CN102148766B - Method for service interworking in PON (passive optical network) under three-layer function networking - Google Patents
Method for service interworking in PON (passive optical network) under three-layer function networking Download PDFInfo
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Abstract
The invention relates to a PON (passive optical network) system, in particular to a method for service interworking in a PON under three-layer function networking. An OLT (optical line terminal) is directly manufactured into a three-layer device, and an ARP (address resolution protocol) proxy module is additionally installed in a master control panel of the OLT, and interworking of voice and data services in the PON is finally realized under the three-layer function networking; the three-layer function networking relates to configuring an IP (internet protocol) address to the OLT to enable the OLT of working in a network layer to realize routing protocol and then realize three-layer data forwarding and also realize the functions of a data link layer. In the method for service interworking in the PON under the three-layer function networking, as the OLT is directly manufactured into the three-layer device and the ARP proxy module is increased in the master control panel of the OLT, the interworking of voice and data services in the PON (passive optical network) is finally realized.
Description
Technical field
The present invention relates to PON system, is the method for the interior business intercommunication of PON under a kind of three layer function networkings specifically.
Background technology
In recent years, along with the fast development of the Internet, the communication technology make rapid progress, people have also presented development in pluralism to the demand of communication service.Traditional Access Network is by copper wire access, owing to being limited to the transmission attenuation of signal, causes the coverage of general end office (EO) in 3Km, and end office's quantity is a lot, and operator's cost control has been brought to challenge, cannot meet nowadays bandwidth and multiple services demand simultaneously.And the optical fiber connecting method take PON technology as major technique that nowadays we realize has realized the plurality of advantages such as two-forty, large capacity, high security, it is the mainstream technology of nowadays Access Network development.
PON (EPON) refers to and in optical distribution network, does not contain any electronic device and electronic power supply.A typical PON system is made up of three parts: optical line terminal (OLT), Optical Distribution Network (0DN) and optical network unit (ONUs).PON system adopts wavelength-division multiplex technique (wavelength-division multiplexing, WDM), realizes single fiber bi-directional transmission.Its up general employing tdma (Time Division Multiple Access, TDMA), any moment can only have an ONU to send upward signal, and different ONU distribute different timeslices, send in turn upstream data; Descending employing broadcast mode, each ONU can distribute a unique identification code after succeeding in registration, and when ONU receives data, receives only the frame or the broadcast frame that meet own identification code.PON is a point-to-multipoint optical access network, and it can provide for user the transmission of reliable voice, data and video traffic.
Telecom operators require data service between PON internal system different user to isolate mutually, so that user's maintenance and management, this has just caused the directly intercommunication of user under the ONU hanging under OLT.Traditional OLT is a two-layer equipment, so in order to realize the intercommunication of business in PON, by connect again a three-layer equipment in OLT upper united mouth, must could realize data business communicating in PON by extraneous three-layer equipment like this, not only increase the possibility of packet loss, also improve cost, made OLT not possess competitiveness simultaneously.
And OLT is in order to realize the intercommunication of voice in PON, patent " realizes the EPON system of voice intercommunication, local side apparatus and method " (application number: propose a kind of so method 200910143663.8): be to increase a VOIP (Voice over Internet Protocol in OLT the inside, by the digitlization of simulated sound signal, pattern with data packet is done real-time transmission on IP data network) dish and ARP (address resolution protocol) proxy module arranging that matches with it, this VOIP dish is used for connecting multiple IAD (integrated access equipment), described ARP proxy module is used for being communicated with source IAD and object IAD, this mode can realize the loopback of voice flow in PON really, but this is also the realization based on a two-layer equipment, also can only meet the intercommunication of speech business, and realize by software or DSP (Digital Signal Processing), can not realize surface speed forwarding for data service at a high speed.To sum up tell, this method is not suitable with the demand in epoch, can not give full play to the effect of OLT.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide the method for the interior business intercommunication of PON under a kind of three layer function networkings, by adopting the method for business intercommunication in the PON based under three layer function networkings, solve as realizing business intercommunication in PON and must connect again a three-layer equipment outward and in OLT, will additionally increase the complexity of a VOIP dish at OLT equipment.
For reaching above object, the technical scheme that the present invention takes is:
A kind of method of business intercommunication in PON under three layer function networkings, it is characterized in that: directly OLT is made to a three-layer equipment, and in the main control unit of OLT, increase ARP proxy module, and under three layer function networkings, finally realize the intercommunication of voice-and-data business in PON;
Described three layer function networkings, are OLT configuration of IP address, make it can be operated in network layer, realize Routing Protocol, and then realize three layer data forwardings, also can realize the function of data link layer.
