CN101951342B - Multicast data stream propagation method, propagation device and network equipment - Google Patents
Multicast data stream propagation method, propagation device and network equipment Download PDFInfo
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Abstract
The invention discloses a multicast data stream propagation method, propagation device and network equipment. The method comprises the following steps: an export PE receiving multicast data streams judges that the flow load of useless multicast data streams received by the export PE excesses a set threshold, and then determines the entry PE corresponding to at least one multicast data stream requiring to switch the propagation mode in the useless multicast data streams and each multicast data stream requiring to switch the propagation mode; and the export PE sends a notification to the determined entry PE, wherein the notification is used for indicating the propagation mode of the multicast data stream which corresponds to the entry PE and requires to switch the propagation mode from a Default-MDT mode to a Data-MDT mode. In the invention, the export PE notifies that one or more of useless multicast data streams of the entry PE need to switch to the Data-MDT mode according to the flow load of the multicast data streams of the entry PE, thus saving the bandwidth of public network connected with the export PE and the export PE processing resources.
Description
Technical field
The present invention relates to the multicasting virtual private network field, relate in particular to a kind of transmission method, device and network equipment of multicast traffic stream.
Background technology
Virtual Private Network (Virtual Private Network, VPN) refers to provide dedicated communication link in common network for the user, and these dedicated communication links need not to set up special-purpose physical link and realize, therefore claim that it is Virtual Private Network.
VPN (is called for short provider edge equipment by the edge device of service provider network, ProviderEdge, PE), the edge device of the core router (Provider, P) of service provider network, user network (Customer Edge, CE) forms.PE links to each other with CE, and it is put into the upper user network data that arrive of CE on the public network and propagates (PE that realizes this function is called entry PE); And it also propagates into (PE that realizes this function calls outlet PE) in the user network to the message that carries the user network data by CE again from public network.P equipment is connected with PE or P, and it is responsible for propagating the data of public network.CE equipment is connected with PE, and it is the network interface that user network is linked into public network.A PE can link to each other with many CE, so PE can be a plurality of VPN propagation datas.And the upper interior data of each VPN of must strictly distinguishing of PE make its mutual isolation, can not allow data enter into other VPN of therewith VPN traffic from a VPN, thereby guarantee the communication security of user network.
The IP multicast is a kind of technology that single-point sends the data efficient forwarding problems under the multipoint reception communication pattern that solves, its core content is, when the sender sends data to one group of recipient, the group address of data with a reservation to be sent, only have the recipient who adds this multicast group just can receive multicast packet, other user on the network can not receive this piece of data.
Multicasting VPN technology for multicasting technology and VPN technologies combination, prior art provides multiple implementation, wherein popular is multicast domain (Multicast Domain, MD) scheme, and it is by safeguarding that for each VPN a multicast domain realizes in service provider network.Each multicast domain has an acquiescence multicast distribution tree (Default Multicast Distribution Tree, Default-MDT) to be used for all PE in the link field.By this Default-MDT, user network can be regarded multicast domain as a local area network (LAN) (LAN), the multicast packet that is to say CE propagates into after the entry PE, these data will be on public network be transmitted to all outlet ports PE this multicast domain, and this multicast packet is to propagate at Default-MDT in the mode of multicast at public network.Whether outlet PE will be according to there being multicast receivers to determine whether will transmit these multicast packets in the VPN website that connects, if there is not the recipient in the website, then as long as multicast packet is abandoned.In this scheme, the propagation of multicast packet in public network is not optimum mode, do not need on the outlet PE of these multicast packets because data can arrive some, and the processing to multicast packet on these PE just abandons.Like this, just caused the waste of public-network bandwidth, also wasted the resource of outlet PE simultaneously and processed these useless multicast packets.
