CN101267681A - An access device and multicast control method for passive optical network - Google Patents
An access device and multicast control method for passive optical network Download PDFInfo
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- CN101267681A CN101267681A CNA2008100667664A CN200810066766A CN101267681A CN 101267681 A CN101267681 A CN 101267681A CN A2008100667664 A CNA2008100667664 A CN A2008100667664A CN 200810066766 A CN200810066766 A CN 200810066766A CN 101267681 A CN101267681 A CN 101267681A
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Abstract
The invention discloses an access device of a passive optical network and a multicast control method, the access device comprises an optical network unit module and a data exchange control module, the optical network unit module detects multicast application of a user port and sets a multicast filtering table; the data exchange control module controls multicast filtering of the optical network unit module and the exchange control module based on the multicast application of the user port, and controls multicast transferring based on multicast filtering; or the data exchange control module executes user multicast authentication based on a predetermined multicast control authority or based on interaction information with a multicast server, and controls multicast transferring based on the multicast filtering table. With access device of the invention, the processing process of multicast filtering is dispersed from an OLT centralized device to a plurality of access devices, thereby reducing interaction between the OLT and an ONU without increasing cost, further reducing load of OLT multicast processing, improving the processing ability of the OLT, and reducing fault probability.
Description
Technical field
The present invention relates to the access technology in the communication network, relate in particular to a kind of access device and multicast control method of EPON.
Background technology
Flourish along with broadband access, increasing family has used the broadband access network business.In numerous broadband access network business, multicast service is most important a kind of.Multicast service needs bigger bandwidth, thereby access technology had higher requirement, existing access technology comprises digital subscriber line (Digital Subscriber Line, be called for short DSL) insert and the Ethernet access, because the access speed of DSL is along with the increase of distance descends very fast, when multicast service surpasses access speed, cause certain obstacle for the developing multicast business, and the Ethernet switch distance is shorter, coverage is restricted, the general up optical fiber first line of a couplet that needs, the number of fibers that the access user needs more for a long time is huge.
Along with the development of optical transport technology, EPON (Passive Optical Network is called for short PON) is applied in the access technology gradually, and as a kind of new access technology, EPON can solve the problem of bandwidth and optical fiber saving.
The PON network has following important characteristic:
1) the PON mouth correspondence on the OLT (Optical Line Termial, optical line terminal) a plurality of ONU (Optical Network Unit, optical network unit) terminals.
2) down direction The data broadcast mode.
At present, though the PON network can provide higher bandwidth and save number of fibers, but general ONU is as ustomer premises access equipment, because the restriction of the splitting ratio (1: 64) of PON network, number of users under the PON port of an OLT is restricted, and original DSL subscriber's cable has caused waste because the use of PON network also goes out of use.
For the PON network, its down direction data are broadcasted, and this is very favorable for multicast.At present, in the existing multicast scheme, utilize the data broadcasting characteristics of down direction exactly, from OLT to ONU, create special multicast transmission passage.OLT obtains the group broadcasting program that the user asks by analyzing the request message of all IGMP from user side (Internet Group Management Protocol, Internet Group Management Protocol).OLT passs all these requested multicast data flows to each descending PON light oral instructions, OLT is by the multicast filtering of OMCI (ONU management and control interface) control ONU, and ONU receives after the multicast data flow, according to the needs of ONU oneself multicast data flow is filtered.
Consider the waste of limited and original DSL subscriber's cable of the number of users under the PON port of an OLT in the PON network, DSL subscriber's line access device of the PON first line of a couplet also occurred to solve aforementioned two problems simultaneously at present.In this case, may have a large amount of users under the access device of a PON first line of a couplet, at this moment, if also adopt above-mentioned multicast scheme, although then multicast data flow correctly can be delivered to ONU, but owing to have a plurality of users below the equipment of the PON first line of a couplet, OLT consumes a lot of disposal abilities of OLT system by the multicast filtering meeting of OMCI control ONU.
