CN104734773A - C-type optical link protection switching optimization method of GPON (Gigabit Passive Optical Network) - Google Patents
C-type optical link protection switching optimization method of GPON (Gigabit Passive Optical Network) Download PDFInfo
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Abstract
A C-type optical link protection switching optimization method of GPON (Gigabit Passive Optical Network) includes that all OLTs (Optical Line Terminals) in the C-type optical link protection switching GPON are connected onto an SDN (Software Defined Network) controller to form a C-type optical link protection switching GPON based on the SDN framework, wherein when a main optical link between the OLTs and an ONU (Optical Network Unit) is built, the SDN controller conducts optical link building optimization control to make the main optical link in the GPON to meet the load balancing requirements of the optical links, and after main optical link protection switching between the OLTs and the ONU is achieved, the SDN controller conducts optimal control on optical link protection switching in the GPON to make the main optical link in the GPON to meet the optical link load balancing requirements. According to the C-type optical link protection switching optimization method, optical link protection switching is achieved through automatic calculation of the SDN controller, so network maintenance work is simplified, reliability of the optical network is ensured, and the ONU service can be balanced onto main PON interfaces and standby PON interfaces of the OLTs.
Description
Technical field
The present invention relates to a kind of GPON(gigabit passive optical network; gigabit passive optical network) network C class optical link pretection switch optimization method; particularly relate to a kind of based on SDN(self-defending network, Self-Defending Network) GPON network C class optical link pretection switch optimization method.
Background technology
In order to improve reliability and the robustness of optical-fiber network, can at PON(EPON, Passive Optical Network) adopt optical link wrap protection in system.Optical link protection mainly contains Four types.As shown in Figure 1, be the protection of C class optical link, there is following characteristics:
1, OLT(optical line terminal, Optical Line Terminal) two PON interface, PON interface primary, for subsequent use is all in running order (Hot Spare).OLT should ensure primary PON interface business information can backed up in synchronization to PON interface for subsequent use, make in pretection switch process, PON interface for subsequent use can maintain ONU(optical network unit, Optical Network Unit) service attribute constant.
2, optical branching device: use 2 1:N optical branching devices.
3, ONU adopts PON MAC and two optical module, and optical module for subsequent use is under normal circumstances in cold standby state.Two optical modules of ONU are connected respectively to the primary and backup PON interface of OLT.
4, ONU and OLT all detects Link State, and determines whether switch according to Link State.
In order to prevent optical link from interrupting, cause ONU loss of traffic, traditional way adopts optical link wrap protection exactly.In GPON system, the trigger condition of optical link pretection switch comprises:
1, input optical signal loses (LOS);
2, input channel channel degradation:
2.1, input optical signal power is too high or too low;
2.2, the error rate is out-of-limit;
3, device hardware fault:
3.1, optical module fault;
3.2, PON MAC failure of chip (being applicable to situation about protecting between different PON MAC chip);
3.3, board faults (being applicable to the situation of PON inter-board protection);
For OLT and ONU equipment; when above-mentioned physical layer fault being detected; translation and protection time switching guard time(4 frame time should be detected continuously); as this fault exists then this optical link failure event of official confirmation always; as this fault is restored in switching guard time, then do not confirm this optical link failure event.
When OLT detects that under specific PON interface, any one is in the up optical link generation optical link pretection switch trigger event of the ONU of state of activation; OLT should stop sending downlink optical signal to this ONU immediately; and the flow of this ONU to be switched on PON interface for subsequent use (namely switching the optical link lost efficacy one by one), and by PON interface for subsequent use to ONU transmission POPUP message.ONU, after above-mentioned optical link failure event being detected, should switch the business to PON interface for subsequent use immediately, and enter POPUP state, and ONU, after receiving the POPUP message that OLT sends, restarts range finding, until enter run mode, ONU business starts to recover.
Above-mentioned traditional optical link wrap protection is when certain is extreme, and ONU business may all concentrate on the primary or PON interface for subsequent use of OLT.Original network is not based on SDN framework, but distributed AC servo system, be difficult to the change of perceived light link, once optical link changes, network manager needs Forced Switch.If keeper's Forced Switch, network manager is necessarily required to be well understood to the Link State of whole optical-fiber network.For a fairly large network, this work is obviously light not, and is very easy to make mistakes.