Prior art has proposed a kind of mode of optimization to above-mentioned multicast domain scheme, that is: when the speed of the multicast traffic stream of certain user network when entry PE arrives certain threshold value, for the newly-built multicast distribution tree that is different from Default-MDT of this multicast traffic stream, be called data multicast distribution tree (Data-MDT).When entry PE is prepared a newly-built Data-MDT, it sends a data multicast distribution tree by Default-MDT first and adds (MDT-Join) message, wherein carried source address (C-S), the group address (C-G) of user multicast data flow, group address (P-G) information when public network is propagated of user multicast data flow, the multicast data flow of expression C-S, C-G sign will be propagated along the Data-MDT of P-G sign.Outlet PE is received after the MDT-Join message, only have and just can join among the Data-MDT when this multicast traffic stream had demand, therefore multicast traffic stream will arrive those along Data-MDT has on the outlet PE of demand multicast data flow, thereby has saved the resource of multicast traffic stream without the outlet PE of demand.
But there is following problem in technique scheme: because entry PE can be disperseed, when flow threshold that each entry PE arranges less than corresponding entry PE based on the flow of the multicast traffic stream of Default-MDT transmission, still cause the bandwidth waste of the public network that outlet PE connects that does not need these multicast data flows, also wasted the resource of outlet PE simultaneously and processed these useless data.
Describe with example shown in Figure 1, among Fig. 1, CE1 links to each other with the edge device PE1 of provider network, and CE2 links to each other with PE1, and CE3 links to each other with PE3, and CE4 links to each other with PE4.The user S1 that belongs to VPN A that CE1 connects has sent private network multicast traffic stream (192.1.1.1,233.3.3.3) to CE1, and the user S2 that belongs to VPNA that CE2 connects sends private network multicast traffic stream (192.2.2.2,234.4.4.4) to CE2.
The recipient R1 that CE3 connects has demand to multicast traffic stream (192.1.1.1,233.3.3.3) and (192.2.2.2,234.4.4.4); But the R2 that CE4 connects does not all have demand to multicast traffic stream (192.1.1.1,233.3.3.3) and (192.2.2.2,234.4.4.4).
Suppose that the flow threshold that PE1 arranges is 5M, PE1 receives that speed is the VPNA multicast traffic stream (192.1.1.1 of 4M, 233.3.3.3), because the flow threshold less than entry PE 1 setting, so entry PE 1 uses group address 239.1.1.1 as the group address of Default-MDT, therefore the multicast traffic stream (192.1.1.1,233.3.3.3) of VPN A is after the PE1 conversion, and the multicast traffic stream that becomes destination address and be 239.1.1.1 is propagated at public network.
Equally, the flow threshold that PE2 arranges is 5M, if it is the multicast traffic stream (192.2.2.2 of the VPN A of 4M that PE2 receives speed, 234.4.4.4), because the flow threshold that this multicast traffic stream arranges less than entry PE 2, so use group address 239.1.1.1 as the group address of Default-MDT, the multicast traffic stream (192.2.2.2 of VPN A, 234.4.4.4) after PE2 conversion, the multicast traffic stream that also becomes destination address and be 239.1.1.1 is propagated at public network.
Although (PE1 and PE2) is provided with threshold value in each entry PE, the website at CE4 place need not receiving multicast data stream, but still there is the useless multicast traffic stream of 8M to arrive outlet PE 4 from P, cause the bandwidth waste of public network that PE4 connects, also wasted the resource of outlet PE 4 simultaneously and processed these useless multicast packets.
Summary of the invention
The embodiment of the invention provides a kind of transmission method, device and network equipment of multicast traffic stream, in the multicast domain scheme that solves existing multicasting VPN, multicast traffic stream is because the flow threshold that does not reach entry PE adopts Default-MDT to propagate the public-network bandwidth that outlet PE connects that does not need this multicast traffic stream that multicast traffic stream causes and the problem of the outlet PE processing wasting of resources.
