CN101808256B - Passive optical network system with multicast authentication and control functions and implementing method thereof - Google Patents

Passive optical network system with multicast authentication and control functions and implementing method thereof Download PDF

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CN101808256B
CN101808256B CN2010101459666A CN201010145966A CN101808256B CN 101808256 B CN101808256 B CN 101808256B CN 2010101459666 A CN2010101459666 A CN 2010101459666A CN 201010145966 A CN201010145966 A CN 201010145966A CN 101808256 B CN101808256 B CN 101808256B
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multicast
message
port
service terminal
onu
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CN101808256A (en
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肜云
王莉
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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Abstract

The invention discloses a passive optical network system with multicast authentication and control functions and an implementing method thereof. In the method, an ONU monitors the interaction between a multicast service terminal and a BRAS to acquire a user name and multicast authority of the multicast service terminal; and a multicast forwarding table is set on the basis; multicast messages are filtered according to the multicast forwarding table; and an OLT bypasses all multicast messages and processes the multicast messages on a master control panel by adopting a multicast protocol, so that the multicast user authentication and control of the passive optical network system are realized.

Description

Passive optical network and its implementation with multicast authentication and controlled function
Technical field
The present invention relates to passive optical network, be specifically related to have passive optical network and its implementation of multicast authentication and controlled function.
Background technology
BRAS (Broadband Remote Access Server, broad band remote access service equipment).
Along with the fast development of the communication technology, the broadband access network business becomes the most noticeable business in the telecommunication service.In numerous broadband access network business, multicast (Multicast) business is particularly important.The emerging broadband services that with the multicast is representative all needs bigger bandwidth, less forwarding time delay, and this has just proposed higher and faster demand to existing communication network.Since early stage for the greatly developing of backbone transport networks, Access Network becomes the bottleneck of whole communication network.Existing access technology comprises that digital subscriber line (DigitalSubscriber Line is called for short DSL) inserts and Ethernet inserts; Because the access speed of DSL circuit is along with the increase of distance descends very fast; When broadband services surpasses access speed, for business carry out the very big obstacle of formation, and insert for Ethernet; Because the distance of Ethernet switch is shorter, coverage receives very big restriction.In order to solve the bottleneck problem of Access Network, press for new access technology.
Along with the development of optical transport technology, EPON (Passive Optical Network is called for short PON) technology is applied in the access technology gradually, and this technology mainly contains following several kinds of characteristics:
1. the structure of point-to-multipoint
2. descending employing broadcast mode
3. high bandwidth
As a kind of new access technology, the bandwidth that it provided can adapt to now and in 10 years in the future the user to the demand of bandwidth.This technology both can have been used the ONU of SFU type, also can use simultaneously the ONU of MDU type, original DSL subscriber's cable also can through with original access device as a node connecting system, thereby existing twisted-pair feeder resource is fully utilized.EPON can solve the present network bottleneck problem of Access Network, is the direction of access technology development.
In passive optical network technique, its down direction is broadcasted, and this is very favorable for the developing multicast business.In present multicast implementation, set up special multicast transmission passage to ONU (Optical Network Unit, optical network unit are called for short ONU) from OLT (Optical Line Terminal, optical line terminal are called for short OLT).OLT obtains the group broadcasting program that the user asks through analyzing the multicast protocol message from user side.The multicast data flow that OLT gets access to oneself is sent to each descending PON light mouth.ONU receives after the multicast data flow, and it is forwarded to the corresponding registered permanent residence of using, and realizes multicast service.