Summary of the invention
In view of above-mentioned background, the invention provides a kind of access device and multicast control method of EPON, can alleviate the load that OLT handles multicast.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of access device of EPON, be used for user port is linked into optical line terminal, described access device comprises optical network unit module and exchanges data control module, optical network unit module and optical line terminal coupling, exchanges data control module and the coupling of at least one user port, the downlink data of optical line terminal is transferred to user port through optical network unit module and exchanges data control module successively, and the upstream data of user port is transferred to optical line terminal through exchanges data control module and optical network unit module successively;
As a kind of access device of the present invention, the optical network unit module can comprise Internet Group Management Protocol and intercept the unit, is used to detect the multicast application of user port, and the multicast filtering table is set; The exchanges data control module can comprise Internet Group Management Protocol to be intercepted/agent unit, be used for authenticating according to default multicast control authority or according to finishing user multicast with the interactive information of multicast server, and according to described multicast filtering table control multicast forwarding.
As another kind of access device of the present invention, the exchanges data control module can comprise Internet Group Management Protocol and intercept/agent unit, be used for according to default multicast control authority or according to finishing the user multicast authentication with the interactive information of multicast server, and multicast application according to user port, control the multicast filtering of optical network unit module and exchanges data control module simultaneously, according to multicast filtering control multicast forwarding.
Described access device, interface channel between optical network unit module and the exchanges data control module comprises management channels and data channel, management channels is used to realize that the management information between optical network unit module and the exchanges data control module is mutual, and data channel is used to realize the data interaction between optical network unit module and the exchanges data control module.
Described management channels is the logical channel of data channel, perhaps is independent transfer bus.
Described independent transfer bus is address data bus or I2C bus.
Described access device, user port can be digital subscriber line interfacing or Ethernet interface.
The invention also discloses a kind of multicast control method of EPON, comprise following steps:
A1, optical network unit module and exchanges data control module are set on the access device of EPON;
A2, optical network unit module detect the multicast application of user port, and the multicast filtering table are set;
A3, exchanges data control module authenticate according to default multicast control authority or according to finishing user multicast with the interactive information of multicast server, and according to described multicast filtering table control multicast forwarding.
The multicast control method of another kind of EPON of the present invention comprises following steps:
B1, optical network unit module and exchanges data control module are set on the access device of EPON;
B2, exchanges data control module are according to default multicast control authority or according to finishing the user multicast authentication with the interactive information of multicast server, and multicast application according to user port, control the multicast filtering of optical network unit module and exchanges data control module simultaneously, according to multicast filtering control multicast forwarding.
Access device of the present invention, utilize ONU module and exchanges data control module to finish multicast filtering, the processing procedure of multicast filtering is distributed to a plurality of access devices from the so concentrated equipment of OLT, thereby do not increasing condition of cost, reduce centre mutual of OLT and ONU, and then alleviated the load that OLT handles multicast, and improve the disposal ability of OLT, reduce probability of malfunction.
Description of drawings
Fig. 1 is the overall framework figure of the access device of the specific embodiment of the invention;
Fig. 2 is the frame diagram of access device when inserting the DSL interface of the specific embodiment of the invention;
Fig. 3 is the frame diagram of access device when access network based on ethernet of the specific embodiment of the invention;
Fig. 4 is a kind of module map of multicast control mode of the access device of the specific embodiment of the invention;
Fig. 5 is the module map that the present invention specifically implements the another kind of multicast control mode of the access device that protects.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
As shown in Figure 1, the access device of the PON first line of a couplet of the specific embodiment of the invention comprises PON ONU module and exchanges data control module.Can be connected with management channels to finish data interaction by data channel between ONU module and the exchanges data control module, data channel is mainly used in the bearer service data, and management channels then is used for bearer management information.ONU module first line of a couplet OLT, finish the reception and the transmission of OLT light signal, and the business datum by the mutual for example multicast packet of data channel and exchanges data control module etc., undertaken alternately by the CPU (CPU) in management channels and the exchanges data control module, finish management function, management channels can be set up by the logical channel that data channel is set, and also can pass through independent transfer bus, address data bus for example, perhaps the I2C bus is set up.At least one user port of the exchanges data control module second line of a couplet, port type can be the DSL interface, also can be Ethernet interface, the exchanges data control module is used to finish forwarding of data and duplicates.
As Fig. 2, insert for DSL, the exchanges data control module comprises that exchanges data chip and dsl data handle nest plate and CPU, and the exchanges data chip is used to be accomplished to the data transmit-receive of ONU module and to the forwarding of data of user port, for multicast packet, control is duplicated according to multicast.Dsl data is handled the data format that nest plate is used to receive the DSL track data and converts the PON network carrying to, and sends to the exchanges data chip, receives the data of exchanges data chip transmission simultaneously and converts DSL circuit data carried by data to.CPU is used to finish the management and the corresponding service processing of access device, and the authentication management of processing multicast service also can be managed the ONU module by management channels.