Summary of the invention
The invention provides a kind of GPON network C class optical link pretection switch optimization method; based on SDN framework; automatically optical link pretection switch has been calculated by SDN controller; simplify network operation work; the reliability of optical-fiber network can be ensured, again can on ONU traffic balancing to the primary PON interface and PON interface for subsequent use of OLT.
In order to achieve the above object, the invention provides a kind of GPON network C class optical link pretection switch optimization method, comprise following steps:
Set up the C class optical link pretection switch GPON network based on SDN framework, all OLT in C class optical link pretection switch GPON network are connected to SDN controller, form the C class optical link pretection switch GPON network based on SDN framework;
Set up in the process of key light link between OLT and ONU, SDN controller carries out optical link establishment optimal control, makes the key light link in GPON network meet the requirement of optical link load balancing;
There occurs optical link pretection switch between OLT and ONU after, SDN controller is optimized control to the optical link pretection switch in GPON network, makes the key light link in GPON network meet the requirement of optical link load balancing;
Described optical link load balancing requires to comprise: make the quantity M of the key light link be based upon in GPON network on the primary PON interface of OLT equal the quantity N of the key light link be based upon on the PON interface for subsequent use of OLT, or make the difference between the quantity M of the key light link be based upon on the primary PON interface of OLT and the quantity N being based upon the key light link on the PON interface for subsequent use of OLT be less than or equal to 1.
When setting up key light link between OLT and ONU, OLT is by key light link establishment information reporting to SDN controller, and described key light link establishment packets of information contains: the id setting up PON interface id and ONU of the OLT of key light link.
SDN controller carries out optical link establishment optimal control and comprises following steps:
If SDN controller have received key light link establishment information, then the key light number of links M of primary PON interface on OLT in GPON network and the key light number of links N of PON interface for subsequent use added up respectively by SDN controller, if M>N, key light link establishment then between SDN controller control OLT and ONU is on the PON interface for subsequent use of OLT, if M≤N, then the key light link establishment between SDN controller control OLT and ONU is on the primary PON interface of OLT.
There occurs optical link pretection switch between OLT and ONU after; OLT needs by optical link pretection switch information reporting to SDN controller, and described optical link pretection switch packets of information contains: the id of the id of PON interface id, ONU of the OLT before switching and PON interface id and ONU of the OLT after switching.
SDN controller is optimized control to the optical link pretection switch in GPON network and comprises following steps:
If step S3.1 SDN controller have received optical link pretection switch information, then carry out step S3.2;
Step S3.2, SDN controller calculate the optical link load in GPON network, that is, to add up in GPON network the key light number of links M of primary PON interface and the key light number of links N of PON interface for subsequent use on OLT respectively;
Whether step S3.3, SDN controller judge M's and N and are even number, if so, carry out step S3.6, if not, carry out step S3.4;
Step S3.4, SDN controller judge whether the difference between M and N is less than or equal to 1, if so, then terminate to optimize, and if not, carry out step S3.5;
Number larger in M and N is subtracted one by step S3.5, SDN controller, carries out step S3.6;
Step S3.6, SDN controller judge whether M is greater than N, if so, carry out step S3.7, if not, carry out step S3.9;
Step S3.7, except there occurs OLT that optical link switches in step S3.1, SDN controller Stochastic choice OLT, carries out force handoff to the key light link on its primary PON interface, will be switched on PON interface for subsequent use, and carry out step S3.8;
Step S3.8, SDN controller judge whether M is greater than N, if so, carry out step S3.7, if not, then terminate to optimize;
Step S3.9, SDN controller judge whether M equals N, if so, then terminate to optimize, and if not, carry out step S3.10;
Step S3.10, except there occurs OLT that optical link switches in step S3.1, SDN controller Stochastic choice OLT, carries out force handoff to the key light link on its PON interface for subsequent use, is switched on primary PON interface, carries out step S3.11;
Step S3.11, SDN controller judge whether N is greater than M, if so, carry out step S3.10, if not, then terminate to optimize.
