CN102148766A - 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 the 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 making rapid progress of the communication technology, people have also presented development in pluralism to the demand of communication service.Traditional Access Network is by copper wire access, owing to be subject to the transmission attenuation of signal, the coverage that causes general end office (EO) is in 3Km, and end office's quantity is a lot, and operator's cost control has been brought challenge, can't satisfy nowadays bandwidth and multiple services demand simultaneously.Is that the optical fiber connecting method of major technique has realized plurality of advantages such as two-forty, big capacity, high security and nowadays we realize with the PON technology, is the mainstream technology of Access Network development nowadays.
PON (EPON) is meant and does not contain any electronic device and electronic power supply in the optical distribution network.A typical PON system is made up of three parts: optical line terminal (OLT), Optical Distribution Network (0DN) and optical network unit (ONUs).The PON system adopts wavelength-division multiplex technique, and (wavelength-division multiplexing WDM), realizes the 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 upstream data in turn; Descending employing broadcast mode, each ONU can distribute a unique identification code after succeeding in registration, when ONU receives data, receive only the frame or the broadcast frame that meet own identification code.PON is the optical access network of a point to multiple spot, and it can provide the transmission of reliable voice, data and video traffic for the user.
Data service is isolated mutually between the requirement PON of the telecom operators internal system different user, so that user's maintenance and management, this has just caused the directly intercommunication of user under the ONU that hangs under the OLT.Traditional OLT is a two-layer equipment, so in order to realize service intercommunication in the PON, be by connect a three-layer equipment again in the OLT upper united mouth, must could realize data business communicating in the 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 the PON, patent " realizes the EPON system of voice intercommunication, local side apparatus and method " (application number: propose a kind of like this method 200910143663.8): be to increase a VOIP (Voice over Internet Protocol in the OLT the inside, with the digitlization of simulated sound signal, pattern with data packet is done real-time transmission on the IP data network) dish and ARP (address resolution protocol) proxy module that is complementary with it and is provided with, this VOIP dish is used to connect a plurality of IAD (integrated access equipment), described ARP proxy module is used to be communicated with source IAD and purpose IAD, this mode can realize the loopback of voice flow in the PON really, but this also is based on the realization of a two-layer equipment, also can only satisfy the intercommunication of speech business, and, can not realize surface speed forwarding for data service at a high speed by software or DSP (Digital Signal Processing) realization.To sum up tell, the demand in this method incompatibility epoch can not be given full play to the effect of OLT.
Summary of the invention
At the defective that exists in the 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 method, solved complexity for realizing that business intercommunication must connect a three-layer equipment again and will additionally increase a VOIP dish in OLT in the PON outside OLT equipment based on business intercommunication in the PON under the three layer function networkings.
For reaching above purpose, the technical scheme that the present invention takes is:
The method of business intercommunication in the PON under a kind of three layer function networkings, it is characterized in that: directly OLT is made a three-layer equipment, and in the main control unit of OLT, increase the ARP proxy module, and under three layer function networkings, finally realize voice-and-data service intercommunication in the PON;
Described three layer function networkings are the OLT configuration of IP address, make it can be operated in network layer, realize Routing Protocol, and then realize the forwarding of three layer data, also can realize the function of data link layer.
On the basis of technique scheme, comprise among the described OLT: CPU element and exchange chip, store two-layer retransmitting table and three layer retransmitting tables at exchange chip,
Two-layer retransmitting table: also be referred to as mac address forwarding table, this table is made 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, the main frame route is that the ARP table produces, and the main frame route is written to the main frame routing table then, is used for accurately coupling forwarding, 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;
Store exchange chip and drive in CPU element, it for other programs of upper strata provide service, makes other softwares can visit and control exchange chip as bottom software;
Three layer interface L3 interface modelings: the END that is equivalent among the 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, the user only need provide these interfaces can realize communicating by letter of END layer and network protocol layer according to particular network interface hardware characteristic on request;
MUX layer: provide and its two-layer interface of communicating by letter up and down;
The 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 the ARP proxy function, comprise: the arp message to voice, data service under the OLT is acted on behalf of forwarding capability, difference according to mode of operation, the arp of realization standard agency and to the arp agent functionality of all ip under the same vlan, the arp agency of described standard refer to that same network segment strides the arp agency of vlan.