As Fig. 3, insert for Ethernet, the exchanges data control module comprises exchanges data chip and CPU, the exchanges data chip when its function inserts to aforementioned DSL is similar with CPU.
As Fig. 4, a kind of multicast control mode of the access device of the PON first line of a couplet of the specific embodiment of the invention is:
1, realizes IGMP Snooping (IGMP snooping by the IGMP snooping unit on the ONU module, it is a kind of method that solves the broadcast flooding on two-layer network device of IP multicast, by the IGMP protocol message of listen for user end and multicast path on two-layer network device by equipment room, obtain the user list information of multicast service, multicast packet is transmitted according to current user profile, is suppressed the purpose that Layer 2 Multicast spreads unchecked thereby reach) function.Detect the multicast request of user applies, and the multicast filtering table of PON ONU is set, the multicast packet of user applies is handed down to the exchanges data control module;
2, the exchanges data control module realizes IGMP Snooping/proxy (IGMP proxy by IGMP snooping/agent unit, igmp proxy, it is the solution that provides for the multicast service of two-layer equipment by agency mechanism, realized the two-layer network device of IGMP proxy, user side is born the role of Server (server), regular searching user's information is born the role of Client (client) again for network route side, when needed current user profile is sent to network.Not only can reach and suppress the purpose that Layer 2 Multicast spreads unchecked, more can obtain and control user profile effectively, play a role aspect the network load to reduce reducing the network side protocol message simultaneously) function.And, control multicast forwarding according to the multicast filtering table that the ONU module is provided with by default multicast control authority or according to finishing the user multicast authentication alternately with multicast server.
As Fig. 5, the another kind of multicast control mode of the access device of the PON first line of a couplet of the specific embodiment of the invention is:
1, realizes the function of IGMPSnooping/proxy on the exchanges data control module by IGMP snooping/agent unit, and by default multicast control authority or according to finishing the user multicast authentication alternately with multicast server, requirement according to the multicast application, the exchanges data control module is controlled the multicast filtering of ONU and exchanges data control module by management channels, and controls the forwarding of multicast according to multicast filtering.
The multicast control method of the specific embodiment of the invention, two kinds of multicast control modes corresponding to above-mentioned access device do not repeat them here.
In above-mentioned multicast control, the default multicast control authority of exchanges data control module comprises authorities such as mandate, unauthorized, preview, the multicast service that the exchanges data control module is tackled each user mutually according to each user's multicast authority is controlled, and is forwarded to which user according to multicast filtering table control group business stream.
The access device of the application of the invention not only can effectively use existing service cable with saving first line of a couplet optical fiber, and can expand the number of users that single OLT connects down; Simultaneously by in access device, finishing the multicast filtering function, thereby no longer need OLT that the multicast filtering of ONU is controlled, alleviated the processing burden of OLT.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. the access device of an EPON, be used for user port is linked into optical line terminal, it is characterized in that, described access device comprises optical network unit module and exchanges data control module, described optical network unit module and optical line terminal coupling, described exchanges data control module and the coupling of at least one user port, the downlink data of optical line terminal is transferred to user port through described optical network unit module and described exchanges data control module successively, and the upstream data of user port is transferred to optical line terminal through described exchanges data control module and described optical network unit module successively;
Comprise Internet Group Management Protocol in the described optical network unit module and intercept the unit, be used to detect the multicast application of user port, and the multicast filtering table is set; Described exchanges data control module comprises Internet Group Management Protocol to be intercepted/agent unit, be used for authenticating according to default multicast control authority or according to finishing user multicast with the interactive information of multicast server, and according to described multicast filtering table control multicast forwarding.
2. the access device of an EPON, be used for user port is linked into optical line terminal, it is characterized in that, described access device comprises optical network unit module and exchanges data control module, described optical network unit module and optical line terminal coupling, described exchanges data control module and the coupling of at least one user port, the downlink data of optical line terminal is transferred to user port through described optical network unit module and described exchanges data control module successively, and the upstream data of user port is transferred to optical line terminal through described exchanges data control module and described optical network unit module successively;
Described exchanges data control module comprises Internet Group Management Protocol and intercepts/agent unit, be used for according to default multicast control authority or according to finishing the user multicast authentication with the interactive information of multicast server, and multicast application according to user port, control the multicast filtering of optical network unit module and exchanges data control module simultaneously, according to multicast filtering control multicast forwarding.