On the basis of technique scheme, described OLT comprises: CPU element and exchange chip, store two-layer retransmitting table and three layer retransmitting tables at exchange chip,
Two-layer retransmitting table: be also referred to as mac address forwarding table, this table is made up of three elements is respectively VlanID, MAC Address and port numbers PortID;
Three layer retransmitting tables: comprise main frame routing table and network segment routing table, main frame route is that ARP table produces, and then main frame route is written to main frame routing table, forwards for exact matching, the static routing that is produced as manual configuration of network segment routing table, or be three layers of dynamic routing that Routing Protocol is learnt;
In CPU element, store exchange chip and drive, it for other programs of upper strata provide service, makes other softwares can access and control exchange chip as bottom software;
Three layer interface L3 interface modelings: the END being equivalent in Vxworks drives, it is a kind of network-driven model that is operated in data link layer, this model definition with the mutual standard interface of MUX layer, user only needs to provide on request these interfaces can realize communicating by letter of END layer and network protocol layer according to specific network interface hardware characteristic;
MUX layer: provide and its upper and lower two-layer interface of communicating by letter;
ICP/IP protocol stack: this ICP/IP protocol stack is equivalent to network layer and transport layer, realizes the function of network layer and transport layer;
ARP proxy module a: module that is application layer, realize ARP proxy function, comprise: the arp message to voice, data service under OLT is acted on behalf of forwarding capability, according to the difference of mode of operation, realize arp agency and the arp agent functionality to all ip under same vlan of standard, the arp agency of described standard refers to the arp agency of same network segment across vlan.
On the basis of technique scheme, in the time that host A is wanted to communicate by letter with host B, host A can send an ARP request message and go to find the MAC Address of host B, this ARP request message arrives the exchange chip of the main control unit of line card, the OLT of the ONU being connected with host A, the OLT being connected with this ONU successively, then arrive the CPU of the main control unit of OLT, and by the software processing moving in CPU
In CPU, this ARP request message arrived exchange chip driving before this, then arrived END and drove, and in END drives, had corresponding three layer interfaces, i.e. the information of Supervlan,
The message that drives out through END is directly delivered to ARP module and processes,
First ARP module can judge that whether object IP and source IP are at the same network segment after receiving message, as being exactly the network segment of having opened the Supervlan of ARP proxy function at the same network segment and this network segment, ARP proxy module will remove to search ARP table, sees that object MAC is whether in own ARP shows
If do not found, ARP proxy module can send ARP request message and go to learn the MAC Address of host B, this message drives and then arrives exchange chip through END driving, exchange chip successively, in exchange chip, this bag can be broadcast to each port, the ONU being connected with host B receives this ARP request broadcast packet, then be sent to host B
Host B receives after this ARP request message that MAC Address that can study OLT shows and respond the ARP back message using of the MAC Address of carrying oneself to the ARP of oneself,
ARP back message using is successively through the exchange chip of the main control unit of the line card of the ONU that is connected with host B, the OLT that is connected with this ONU, OLT, exchange chip driving, END driving, then arrive ARP proxy module,
ARP proxy module is just learnt the MAC Address of B to the ARP table of oneself after receiving this response message, refresh the main frame routing table of exchange chip simultaneously, again receiving host A when ARP proxy module sends request after the ARP request message of MAC Address of host B, the IP that it is host B that meeting proxy B goes to host A transmission source IP, source MAC is the ARP back message using of the MAC of OLT oneself, later every host A will be communicated by letter with host B, and packet directly forwards by looking into main frame routing table to exchange chip.
Under three layer function networkings of the present invention, the method for business intercommunication in PON, directly makes OLT a three-layer equipment, and in the main control unit of OLT, increases ARP proxy module, finally realizes the intercommunication of voice-and-data business in PON.
Usefulness of the present invention is:
Without external three-layer equipment and in the inner extra intercommunication that increases a VOIP and coil to realize data and speech business in PON of OLT, OLT is directly made a three-layer equipment by we, and in the main control unit of OLT, realize ARP proxy function.Make like this intercommunication of voice-and-data business in PON all can complete in OLT inside, not only reduced packet loss, also can not increase network traffics, take Internet resources, and reduce cost, more improved the competitiveness of OLT, adapt to the demand of era development.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 OLT cut-away view of the present invention,
Three layers of networking diagram of business intercommunication in Fig. 2 PON of the present invention,
The interacting message figure of Fig. 3 ARP proxy implementation procedure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Under three layer function networkings of the present invention in PON in the method for business intercommunication, directly OLT is made to a three-layer equipment, and in the main control unit of OLT, increase ARP proxy module, and under three layer function networkings, finally realize the intercommunication of voice-and-data business in PON; So-called three layer function networkings, are OLT configuration of IP address, make it can be operated in network layer, realize Routing Protocol, and then realize three layer data forwardings, also can realize the function of data link layer.