In described step S3.2, the optical link pretection switch information that SDN controller reports according to OLT and network topological information to calculate in GPON network the key light number of links M of primary PON interface and the key light number of links N of PON interface for subsequent use on OLT.
In described step S3.7 and step S3.10, SDN controller carries out force handoff to key light link and comprises following steps:
SDN controller sends privately owned Experimenter message to selected OLT, and notice OLT carries out pressure optical link pretection switch;
Chosen OLT receives privately owned Experimenter message, obtains ONU id information, source PON interface id information and object PON interface id information;
OLT carries out OLT side and switches;
Privately owned Experimenter message is changed into privately owned OMCI message and sends to ONU by object PON interface by OLT, and notice ONU carries out ONU side and switches;
ONU carries out ONU side and switches.
Described OLT carries out OLT side and switches and comprise: OLT stops sending downlink optical signal to this ONU immediately, and by the flow of this ONU from source PON interface inverting to object PON interface, and send POPUP message by object PON interface to ONU.
Described ONU carries out ONU side and switches and comprise: ONU switches the business to object PON interface after receiving privately owned OMCI message immediately, and enters POPUP state, ONU is after receiving the POPUP message that OLT sends, restart range finding, until enter run mode, ONU business starts to recover.
Described privately owned Experimenter message format comprises:
Version;
Type;
Length;
Affairs ID;
Message value;
Type of message;
Source PON interface id information;
Object PON interface id information;
ONU id information;
Reserved field;
Wherein, message value, type of message, source PON interface id information, object PON interface id information and ONU id information are privately owned extended fields.
The present invention is based on SDN framework, automatically calculated optical link pretection switch by SDN controller, simplify network operation work, the reliability of optical-fiber network can be ensured, again can on ONU traffic balancing to the primary PON interface and PON interface for subsequent use of OLT.
Accompanying drawing explanation
Fig. 1 is the GPON schematic network structure of C class optical link protection in background technology.
Fig. 2 is the flow chart of a kind of GPON network C class optical link pretection switch optimization method provided by the invention.
Fig. 3 is the flow chart that SDN controller carries out optical link establishment optimal control.
Fig. 4 is that SDN controller is optimized the flow chart of control to the optical link pretection switch in GPON network.
Fig. 5 is that SDN controller carries out the flow chart of force handoff to key light link.
Fig. 6 is the form of privately owned Experimenter message.
Embodiment
Following according to Fig. 2 ~ Fig. 6, illustrate preferred embodiment of the present invention.
As shown in Figure 2, the invention provides a kind of GPON network C class optical link pretection switch optimization method, comprise following steps:
Step S1, set up C class optical link pretection switch GPON network based on SDN framework.
All OLT in C class optical link pretection switch GPON network are connected to SDN controller, form the C class optical link pretection switch GPON network based on SDN framework.
Step S2, set up in the process of key light link between OLT and ONU, SDN controller carries out optical link establishment optimal control, make the quantity M of the key light link be based upon in GPON network on the primary PON interface of OLT equal the quantity N of the key light link be based upon on the PON interface for subsequent use of OLT, or make the difference between the quantity M of the key light link be based upon on the primary PON interface of OLT and the quantity N being based upon the key light link on the PON interface for subsequent use of OLT be less than or equal to 1.
Step S3, between OLT and ONU, there occurs optical link pretection switch after; SDN controller is optimized control to the optical link pretection switch in GPON network; make the quantity M of the key light link be based upon in GPON network on the primary PON interface of OLT equal the quantity N of the key light link be based upon on the PON interface for subsequent use of OLT, or make the difference between the quantity M of the key light link be based upon on the primary PON interface of OLT and the quantity N being based upon the key light link on the PON interface for subsequent use of OLT be less than or equal to 1.
In described step S2, when setting up key light link between OLT and ONU, OLT needs key light link establishment information reporting to SDN controller.
Described key light link establishment packets of information contains: the id setting up PON interface id and ONU of the OLT of key light link.
As shown in Figure 3, described step S2 comprises following steps:
If step S2.1 SDN controller have received key light link establishment information, then carry out step S2.2.
