CN104378303A - Method and system for forwarding multicast service, ONU and OLT - Google Patents
Method and system for forwarding multicast service, ONU and OLT Download PDFInfo
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Abstract
The invention provides a method and system for forwarding a multicast service, an optical network unit and an optical line terminal. The method comprises the steps that a first multicast service message from the optical line terminal (OLT) is unpacked through the ONU, judgment is carried out according to an logic link identifier (LLID) of lead code information and whether a first multicast service forwarding identifier of the first multicast service is allowed to be received or not, if the first multicast service forwarding identifier is allowed to be received, the first multicast service message is sent to a user, and otherwise the first multicast service message is discarded. The processing burden of the user of the ONU is relieved.
Description
Technical field
The present invention relates to ethernet passive optical network (EPON, Ethernet Passive Optical Network) technology, espespecially a kind of method and system of forwarding multicasting business, optical network unit ONU and optical line terminal OLT.
Background technology
The networking structure schematic diagram that Fig. 1 (a) is point-to-multipoint for EPON adopts.As shown in Fig. 1 (a), data carry out transmitted in both directions on single fiber, up direction is (namely from optical network unit (ONU, OpticalNetwork Unit) to optical line terminal (OLT, Optical Line Terminal) transmission) adopt time division multiplexing (TDM, Time-Division Multiplexing) transmission means, down direction (namely transmitting from OLT to ONU) adopt broadcast transmission.
Fig. 1 (b) is cascade system schematic diagram inner between OLT and ONU.As shown in Fig. 1 (b), each ONU comprises user and passive optical-fiber network (PON, Passive Optical Network) chip, and OLT also comprises user and PON chip.The method of existing forwarding multicasting business is:
ONU receives report (report) message from user, and report message comprises multicast internet protocol (IP, the Internet Protocol) address of user's on-demand multicasting business; ONU learns the multicast ip address in report message, generates multicast medium access control (MAC, Media AccessControl) addresses forwarding table, report message is sent to the PON chip of ONU;
The PON chip of ONU is by report message encapsulation preamble information; Wherein, preamble information comprises LLID starting delimiter (SLD, Start of LLID (LLID, Logical LinkIdentifier) Delimiter), LLID LLID (LLID of ONU self) and cyclic redundancy check (CRC) code (CRC, Cyclic Redundancy Check), also comprise 2 bytes that SLD retains and 2 bytes that SLD retains above below; Report message after encapsulation is sent to the PON chip of OLT by the PON chip of ONU by optical splitter;
After the PON chip of OLT removes the preamble information of report message, by report message repeating to OLT exchange chip; Report message is sent to multicast server after learning the multicast ip address in report message by OLT exchange chip;
After multicast server receives report message, group business stream corresponding for the multicast ip address in report message is sent to OLT;
Whether there is forwarding-table item corresponding to group business stream in multicast media access control (MAC, the MediaAccessControl) addresses forwarding table of study before user's detection of OLT, if do not exist, abandon group business stream; If exist, group business stream is forwarded to the PON chip of OLT;
Group business stream is encapsulated preamble information by the PON chip of OLT, and wherein LLID is packaged into 0X7FFF, and by the group business stream flood model after encapsulation to all ONU under PON interface; Fig. 2 is the frame structure schematic diagram of multicast service message of the group business stream after encapsulation, and wherein, SPD is SFD, MAC Address for the purpose of DA, SA is source MAC, and length/type is protocol type field, data field is the efficient message that user sends, and FCS is Frame Check Sequence;
The PON chip detection of ONU is 0X7FFF to the LLID of group business stream, group business stream is transmitted to the exchange chip of ONU; Before the exchange chip detection of ONU, whether the multicast mac address of study exists forwarding-table item corresponding to group business stream in transmitting, if do not exist, abandons group business stream, then group business stream is forwarded to end user as existed.
From above-mentioned flow process, we can find out, when OLT has multicast service to issue, if some ONU on-demand multicasting programs, all ONU under OLT same PON interface can receive group business stream, the PON chip of ONU directly by this data retransmission to ONU exchange chip, ONU exchange chip judge whether group business stream forwards according to multicast mac address table, so just increased the weight of ONU the processing load of exchange chip, waste ONU PON chip and the limited forwarding bandwidth of exchange chip, when network traffics are larger, data congestion can be caused, cause user data loss.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of method and system of forwarding multicasting business, optical network unit and optical line terminal, the processing load of the user of ONU can be alleviated.
In order to achieve the above object, the present invention proposes a kind of method of forwarding multicasting business, be applied to the optical network unit ONU be arranged between user and optical line terminal OLT, the method comprises:
ONU carries out decapsulation to the first multicast service message from optical line terminal OLT, according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then the first multicast service message is sent to user, otherwise, abandon this first multicast service message.
Preferably, also comprise before the method:
ONU sends to OLT to from after the second multicast service message encapsulation preamble information of user, and whether preamble information at least comprises the LLID of ONU and indicate ONU to ask the second multicast service of multicast service to forward mark.
Preferably, the second multicast service forwarding mark is uniquely corresponding with each ONU under OLT.
Preferably, in the binary coding of the preseting length in the first multicast service forwarding mark, location is uniquely corresponding with ONU really.
Preferably, the whole binary coding of the preseting length in the first multicast service forwarding mark is uniquely corresponding with ONU.
