not only lifting means manufacturer also meets the requirement of the environmental protection network that Virtual network operator proposes.
Protect hand in hand reverse method and system in the EPON connecting system of the present invention; adopt the ONU of single PON MAC type to replace the ONU of two PON MAC types; synchronous and the state-maintenance function of configuration management, switching control, data that is aided with OLT; both realized that reliable and stable hand in hand protection switched, also greatly reduced power consumption and cost.The EPON reliability of service can not only be improved, the networking cost of operator can also be greatly reduced.
Description of drawings
The present invention has following accompanying drawing:
Fig. 1 be existing EPON system hand in hand protection switch networking diagram;
Fig. 2 be EPON system of the present invention (EPON connecting system) hand in hand protection switch networking diagram;
Fig. 3 is that the configuration flow schematic diagram is switched in hand in hand protection of the present invention;
Fig. 4 is hand in hand protection group link of the present invention registration, removes the synchronous flow chart of log-on message; Wherein, Fig. 4. (a) be link registration, Fig. 4. (b) go registration for link;
Fig. 5 be among the present invention hand in hand under the protection group configuration data of ONU issue schematic flow sheet;
Fig. 6 is the interior Link State maintenance process schematic diagram of protection group among the present invention;
Fig. 7 is that EPON system of the present invention (EPON connecting system) protects hand in hand the system of switching to form schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Shown in Fig. 2,3; protect hand in hand reverse method in the EPON connecting system of the present invention; adopt single PON MAC to be equipped with the optical network unit ONU of two optical module types in user's side; create hand in hand protection group (implication at " two ends " refers to that the user passes through the two ends OLT of the mutual protection of network management system NMS configuration) herein in the two ends optical line terminal OLT; and incorporate two PON ports on the OLT of two ends into one and realize the 1+1 full guard in the protection group hand in hand
After hand in hand protection group creates successfully, the user issues ONU by network management system NMS configuration data any end OLT in the protection group,
Two PON ports of optical network unit ONU are connected respectively to the corresponding PON port of two ends OLT,
During normal operation, ONU selects one of them PON port bearer service, sets up hand in hand management connection between the OLT of two ends, and the ONU configuration data between two PON ports on the ONU and status data pass through hand in hand administrative message real-time synchronization,
When fault occurs, finish fault detect by ONU, work on to opposite side PON port from the PON port switching of work at present, ONU does not go registration in the process of switching, and the business that it carries can immediate recovery, switch finish after, ONU reports the event of switching to OLT.
The method of the invention realizes other 1+1 fully protective switching function of PON mouth level between the OLT machine frame of two ends by hand in hand protection group is set in two ends EPON optical line terminal OLT; Connect by the management that increases between the machine frame at OLT, finish automatically copying of ONU configuration data; The link of the upper registration of two ends OLT and state information are by the administrative message real-time synchronization of handing in hand.
On the basis of technique scheme, described hand in hand protection group identifies with " managing I P, ply-yarn drill slot number, PON slogan " tlv triple, has the unique protection group number of the overall situation.
On the basis of technique scheme, after the configuration data of ONU is issued to OLT equipment, preserve to the two ends OLT in the protection group is upper by managing hand in hand Connection-copy, be consistent to guarantee the configuration of identical ONU on the OLT of two ends.
On the basis of technique scheme, described configuration data comprises at least: the mandate of ONU, band width configuration, port vlan.
On the basis of technique scheme, by the operating state of all ONU links of management connection monitoring at two ends, finish ONU configuration and recovering state by the OLT cooperation that two ends are protected mutually between the OLT.