In present multicast scheme, the authentication of multicast and control become a problem demanding prompt solution, and this is that traditional multicast protocol does not have the authentification of user function because multicast authentication is difficult, and the user can arbitrarily add and leave; Service billing is difficult, and multicast protocol does not relate to the charging problem, and operator can't learn when the user adds and when leave, and how many users also can't add up certain time has watching group broadcasting program on earth, can't accurate billing.Adding the multicast user is point-to-multipoint; After the multi-cast business data of an authenticated issues; Unauthorized user only need send with the corresponding multicast protocol message of this multi-cast business data can directly accept this multicast service at lower floor's access device, has very big potential safety hazard.Just because of above-mentioned reason; The a large amount of multicast authentication control methods that adopt of operator are through BRAS (Broadband Remote AccessServer; BAS Broadband Access Server) adopt PPPOE to carry out authentication, this method has solved the problem that authentification of user disperses very much, is actually the transmission of use mode of unicast but begin multicast service in the Access Network side; The advantage that the multicast mode is saved bandwidth can't obtain performance, the bottleneck problem of also having aggravated Access Network simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to solve the problem that present passive optical network access equipment is realized multicast authentication and control difficulty.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopted provides the method that a kind of passive optical network is realized multicast authentication and control, may further comprise the steps:
Message is inserted to the BRAS request of sending respectively in A, each multicast service terminal; This request inserts the username and password that includes the multicast service terminal in the message; BRAS receives after above-mentioned request inserts message to verify respectively whether the username and password at each multicast service terminal is correct, and is correct like username and password, then replys acknowledgement frame to this multicast service terminal; And issue electric program menu with acknowledgement frame; The multicast authority that promptly includes multicast group IP address list and this multicast service terminal in this acknowledgement frame, a program channel in the corresponding electric program menu in each the IP address in the said multicast group IP address list is used for accepting in view of the above the program stream of this channel; Incorrect like username and password, then abandon this request and insert message, do not do any response;
B, ONU intercept multicast service terminal and the interactive information of BRAS on each multicast port; Obtain the user name and the multicast authority at the multicast service terminal on this multicast port based on above-mentioned interactive information, and delegate power based on above-mentioned user name and multicast and to limit the multicast authority template that each multicast port is set;
The type of message that C, ONU receive according to each multicast port is safeguarded multicast forward table through IGMP Snooping agreement, and the different messages of receiving are handled respectively, and the list item of said multicast forward table comprises multicast port, multicast address and M-VLAN;
D, OLT main control unit adopt IGMP proxy multicast protocol that multicast message is handled, promptly through safeguarding that multicast forward table duplicates multi-cast business data and distributes;
E, BRAS step by step deliver to each multicast service terminal according to multicast forward table through OLT and ONU with multi-cast business data.
In the said method, step C may further comprise the steps:
If ONU receives is the multicast that sends at the multicast service terminal message that joins request; Whether the authority of then verifying this multicast service terminal satisfies the authority of setting in the multicast authority template; If satisfy; Then in the multicast forward table of ONU, increase a list item; Multicast port is to receive the join request port of message of multicast; Multicast address is this multicast MAC Address after the entrained multicast group IP address spaces of message that joins request; M-VLAN is the M-VLAN that office's square gauge is drawn, and this multicast is joined request message transmission to the OLT ply-yarn drill; If do not satisfy, then abandon this multicast message that joins request;
If what ONU received is the leave message that send at the multicast service terminal, then in current multicast forward table, search the multicast list of corresponding port, if find this list item, then open a last membership query timer of group immediately, then upwards transmit this leave message.Asking joins message responds if timer expiry, this multicast port do not have, then the list item at this multicast port place of deletion in multicast forward table; Join message if receive the request of this multicast port before overtime, the list item that then this multicast port is not belonged to carries out any operation;
When ONU receive be the query message of OLT the time, then it is forwarded to all multicast port of this ONU.
The present invention also provides a kind of passive optical network with multicast authentication and controlled function; Comprise BRAS, OLT, some ONU and be connected the some multicast services terminal on each ONU; Said BRAS; Be used for verifying whether the username and password of each multicast service terminal access request message is correct; Reply acknowledgement frame through the back to this multicast service terminal in checking, and issue electric program menu, promptly include the multicast group IP address list in the acknowledgement frame and this needed multicast parameters in multicast service terminal is provided with information with acknowledgement frame; Wherein, A program channel in the corresponding electric program menu in each IP address in the multicast group IP address list can be accepted the program stream of this program channel in view of the above, and multicast parameters is provided with information and comprises the correspondence table of program channel and multicast group IP address list and the multicast authority at this multicast service terminal;
Said ONU is provided with and intercepts module, IGMP Snooping module and message processing module (MPM); Intercept module and intercept multicast service terminal and the interactive information of BRAS on its each port; Obtain user name and the multicast authority of each multicast service terminal on this port according to above-mentioned interactive information, and the multicast authority template of each user port is set according to above-mentioned user name and multicast authority; IGMP Snooping module is provided with, safeguards a multicast forward table; And transmit data to OLT with each multicast service terminal according to multicast forward table according to the type of message of receiving, the list item of said multicast forward table comprises multicast port, multicast address and M-VLAN; Message processing module (MPM) calls according to each port type of message of receiving that IGMP Snooping resume module multicast joins message, leave message, and the query message of OLT is forwarded to all multicast port of this ONU;
Said OLT is provided with IGMP proxy module, and this IGMP proxy module is duplicated data according to multicast forward table the message of receiving and distributed.