Preferably, when the second multicast service message from user is for report report message, ONU also comprises before report message encapsulation preamble information:
ONU learns the multicast internet protocol IP address in report message, generates multicast medium access control mac address forwarding table;
Report message encapsulation preamble information from user is comprised,
The LLID of ONU is saved in the LLID of preamble information, and the second multicast service forwarding mark of ONU is designated as request multicast service.
Preferably, when the multicast service message from user is for leaving message, ONU also comprised before leaving message encapsulation preamble information:
Delete during multicast mac address is transmitted the list item that the multicast ip address left in message is corresponding;
Message encapsulation preamble information of leaving from user is comprised:
The LLID of ONU is saved in the LLID of preamble information, and second multicast service of ONU is forwarded mark is designated as and does not ask multicast service.
Preferably, ONU receives the first multicast service message from OLT is query message.
The invention allows for a kind of method of forwarding multicasting business, be applied to the optical line terminal OLT between multicast server and optical network unit ONU, the method comprises:
OLT receives the second multicast service message from ONU, search in the multicast service pre-set is transmitted less than from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU, generate corresponding list item according to from the multicast ip address in the second multicast service message of ONU and preamble information; After removing the preamble information from the second multicast service message of ONU, learn from the multicast ip address in the second multicast service message of ONU, generate multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server; Receive the first multicast service message from multicast server, to the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to ONU corresponding from the first multicast service message of multicast server after encapsulation;
Or, forward mark according to searching the first corresponding multicast service in multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, by copy (N-1) part from the first multicast service message of multicast server; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation.
Preferably, the multicast service message encapsulation preamble information respectively copied is comprised:
Multicast service in the preamble information of N part first multicast service message is forwarded mark and be set to N number of the first multicast service forwarding mark found respectively.
Preferably, when OLT finds the list item from the multicast internet protocol IP address in the second multicast service message of ONU is corresponding in multicast service is transmitted, the method also comprises:
Corresponding for the ONU of transmission second multicast service message the second multicast service being forwarded mark is saved in during multicast service transmits;
Or the ONU of the transmission second multicast service message in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding during multicast MAC is shown, the second multicast service message from ONU is sent to multicast server.
Preferably, the first multicast service message encapsulation preamble information from multicast server is comprised:
Multicast mac address according to the first multicast service message from multicast server maps out multicast ip address, in the first multicast service is transmitted, search the list item that multicast ip address is corresponding, the ONU that the first corresponding for the ONU in the list item found multicast service forwards in the list item identifying and be set to and represent and find is asked multicast service.
Preferably, the first multicast service message from multicast server is general query message or group-specific query message, or the protocol massages of broadcasting packet or multicast frame structure; OLT before packaging preamble information time, the first multicast service in preamble information is forwarded mark be set to represent PON interface corresponding to ONU under all ONU all ask multicast service.
The invention allows for a kind of optical network unit, at least comprise:
Package module, for carrying out decapsulation to the first multicast service message from optical line terminal OLT;
Judge module, for according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then the first multicast service message is sent to user, otherwise, abandon this first multicast service message.
Preferably, package module also for:
Send to OLT to from after the second multicast service message encapsulation preamble information of user, whether preamble information at least comprises the LLID of ONU and indicates ONU to ask the second multicast service of multicast service to forward mark.
Preferably, the multicast service message from user is report report message;
Optical network unit also comprises:
Generation module, for learning the multicast internet protocol IP address in report message, generates multicast medium access control mac address forwarding table;
The second multicast service message encapsulation preamble information from user specifically comprises by package module:
The LLID of self is saved in the LLID of preamble information, and multicast service is forwarded mark and be set to and represent requesting itself multicast service.
Preferably, from the multicast service message of user for leaving message;
Optical network unit, also comprises:
Removing module, for deleting during multicast mac address is transmitted list item corresponding to the multicast ip address left in message;
The second multicast service message encapsulation preamble information from user specifically comprises by package module:
The LLID of self is saved in the LLID of preamble information, and multicast service is forwarded mark be set to represent self do not ask multicast service.
The invention allows for a kind of optical line terminal, at least comprise:
Search module, for receiving the second multicast service message from optical network unit ONU, search less than from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU in the multicast service pre-set is transmitted, the preamble information according to the second multicast service message from ONU generates corresponding list item; After removing the preamble information from the second multicast service message of ONU, by the second multicast service message repeating from ONU to multicast server;
Package module, for the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to ONU corresponding from the first multicast service message of multicast server after encapsulation; Or, forward mark according to searching the first corresponding multicast service in multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, the first multicast service message from multicast server is copied (N-1) part; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation;
Generation module, for learning from the multicast ip address in the second multicast service message of ONU, generating multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server.
Preferably, search module also for:
Find from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU in multicast service is transmitted, the second corresponding for the ONU sending multicast service message multicast service is forwarded mark and be saved in during multicast service transmits;
Or the ONU of the transmission second multicast service message in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding during multicast MAC is shown, the second multicast service message from ONU is sent to multicast server.
Preferably, package module to from multicast server first multicast service message encapsulation preamble information specifically for:
Multicast mac address according to the first multicast service message from multicast server maps out multicast ip address, in multicast service is transmitted, search the list item that multicast ip address is corresponding, the ONU that the first corresponding for the ONU in the list item found multicast service forwards in the list item being designated and representing and find is asked multicast service.