The transmission method of the multicast traffic stream that the embodiment of the invention provides comprises:
The outlet provider edge equipment PE of receiving multicast data stream judges when the flow load of the useless multicast traffic stream of its reception surpasses the threshold value of setting, and determines that at least one need to switch multicast traffic stream and the corresponding entry PE thereof of circulation way in the described useless multicast traffic stream;
Described outlet PE sends notice message to the described entry PE of determining; Described notice message is used to indicate the described circulation way of the multicast traffic stream of switching circulation way that needs corresponding to this entry PE and switches to data multicast distribution tree mode by acquiescence multicast distribution tree mode.
The transmission device of the multicast traffic stream that the embodiment of the invention provides comprises:
Judge module is used for judging whether the flow load of the useless multicast traffic stream that receives surpasses the threshold value of setting;
Determination module, be used in described judge module judged result determining that at least one need to switch multicast traffic stream and each the described entrance provider edge equipment PE corresponding to multicast traffic stream that needs the switching circulation way of circulation way in the described useless multicast traffic stream when being;
Announcement module is used for sending notice message to the described entry PE of determining; Described notice message is used to indicate the described circulation way of the multicast traffic stream of switching circulation way that needs corresponding to this entry PE and switches to data multicast distribution tree mode by acquiescence multicast distribution tree mode.
The embodiment of the invention also provides a kind of network equipment, comprises the transmission device of the above-mentioned multicast traffic stream that the embodiment of the invention provides.
The beneficial effect of the embodiment of the invention comprises:
The transmission method of the multicast traffic stream that the embodiment of the invention provides, device and the network equipment, make by the outlet PE of receiving multicast data stream the flow load of the useless multicast traffic stream of its reception is monitored, when the flow load of useless multicast traffic stream of monitoring exceeds the threshold value of setting, determine in the useless multicast traffic stream that multicast traffic stream that at least one needs the switch groups broadcast mode and each need to switch entry PE corresponding to circulation way multicast traffic stream; Send the multicast traffic stream that is used to indicate needs switching circulation way corresponding to this entry PE is switched to the Data-MDT mode by the Default-MDT mode notice message to the PE that determines, after entry PE receives this notice message, circulation way with the multicast traffic stream of this notice message indication is transformed into the Data-MDT mode, like this, outlet PE just can not receive that it is at the useless multicast traffic stream of notice message indicating again.The transmission method of the multicast traffic stream that the embodiment of the invention provides, device and the network equipment, by outlet PE according to self multicast traffic stream flow load situation, determine neatly certain or some useless multicast packet stream advertisements are fed a mouthful PE, so that the multicast traffic stream of its announcement no longer is sent to this outlet PE, alleviated the load of the useless multicast traffic stream of outlet PE, saved outlet PE connected public-network bandwidth and outlet PE and processed resource.
Description of drawings
Fig. 1 is the schematic diagram that the multicast packet of a multicasting VPN in the prior art is propagated;
The flow chart of the transmission method of the multicast traffic stream that Fig. 2 provides for the embodiment of the invention;
The flow chart of the handling process of entry PE in the transmission method of the multicast traffic stream that Fig. 3 provides for the embodiment of the invention;
The structural representation of the transmission device of the multicast traffic stream that Fig. 4 provides for the embodiment of the invention;
The structural representation of the determination module that Fig. 5 provides for the embodiment of the invention;
The structural representation of the announcement module that Fig. 6 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of transmission method, device and the network equipment of a kind of multicast traffic stream that the embodiment of the invention is provided is described in detail.
The transmission method of the multicast traffic stream that the embodiment of the invention provides as shown in Figure 2, comprises the steps:
The outlet provider edge equipment PE of S201, receiving multicast data stream judges whether the flow load of the useless multicast traffic stream of its reception surpasses the threshold value of setting; If when surpassing the threshold value of setting, carry out following step S202;
S202, this outlet PE determine that at least one need to switch the multicast traffic stream of circulation way and entry PE corresponding to multicast traffic stream that each need to switch circulation way in the useless multicast traffic stream of its reception;
S203, this outlet PE are to the entry PE of determining, and the circulation way that sends the multicast traffic stream that is used to indicate needs switching circulation way corresponding to this entry PE is switched to the notice message of data multicast distribution tree (Data-MDT) mode by acquiescence multicast distribution tree (Default-MDT) mode.