The present invention; On the OLT of passive optical network, move igmp proxy; On the ONU of EPON, move IGMP snooping and multicast template filtering function module then; So this system had both possessed the agency and the convergence capabilities of multicast agent, also have simultaneously and intercept and high performance characteristics such as transparent transmission, and realized the multicast authentication and the controlled function of system.
Description of drawings
Fig. 1 is a kind of embodiment sketch map with passive optical network of multicast authentication and controlled function provided by the invention;
Fig. 2 is the another kind of embodiment sketch map with passive optical network of multicast authentication and controlled function provided by the invention;
Fig. 3 realizes the method flow diagram of multicast authentication and control for passive optical network access equipment of the present invention.
Embodiment
The object of the present invention is to provide a kind of passive optical network to realize multicast authentication and the method for control and the passive optical network that uses this method; So that make full use of the passive optical network bandwidth in actual use; Be that example is explained with two multicast service terminals below, for a plurality of multicast services terminal, its implementation is identical; In the entire process flow process, the regulation of multicast protocol relevant criterion is followed in the processing strictness of all multicast protocol messages.
Fig. 3 is the flow chart that passive optical network provided by the invention is realized multicast authentication and control method; In this flow process; Multicast service terminal 1 is through authorizing the mutual of developing multicast business, and fail through authorizing, therefore at multicast service terminal 2; The multicast protocol message that send at multicast service terminal 2 is tackled by ONU, and detailed step is following:
A, multicast service terminal 1 (IP:192.168.0.101) and multicast service terminal 2 (IP:192.168.0.102) initiate the PPPoE request to BRAS (IP:192.168.0.1) respectively; Include the username and password at multicast service terminal separately in the PPPoE request separately; BRAS receives after above-mentioned PPPoE request inserts message to verify respectively whether the username and password at each multicast service terminal is correct, and is correct like username and password, then replys the PPPoE acknowledgement frame to this multicast service terminal; And issue electric program menu with this PPPoE acknowledgement frame; Be to include the multicast group IP address list in the PPPoE acknowledgement frame and this needed multicast parameters in multicast service terminal is provided with information, wherein, a program channel in the corresponding electric program menu in each the IP address in the multicast group IP address list; Can accept the program stream of this program channel in view of the above; Multicast parameters is provided with correspondence table and the multicast authority that information comprises program channel and multicast group IP address list, and is incorrect like the username and password at multicast service terminal, then abandons this message; And this multicast service terminal is set for forbidding the user, stop on its multicast message and send.Include channel CCTV-1 in the multicast group IP address list that multicast service terminal 1 gets access to through the PPPoE acknowledgement frame in this example, the multicast group address of CCTV-1 is 225.1.1.1, and the multicast authority at multicast service terminal 1 is for allowing visit CCTV-1 channel; Do not have program channel CCTV-1 in the multicast group IP address list that multicast service terminal 2 gets access to through the PPPoE acknowledgement frame, the multicast group address of CCTV-1 is 225.1.1.1, and the multicast authority at multicast service terminal 2 is not for allowing to visit the CCTV-1 channel.B, ONU intercept the PPPoE interactive information of multicast service terminal 1 and multicast service terminal 2 and BRAS on its port; Obtain the user name and the multicast authority at the multicast service terminal on this port based on the PPPoE interactive information, and delegate power based on above-mentioned user name and multicast and to limit the multicast authority template that each multicast port is set;
C, ONU handle respectively according to the type of message that each port is received.