The invention allows for a kind of system of forwarding multicasting service message, at least comprise:
Optical network unit ONU, for carrying out decapsulation to the first multicast service message from optical line terminal OLT, according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then described first multicast service message is sent to user, otherwise, abandon this first multicast service message;
Optical line terminal OLT, for sending the first multicast service message to ONU.
Preferably, described ONU also for:
Send to described OLT to from after the second multicast service message encapsulation preamble information of user, whether described preamble information at least comprises the LLID of described ONU and indicates described ONU to ask the second multicast service of multicast service to forward mark;
Described OLT also for:
Receive the second multicast service message from ONU, search in the multicast service pre-set is transmitted less than from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU, generate corresponding list item according to from the multicast ip address in the second multicast service message of ONU and preamble information; After removing the preamble information from the second multicast service message of ONU, learn from the multicast ip address in the second multicast service message of ONU, generate multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server; Receive the first multicast service message from multicast server, to the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to described ONU corresponding from the first multicast service message of multicast server after encapsulation;
Or, forward mark according to searching the first corresponding multicast service in described multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, by copy (N-1) part from the first multicast service message of multicast server; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation.
Preferably, described OLT also for:
In multicast service is transmitted, find the described list item corresponding from the multicast internet protocol IP address in the second multicast service message of ONU, the second corresponding for the ONU sending described second multicast service message multicast service is forwarded mark and be saved in during multicast service transmits;
Or the ONU of the described second multicast service message of transmission in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding described in multicast MAC is shown, described the second multicast service message from ONU is sent to described multicast server.
Compared with prior art, the present invention expands lead code and forwards mark as multicast service.Pass through the solution of the present invention, the PON chip of ONU is when receiving the first multicast service message, forward mark according to the multicast service of the preamble information of the first multicast service message and judge whether reception first multicast service message, and do not need the exchange chip of ONU to judge further, thus alleviate the processing load of the user of ONU.
Accompanying drawing explanation
Be described the accompanying drawing in the embodiment of the present invention below, the accompanying drawing in embodiment is for a further understanding of the present invention, is used from explanation the present invention, does not form limiting the scope of the invention with specification one.
The networking structure schematic diagram that Fig. 1 (a) is point-to-multipoint for EPON adopts;
Fig. 1 (b) is cascade system schematic diagram inner between OLT and ONU;
Fig. 2 is existing multicast service message structure schematic diagram;
Fig. 3 is the method flow diagram being applied to the forwarding multicasting business of ONU of the present invention;
Fig. 4 is multicast service message structure schematic diagram of the present invention;
Fig. 5 is the method flow diagram being applied to the forwarding multicasting business of OLT of the present invention;
Fig. 6 is the structure composition schematic diagram of ONU of the present invention;
Fig. 7 is the structure composition schematic diagram of OLT of the present invention.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with accompanying drawing, the invention will be further described, can not be used for limiting the scope of the invention.
See Fig. 3, the present invention proposes a kind of method of forwarding multicasting business, be applied to ONU, the method arranges (as expanded after SLD) for identifying whether ONU asks the multicast service of multicast service to forward mark in the preamble information of multicast service message.
Multicast service message refers to the packet or message etc. that carry out between ONU and OLT communicating, such as report message or general query message or group-specific query message, group business stream etc.
The method comprises:
Step 300, ONU carry out decapsulation to the first multicast service message from optical line terminal OLT, according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then the first multicast service message is sent to user, otherwise, abandon this first multicast service message.
In this step, the first multicast service forwards the mark to the first multicast service message encapsulation when mark can be the request of OLT response ONU, also can be the mark of the first multicast service message encapsulation that OLT forces to send.
In this step, in the binary coding of the preseting length in the first multicast service forwarding mark, location is uniquely corresponding with ONU really; Or the whole binary coding that the first multicast service forwards the preseting length in mark is uniquely corresponding with ONU.
In this step, the first multicast service message from OLT can be group business stream or general query message or group-specific query message.
In this step, forwarding mark according to the LLID of the preamble information of the first multicast service message from OLT and the first multicast service and judge that requesting itself multicast service comprises: judging that the LLID of the preamble information of the first multicast service message from OLT is for representing multicast service (as 0X7FFF), and from the first multicast service of the preamble information of the first multicast service message of OLT forward be designated represent requesting itself multicast service (the N position that the first multicast service that the LLID as self is corresponding forwards mark be 1 or first multicast service forward mark to be set to the binary number corresponding with the LLID value of self equal, or first multicast service forward be designated complete 1), the first multicast service message from OLT is sent to user.
In this step, when according to forward from the LLID of the preamble information of the first multicast service message of OLT and the first multicast service mark judge self not ask multicast service time, abandon the first group business stream.
Wherein, forward mark according to the LLID of the preamble information of the first multicast service message from OLT and the first multicast service to judge self not ask multicast service to comprise:
The LLID judging the preamble information of the first multicast service message from OLT is for representing multicast service, and the first multicast service of preamble information forwards to be designated and represents and self do not ask multicast service.(the N position that the first multicast service that the LLID as self is corresponding forwards mark be 0 or multicast service to forward the ident value binary number corresponding with the LLID value of self unequal).