Among the above-mentioned steps S201, the flow load of outlet PE monitoring self unwanted (being useless) multicast traffic stream when the flow load of monitoring exceeds the flow threshold of setting, triggers execution in step S202, otherwise is in the traffic monitoring state always.
Among the above-mentioned steps S202, outlet PE, for each entry PE, collection is from the flow value of the useless multicast traffic stream of this entry PE reception, sort from big to small or from small to large according to flow value, the multicast traffic stream of the setting number that begins from peak flow values in the sequence of ordering needing to be defined as the multicast traffic stream of switch groups broadcast mode.
Specifically, in embodiments of the present invention, with the entry PE under the multicast traffic stream, affiliated private network multicast source, and the information of affiliated private network multicast group identifies a multicast traffic stream, namely (entry PE identifies, the private network multicast source address, private network multicast group group address) triplet information identifies a multicast traffic stream, example with Fig. 1, the data traffic of the useless multicast traffic stream that outlet PE 4 each entry PE of monitoring are sent, comprise the useless multicast traffic stream (PE1 that sends from entry PE 1, S1, G1) flow is 4M/s, useless multicast traffic stream (the PE1 that sends from entry PE 1, S2, G2) flow is 2M/s, and the useless multicast traffic stream (PE2 that sends from entry PE 2, S3, G3) flow is 3M/s, and outlet PE 4 sorts as follows according to the size order of flow:
(PE1、S1、G1)：4M；
(PE2、S3、G3)：3M；
(PE1、S2、G2)：2M。
Outlet PE 4 can be according to the flow load situation of self, decision to outlet PE 1 feedback will (PE1, S1, G1) the multicast circulation way switch to the notice message of Data-MDT mode by the Default-MDT mode, perhaps determine to outlet PE 1 feedback the multicast traffic stream of the multicast traffic stream of (PE1, S1, G1) and (PE2, S3, G3) to be switched to by the Default-MDT mode notice message of Data-MDT mode.Perhaps determine to feed back the notice message that above-mentioned three multicast traffic streams is all switched to the Data-MDT mode by the Default-MDT mode to outlet PE 1 and outlet PE 2.
Perhaps PE4 also can be first switches to Data-MDT mode with the multicast circulation way of (PE1, S1, G1) by the Default-MDT mode to outlet PE 1 announcement, and then whether according to self flow load situation, determining neatly needs to continue to outlet PE 2 announcements the multicast circulation way that flow is arranged in the multicast traffic stream of deputy (PE2, S3, G3) to be switched to the Data-MDT mode by the Default-MDT mode.
Among the step S203, outlet PE is after the multicast traffic stream of the switching that has determined to carry out the multicast circulation way, switch the relevant informations such as entry PE sign, private network multicast source address and private network multicast group group address of the multicast traffic stream of multicast circulation way according at least one needs of determining, generate notice message, inform that in this notice message the multicast circulation way of entry PE which or which multicast traffic stream need to switch to the Data-MDT mode by the Default-MDT mode.
Outlet PE is carried at the notice message that generates in the existing private network multicast control message, through the multicast of the Default-MDT definition mode that floods, is distributed to all PE in the multicast domain.Thus, entry PE relevant with this notice message among the Default-MDT has also just been received corresponding notice message, and carries out respective handling according to this notice message.
After above-mentioned steps S203, this outlet PE is when receiving data multicast distribution tree that entry PE sends according to this notice message and join message, and refusal joins this data multicast distribution tree and joins message in the data multicast distribution tree of indication.Like this, the multicast traffic stream that the needs of determining in step S201 switch circulation way just can not re-send among this outlet PE.