When the multicast that receives multicast service terminal 1 when the port at place, multicast service terminal 1 joins request message; Whether the multicast authority of verifying this multicast service terminal satisfies the authority of setting in the multicast authority template, because the multicast authority at multicast service terminal 1 is for allowing visit CCTV-1 channel, therefore; In the multicast forward table of ONU, increase a list item; Multicast port is the port that the request of receiving joins message, and multicast address is the MAC Address after the multicast group IP address spaces of asking to join message entrained, and concrete conversion gets final product with reference to the MAC mapping relations of ICP/IP protocol D class address; Can check ICP/IP protocol; No longer detail here, the M-VLAN that M-VLAN is drawn for office's square gauge, and this request joined message be transparent to the OLT ply-yarn drill; When the multicast that the port at place, multicast service terminal 2 receives multicast service terminal 2 joins request message; Whether the multicast authority of verifying this multicast service terminal satisfies the authority of setting in the multicast authority template; Because the multicast authority at multicast service terminal 2 is not for allowing to visit the CCTV-1 channel, therefore, it haves no right to watch this program the ONU checking; The multicast that abandons multicast service terminal 2 message that joins request, and on send multicast service terminal 2 to add the information of failure.
When the port at 1 place, multicast service terminal receives the leave message of sending at multicast service terminal 1; In current multicast forward table, search the multicast list of corresponding port,, then open a last membership query timer of group immediately if find this list item; Wait for the group ad hoc inquiry that the OLT main control unit sends; Asking joins message responds if timer expiry, this multicast port do not have, then the list item at this multicast port place of deletion in multicast forward table; Join message if receive the request of this multicast port before overtime, the list item that then this multicast port is not belonged to carries out any operation, simultaneously this leave message is transparent to the OLT ply-yarn drill;
If ONU receives when being the query message of OLT, then it is forwarded to all multicast port of this ONU.
D, OLT main control unit adopt IGMP proxy multicast protocol that multicast message is handled, and promptly through safeguarding that multicast address is transmitted data are duplicated and are distributed, and the list item that this multicast address is transmitted comprises multicast port, multicast address and M-VLAN;
E, BRAS, to multicast server request corresponding business stream and issue according to the multicast member message of receiving; Group business stream is transmitted passage along setting up good multicast address, through OLT, ONU, delivers to the multicast service terminal step by step.In this example, final multicast service terminal 1 has received the group business stream of CCTV-1.
According to above analysis, adopt said method, passive optical network just can be passed to user terminal 1 with multicast service, and stops user 2 to use multicast service.
In the said method, ONU and OLT all have member's aging mechanism, do not receive above ageing time when certain port to join message, with the deletion from multicast address is transmitted of this port.The module of operation igmp proxy also has member's aging mechanism on the main control unit, do not receive and join message when certain port surpasses ageing time, with this port from the multicast address list deletion.
The passive optical network with multicast authentication and controlled function that the present invention also provides has two kinds of embodiment, and Fig. 1 is first kind of embodiment sketch map of this system.Among this embodiment, the type of ONU is SFU (Single Family Unit, the household unit of living alone; Be called for short SFU) type ONU; Each multicast service terminal is monopolized an ONU and is commenced business, and at this moment, ONU intercepts mutual between this multicast service terminal and the BRAS; The multicast template rights at this multicast service terminal is set, thereby the multicast service at this multicast service terminal is managed and controlled.
Fig. 2 is the another kind of embodiment sketch map with passive optical network of multicast authentication and controlled function.ONU type in this system is MDU (Multi.Dwelling Unit, multitenant unit are called for short MDU) type ONU; From concrete realization, can be DSL type ONU, also can be LAN type ONU; Have a plurality of multicast services terminal under the ONU this moment; ONU intercepts mutual between each multicast service terminal and the BRAS, for each multicast service terminal is provided with the multicast authority template, thereby realizes management and the control to multicast service.