In this step, when ONU receives from the general query message of OLT or group-specific query message, decapsulation is carried out to query message, judge that the LLID of the preamble information of the query message after decapsulation represents multicast service, and the second multicast service is when forwarding at least one the ONU receiving multicast business being designated and representing PON interface corresponding to ONU, this multicast service message is sent to user.
Also comprise before the method:
Step 301, ONU send to OLT to from after the second multicast service message encapsulation preamble information of user.
In this step, whether preamble information at least comprises the LLID of ONU and indicates ONU to ask the second multicast service of multicast service to forward mark.
In this step, it is uniquely corresponding with each ONU under OLT that the second multicast service forwards mark.
In this step, the multicast service message from user can be report report message; Report message is the report message that the user of ONU receives from user, to the multicast internet protocol (IP in report message, Internet Protocol) address learns, and after generating mac address forwarding table, sends to the PON chip of ONU.
Multicast service message encapsulation preamble information from user is comprised: the LLID of self is saved in the LLID of preamble information, and the second multicast service forwarding mark of ONU is set to expression requesting itself multicast service.
Wherein, report message comprises the multicast ip address of user's program request.
Wherein, the user of ONU can adopt prior art to learn report message, the protection range be not intended to limit the present invention.
Wherein, the second multicast service forwarding mark of ONU is set to expression requesting itself multicast service to comprise:
The second corresponding for the LLID of self multicast service is forwarded the n-th position of mark for representing requesting itself multicast service; Or it is equal that the second multicast service forwarding mark is set to the binary number corresponding with the LLID of self, n is the binary number that the LLID of ONU is corresponding.
In this step, as shown in Figure 4, preamble information at least comprises the second multicast service and forwards mark and LLID, also comprises 2 bytes and CRC that SLD, SLD retain above.
Wherein, the second multicast service forwards each corresponding ONU of mark, whether asks multicast service for identifying ONU.Such as, when this position gets 0, represent that this ONU does not ask multicast service; When this position gets 1, represent that this ONU asks multicast service.
The PON interface that the figure place that second multicast service forwards mark is more than or equal to OLT for the number of ONU.Such as, in existing EPON, general corresponding 128 ONU of a PON interface of OLT, therefore, preferably, 16 bytes (totally 128) can be adopted to represent, and multicast service forwards mark, 1 byte that one of them byte retains before being before LLID.
Or the second multicast service forwarding mark adopts binary mode to identify ONU and whether asks multicast service, and the binary number that namely the second multicast service identifier is corresponding with the LLID of ONU is uniquely corresponding.Such as, as a PON interface correspondence 128 ONU of OLT, 2 bytes (totally 16) can be adopted to identify 128 ONU, when the second multicast service forwarding is designated 0000000000000001, represent that LLID is the ONU request multicast service of 1; When the second multicast service forwarding is designated 0000000000000010, represent that LLID is the ONU request multicast service of 2, by that analogy.
Wherein, report message encapsulation preamble information comprises by the PON chip of ONU:
LLID is set to self LLID by ONU, and the second multicast service is forwarded mark and be set to and represent requesting itself multicast service (if the n-th position multicast service of self correspondence being forwarded mark is 1, or adopt that the second multicast service identifier is set to the binary number corresponding with the LLID value of self is equal).Wherein, the LLID of self of ONU is distributed by OLT, specifically how to distribute and belongs to prior art, can not be used for limiting protection scope of the present invention.
In this step, the multicast service message from user can also be leave message.
The second multicast service message encapsulation preamble information from user is comprised:
The LLID of self is saved in the LLID of preamble information, and by ONU second multicast service forward mark be set to represent self do not ask multicast service.
Wherein, the second multicast service forwarding mark being set to expression self does not ask multicast service to comprise:
Multicast service self is not asked for representing in the N position the second corresponding for the LLID of self multicast service being forwarded mark; Or it is unequal that the second multicast service forwarding mark is set to the binary number corresponding with the LLID of self.
In this step, when ONU receive from user leave (igmp leave) message time, the user of ONU deletes during multicast mac address is transmitted list item corresponding to the multicast ip address left in message, and after leaving message encapsulation preamble information, will leave message and send to OLT.
Wherein, leave message and comprise multicast ip address.
Wherein, when ONU encapsulates preamble information, second multicast service forwarding mark is set to expression and self does not ask multicast service (if the N position multicast service of self correspondence being forwarded mark is 0, or the binary number that the second multicast service is forwarded ident value corresponding with the LLID value of self is unequal).
OLT receives after multicast leaves message, delete OLT multicast service transmit in should the forwarding-table item of ONU.
See Fig. 5, the present invention proposes a kind of method of forwarding multicasting business, be applied to OLT, arrange in the preamble information of multicast service message and be used for the multicast service forwarding mark that ONU identifies whether to ask multicast service, the method comprises:
Step 500, OLT receive the second multicast service message from ONU, search less than from list item corresponding to multicast ip address in the second multicast service message of ONU in the multicast service pre-set is transmitted, the preamble information according to the second multicast service message from ONU generates corresponding list item; After removing the preamble information from the second multicast service message of ONU, by the second multicast service message repeating from ONU to the user of OLT.
In this step, the second multicast service message from ONU can be report message or leave message.
In this step, multicast service is transmitted and is pre-set on OLT, the all information comprised are provided with during multicast service is transmitted when pre-setting, as shown in table 1, the second multicast service that multicast service transmits the PON interface identifier, multicast ip address and the ONU that at least comprise OLT corresponding forwards mark, preferably, also ageing time is comprised.