On the basis of technique scheme, the concrete steps that protection is switched are as follows:
Two ends OLT among A, the protection group sets up physical connection by direct-connected or process exchange; OLT sets up management by configuration management IP and connects between the two ends OLT among the protection group, be used for carrying hand in hand administrative message;
Preferably, the management of handing in hand between the described OLT is connected to the TCP mode and connects, and when protection group created, data simultaneous module foundation was connected with the opposite end, and safeguards its validity; During the protection group deletion, delete simultaneously this connection; Same OLT with can with many OLT between set up simultaneously management and be connected;
B, on the OLT of two ends configuration protection group hand in hand successively successively, carry out 1+1 protection take the PON mouth as granularity; During configuration, joined OLT and connected by management first, detected the configuration status of opposite end; If the opposite end not yet disposes, wait for that then the other side is configured; If the opposite end has been waiting state, then connect the range finding of holding consultation by managing hand in hand, determine the distance measurement value RTT(Round Trip Time of ONU under the OLT PON mouth of two ends);
The PON mouth of protecting mutually among C, the two ends OLT is operating conditions, the logical links of registering at arbitrary PON mouth, ply-yarn drill all is synchronized to opposite end PON mouth by the management connection, and as the registration of virtual logical link, but the RTT value is then used the distance measurement value of this logical links that arrives at opposite end PON mouth learning; OLT is every LLID LLID that link assignment is different, also connects by management to be synchronized to the opposite end, makes the same link identical at the LLID that two ends OLT distributes; The ONU of actual registered is in operating conditions active on the PON mouth, and the ONU of virtual registration is in attitude standby for subsequent use; Ply-yarn drill is that every logical links (no matter being physical link or virtual link) all creates the static link data, and the ONU to operating conditions issues " state keeps holdover " order simultaneously, and ONU can not fall registration when switching generation with assurance, professional soon quick-recovery;
ONU link information on D, the two ends OLT has been finished synchronously, so both sides OLT all can find identical ONU set; The ONU that OLT issues webmaster authorizes and business configuration writes the ply-yarn drill buffer memory, and is synchronized to opposite end OLT, and this identical ONU that has guaranteed both sides OLT has identical business configuration, and this is configuring redundancy;
E, ply-yarn drill upgrade local configuration data structure after receiving the ONU configuration, and issuing by configuration task of actual disposition data processed; For the ONU of operating conditions, directly issue configuration to ONU, and dispose synchronously flag bit to PON mouth for subsequent use; For the ONU of attitude for subsequent use, do not issue actual disposition;
F, when generation fault or light path are deteriorated, trigger ONU PON mouth and switch, the static link state on the OLT changes; After ply-yarn drill detects the Link State change, upgrade the local data state and report the event of switching to webmaster;
G, two ends OLT ply-yarn drill connect alarm and other the various dynamic datas of synchronous ONU by management; Described dynamic data comprises at least: the MAC Address that Link State, LLID information, distance measurement value, study are arrived;
H, ply-yarn drill regularly detect the Link State under the protection group PON mouth, connect the Link State and the local state that obtain under the PON mouth of opposite end by management simultaneously and compare; If the state at two ends is attitude for subsequent use, then should be that ONU falls registration, ply-yarn drill is all deleted the static link configuration of this ONU under the PON mouth of both sides, report the ONU alarm that goes offline to webmaster simultaneously;
After I, ply-yarn drill are restarted, at first receive protection group configuration and ONU mandate that main control card issues, connect by management subsequently, send " synchronization request Sync Request " to opposite end OLT ply-yarn drill; The ply-yarn drill of receiving synchronization request then connects to synchronous all the ONU links of requestor, alarm, configuration flag bit and other dynamic datas by management;
When J, protection group deletion, ply-yarn drill is deleted static link configurations all under the protection group PON mouth, simultaneously PON mouth recovering state is arrived the unprotect state.
Wherein said steps A, management connect by master control borad to be responsible for setting up and safeguarding, is used for receiving and dispatching synchrodata between the OLT ply-yarn drill of two ends.The data encapsulation that ply-yarn drill will need to send sends to master control borad in the communication between plates message, connect by management to be forwarded to opposite end OLT, gives terminal wiring card by the communication between plates protocol forward more subsequently.