In the transmission method of the multicast traffic stream that the embodiment of the invention provides, the handling process of entry PE comprises the steps: as shown in Figure 3
The notice message that the outlet PE of the entry PE receiving multicast data stream of S301, transmission multicast traffic stream sends; At least one multicast traffic stream that this notice message is used to indicate this entry PE transmission need to switch to data multicast distribution tree circulation way by acquiescence multicast distribution tree circulation way;
S302, entry PE are switched the multicast traffic stream establishment data multicast distribution tree of circulation way for the needs of this notice message indication;
S303, entry PE are propagated the multicast traffic stream of notice message indication via the data multicast data delivery tree that creates.
Among the above-mentioned steps S302 that the embodiment of the invention provides, it is same as the prior art that entry PE is that multicast traffic stream that the needs of notice message indication switch circulation way creates the concrete methods of realizing of data multicast distribution tree, the information of the group address (P-G) of namely propagating according to the private network multicast source address (C-S) of this multicast traffic stream that carries in the notice message and private network multicast group address (C-G) and this multicast traffic stream public network, the generated data multicast distribution tree joins message, and the response message of the adding data multicast distribution tree of the outlet PE feedback of this multicast traffic stream of reception needs reception, then this multicast traffic stream being sent to these has on the outlet PE of demand this multicast traffic stream, thereby saved those this multicast traffic stream is not had the outlet PE connected public-network bandwidth of demand and the processing resource of outlet PE.
Based on same inventive concept, the embodiment of the invention also provides a kind of transmission device and network equipment of multicast traffic stream, because the principle that this device and equipment are dealt with problems is similar to the transmission method of aforementioned a kind of multicast traffic stream, therefore the enforcement of this device and the network equipment can referring to the enforcement of method, repeat part and not give unnecessary details.
The transmission device of the multicast traffic stream that the embodiment of the invention provides as shown in Figure 4, comprising:
Further, above-mentioned determination module 402 as shown in Figure 5, specifically comprises:
Ordering submodule 4021 is used for for each entry PE, collects from the flow value of each useless multicast traffic stream of this entry PE reception, and should sort according to size to the flow value of collecting;
Determine submodule 4022, the multicast traffic stream that is used for setting number that sequence is begun from peak flow values needing to be defined as the multicast traffic stream of switch groups broadcast mode.
Further, above-mentioned announcement module 403 as shown in Figure 6, specifically comprises:
Generate submodule 4031, corresponding entry PE sign, private network multicast source address and the private network multicast group group address of multicast traffic stream that is used for switching circulation way according to described at least one needs of determining generates notice message;
The transmission device of the multicast traffic stream that the embodiment of the invention provides can also comprise further: data multicast distribution tree processing module 404 is used for receiving entry PE and joins message according to the data multicast distribution tree that notice message sends; Refusal joins the data multicast distribution tree that this data multicast distribution tree joins message and indicates.
The transmission device of the multicast traffic stream that the embodiment of the invention provides further can also comprise:
Sending module 407, the multicast traffic stream that the notice message that is used for receiving is indicated is propagated via the data multicast data delivery tree that creates.
The embodiment of the invention also provides a kind of network equipment, and the transmission device of the above-mentioned multicast traffic stream that is provided by the embodiment of the invention is provided in this equipment.