Step S2.2, SDN controller calculate the optical link load in GPON network, that is, to add up in GPON network the key light number of links M of primary PON interface and the key light number of links N of PON interface for subsequent use on OLT respectively.
Step S2.3, SDN controller judge the size of M and N, if M>N, then carry out step S2.4, if M≤N, then carry out step S2.5.
Key light link establishment between step S2.4, SDN controller control OLT and ONU is on the PON interface for subsequent use of OLT.
Key light link establishment between step S2.5, SDN controller control OLT and ONU is on the primary PON interface of OLT.
In described step S3, there occurs optical link pretection switch between OLT and ONU after, OLT needs optical link pretection switch information reporting to SDN controller.
Described optical link pretection switch packets of information contains: the id of the id of PON interface id, ONU of the OLT before switching and PON interface id and ONU of the OLT after switching.
Described step S3 comprises following steps:
If step S3.1 SDN controller have received optical link pretection switch information, then carry out step S3.2.
Step S3.2, SDN controller calculate the optical link load in GPON network, that is, to add up in GPON network the key light number of links M of primary PON interface and the key light number of links N of PON interface for subsequent use on OLT respectively.
Whether step S3.3, SDN controller judge M's and N and are even number, if so, carry out step S3.6, if not, carry out step S3.4.
Step S3.4, SDN controller judge whether the difference between M and N is less than or equal to 1, if so, then terminate to optimize, and if not, carry out step S3.5.
Number larger in M and N is subtracted one (then M's and N and become even number) by step S3.5, SDN controller, carries out step S3.6.
Step S3.6, SDN controller judge whether M is greater than N, if so, carry out step S3.7, if not, carry out step S3.9.
Step S3.7, except there occurs OLT that optical link switches in step S3.1, SDN controller Stochastic choice OLT, carries out force handoff to the key light link on its primary PON interface, will be switched on PON interface for subsequent use, and carry out step S3.8.
Step S3.8, SDN controller judge whether M is greater than N, if so, carry out step S3.7, if not, then terminate to optimize.
Step S3.9, SDN controller judge whether M equals N, if so, then terminate to optimize, and if not, carry out step S3.10.
Step S3.10, except there occurs OLT that optical link switches in step S3.1, SDN controller Stochastic choice OLT, carries out force handoff to the key light link on its PON interface for subsequent use, is switched on primary PON interface, carries out step S3.11.
Step S3.11, SDN controller judge whether N is greater than M, if so, carry out step S3.10, if not, then terminate to optimize.
In described step S3.2; (this network topological information comprises link syndeton and the information exchange rates of switch for the optical link pretection switch information that SDN controller reports according to OLT and network topological information; this network topological information calculates according to LLDP message and obtains) calculate optical link load; that is, the key light number of links M of primary PON interface and the key light number of links N of PON interface for subsequent use on OLT in GPON network.
As shown in Figure 5, in described step S3.7 and step S3.10, SDN controller carries out force handoff to key light link and comprises following steps:
Step S4.1, SDN controller send privately owned Experimenter message to selected OLT, and notice OLT carries out pressure optical link pretection switch.
Step S4.2, chosen OLT receive privately owned Experimenter message, obtain ONU id information, source PON interface id information and object PON interface id information.
Step S4.3, OLT carry out OLT side and switch.
OLT stops sending downlink optical signal to this ONU immediately, and by the flow of this ONU from source PON interface inverting to object PON interface, and send POPUP message by object PON interface to ONU.
Privately owned Experimenter message is changed into privately owned OMCI message by step S4.4, OLT, and sends to ONU by object PON interface, and notice ONU carries out ONU side and switches.
Step S4.5, ONU carry out ONU side and switch.
ONU switches the business to object PON interface after receiving privately owned OMCI message immediately, and enters POPUP state, and ONU, after receiving the POPUP message that OLT sends, restarts range finding, until enter run mode, ONU business starts to recover.