Wherein said step B, hand in hand protection group respectively configuration on two OLT entities of webmaster is with the physical address of (managing I P, slot number, PON slogan) tlv triple as mutual protection.During configuration, the legitimacy of reply tlv triple is carried out verification.
Wherein said step C, the PON mouth of two ends OLT adopts different LLID allocation strategies in protection group, when registering simultaneously on the OLT of two ends with the assurance multilink, does not produce the LLID distribution conflict.
Wherein for step e, in system's running, the ONU configuration task cycle carries out repeatedly, and the operating state of each execution cycle according to configuration flag bit and ONU determines whether issuing configuration.
Wherein for step G, dynamic data refers to the various flag bits or the data table items that dynamically generate in system's running, the MAC Address that arrives such as alarm, event, study, multicast member list item etc.The state in the protection group that makes of these data of dynamic synchronization is consistent, and is conducive to professional fast quick-recovery.
Wherein for step H, Link State detect be two ends OLT ply-yarn drill simultaneously, repeatedly carry out, but have each other negotiation mechanism, when a side line card was processed, the opposite side ply-yarn drill was then skipped this processing.
The present invention gives the system that the hand in hand protection in a kind of EPON connecting system is switched, and 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 types,
Link to each other by the 1:N optical branching device between OLT and the ONU, form full optical protection switching topological structure, N is the positive integer greater than 2,
Two optical modules of described optical network unit ONU link to each other by the 1:N optical branching device PON mouth corresponding with OLT respectively,
When normal operation; ONU selects an OLT PON mouth to register by the normal optical module of light path; another optical module is then closed luminous TX; be in the cold standby state; ONU is according to the logic of switching of himself; select the light path that can work to register at the PON of two OLT mouth; the state information of ONU keeps synchronously at these two OLT PON mouths; namely when ONU one of them PON mouth in protection group is registered or is gone to register; its registration or go the log-on message can automatic synchronization on another PON mouth in the protection group; so can find identical ONU set on the PON mouth of two ends OLT
When the light path that works broke down or be deteriorated, the ONU auto switching continued bearer service to another optical module, the variation that OLT perception ONU Link State occurs, and produce the relevant event of switching.
System of the present invention comprises two OLT, many ONU and a plurality of 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), between OLT and the ONU with the 1:N optical branching device (X is connected with Y to connect and is helped light path protection topological structure, between the OLT of two ends by direct-connected or set up physical connection (m) through exchange.Be different from traditional hand in hand PON protection and switch design; the present invention uses the ONU of single PON MAC, two optical modules; the configuration management, data that cooperates OLT synchronously, switching control and state-maintenance module set up hand in hand protection and switch network; two OLT respectively go out 1 end PON mouth and form a 1+1 protection group; two PON ports of every ONU link to each other with the fibre of joining of two optical splitters; two optical splitters link to each other with two OLT PON mouths in the protection group respectively, form full optical protection switching topology.
System of the present invention connects by the hand in hand management of setting up between the OLT machine frame, realizes ONU configuration and status data automatic synchronization mechanism, makes OLT can cooperate the ONU of single PON MAC, two optical modules to set up hand in hand network.
On the basis of technique scheme, described OLT is provided with main control card and EPON ply-yarn drill, and protection group is created between any PON mouth of any groove bit line card hand in hand,
Two ends OLT in the protection group sets up physical connection by direct-connected or process exchange.
Preferably, described protection group can be based upon between any PON mouth of any groove bit line card among two OLT, and same OLT can carry out the protection group configuration with many other OLT simultaneously.
On the basis of technique scheme, the OLT in the described system comprises: Configuration Manager, data simultaneous module, switching control module and state-maintenance module, and totally 4 functional modules,
Configuration Manager preserves configuration data that webmaster assigns, realize that the logic that configuration data between protection group OLT is synchronous and the configuration data of finishing ONU issue,
Data simultaneous module is provided at interface and the passage of synchrodata between protection group OLT,
Switching control module detection failure is also finished switching action,
The working condition of state-maintenance module monitors protection group also realizes the synchronous logic of status data between protection group OLT.