Table 1 multicast service is transmitted
Wherein, the PON interface of OLT is connected with the main interface of optical splitter, and the PON interface of ONU is connected with the stub interface of optical splitter, and the PON interface of each OLT is by connecting 128 ONU after optical splitter light splitting; Multicast ip address is from the multicast ip address in the multicast service message of ONU; The multicast service forwarding mark that ONU is corresponding can be the LLID of preamble information in the multicast service message from ONU.
Wherein, resource is transmitted in order to save multicast service, ensure to keep synchronous with the multicast mac address table ageing time of OLT simultaneously, ageing time can be increased in multicast service is transmitted, ageing time initial value is set to maximum M (in the multicast mac address table of M and OLT, ageing time maximum is consistent), and each second subtracts 1.After the multicast service message from ONU not receiving a certain list item as OLT within M second makes ageing time make zero, multicast service is transmitted this list item of deletion.Before ageing time zero, if receive the multicast service message from ONU corresponding to this list item, then ageing time is set to maximum M again.
Such as, the PON interface 1/1 of OLT, according to the program request situation of different ONU, generates following multicast service and transmits:
Table 2 multicast service is transmitted
In table, first PON interface of the business board of 1/1 expression OLT the 1st slot.
The multicast service of 224.1.1.2 (supposing that group business stream corresponding to this multicast group is A) according to upper table known ONU1 program request; The ONU2 program request multicast service of 224.1.1.3 (supposing that the group business stream of this correspondence is B); Any group business stream of the non-program request of other ONU outside ONU1, ONU2.OLT carries out lead code encapsulation after receiving A, B two Business Streams.
Be packaged with various ways to lead code, such as, can adopt the mode of set in the present embodiment, the 1st position of ONU1 corresponding in " multicast service the forwards mark " field in group business stream A lead code is set to 1, and other positions are 0; The 2nd of ONU2 corresponding in " multicast service forwards mark " field in group business stream B lead code is set to 1, and other positions are 0.Also can adopt binary mode, in " multicast service the forwards mark " field in group business stream A lead code, corresponding ONU1 is encapsulated as 0000000000000001; In " multicast service forwards mark " field in group business stream B lead code, corresponding ONU2 is encapsulated as 0000000000000010.
In this step, OLT finds list item corresponding to multicast ip address in multicast service is transmitted, if be report message from the second multicast service message of ONU, corresponding for the ONU of transmission second multicast service message the second multicast service being forwarded mark is saved in during multicast service transmits, and the second multicast service message from ONU is sent to multicast server, show this ONU program request multicast service, when the second multicast service issues, transmit the lead code of encapsulation group business stream according to this multicast service; If from the second multicast service message of ONU for leaving message, the ONU of the transmission second multicast service message in the list item found deletes by PON chip, and the second multicast service message from ONU is sent to the exchange chip of OLT; The exchange chip of OLT is deleted in multicast MAC table from the list item that the multicast ip address in the second multicast service message of ONU is corresponding, and the second multicast service message from ONU is sent to multicast server.
In this step, when OLT receive from ONU leave message time, OLT leaves the multicast ip address in message in being transmitted by multicast service and list item corresponding to the LLID in preamble information is deleted, list item corresponding for the multicast ip address left in multicast MAC table in message is deleted, message will be left and send to multicast server.
Step 501, OLT learn from the multicast ip address in the second multicast service message of ONU, generate mac address forwarding table, the second multicast service message from ONU is sent to multicast server; Receive the first multicast service message from multicast server, the first multicast service message is sent to OLT.
Step 502, OLT are to the first multicast service message encapsulation preamble information from multicast server, and all ONU under the PON interface sending to ONU corresponding the first multicast service message from multicast server; Or forward mark according to searching the first corresponding multicast service in multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, the first multicast service message from multicast server is copied into N part; Wherein, N is the number that the first multicast service found forwards mark; To each first multicast service message encapsulation preamble information copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation.
In this step, the first multicast service message from multicast server can be the protocol massages of group business stream or general query message or group-specific query message or broadcasting packet or multicast frame structure.
In this step, when the first multicast service forwards each corresponding ONU of mark, OLT is to the first multicast service message encapsulation preamble information from multicast server, and all ONU under the PON interface sending to ONU corresponding the first multicast service message from multicast server.Adopt this kind of mode, OLT only needs to transmit according to multicast service to encapsulate preamble information respectively to the group business stream of different multicast group, and ONU also can forward mark according to multicast service and accept or reject group business stream
When the first multicast service forwarding mark adopts binary mode to identify ONU, OLT forwards mark according to searching corresponding multicast service in multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, and first group of multicast service message from multicast server is copied (N-1) part; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation.Adopt this kind of extended mode, only need two bytes both can realize forwarding management to the multicast service of all ONU under some PON mouths, decrease the traffic overhead of lead code.Wherein, the first multicast service message encapsulation preamble information respectively copied is comprised: N part is forwarded mark from the multicast service in the preamble information of the first multicast service message of multicast server and is set to N number of the first multicast service forwarding mark found respectively.Such as, if N is 2, then the first multicast service message from multicast server is copied portion by user, add original portion two parts altogether, the first multicast service in the preamble information of a copy of it multicast service message is forwarded mark and be set to 0000000000000001 (0000000000000001 identifies for one of them multicast service found forwards), multicast service in the preamble information of another part of multicast service message is forwarded mark and be set to 0000000000000010 (0000000000000010 identifies for another multicast service found forwards).