On the basis of technique scheme, when host A is wanted to communicate by letter with host B, host A can send the MAC Address that an ARP request message removes to seek host B, this ARP request message arrives the exchange chip of main control unit of ply-yarn drill, the OLT of the ONU that is connected with host A, the OLT that is connected with this ONU successively, arrive the CPU of the main control unit of OLT then, and by the software processes of moving among the CPU
This ARP request message arrived exchange chip before this and drove in CPU, arrive END then and drove, and in the END driving corresponding three layer interfaces was arranged, i.e. the information of Supervlan,
To directly deliver to the ARP module through the message that END drives out and handle,
The ARP module can judge at first that whether purpose 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, the ARP proxy module will remove to search ARP table, sees that purpose MAC is whether in own ARP shows
If do not find, then the ARP proxy module can send the MAC Address that the ARP request message removes to learn host B, this message drives through END driving, exchange chip successively and arrives exchange chip then, this bag can be broadcast to each port in exchange chip, the ONU that is connected with host B receives this ARP request broadcast packet, be sent to host B then
Host B receive behind this ARP request message can study OLT MAC Address show and the ARP back message using of the MAC Address of oneself is carried in response to own ARP,
The ARP back message using is successively through the exchange chip of the main control unit of the ply-yarn drill of the ONU that is connected with host B, the OLT that is connected with this ONU, OLT, exchange chip driving, END driving, arrive the ARP proxy module then,
The ARP proxy module is just learnt the ARP table of the MAC Address of B to oneself after receiving this response message, refresh the main frame routing table of exchange chip simultaneously, after the ARP proxy module receives that once more host A sends the ARP request message of MAC Address of requesting host B, it is the IP of host B that meeting proxy B goes to send source IP to host A, 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 is directly transmitted by looking into the main frame routing table to exchange chip.
The method of business intercommunication in the PON is directly made OLT a three-layer equipment under the three layer function networkings of the present invention, and increases the ARP proxy module in the main control unit of OLT, finally realizes voice-and-data service intercommunication in the PON.
Usefulness of the present invention is:
Need not external three-layer equipment and increase a VOIP and coil the intercommunication that realizes data and speech business in the PON in that OLT is inner extra, we directly make a three-layer equipment with OLT, and realize the ARP proxy function in the main control unit of OLT.Do making the interior voice-and-data service intercommunication of PON all can finish like this, 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 in OLT inside.
Description of drawings
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 the three layer function networkings of the present invention in the PON in the method for business intercommunication, directly OLT is made a three-layer equipment, and in the main control unit of OLT, increase the ARP proxy module, and under three layer function networkings, finally realize voice-and-data service intercommunication in the PON; So-called three layer function networkings are the OLT configuration of IP address, make it can be operated in network layer, realize Routing Protocol, and then realize the forwarding of three layer data, 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.Below we are briefly described various piece function wherein:
Two-layer retransmitting table: we also are referred to as MAC (Medium/MediaAccess Control, medium access control) addresses forwarding table, this table is made of three elements, is respectively Vlan (Virtual Local Area Network, VLAN) ID, MAC Address and PortID (port numbers).When a message arrival exchange chip, we at first can go to determine seek scope according to VlanID, remove to find out port according to target MAC (Media Access Control) address then, if can not find, then broadcast in this Vlan; If found, then message is copied to this port.In this repeating process, can not make amendment to the content of frame.Certainly this table also is to upgrade by continuous study.
Three layer retransmitting tables: three layer retransmitting tables comprise main frame routing table and network segment routing table.The main frame route is that the ARP table produces, and the main frame route is written to the main frame routing table then, is used for accurately coupling forwarding.The generation of network segment routing table can be the static routing of manual configuration, also can be three layers of dynamic routing that Routing Protocol is learnt.Can if exchange chip is received a three-tier message, it at first can search the main frame routing table, see corresponding message is forwarded, and does not look into network segment routing table again if find, and carries out corresponding forwarding.
Exchange chip drives (SDK): it for other programs of upper strata provide service, makes other softwares can visit and control exchange chip as bottom software.
L3 interface (three layer interfaces) modeling: it is equivalent to END (the Enhanced Network Driver among the Vxworks (a kind of operating system), be the 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, the user only need provide these interfaces can realize communicating by letter of END layer and network protocol layer according to particular network interface hardware characteristic on request.
MUX (Mutiplexer) layer: the MUX layer has its own power function as network layer independently, mainly provide with its about two-layer interface of communicating by letter.
The ICP/IP protocol stack: the ICP/IP protocol stack here is equivalent to network layer and transport layer, realizes some functions of network layer and transport layer.