For example: Configuration Manager, preserve protection group configuration and the ONU configuration that webmaster issues and also between protection group, copy, with the ONU configuration distributing to far-end ONU equipment; The switching control module, when detecting when unusual, the ONU auto switching is to light path for subsequent use, and the event of switching that OLT detects ONU also arranges the correlating markings position; Data simultaneous module safeguards that the management between the OLT of two ends connects and synchronous various dynamic datas between protection group; The state-maintenance module is safeguarded the protection group state, monitors the working condition of all ONU links on the PON mouth of two ends, carries out in case of necessity recovering state.
Preferably, described Configuration Manager can dispose according to protection group, with the opposite end PON mouth of the ONU configuration replication under any PON mouth in any ply-yarn drill among the OLT to protection group.
Preferably, described switching control module is supported auto switching and Forced Switch.Described Forced Switch is switched order for issuing by webmaster, notice ONU switch operating light path.The situation that the switching control module is switched according to ONU, the operating state of renewal OLT link.
Preferably, described data simultaneous module is the task that the cycle carries out in the system, and the various dynamic datas that produce during to operation carry out regularly synchronously.
Preferably, described state-maintenance module is the task that the cycle carries out in the system, and the operating state of ONU in the protection group is regularly monitored and preserves.(as recovering after the disconnected fibre of ONU, power down or the ply-yarn drill power down) can automatically restore to the front state of unusual generation when from abnormal restoring.
Referring to Fig. 2, the present invention proposes a kind of EPON connecting system and protect hand in hand the networking mode of switching.Protection group is set up between two optical line terminals (OLT) hand in hand, and two PON mouths of protection can be any PON ports of the upper any EPON ply-yarn drill of two OLT mutually, are connected respectively to 1:N optical splitter X and Y by optical fiber # 1 and optical fiber #2.Optical network unit in the system (ONU) is two optical modules, single PON MAC type ONU.The optical module A of ONU1～ONUn connects respectively tail optical fiber X1 ~ Xn of optical splitter X, and the optical module B of ONU1～ONUn connects respectively tail optical fiber Y1 ~ Yn of optical splitter Y.OLT A and OLT B converge to first line of a couplet switch by first line of a couplet circuit a and b with business datum.Link to each other by management channels m between OLT A and the OLT B, this passage be responsible for carrying hand in hand management connect, be used for synchrodata between two OLT.
Referring to Fig. 3, show the protection group configuration flow of switching hand in hand of the present invention, comprising:
301: the hand in hand protection group parameter that receives network management configuration.Protection group identifies with " managing I P, ply-yarn drill slot number, PON slogan " tlv triple, has the unique protection group number of the overall situation.Setting up hand in hand by managing I P between the OLT, management connects;
302: hand in hand protection group respectively configuration on the OLT of two ends.When certain end OLT begins to dispose, connect by management first, inquiry opposite end configuring condition if the opposite end has received and disposed hand in hand and be in waiting state, then can continue configuration flow, otherwise be self to enter waiting state 306;
303: connect by management, consult to carry out ONU distance measurement value (RTT) study with the opposite end.The RTT value record that ply-yarn drill will be learnt is in the link information table;
304: the corresponding PON mouth of local terminal OLT is opened, and the local terminal state is set is operating conditions;
305: webmaster is handed down to the ONU object of ONU configuration synchronization under the PON mouth of opposite end under the local terminal PON mouth.
Preferably, above-mentioned 303 described range finding learning processes are, all ONU are registered under the OLT PON mouth of two ends, determine the distance measurement value of ONU under the OLT of two ends according to log-on message.
Said method provided by the invention connects by the management of setting up between OLT, and coordination two ends OLT finds range respectively and enters operating state, and the ONU that simultaneously webmaster is issued is configured in and carries out automatic synchronization between the OLT of two ends, effectively reduces the complexity of human configuration.