In this step, OLT comprises the first multicast service message encapsulation preamble information from multicast server: OLT maps out multicast ip address according to the multicast mac address of the first multicast service message from multicast server, the list item that multicast ip address is corresponding is searched in multicast service is transmitted, the ONU that the first corresponding for ONU in the list item found multicast service forwards in the list item identifying and be set to and represent and find is asked multicast service, and LLID is set to expression multicast service (as being 0X7FFF).
In this step, OLT can adopt prior art to map out multicast ip address according to the multicast mac address of the first multicast service message from multicast server, can not be used for limiting protection scope of the present invention, repeat no more here.
In this step, when OLT receives general query message or group-specific query message, the general query message after encapsulation or group-specific query message, by general query message or group-specific query message encapsulation preamble information, are sent to ONU by OLT.
Wherein, OLT before packaging preamble information time, the first multicast service in preamble information is forwarded mark be set to represent PON interface corresponding to ONU under all ONU all ask multicast service.Such as, multicast service can be forwarded mark and be set to complete 1.
In this step, when OLT receives the protocol massages of broadcasting packet or multicast frame structure: the protocol massages of broadcasting packet or multicast frame structure is encapsulated preamble information by OLT, and the broadcasting packet after encapsulation or protocol massages are sent to ONU.
Wherein, OLT before packaging preamble information time, the multicast service in preamble information is forwarded mark be set to represent PON interface corresponding to ONU under all ONU all ask multicast service.
After ONU receives the protocol massages of broadcasting packet or multicast frame structure, due to the first multicast service in preamble information forward be designated represent PON interface corresponding to ONU under all ONU all ask multicast service, ONU carries out subsequent treatment according to the protocol massages of the broadcasting packet received or multicast frame structure.
See Fig. 6, the invention allows for a kind of optical network unit, at least comprise:
Package module, for carrying out decapsulation to the first multicast service message from optical line terminal OLT;
Judge module, for according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then the first multicast service message is sent to user, otherwise, abandon this first multicast service message.
In optical network unit of the present invention, package module also for:
Send to OLT to from after the second multicast service message encapsulation preamble information of user, whether preamble information at least comprises the LLID of ONU and indicates ONU to ask the second multicast service of multicast service to forward mark.
In optical network unit of the present invention, the multicast service message from user is report report message;
Optical network unit also comprises:
Generation module, for learning the multicast internet protocol IP address in report message, generates multicast medium access control mac address forwarding table;
The second multicast service message encapsulation preamble information from user specifically comprises by package module:
The LLID of self is saved in the LLID of preamble information, and multicast service is forwarded mark and be set to and represent requesting itself multicast service.
In optical network unit of the present invention, from the multicast service message of user for leaving message;
Optical network unit, also comprises:
Removing module, for deleting during multicast mac address is transmitted list item corresponding to the multicast ip address left in message;
The second multicast service message encapsulation preamble information from user specifically comprises by package module:
The LLID of self is saved in the LLID of preamble information, and multicast service is forwarded mark be set to represent self do not ask multicast service.
See Fig. 7, the invention allows for a kind of optical line terminal, at least comprise:
Search module, for receiving the second multicast service message from optical network unit ONU, search less than from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU in the multicast service pre-set is transmitted, the preamble information according to the second multicast service message from ONU generates corresponding list item; After removing the preamble information from the second multicast service message of ONU, by the second multicast service message repeating from ONU to multicast server;
Package module, for the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to ONU corresponding from the first multicast service message of multicast server after encapsulation; Or, forward mark according to searching the first corresponding multicast service in multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, the first multicast service message from multicast server is copied (N-1) part; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation;
Generation module, for learning from the multicast ip address in the second multicast service message of ONU, generating multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server.
In optical line terminal of the present invention, search module also for:
Find from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU in multicast service is transmitted, the second corresponding for the ONU sending multicast service message multicast service is forwarded mark and be saved in during multicast service transmits;
Or the ONU of the transmission second multicast service message in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding during multicast MAC is shown, the second multicast service message from ONU is sent to multicast server.
In optical line terminal of the present invention, package module to from multicast server first multicast service message encapsulation preamble information specifically for:
Multicast mac address according to the first multicast service message from multicast server maps out multicast ip address, in multicast service is transmitted, search the list item that multicast ip address is corresponding, the ONU that the first corresponding for the ONU in the list item found multicast service forwards in the list item being designated and representing and find is asked multicast service.
The invention allows for a kind of system of forwarding multicasting service message, at least comprise:
Optical network unit ONU, for carrying out decapsulation to the first multicast service message from optical line terminal OLT, according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then the first multicast service message is sent to user, otherwise, abandon this first multicast service message;
Optical line terminal OLT, for sending the first multicast service message to ONU.