Fig. 1 is the cut-away view of we OLT, and it has demonstrated the internal structure of the main control unit of OLT required for the present invention substantially.We are briefly described various piece function wherein below:
Two-layer retransmitting table: we are also referred to as MAC (Medium/MediaAccess Control, medium access control) addresses forwarding table, this table is made up of three elements, respectively Vlan (Virtual Local Area Network, VLAN) ID, MAC Address and PortID (port numbers).When a message arrives exchange chip, first we can go to determine seek scope according to VlanID, then removes to find out port according to target MAC (Media Access Control) address, if can not find, in this Vlan, broadcasts; If found, message is copied to this port.In this repeating process, can not modify to the content of frame.Certainly this table is also to upgrade by unceasing study.
Three layer retransmitting tables: three layer retransmitting tables comprise main frame routing table and network segment routing table.Main frame route is that ARP table produces, and then main frame route is written to main frame routing table, forwards for exact matching.The generation of network segment routing table can be the static routing of manual configuration, can be also three layers of dynamic routing that Routing Protocol is learnt.Can, if exchange chip is received a three-tier message, first it can search main frame routing table, see and corresponding message repeating is gone out, and looks into network segment routing table if do not found again, and carries out corresponding forwarding.
Exchange chip drives (SDK): it for other programs of upper strata provide service, makes other softwares can access and control exchange chip as bottom software.
L3 interface (three layer interfaces) modeling: it is equivalent to END (the Enhanced Network Driver in Vxworks (a kind of operating system), be enhanced network driver) drive, it is a kind of network-driven model that is operated in data link layer, this model definition with the mutual standard interface of MUX layer, user only needs to provide on request these interfaces can realize communicating by letter of END layer and network protocol layer according to specific network interface hardware characteristic.
MUX (Mutiplexer) layer: MUX layer has its oneself power function as network layer independently, mainly provides and its upper and lower two-layer interface of communicating by letter.
ICP/IP protocol stack: the ICP/IP protocol stack is here equivalent to network layer and transport layer, realizes some functions of network layer and transport layer.
ARP proxy module: it is a module of application layer, mainly realizes ARP proxy function.This module is the core that this patent realizes.Main realization acted on behalf of forwarding capability to the arp message of voice, data service under OLT, can be according to the difference of mode of operation, realize arp agency (same network segment is across the arp agency of vlan) and the arp agent functionality to all ip under same vlan of standard.
Fig. 2 is a basic networking diagram of intercommunication in our PON, in conjunction with this accompanying drawing we to introduce in detail host A be how with host B intercommunication.
In the time that host A is wanted to communicate by letter with host B, host A can send an ARP Request (ARP request) message and go to find the MAC Address of host B, but because this broadcast packet in PON equipment has been isolated between port, so ARP Request message cannot directly arrive host B.
The ARP Request message that host A sends can arrive the exchange chip of the main control unit of ONU1, line card, OLT successively, then arrive the CPU of the main control unit of OLT, and by the software processing moving in CPU, in CPU, its (referring to this ARP request message), arrived exchange chip driving before this, then arrive END and drive (three layers of virtual interface drive), in driving, END has corresponding three layer interfaces, i.e. the information of Supervlan (VLAN aggregation).
In general message can be sent to ICP/IP protocol stack after END drives, but the processing method is here the message that drives out through END directly to be delivered to ARP module process.
First ARP module can judge that whether object IP and source IP are at the same network segment after receiving message, as being exactly the network segment of having opened the Supervlan of ARP proxy function at the same network segment and this network segment, ARP proxy module will remove to search ARP table, sees that object MAC is whether in own ARP shows.If do not found, ARP proxy module can send ARP request message and go to learn the MAC Address of host B, this message drives and then arrives exchange chip through END driving, exchange chip successively, in exchange chip, this bag can be broadcast to each port, ONU2 also can receive this ARP Request broadcast packet naturally, is then sent to host B.
Host B receives after this ARP Request message that MAC Address that can study OLT shows and respond ARP Reply (ARP response) message of the MAC Address of carrying oneself to the ARP of oneself.This ARP Reply message can pass through that ONU2, line card, exchange chip, exchange chip drive, END drives, then arrive ARP proxy module successively.