The ARP proxy module: it is a module of application layer, mainly realizes the ARP proxy function.This module is the core that this patent realizes.The main realization acted on behalf of forwarding capability to the arp message of voice, data service under the OLT, can be according to the difference of mode of operation, realize the arp agency (same network segment is striden the arp agency of vlan) of standard and to the arp agent functionality of all ip under the same vlan.
Fig. 2 is a basic networking diagram of intercommunication in we PON, in conjunction with this accompanying drawing we to introduce host A in detail be how with the host B intercommunication.
When host A is wanted to communicate by letter with host B, host A can send an ARP Request (ARP request) message and go to seek the MAC Address of host B, but owing to this broadcast packet in the PON equipment has been isolated between port, so ARP Request message can't directly arrive host B.
The ARP Request message that host A sends can arrive the exchange chip of the main control unit of ONU1, ply-yarn drill, OLT successively, arrive the CPU of the main control unit of OLT then, and by the software processes of moving among the CPU, its (referring to this ARP request message), arrived the exchange chip driving before this in CPU, arrive END then and drive (three layers of virtual interface drive), in END drives, corresponding three layer interfaces are arranged, i.e. the information of Supervlan (VLAN aggregation).
In general message can be sent to the ICP/IP protocol stack after driving through END, yet the processing method here is the message that drives out through END directly to be delivered to the ARP module handle.
The ARP module can judge at first that whether purpose 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, the ARP proxy module will remove to search ARP table, sees that purpose MAC is whether in own ARP shows.If do not find, then the ARP proxy module can send the MAC Address that the ARP request message removes to learn host B, this message drives through END driving, exchange chip successively and arrives exchange chip then, this bag can be broadcast to each port in exchange chip, ONU2 also can receive this ARP Request broadcast packet naturally, is sent to host B then.
Host B receive behind this ARP Request message can study OLT MAC Address show and ARP Reply (ARP response) message of the MAC Address of oneself is carried in response to own ARP.This ARP Reply message can pass through successively that ONU2, ply-yarn drill, exchange chip, exchange chip drive, END drives, arrive the ARP proxy module then.
The ARP proxy module is just learnt the ARP table of the MAC Address of B to oneself after receiving this response message.Refresh the main frame routing table of exchange chip simultaneously.After its (ARP proxy module) receives that once more host A sends the ARP Request message of MAC Address of requesting host B, because it knows how to find host B, so it can proxy B to go to send source IP to host A be the IP of 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 is directly transmitted by table look-up (referring to the main frame routing table) to exchange chip and got final product.
Certainly, if the ARP module is judged purpose IP and source IP not at the same network segment after receiving message, the ARP module can not handled this message so, and the message of such inter-network section should be transferred to gateway and handle.Equally, if the Supervlan of same network segment does not open the ARP proxy function, then the ARP module can not handled this message yet.
The realization of the main control unit ARP proxy of OLT is based on a three-layer equipment, promptly is to realize on the basis of Supervlan.Generally we open the ARP proxy function at the Supervlan of second line of a couplet mouth to realize business intercommunication in the PON.
The implementation procedure of ARP proxy function is as follows:
When host A will be communicated by letter with host B, host A can send the MAC Address that the ARP request removes to seek host B, and source IP is the IP of host A in this message, and source MAC is the MAC Address of host A, and purpose IP is the IP of host B, and purpose MAC is full F, i.e. broadcasting packet.
In the main control unit of OLT the ARP proxy module receive behind the ARP request message that host A sends can the study host A MAC Address show to own ARP, judge then whether this message is the 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 the ARP proxy module will remove to search ARP table, see that purpose MAC is whether in own ARP shows.
If do not find, then the ARP proxy module can send the MAC Address that the ARP request message removes to learn host B, and the source IP of this message is the IP of the Supervlan of unlatching ARP proxy, and source MAC is the MAC of OLT, and purpose IP is the IP of host B, and purpose MAC is full F.
Host B receive behind this ARP request message can study OLT MAC Address show and the arp response message of the MAC Address of oneself is carried in response to own ARP, its source IP is the IP of host B, source MAC is the MAC of host B, purpose IP is the IP of the Supervlan of unlatching ARP proxy, and purpose MAC is the MAC of OLT.
The ARP proxy module is just learnt the ARP table of the MAC Address of B to oneself after receiving this response message.
After it receives that once more host A sends the ARP request message of MAC Address of requesting host B, because it knows how to find host B, so it can send source IP to host A is the IP of host B, source MAC is the MAC of OLT oneself, purpose IP is the IP of host A, and purpose MAC is the ARP back message using of the MAC of host A.