In system of the present invention, ONU also for:
Send to OLT to from after the second multicast service message encapsulation preamble information of user, whether preamble information at least comprises the LLID of ONU and indicates ONU to ask the second multicast service of multicast service to forward mark;
OLT also for:
Receive the second multicast service message from ONU, search in the multicast service pre-set is transmitted less than from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU, generate corresponding list item according to from the multicast ip address in the second multicast service message of ONU and preamble information; After removing the preamble information from the second multicast service message of ONU, learn from the multicast ip address in the second multicast service message of ONU, generate multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server; Receive the first multicast service message from multicast server, to the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to ONU corresponding from the first multicast service message of multicast server after encapsulation;
Or, forward mark according to searching the first corresponding multicast service in multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, by copy (N-1) part from the first multicast service message of multicast server; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation.
In system of the present invention, OLT also for:
Find from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU in multicast service is transmitted, corresponding for the ONU of transmission second multicast service message the second multicast service is forwarded mark and be saved in during multicast service transmits;
Or the ONU of the transmission second multicast service message in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding during multicast MAC is shown, the second multicast service message from ONU is sent to multicast server.
It should be noted that; above-described embodiment is only understand for the ease of those skilled in the art; be not limited to protection scope of the present invention; under the prerequisite not departing from inventive concept of the present invention, any apparent replacement and improvement etc. that those skilled in the art make the present invention are all within protection scope of the present invention.
Claims (23)
1. a method for forwarding multicasting service message, be applied to the optical network unit ONU be arranged between user and optical line terminal OLT, it is characterized in that, the method comprises:
Described ONU carries out decapsulation to the first multicast service message from optical line terminal OLT, according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then described first multicast service message is sent to user, otherwise, abandon this first multicast service message.
2. method according to claim 1, is characterized in that, also comprises before the method:
Described ONU sends to described OLT to from after the second multicast service message encapsulation preamble information of user, and whether described preamble information at least comprises the LLID of described ONU and indicate described ONU to ask the second multicast service of multicast service to forward mark.
3. method according to claim 2, is characterized in that, it is uniquely corresponding with each ONU under described OLT that described second multicast service forwards mark.
4. method according to claim 1, is characterized in that, in the binary coding of the preseting length in described first multicast service forwarding mark, location is uniquely corresponding with described ONU really.
5. method according to claim 1, is characterized in that, the whole binary coding that described first multicast service forwards the preseting length in mark is uniquely corresponding with described ONU.
6. according to the arbitrary described method of claim 2 ~ 5, it is characterized in that, when described the second multicast service message from user is for report report message, described ONU also comprises before described report message encapsulation preamble information:
Described ONU learns the multicast internet protocol IP address in described report message, generates multicast medium access control mac address forwarding table;
Described to from user report message encapsulation preamble information comprise:
The LLID of described ONU is saved in the LLID of preamble information, and the second multicast service forwarding mark of described ONU is designated as request multicast service.
7. according to the arbitrary described method of claim 2 ~ 5, it is characterized in that, when the described multicast service message from user is for leaving message, described ONU also comprised before leaving message encapsulation preamble information:
Delete multicast mac address transmit described in leave list item corresponding to multicast ip address in message;
Described to from user leave message encapsulation preamble information comprise:
The LLID of described ONU is saved in the LLID of preamble information, and second multicast service of described ONU is forwarded mark is designated as and does not ask multicast service.
8. method according to claim 1, is characterized in that, the first multicast service message that described ONU receives from described OLT is query message.
9. a method for forwarding multicasting business, is characterized in that, be applied to the optical line terminal OLT between multicast server and optical network unit ONU, the method comprises:
OLT receives the second multicast service message from ONU, search in the multicast service pre-set is transmitted less than from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU, generate corresponding list item according to from the multicast ip address in the second multicast service message of ONU and preamble information; After removing the preamble information from the second multicast service message of ONU, learn from the multicast ip address in the second multicast service message of ONU, generate multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server; Receive the first multicast service message from multicast server, to the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to described ONU corresponding from the first multicast service message of multicast server after encapsulation;
Or, forward mark according to searching the first corresponding multicast service in described multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, by copy (N-1) part from the first multicast service message of multicast server; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation.
10. method according to claim 9, is characterized in that, the described multicast service message encapsulation preamble information to respectively copying comprises:
Multicast service in the preamble information of N part first multicast service message is forwarded mark and be set to N number of the first multicast service forwarding mark found respectively.
11. methods according to claim 9, is characterized in that, when described OLT find in multicast service is transmitted described from the list item that the multicast internet protocol IP address in the second multicast service message of ONU is corresponding time, the method also comprises:
Forward mark be saved in during multicast service transmits by sending the second multicast service corresponding to the ONU of described second multicast service message;
Or the ONU of the described second multicast service message of transmission in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding described in multicast MAC is shown, described the second multicast service message from ONU is sent to described multicast server.
12. methods according to claim 10, is characterized in that, described to from multicast server first multicast service message encapsulation preamble information comprise:
Multicast mac address according to described the first multicast service message from multicast server maps out multicast ip address, in described first multicast service is transmitted, search list item corresponding to described multicast ip address, the ONU that the first corresponding for the ONU in the list item found multicast service forwards in the list item identifying and be set to and represent and find is asked multicast service.
13. methods according to claim 9, is characterized in that, described the first multicast service message from multicast server is general query message or group-specific query message, or the protocol massages of broadcasting packet or multicast frame structure; Described OLT before packaging preamble information time, the first multicast service in described preamble information is forwarded mark be set to represent PON interface corresponding to described ONU under all ONU all ask multicast service.