ARP proxy module is just learnt the MAC Address of B to the ARP table of oneself after receiving this response message.Refresh the main frame routing table of exchange chip simultaneously.Again receiving host A when its (ARP proxy module) sends request after the ARP Request message of MAC Address of host B, because it knows how to find host B, so it can proxy the B IP that to go to host A transmission source IP be host B, source MAC is the ARP Reply message of the MAC of OLT oneself.Later every host A will be communicated by letter with host B, and packet directly forwards by table look-up (referring to main frame routing table) to exchange chip.
Certainly, if ARP module judges that object IP and source IP be not at the same network segment after receiving message, ARP module can not processed this message so, and the message of such cross-network segment should transfer to gateway to process.Equally, if the Supervlan of same network segment does not open ARP proxy function, ARP module can not processed this message yet.
The realization of the main control unit ARP proxy of OLT, based on a three-layer equipment, is to realize on the basis of Supervlan.Generally we open ARP proxy function at the Supervlan of second line of a couplet mouth to realize business intercommunication in PON.
The implementation procedure of ARP proxy function is as follows:
In the time that host A will be communicated by letter with host B, host A can send ARP request and go to find the MAC Address of host B, the IP that in this message, source IP is host A, and the MAC Address that source MAC is host A, the IP that object IP is host B, object MAC is full F, i.e. broadcasting packet.
In the main control unit of OLT, ARP proxy module receives after the ARP request message that host A sends that MAC Address that can study host A shows to own ARP, then judge whether this message is request message, whether legal, whether host B and host A be in the same network segment, and this network segment is exactly the network segment of having opened the Supervlan of ARP proxy function.
If so, ARP proxy module will remove to search ARP table, sees that object MAC is whether in own ARP shows.
If do not found, ARP proxy module can send ARP request message and go to learn the MAC Address of host B, and the source IP of this message is the IP that opens the Supervlan of ARP proxy, the MAC that source MAC is OLT, and the IP that object IP is host B, object MAC is full F.
Host B receives after this ARP request message that MAC Address that can study OLT shows and respond the arp response message of the MAC Address of carrying oneself to the ARP of oneself, the IP that its source IP is host B, source MAC is the MAC of host B, object IP is the IP that opens the Supervlan of ARP proxy, the MAC that object MAC is OLT.
ARP proxy module is just learnt the MAC Address of B to the ARP table of oneself after receiving this response message.
Again receiving host A when it sends request after the ARP request message of MAC Address of host B, because it knows how to find host B, so IP that it can be host B to host A transmission source IP, source MAC is the MAC of OLT oneself, object IP is the IP of host A, the ARP back message using of the MAC that object MAC is host A.
Host A is received after the ARP back message using that ARP proxy module sends in fact, host A does not know that MAC Address that it obtains is not the MAC Address of B, the ARP proxy module that is OLT has been cheated host A, but this deception is but good will for host A, otherwise host A just cannot have been learnt the MAC Address of host B.If ARP module judges that host B and host A be not at the same network segment certainly, host A and host B have not just been realized intercommunication by ARP proxy so, but realize intercommunication by gateway.The interacting message figure of the implementation procedure of ARP proxy is shown in accompanying drawing 3.