Referring to Fig. 4, the synchronous flow process of show hand in hand protection group link registration, removing log-on message:
Wherein figure (a) shows link and registers synchronous flow process, comprising:
401: receive link registration from the PON chip;
402: judge that by flag bit this message is spontaneous registration message on the local terminal PON mouth, or the opposite end registration message of coming synchronously;
403: if this message is spontaneous registration message on the local terminal PON mouth, the synchronous mark position then is set and with this message synchronization to the opposite end;
404: according to this registration message, upgrade the link information table of local terminal.The data of preserving in the link information table comprise link MAC, LLID value and RTT value;
405: in the PON chip, write static link, so that OLT keeps link configuration, in link generation reversed process, it is not gone registration;
406: come synchronously if the link registration of receiving is the opposite end, then the RTT value with this link changes this link in the RTT value that we learn, and writes static link again and upgrades the link information table.
Wherein figure (b) shows link and goes to register synchronous flow process, comprising:
407: receive link from the PON chip and remove registration message;
408: judge that by flag bit this message is the spontaneous registration message that goes on the local terminal PON mouth, or the opposite end come synchronously remove registration message;
409: if this message is the spontaneous registration message that goes on the local terminal PON mouth, then synchronously this message to opposite end OLT;
410: this link entry of deletion from the link information table of local terminal;
411: its static link configuration of deletion from local terminal PON chip is treated to registration with ONU.
Said method provided by the invention makes the log-on message of the ONU synchronously configuration on the OLT of two ends of single PON MAC type, and when switching when occuring, Link State changes, but ONU can not fall registration, and business is fast quick-recovery also.
Referring to Fig. 5, the business configuration that shows ONU under the protection group of handing in hand issues flow process, comprising:
501: the operating state of judging ONU is in " operating conditions " or " attitude for subsequent use ".If be in " attitude for subsequent use ", then finish this configuration flow;
502: if be in operating conditions, judge further then whether the flag bit of this business configuration is " disposing ".If be " disposing ", then finish this configuration flow;
503: if this business configuration flag bit is " not configuration ", then issuing service disposes to ONU.If the configuration distributing failure then finishes this configuration flow;
504: if the configuration distributing success then arranges flag bit and is " disposing ";
505: will dispose flag bit and be synchronized to ONU object under the PON mouth of opposite end.
501～505 collocation methods that provide are a single configuration flow, and in implementation process, this flow process is carried out repeatedly by independent task control.Control ONU configuration distributing action in the protection group according to the operating state of ONU and relevant configuration flag bit, can guarantee that being configured in of same ONU can not repeat on the OLT of two ends to issue.
Referring to Fig. 6, show the hand in hand flow process of the interior Link State maintenance of protection group, comprising:
601: the operating state of obtaining all links under the OLT of opposite end by management channels;
602: the operating state of obtaining respective links under the local terminal OLT;
603: for a certain link, compare its two state values under the OLT of two ends;
604: if two state values are that a master one is standby, think that then link is working properly, jump out processing;
605,606: if two state values are identical, and be all attitude for subsequent use, then link has been in login state, deletes the static link configuration of this ONU, and ONU is done the processing that goes offline;
607: if two state values are all primary attitude, then belong to abnormality, enter abnormality processing.
The present invention also has independent task control, and above-mentioned flow process is carried out repeatedly, realizes the dynamic diagnosis to all Link States in the protection group.