14. 1 kinds of optical network units, is characterized in that, at least comprise:
Package module, for carrying out decapsulation to the first multicast service message from optical line terminal OLT;
Judge module, for according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then described first multicast service message is sent to user, otherwise, abandon this first multicast service message.
15. optical network units according to claim 14, is characterized in that, described package module also for:
Send to described OLT to from after the second multicast service message encapsulation preamble information of user, whether described preamble information at least comprises the LLID of described ONU and indicates described ONU to ask the second multicast service of multicast service to forward mark.
16. optical network units according to claim 15, is characterized in that, the described multicast service message from user is report report message;
Described optical network unit also comprises:
Generation module, for learning the multicast internet protocol IP address in described report message, generates multicast medium access control mac address forwarding table;
The second multicast service message encapsulation preamble information from user specifically comprises by described package module:
The LLID of self is saved in the LLID of described preamble information, and described multicast service forwarding mark is set to expression requesting itself multicast service.
17. optical network units according to claim 15, the described multicast service message from user is for leaving message;
Described optical network unit, also comprises:
Removing module, for deleting during multicast mac address is transmitted list item corresponding to the multicast ip address left in message;
The second multicast service message encapsulation preamble information from user specifically comprises by described package module:
The LLID of self is saved in the LLID of described preamble information, and described multicast service is forwarded mark and be set to and represent and self do not ask multicast service.
18. 1 kinds of optical line terminals, is characterized in that, at least comprise:
Search module, for receiving the second multicast service message from optical network unit ONU, search less than the described list item corresponding from the multicast internet protocol IP address in the second multicast service message of ONU in the multicast service pre-set is transmitted, the preamble information according to described the second multicast service message from ONU generates corresponding list item; After removing the described preamble information from the second multicast service message of ONU, by the second multicast service message repeating from ONU to multicast server;
Package module, for the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to described ONU corresponding from the first multicast service message of multicast server after encapsulation; Or, forward mark according to searching the first corresponding multicast service in multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, described the first multicast service message from multicast server is copied (N-1) part; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to described ONU corresponding the first multicast service message respectively copied after encapsulation;
Generation module, for learning from the multicast ip address in the second multicast service message of ONU, generating multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server.
19. optical line terminals according to claim 18, is characterized in that, described in search module also for:
In multicast service is transmitted, find the described list item corresponding from the multicast internet protocol IP address in the second multicast service message of ONU, the second corresponding for the ONU sending described multicast service message multicast service is forwarded mark and be saved in during multicast service transmits;
Or the ONU of the described second multicast service message of transmission in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding described in multicast MAC is shown, described the second multicast service message from ONU is sent to described multicast server.
20. optical line terminals according to claim 18, is characterized in that, described package module to from multicast server first multicast service message encapsulation preamble information specifically for:
Multicast mac address according to described the first multicast service message from multicast server maps out multicast ip address, in described multicast service is transmitted, search list item corresponding to described multicast ip address, the ONU that the first corresponding for the ONU in the list item found multicast service forwards in the list item being designated and representing and find is asked multicast service.
The system of 21. 1 kinds of forwarding multicasting service messages, is characterized in that, at least comprises:
Optical network unit ONU, for carrying out decapsulation to the first multicast service message from optical line terminal OLT, according to the LLID LLID of its preamble information with whether allow the first multicast service of reception first multicast service to forward mark to judge, receive if allow, then described first multicast service message is sent to user, otherwise, abandon this first multicast service message;
Optical line terminal OLT, for sending the first multicast service message to ONU.
22. systems according to claim 21, is characterized in that, described ONU also for:
Send to described OLT to from after the second multicast service message encapsulation preamble information of user, whether described preamble information at least comprises the LLID of described ONU and indicates described ONU to ask the second multicast service of multicast service to forward mark;
Described OLT also for:
Receive the second multicast service message from ONU, search in the multicast service pre-set is transmitted less than from list item corresponding to the multicast internet protocol IP address in the second multicast service message of ONU, generate corresponding list item according to from the multicast ip address in the second multicast service message of ONU and preamble information; After removing the preamble information from the second multicast service message of ONU, learn from the multicast ip address in the second multicast service message of ONU, generate multicast medium access control mac address forwarding table, the second multicast service message from ONU is sent to multicast server; Receive the first multicast service message from multicast server, to the first multicast service message encapsulation preamble information from multicast server, and by all ONU under the PON interface sending to described ONU corresponding from the first multicast service message of multicast server after encapsulation;
Or, forward mark according to searching the first corresponding multicast service in described multicast service is transmitted from the multicast ip address in the first multicast service message of multicast server, by copy (N-1) part from the first multicast service message of multicast server; Wherein, N is the number that the first multicast service found forwards mark; To the first multicast service message encapsulation preamble information respectively copied, all ONU under the PON interface send to ONU corresponding the first multicast service message respectively copied after encapsulation.
23. systems according to claim 22, is characterized in that, described OLT also for:
In multicast service is transmitted, find the described list item corresponding from the multicast internet protocol IP address in the second multicast service message of ONU, the second corresponding for the ONU sending described second multicast service message multicast service is forwarded mark and be saved in during multicast service transmits;
Or the ONU of the described second multicast service message of transmission in the list item found is deleted, and delete from the list item that the multicast ip address in the second multicast service message of ONU is corresponding described in multicast MAC is shown, described the second multicast service message from ONU is sent to described multicast server.
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