In conjunction with Fig. 1 and Fig. 2, the passive optical network with multicast authentication and controlled function comprises BRAS, OLT, some ONU and is connected the some service terminals on each ONU.Whether the username and password that each multicast service terminal of BRAS checking is inserted in the request message is correct; Reply acknowledgement frame through the back to this multicast service terminal in checking; And issue electric program menu with acknowledgement frame; Be to include the multicast group IP address list in the acknowledgement frame and this needed multicast parameters in multicast service terminal is provided with information, wherein, a program channel in the corresponding electric program menu in each the IP address in the multicast group IP address list; Can accept the program stream of this program channel in view of the above, multicast parameters is provided with information and comprises the correspondence table of program channel and multicast group IP address list and the multicast authority at this multicast service terminal.ONU is provided with and intercepts module, IGMPSnooping module and message processing module (MPM); Intercept module and intercept multicast service terminal and the interactive information of BRAS on its each port; Obtain user name and the multicast authority of each multicast service terminal on this port according to above-mentioned interactive information, and delegate power according to above-mentioned user name and multicast and to limit the multicast authority template that each port is set; The setting of IGMP Snooping module, multicast address of maintenance are transmitted, and transmit to OLT and each multicast service terminal forwarding data according to multicast address, and the list item that said multicast address is transmitted comprises multicast port, multicast address and M-VLAN.Message processing module (MPM) is handled respectively based on each port type of message of receiving as follows:
When the multicast that receives this multicast service terminal when the ONU port at multicast service terminal place joins request message; Whether the multicast authority of verifying this multicast service terminal satisfies the authority of setting in the multicast authority template; When the multicast authority at multicast service terminal is permission; Calling IGMP Snooping module increases a list item in the multicast address of ONU is transmitted, multicast port is the port that the request of receiving joins message, and multicast address is the MAC Address after the multicast group IP address spaces of asking to join message entrained; M-VLAN is office's M-VLAN of drawing of square gauge, and this request joined message is transparent to the OLT ply-yarn drill; When the multicast authority at multicast service terminal when not allowing to visit, the multicast that then abandons the multicast service terminal message that joins request, and on give this multicast service terminal to add the information of failure.
When the ONU port at place, multicast service terminal receives the leave message of sending at this multicast service terminal; Call IGMP Snooping module and in current multicast addresses forwarding table, search the multicast list of corresponding port; If find this list item; Then open a last membership query timer of group immediately, wait for the group ad hoc inquiry that the OLT main control unit sends, if timer expiry; This multicast port does not have request and joins message and respond, the list item that then this multicast port of deletion belongs in multicast address is transmitted; Join message if receive the request of this multicast port before overtime, the list item that then this multicast port is not belonged to carries out any operation, simultaneously this leave message is transparent to the OLT ply-yarn drill;
When receive be the query message of OLT the time, then it is forwarded to all multicast port of this ONU.
OLT is provided with IGMP proxy module, and this IGMP proxy module is transmitted according to multicast address the message received data are duplicated and distributed.
Also can adopt the DHCP agreement to realize the mutual of multicast service terminal and BRAS among the present invention, concrete implementation method and foregoing description are similar, repeat no more.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn that the simple structure of under enlightenment of the present invention, making changes or modification, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.

Claims (2)

1. passive optical network is realized the method for multicast authentication and control, it is characterized in that may further comprise the steps:
The multicast message that joins request is sent to broad band remote access service equipment B RAS respectively in A, each multicast service terminal; This multicast joins request and includes the username and password at multicast service terminal in the message; BRAS receives that above-mentioned multicast joins request and verifies respectively whether the username and password at each multicast service terminal is correct behind the message; Correct like username and password; Then reply acknowledgement frame, and issue electric program menu, promptly include the multicast authority at multicast group IP address list and this multicast service terminal in this acknowledgement frame with acknowledgement frame to this multicast service terminal; A program channel in the corresponding electric program menu in each IP address in the said multicast group IP address list is used for receiving in view of the above the program stream of this channel; Incorrect like username and password, then abandon this message, and this multicast service terminal is set for forbidding the multicast service terminal, stop on its multicast message and send;
B, ONU intercept multicast service terminal and the interactive information of BRAS on each multicast port; Obtain the user name and the multicast authority at the multicast service terminal on this multicast port based on above-mentioned interactive information, and the multicast authority template of each multicast port is set based on above-mentioned user name and multicast authority;