3. access device as claimed in claim 1 or 2, it is characterized in that, interface channel between described optical network unit module and the described exchanges data control module comprises management channels and data channel, described management channels is used to realize that the management information between described optical network unit module and the described exchanges data control module is mutual, and described data channel is used to realize the data interaction between described optical network unit module and the described exchanges data control module.
4. access device as claimed in claim 3 is characterized in that, described management channels is the logical channel of data channel, perhaps is independent transfer bus.
5. access device as claimed in claim 4 is characterized in that, described independent transfer bus is address data bus or I2C bus.
6. access device as claimed in claim 1 or 2 is characterized in that, described user port is digital subscriber line interfacing or Ethernet interface.
7. the multicast control method of an EPON is characterized in that, comprises following steps:
A1, optical network unit module and exchanges data control module are set on the access device of EPON;
A2, optical network unit module detect the multicast application of user port, and the multicast filtering table are set;
A3, exchanges data control module authenticate according to default multicast control authority or according to finishing user multicast with the interactive information of multicast server, and according to described multicast filtering table control multicast forwarding.
8. the multicast control method of an EPON is characterized in that, comprises following steps:
B1, optical network unit module and exchanges data control module are set on the access device of EPON;
B2, exchanges data control module are according to default multicast control authority or according to finishing the user multicast authentication with the interactive information of multicast server, and multicast application according to user port, control the multicast filtering of optical network unit module and exchanges data control module simultaneously, according to multicast filtering control multicast forwarding.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771901A (en) * | 2008-12-31 | 2010-07-07 | 华为技术有限公司 | Method of multicast permission control in passive optical network, system and multi-dwelling unit |
| WO2010148871A1 (en) * | 2009-11-20 | 2010-12-29 | 中兴通讯股份有限公司 | Passive optical network system for wavelength division and time division hybrid multiplexing |
| CN101616345B (en) * | 2009-07-29 | 2012-05-09 | 中兴通讯股份有限公司 | Method and device for bridging ONU in EPON network |
| CN103501472A (en) * | 2013-10-24 | 2014-01-08 | 烽火通信科技股份有限公司 | Passive optical network controllable multicast system and implementing method |
| CN104104523A (en) * | 2013-04-07 | 2014-10-15 | 中兴通讯股份有限公司 | Method of transmitting multicast service between optical fiber and copper cable, device and system |
-
2008
- 2008-04-23 CN CNA2008100667664A patent/CN101267681A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771901A (en) * | 2008-12-31 | 2010-07-07 | 华为技术有限公司 | Method of multicast permission control in passive optical network, system and multi-dwelling unit |
| CN101771901B (en) * | 2008-12-31 | 2013-04-24 | 华为技术有限公司 | Method of multicast permission control in passive optical network, system and multi-dwelling unit |
| CN101616345B (en) * | 2009-07-29 | 2012-05-09 | 中兴通讯股份有限公司 | Method and device for bridging ONU in EPON network |
| WO2010148871A1 (en) * | 2009-11-20 | 2010-12-29 | 中兴通讯股份有限公司 | Passive optical network system for wavelength division and time division hybrid multiplexing |
| CN102075819A (en) * | 2009-11-20 | 2011-05-25 | 中兴通讯股份有限公司 | Wave time division mixed multiplexing passive optical network system |
| CN104104523A (en) * | 2013-04-07 | 2014-10-15 | 中兴通讯股份有限公司 | Method of transmitting multicast service between optical fiber and copper cable, device and system |
| WO2014166186A1 (en) * | 2013-04-07 | 2014-10-16 | 中兴通讯股份有限公司 | Method, apparatus and system for multicast service transfer between fiber and copper cable |
| CN103501472A (en) * | 2013-10-24 | 2014-01-08 | 烽火通信科技股份有限公司 | Passive optical network controllable multicast system and implementing method |
| CN103501472B (en) * | 2013-10-24 | 2016-05-25 | 烽火通信科技股份有限公司 | EPON controllable multicast system and implementation method |
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Open date: 20080917 |