Referring to Fig. 7, show the system schematic that hand in hand protection is switched.Described system comprises that optical line terminal OLT A and OLT B, two optical module are 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 the switching control module, and described NMS can manage many OLT systems simultaneously.OLT side, data simultaneous module safeguard that the management between the OLT of two ends connects.NMS is the Configuration Manager of all ONU configuration distributings to OLT, and this module is preserved configuration data and is configured to synchronously opposite end OLT in the protection group by data simultaneous module.The switching control module is responsible for detecting the operating state of all ONU links, is updated to the state-maintenance module.The state-maintenance module is preserved and is comprised the ONU Link State at interior various dynamic datas, is synchronized to the opposite end by data simultaneous module.The ONU side, to detect optical link deteriorated or when receiving the Forced Switch order as ONU, switches primary, spare light path by the switching control module, uses identical PON MAC to be switched to other end OLT in the situation of not falling registration and work.The hand in hand exchanging system that the present invention proposes has been introduced management connection and the sync cap between the OLT; overcome the existing shortcoming of protecting hand in hand separate configurations between the OLT, must coming with two PON MAC bearer service, reduced the business configuration workload, provided cost savings, reduced equipment power dissipation.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
The content that is not described in detail in this specification belongs to the known prior art of this area professional and technical personnel.
Claims (9)
1. protect hand in hand reverse method in the 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 types in user's side; create hand in hand protection group in the two ends optical line terminal OLT; and incorporate two PON ports on the OLT of two ends into one and realize the 1+1 full guard in the protection group hand in hand
After hand in hand protection group creates successfully, the user issues ONU by network management system NMS configuration data any end OLT in the protection group,
Two PON ports of optical network unit ONU are connected respectively to the corresponding PON port of two ends OLT,
During normal operation, ONU selects one of them PON port bearer service, sets up hand in hand management connection between the OLT of two ends, and the ONU configuration data between two PON ports on the ONU and status data pass through hand in hand administrative message real-time synchronization,
When fault occurs, finish fault detect by ONU, work on to opposite side PON port from the PON port switching of work at present, ONU does not go registration in the process of switching, and the business that it carries can immediate recovery, switch finish after, ONU reports the event of switching to OLT.
2. protect hand in hand reverse method in the EPON connecting system as claimed in claim 1, it is characterized in that: described hand in hand protection group identifies with " managing I P, ply-yarn drill slot number, PON slogan " tlv triple, has the unique protection group number of the overall situation.
3. protect hand in hand reverse method in the EPON connecting system as claimed in claim 1; it is characterized in that: after the configuration data of ONU is issued to OLT equipment; preserve to the two ends OLT in the protection group is upper by managing hand in hand Connection-copy, be consistent to guarantee the configuration of identical ONU on the OLT of two ends.
4. protect hand in hand reverse method in the EPON connecting system as claimed in claim 1, it is characterized in that: described configuration data comprises at least: the mandate of ONU, band width configuration, port vlan.
5. protect hand in hand reverse method in the EPON connecting system as claimed in claim 1; it is characterized in that: by the operating state of all ONU links of management connection monitoring at two ends, finish ONU configuration and recovering state by the OLT cooperation that two ends are protected mutually between the OLT.
6. protect hand in hand reverse method in the EPON connecting system as claimed in claim 1, it is characterized in that the concrete steps that protection is switched are as follows:
Two ends OLT among A, the protection group sets up physical connection by direct-connected or process exchange; OLT sets up management by configuration management IP and connects between the two ends OLT among the protection group, be used for carrying hand in hand administrative message;
B, on the OLT of two ends configuration protection group hand in hand successively successively, carry out 1+1 protection take the PON mouth as granularity; During configuration, joined OLT and connected by management first, detected the configuration status of opposite end; If the opposite end not yet disposes, wait for that then the other side is configured; If the opposite end has been waiting state, then connect the range finding of holding consultation by managing hand in hand, determine the distance measurement value RTT of ONU under the OLT PON mouth of two ends;