As shown in Figure 6, described privately owned Experimenter message format comprises:
Version (Version);
Type (Type);
Length (Length);
Affairs ID(Transaction id);
Message value (Experimenter): Experimenter value is 255(self-defining Experimenter message id) need to ONF(Open Networking Foundation, the tissue of early start SDN standardization and popularization) tissue application;
Type of message (Experimenter type): Experimenter type value is 2 be shown to be from SDN controller direction to OLT;
Source PON interface id information (source PON id): refer to that when not carrying out optical link pretection switch, key light link is the source PON id being connected to OLT;
Object PON interface id information (object PON id): refer to after carrying out optical link pretection switch, key light link is the object PON id being connected to OLT;
ONU id information (ONU id): refer to the ONU needing to carry out optical link pretection switch;
Reserved field (Reserved): temporarily need not, for later expand prepare.
Wherein, message value (Experimenter), type of message (Experimenter type), source PON interface id information (source PON id), object PON interface id information (object PON id) and ONU id information (ONU id) are privately owned extended fields, version (Version), type (Type), length (Length), affairs ID(Transaction id) and reserved field (Reserved) be original define field.
The management entity OPTICAL-LS-C of described privately owned OMCI message comprises with properties:
Management entity id, work OPTICAL-LS-C pointer, protection OPTICAL-LS-C pointer and protection act.
The management entity OPTICAL-LS-C of described privately owned OMCI message is defined as follows shown in table:
Wherein, " ME " represents management entity, and " R " represents read-only, and " pressure " represents to exist; " R; W " represent readable writing, ONT(Optical Network Terminal, Optical Network Termination) be the management object that C class optical link is protected; after ONT initialization completes; set up the example of this object respectively, one represents active side, and another represents protection side.
Present invention employs SDN framework; SDN controller can the trigger condition of perceived light link protection change whether suitable; then centralized and unified calculating; equally loaded; finally by the mode issuing Experimenter message; notice OLT and ONU carry out pressures optical link pretection switch, because optical link pretection switch has been calculated automatically by SDN controller, therefore whole network management and configure very simple and intelligent.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a GPON network C class optical link pretection switch optimization method, is characterized in that, comprise following steps:
Set up the C class optical link pretection switch GPON network based on SDN framework, all OLT in C class optical link pretection switch GPON network are connected to SDN controller, form the C class optical link pretection switch GPON network based on SDN framework;
Set up in the process of key light link between OLT and ONU, SDN controller carries out optical link establishment optimal control, makes the key light link in GPON network meet the requirement of optical link load balancing;
There occurs optical link pretection switch between OLT and ONU after, SDN controller is optimized control to the optical link pretection switch in GPON network, makes the key light link in GPON network meet the requirement of optical link load balancing;
Described optical link load balancing requires to comprise: make the quantity M of the key light link be based upon in GPON network on the primary PON interface of OLT equal the quantity N of the key light link be based upon on the PON interface for subsequent use of OLT, or make the difference between the quantity M of the key light link be based upon on the primary PON interface of OLT and the quantity N being based upon the key light link on the PON interface for subsequent use of OLT be less than or equal to 1.
2. GPON network C class optical link pretection switch optimization method as claimed in claim 1; it is characterized in that; when setting up key light link between OLT and ONU; OLT is by key light link establishment information reporting to SDN controller, and described key light link establishment packets of information contains: the id setting up PON interface id and ONU of the OLT of key light link.
3. GPON network C class optical link pretection switch optimization method as claimed in claim 2, it is characterized in that, SDN controller carries out optical link establishment optimal control and comprises following steps:
If SDN controller have received key light link establishment information, then the key light number of links M of primary PON interface on OLT in GPON network and the key light number of links N of PON interface for subsequent use added up respectively by SDN controller, if M>N, key light link establishment then between SDN controller control OLT and ONU is on the PON interface for subsequent use of OLT, if M≤N, then the key light link establishment between SDN controller control OLT and ONU is on the primary PON interface of OLT.
4. GPON network C class optical link pretection switch optimization method as claimed in claim 1; it is characterized in that; there occurs optical link pretection switch between OLT and ONU after; OLT needs by optical link pretection switch information reporting to SDN controller, and described optical link pretection switch packets of information contains: the id of the id of PON interface id, ONU of the OLT before switching and PON interface id and ONU of the OLT after switching.