The type of message that C, ONU receive according to each multicast port is safeguarded multicast forward table through IGMP Snooping agreement, and the different messages of receiving are handled respectively, and the list item of said multicast forward table comprises multicast port, multicast address and M-VLAN;
D, OLT main control unit adopt IGMP proxy multicast protocol that multicast message is handled, promptly through safeguarding that multicast forward table duplicates multi-cast business data and distributes;
E, BRAS step by step deliver to each multicast service terminal according to multicast forward table through OLT and ONU with multi-cast business data;
In step C:
If ONU receives is the multicast that sends at the multicast service terminal message that joins request; Whether the authority of then verifying this multicast service terminal satisfies the authority of setting in the multicast authority template; If satisfy; Then in the multicast forward table of ONU, increase a list item; Multicast port is to receive the join request port of message of multicast; Multicast address is this multicast MAC Address after the entrained multicast group IP address spaces of message that joins request; M-VLAN is the M-VLAN that office's square gauge is drawn, and this multicast is joined request message transmission to the OLT ply-yarn drill; If do not satisfy, then abandon this multicast message that joins request;
If what ONU received is the leave message that send at the multicast service terminal; Then in current multicast forward table, search the multicast list of corresponding port,, then open a last membership query timer of group immediately if find this list item; Wait for the group ad hoc inquiry that the OLT main control unit sends; The message that joins request does not respond if timer expiry, this multicast port have multicast, then the list item at this multicast port place of deletion in multicast forward table; If receive the multicast of this multicast port message that joins request before overtime, then the list item at this multicast port place is not carried out any operation, simultaneously this leave message is transparent to the OLT ply-yarn drill;
When ONU receive be the query message of OLT the time, then it is forwarded to all multicast port of this ONU.
2. the passive optical network that has multicast authentication and controlled function comprises broad band remote access service equipment B RAS, OLT, some ONU and is connected the some multicast services terminal on each ONU, it is characterized in that,
Said BRAS; Whether the join request username and password of message of the multicast that is used for verifying each multicast service terminal is correct; Reply acknowledgement frame through the back to this multicast service terminal in checking; And issue electric program menu with acknowledgement frame; Be to include the multicast group IP address list in the acknowledgement frame and this needed multicast parameters in multicast service terminal is provided with information, wherein, a program channel in the corresponding electric program menu in each the IP address in the multicast group IP address list; Can receive the program stream of this program channel in view of the above, multicast parameters is provided with information and comprises the correspondence table of program channel and multicast group IP address list and the multicast authority at this multicast service terminal;
Said ONU is provided with and intercepts module, IGMP Snooping module and message processing module (MPM); Intercept module and intercept multicast service terminal and the interactive information of BRAS on its each port; Obtain user name and the multicast authority of each multicast service terminal on this port according to above-mentioned interactive information, and the multicast authority template of each port is set according to above-mentioned user name and multicast authority; IGMP Snooping module is provided with, safeguards a multicast forward table; And transmit data to OLT with each multicast service terminal according to multicast forward table according to the type of message of receiving, the list item of said multicast forward table comprises multicast port, multicast address and M-VLAN; Message processing module (MPM) is called IGMP Snooping resume module multicast join request message, leave message according to each port type of message of receiving, the query message of OLT is forwarded to all multicast port of this ONU;
Said OLT is provided with IGMP proxy module, and this IGMP proxy module is duplicated data according to multicast forward table the message of receiving and distributed;
If ONU receives is the multicast that sends at the multicast service terminal message that joins request; Whether the authority of then verifying this multicast service terminal satisfies the authority of setting in the multicast authority template; If satisfy; Then in the multicast forward table of ONU, increase a list item; Multicast port is to receive the join request port of message of multicast; Multicast address is this multicast MAC Address after the entrained multicast group IP address spaces of message that joins request; M-VLAN is the M-VLAN that office's square gauge is drawn, and this multicast is joined request message transmission to the OLT ply-yarn drill; If do not satisfy, then abandon this multicast message that joins request;
If what ONU received is the leave message that send at the multicast service terminal; Then in current multicast forward table, search the multicast list of corresponding port,, then open a last membership query timer of group immediately if find this list item; Wait for the group ad hoc inquiry that the OLT main control unit sends; The message that joins request does not respond if timer expiry, this multicast port have multicast, then the list item at this multicast port place of deletion in multicast forward table; If receive the multicast of this multicast port message that joins request before overtime, then the list item at this multicast port place is not carried out any operation, simultaneously this leave message is transparent to the OLT ply-yarn drill;
When ONU receive be the query message of OLT the time, then it is forwarded to all multicast port of this ONU.
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