The PON mouth of protecting mutually among C, the two ends OLT is operating conditions, the logical links of registering at arbitrary PON mouth, ply-yarn drill all is synchronized to opposite end PON mouth by the management connection, and as the registration of virtual logical link, but the RTT value is then used the distance measurement value of this logical links that arrives at opposite end PON mouth learning; OLT is every LLID LLID that link assignment is different, also connects by management to be synchronized to the opposite end, makes the same link identical at the LLID that two ends OLT distributes; The ONU of actual registered is in operating conditions active on the PON mouth, and the ONU of virtual registration is in attitude standby for subsequent use; Ply-yarn drill is that every logical links all creates the static link data, and the ONU to operating conditions issues " state keeps holdover " order simultaneously, and ONU can not fall registration when switching generation with assurance, professional soon quick-recovery;
ONU link information on D, the two ends OLT has been finished synchronously, so both sides OLT all can find identical ONU set; The ONU that OLT issues webmaster authorizes and business configuration writes the ply-yarn drill buffer memory, and is synchronized to opposite end OLT, and this identical ONU that has guaranteed both sides OLT has identical business configuration, and this is configuring redundancy;
E, ply-yarn drill upgrade local configuration data structure after receiving the ONU configuration, and issuing by configuration task of actual disposition data processed; For the ONU of operating conditions, directly issue configuration to ONU, and dispose synchronously flag bit to PON mouth for subsequent use; For the ONU of attitude for subsequent use, do not issue actual disposition;
F, when generation fault or light path are deteriorated, trigger ONU PON mouth and switch, the static link state on the OLT changes; After ply-yarn drill detects the Link State change, upgrade the local data state and report the event of switching to webmaster;
G, two ends OLT ply-yarn drill connect alarm and other the various dynamic datas of synchronous ONU by management;
H, ply-yarn drill regularly detect the Link State under the protection group PON mouth, connect the Link State and the local state that obtain under the PON mouth of opposite end by management simultaneously and compare; If the state at two ends is attitude for subsequent use, then should be that ONU falls registration, ply-yarn drill is all deleted the static link configuration of this ONU under the PON mouth of both sides, report the ONU alarm that goes offline to webmaster simultaneously;
After I, ply-yarn drill are restarted, at first receive protection group configuration and ONU mandate that main control card issues, connect by management subsequently, send " synchronization request Sync Request " to opposite end OLT ply-yarn drill; The ply-yarn drill of receiving synchronization request then connects to synchronous all the ONU links of requestor, alarm, configuration flag bit and other dynamic datas by management;
When J, protection group deletion, ply-yarn drill is deleted static link configurations all under the protection group PON mouth, simultaneously PON mouth recovering state is arrived the unprotect state.
7. protect hand in hand exchanging system in the EPON connecting system that adopts the described method of claim 1, it is characterized in that comprise: optical line terminal OLT and single PON MAC are equipped with the optical network unit ONU of two optical module types,
Link to each other by the 1:N optical branching device between OLT and the ONU, form full optical protection switching topological structure, N is the positive integer greater than 2,
Two optical modules of described optical network unit ONU link to each other by the 1:N optical branching device PON mouth corresponding with OLT respectively,
When normal operation, ONU selects an OLT PON mouth to register by the normal optical module of light path, and another optical module is then closed luminous TX, is in the cold standby state,
When the light path that works broke down or be deteriorated, the ONU auto switching continued bearer service to another optical module, the variation that OLT perception ONU Link State occurs, and produce the relevant event of switching.
8. protect hand in hand exchanging system in the EPON connecting system as claimed in claim 7, it is characterized in that: described OLT is provided with main control card and EPON ply-yarn drill, and protection group is created between any PON mouth of any groove bit line card hand in hand,
Two ends OLT in the protection group sets up physical connection by direct-connected or process exchange.
9. protect hand in hand exchanging system in the EPON connecting system as claimed in claim 7, it is characterized in that: the OLT in the described system comprises: Configuration Manager, data simultaneous module, switching control module and state-maintenance module, and totally 4 functional modules,
Configuration Manager preserves configuration data that webmaster assigns, realize that the logic that configuration data between protection group OLT is synchronous and the configuration data of finishing ONU issue,
Data simultaneous module is provided at interface and the passage of synchrodata between protection group OLT,
Switching control module detection failure is also finished 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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