After host A is received the ARP back message using that the ARP proxy module sends in fact, host A is not known the MAC Address that its resulting that MAC Address is not B, the ARP proxy module that is OLT has been cheated host A, but this deception but is well-meaning for host A, otherwise host A just can't have been learnt the MAC Address of host B.If the ARP module is judged host B and host A 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 sees accompanying drawing 3.
The above is preferred embodiment of the present invention only, is not limited to the present invention, and anyone should learn all any modifications of being made, be equal to replacement and improvement etc. within the present invention's spirit and principle, all be contained within protection scope of the present invention.
The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.
Claims (3)
1. the method for business intercommunication in the PON under the layer function networking, it is characterized in that: directly OLT is made a three-layer equipment, and in the main control unit of OLT, increase the ARP proxy module, and under three layer function networkings, finally realize voice-and-data service intercommunication in the PON;
Described three layer function networkings are the OLT configuration of IP address, make it can be operated in network layer, realize Routing Protocol, and then realize the forwarding of three layer data, also can realize the function of data link layer.
2. the method for business intercommunication in the PON is characterized in that under the three layer function networkings as claimed in claim 1, comprises among the described OLT: CPU element and exchange chip, store two-layer retransmitting table and three layer retransmitting tables at exchange chip,
Two-layer retransmitting table: also be referred to as mac address forwarding table, this table is made 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, the main frame route is that the ARP table produces, and the main frame route is written to the main frame routing table then, is used for accurately coupling forwarding, 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;
Store exchange chip and drive in CPU element, it for other programs of upper strata provide service, makes other softwares can visit and control exchange chip as bottom software;
The upper strata that exchange chip drives is three layer interface L3 interface modelings: the END that is equivalent among the 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, the user only need provide these interfaces can realize communicating by letter of END layer and network protocol layer according to particular network interface hardware characteristic on request;
The upper strata of three layer interface L3 interface modelings is the MUX layer: provide and its two-layer interface of communicating by letter up and down;
The upper strata of MUX layer is the 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;
The upper strata of ICP/IP protocol stack is the ARP proxy module: a module that is application layer, realize the ARP proxy function, comprise: the arp message to voice, data service under the OLT is acted on behalf of forwarding capability, difference according to mode of operation, the arp of realization standard agency and to the arp agent functionality of all ip under the same vlan, the arp agency of described standard refer to that same network segment strides the arp agency of vlan.
3. the method for business intercommunication in the PON under the three layer function networkings as claimed in claim 2, it is characterized in that: when host A is wanted to communicate by letter with host B, host A can send the MAC Address that an ARP request message removes to seek host B, this ARP request message arrives the exchange chip of main control unit of ply-yarn drill, the OLT of the ONU that is connected with host A, the OLT that is connected with this ONU successively, arrive the CPU of the main control unit of OLT then, and by the software processes of moving among the CPU
This ARP request message arrived exchange chip before this and drove in CPU, arrive END then and drove, and in the END driving corresponding three layer interfaces was arranged, i.e. the information of Supervlan,
To directly deliver to the ARP module through the message that END drives out and handle,
The ARP module can judge at first that whether purpose 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, the ARP proxy module will remove to search ARP table, sees that purpose MAC is whether in own ARP shows
If do not find, then the ARP proxy module can send the MAC Address that the ARP request message removes to learn host B, this message drives through END driving, exchange chip successively and arrives exchange chip then, in exchange chip, this ARP request message can be broadcast to each port as ARP request broadcast packet, the ONU that is connected with host B receives this ARP request broadcast packet, be sent to host B then
Host B receive behind this ARP request message can study OLT MAC Address show and the ARP back message using of the MAC Address of oneself is carried in response to own ARP,
The ARP back message using is successively through the exchange chip of the main control unit of the ply-yarn drill of the ONU that is connected with host B, the OLT that is connected with this ONU, OLT, exchange chip driving, END driving, arrive the ARP proxy module then,
The ARP proxy module is just learnt the ARP table of the MAC Address of host B to oneself after receiving this response message, refresh the main frame routing table in three layer retransmitting tables of exchange chip simultaneously, after the ARP proxy module receives that once more host A sends the ARP request message of MAC Address of requesting host B, it is the IP of host B that meeting proxy B goes to send source IP to host A, 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 is directly transmitted by looking into the main frame routing table to exchange chip.
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