5. GPON network C class optical link pretection switch optimization method as claimed in claim 4, it is characterized in that, SDN controller is optimized control to the optical link pretection switch in GPON network and comprises following steps:
If step S3.1 SDN controller have received optical link pretection switch information, then carry out step S3.2;
Step S3.2, SDN controller calculate the optical link load in GPON network, that is, to add up in GPON network the key light number of links M of primary PON interface and the key light number of links N of PON interface for subsequent use on OLT respectively;
Whether step S3.3, SDN controller judge M's and N and are even number, if so, carry out step S3.6, if not, carry out step S3.4;
Step S3.4, SDN controller judge whether the difference between M and N is less than or equal to 1, if so, then terminate to optimize, and if not, carry out step S3.5;
Number larger in M and N is subtracted one by step S3.5, SDN controller, carries out step S3.6;
Step S3.6, SDN controller judge whether M is greater than N, if so, carry out step S3.7, if not, carry out step S3.9;
Step S3.7, except there occurs OLT that optical link switches in step S3.1, SDN controller Stochastic choice OLT, carries out force handoff to the key light link on its primary PON interface, will be switched on PON interface for subsequent use, and carry out step S3.8;
Step S3.8, SDN controller judge whether M is greater than N, if so, carry out step S3.7, if not, then terminate to optimize;
Step S3.9, SDN controller judge whether M equals N, if so, then terminate to optimize, and if not, carry out step S3.10;
Step S3.10, except there occurs OLT that optical link switches in step S3.1, SDN controller Stochastic choice OLT, carries out force handoff to the key light link on its PON interface for subsequent use, is switched on primary PON interface, carries out step S3.11;
Step S3.11, SDN controller judge whether N is greater than M, if so, carry out step S3.10, if not, then terminate to optimize.
6. GPON network C class optical link pretection switch optimization method as claimed in claim 5; it is characterized in that; in described step S3.2, the optical link pretection switch information that SDN controller reports according to OLT and network topological information to calculate in GPON network the key light number of links M of primary PON interface and the key light number of links N of PON interface for subsequent use on OLT.
7. GPON network C class optical link pretection switch optimization method as claimed in claim 5, it is characterized in that, in described step S3.7 and step S3.10, SDN controller carries out force handoff to key light link and comprises following steps:
SDN controller sends privately owned Experimenter message to selected OLT, and notice OLT carries out pressure optical link pretection switch;
Chosen OLT receives privately owned Experimenter message, obtains ONU id information, source PON interface id information and object PON interface id information;
OLT carries out OLT side and switches;
Privately owned Experimenter message is changed into privately owned OMCI message and sends to ONU by object PON interface by OLT, and notice ONU carries out ONU side and switches;
ONU carries out ONU side and switches.
8. GPON network C class optical link pretection switch optimization method as claimed in claim 7; it is characterized in that; described OLT carries out OLT side and switches and comprise: OLT stops sending downlink optical signal to this ONU immediately; and by the flow of this ONU from source PON interface inverting to object PON interface, and send POPUP message by object PON interface to ONU.
9. GPON network C class optical link pretection switch optimization method as claimed in claim 7; it is characterized in that; described ONU carries out ONU side and switches and comprise: after ONU receives privately owned OMCI message; switch the business to object PON interface immediately; and entering POPUP state, ONU, after receiving the POPUP message that OLT sends, restarts range finding; until enter run mode, ONU business starts to recover.
10. GPON network C class optical link pretection switch optimization method as claimed in claim 5, it is characterized in that, described privately owned Experimenter message format comprises:
Version;
Type;
Length;
Affairs ID;
Message value;
Type of message;
Source PON interface id information;
Object PON interface id information;
ONU id information;
Reserved field;
Wherein, message value, type of message, source PON interface id information, object PON interface id information and ONU id information are privately owned extended fields.
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| CN105391644A (en) * | 2015-12-01 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | Load balancing system and method based on optical network |
| CN106921430A (en) * | 2017-02-24 | 2017-07-04 | 烽火通信科技股份有限公司 | The realization method and system of TYPE C optical link protection systems in EPON |
| WO2017190579A1 (en) * | 2016-05-05 | 2017-11-09 | 中兴通讯股份有限公司 | Method for realizing protection switching in sdn architecture and forwarding device |
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