The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, anyone should learn all any modifications of making within the present invention's spirit and principle, be equal to replacement and improvement etc., within being all contained in protection scope of the present invention.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (2)
1. the method for the interior business intercommunication of PON under a layer function networking, it is characterized in that: directly OLT is made to a three-layer equipment, and in the main control unit of OLT, increase ARP proxy module, and under three layer function networkings, finally realize the intercommunication of voice-and-data business in PON;
Described three layer function networkings, are OLT configuration of IP address, make it can be operated in network layer, realize Routing Protocol, and then realize three layer data forwardings, also can realize the function of data link layer,
In the time that host A is wanted to communicate by letter with host B, host A can send an ARP request message and go to find the MAC Address of host B, this ARP request message arrives the exchange chip of the main control unit of line card, the OLT of the ONU being connected with host A, the OLT being connected with this ONU successively, then arrive the CPU of the main control unit of OLT, and by the software processing moving in CPU
In CPU, this ARP request message arrived exchange chip driving before this, then arrived END and drove, and in END drives, had corresponding three layer interfaces, i.e. the information of Supervlan,
The message that drives out through END is directly delivered to ARP module and processes,
First ARP module can judge that whether object IP and source IP are at the same network segment after receiving message, as being exactly the network segment of having opened the Supervlan of ARP proxy function at the same network segment and this network segment, ARP proxy module will remove to search ARP table, sees that object MAC is whether in own ARP shows
If do not found, ARP proxy module can send ARP request message and go to learn the MAC Address of host B, this message drives and then arrives exchange chip through END driving, exchange chip successively, in exchange chip, using this ARP request message as ARP, request broadcast packet can be broadcast to each port, the ONU being connected with host B receives this ARP request broadcast packet, then be sent to host B
Host B receives after this ARP request message that MAC Address that can study OLT shows and respond the ARP back message using of the MAC Address of carrying oneself to the ARP of oneself,
ARP back message using is successively through the exchange chip of the main control unit of the line card of the ONU that is connected with host B, the OLT that is connected with this ONU, OLT, exchange chip driving, END driving, then arrive ARP proxy module,
ARP proxy module is just learnt the MAC Address of host B to the ARP table of oneself after receiving this response message, refresh the main frame routing table in three layer retransmitting tables of exchange chip simultaneously, again receiving host A when ARP proxy module sends request after the ARP request message of MAC Address of host B, the IP that it is host B that meeting proxy B goes to host A transmission source IP, source MAC is the ARP back message using of the MAC of OLT oneself, later every host A will be communicated by letter with host B, and packet directly forwards by looking into main frame routing table to exchange chip.
2. the method for the interior business intercommunication of PON under three layer function networkings as claimed in claim 1, is characterized in that, described OLT comprises: CPU element and exchange chip, store two-layer retransmitting table and three layer retransmitting tables at exchange chip,
Two-layer retransmitting table: be also referred to as mac address forwarding table, this table is made up of three elements is respectively VlanID, MAC Address and port numbers PortID;
Three layer retransmitting tables: comprise main frame routing table and network segment routing table, main frame route is that ARP table produces, and then main frame route is written to main frame routing table, forwards for exact matching, the static routing that is produced as manual configuration of network segment routing table, or be three layers of dynamic routing that Routing Protocol is learnt;
In CPU element, store exchange chip and drive, it for other programs of upper strata provide service, makes other softwares can access and control exchange chip as bottom software;
The upper strata that exchange chip drives is three layer interface L3 interface modelings: the END being equivalent in Vxworks drives, it is a kind of network-driven model that is operated in data link layer, this model definition with the mutual standard interface of MUX layer, user only needs to provide on request these interfaces can realize communicating by letter of END layer and network protocol layer according to specific network interface hardware characteristic;
The upper strata of three layer interface L3 interface modelings is MUX layer: provide and its upper and lower two-layer interface of communicating by letter;
The upper strata of MUX layer is ICP/IP protocol stack: this TCP/IP protocol stack is equivalent to network layer and transport layer, realizes the function of network layer and transport layer;
The upper strata of ICP/IP protocol stack is ARP proxy module: a module that is application layer, realize ARP proxy function, comprise: the arp message to voice, data service under OLT is acted on behalf of forwarding capability, according to the difference of mode of operation, realize arp agency and the arp agent functionality to all ip under same vlan of standard, the arp agency of described standard refers to the arp agency of same network segment across vlan.
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| CN103546595B (en) * | 2013-10-31 | 2017-01-25 | 烽火通信科技股份有限公司 | Mainframe route maintaining method based on xPON |
| CN104702708B (en) * | 2013-12-06 | 2018-04-27 | 华为技术有限公司 | Obtain method, equipment, system and the network virtualization endpoint of ARP information |
| CN103685610B (en) * | 2013-12-25 | 2018-03-13 | 上海寰创通信科技股份有限公司 | A kind of method for realizing ARP proxy |
| CN105472486B (en) * | 2016-01-08 | 2019-02-22 | 烽火通信科技股份有限公司 | A kind of PON access system prevents the processing method of route loop |
| CN108259644B (en) * | 2018-01-18 | 2020-12-08 | 新华三技术有限公司 | Communication equipment and ARP table entry generation method thereof |
| CN108512721A (en) * | 2018-03-05 | 2018-09-07 | 山东超越数控电子股份有限公司 | A kind of three layers of stability test method of multi-exchange |
| CN108965135B (en) * | 2018-05-25 | 2021-05-04 | 西安云维智联科技有限公司 | Address self-learning method for Ethernet and fiber channel conversion equipment |
| CN108712520B (en) * | 2018-05-31 | 2021-03-23 | 安科讯(福建)科技有限公司 | Terminal IP address transparent transmission system and method based on LTE wireless private network |
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