The transmission method of the multicast traffic stream that the embodiment of the invention provides, device and the network equipment, make by the outlet PE of receiving multicast data stream the flow load of the useless multicast traffic stream of its reception is monitored, when the flow load of useless multicast traffic stream of monitoring exceeds the threshold value of setting, determine in the useless multicast traffic stream that multicast traffic stream that at least one needs the switch groups broadcast mode and each need to switch entry PE corresponding to circulation way multicast traffic stream; Send the multicast traffic stream that is used to indicate needs switching circulation way corresponding to this entry PE is switched to the Data-MDT mode by the Default-MDT mode notice message to the PE that determines, after entry PE receives this notice message, circulation way with the multicast traffic stream of this notice message indication is transformed into the Data-MDT mode, like this, outlet PE just can not receive that it is at the useless multicast traffic stream of notice message indicating again.In the embodiment of the invention, by outlet PE according to self multicast traffic stream flow load situation, determine neatly certain or some useless multicast packet stream advertisements are fed a mouthful PE, so that the multicast traffic stream of its announcement no longer is sent to this outlet PE, alleviated the load of the useless multicast traffic stream of outlet PE, saved outlet PE connected public-network bandwidth and outlet PE and processed resource.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. the transmission method of a multicast traffic stream is characterized in that, comprising:
The outlet provider edge equipment PE of receiving multicast data stream judges when the flow load of the useless multicast traffic stream that receives surpasses the threshold value of setting, and determines that at least one need to switch multicast traffic stream and the corresponding entry PE thereof of circulation way in the described useless multicast traffic stream;
Described outlet PE sends notice message to the described entry PE of determining; Described notice message is used to indicate the described circulation way of the multicast traffic stream of switching circulation way that needs corresponding to this entry PE and switches to data multicast distribution tree mode by acquiescence multicast distribution tree mode;
Described outlet PE is when receiving data multicast distribution tree that entry PE sends according to described notice message and join message, and refusal joins described data multicast distribution tree and joins message in the data multicast distribution tree of indication.
2. the method for claim 1 is characterized in that, at least one need to switch the multicast traffic stream of circulation way in described definite described useless multicast traffic stream, comprising:
For each entry PE, described outlet PE is collected from the flow value of each useless multicast traffic stream of this entry PE reception, and the flow value of collecting is sorted according to size;
The multicast traffic stream of the setting number that begins from peak flow values in the sequence needing to be defined as the multicast traffic stream of switch groups broadcast mode.
3. the method for claim 1 is characterized in that, outlet PE sends described notice message to entry PE and realizes by following manner:
Entry PE sign, private network multicast source address and private network multicast group group address that the multicast traffic stream that described outlet PE is switched circulation way according to described at least one needs of determining is corresponding generate described notice message;
Described outlet PE is carried at described notice message in the private network multicast control message, through the multicast of the acquiescence multicast distribution tree definition mode that floods, is distributed to all PE in the multicast domain.
4. the transmission device of a multicast traffic stream is characterized in that, comprising:
Judge module is used for judging whether the flow load of the useless multicast traffic stream that receives surpasses the threshold value of setting;
Determination module is used in described judge module judged result determining that at least one need to switch the multicast traffic stream of circulation way and the entrance provider edge equipment PE of correspondence thereof in the described useless multicast traffic stream when being;
Announcement module is used for sending notice message to the described entry PE of determining; Described notice message is used to indicate the described circulation way of the multicast traffic stream of switching circulation way that needs corresponding to this entry PE and switches to data multicast distribution tree mode by acquiescence multicast distribution tree mode;
Data multicast distribution tree processing module is used for when receiving data multicast distribution tree that entry PE sends according to described notice message and join message, and refusal joins described data multicast distribution tree and joins message in the data multicast distribution tree of indication.
5. device as claimed in claim 4 is characterized in that, described determination module specifically comprises:
The ordering submodule is used for for each entry PE, collects from the flow value of each useless multicast traffic stream of this entry PE reception, and the flow value of collecting is sorted according to size;
Determine submodule, the multicast traffic stream that is used for setting number that sequence is begun from peak flow values needing to be defined as the multicast traffic stream of switch groups broadcast mode.
6. device as claimed in claim 4 is characterized in that, described announcement module specifically comprises:
Generate submodule, corresponding entry PE sign, private network multicast source address and the private network multicast group group address of multicast traffic stream that is used for switching circulation way according to described at least one needs of determining generates described notice message;
The distribution submodule is used for described notice message is carried at private network multicast control message, through the multicast of the acquiescence multicast distribution tree definition mode that floods, is distributed to all PE in the multicast domain.
7. device as claimed in claim 4 is characterized in that, also comprises:
Receiver module, the notice message that the outlet PE that the multicast traffic stream that sends for reception is corresponding sends; The circulation way that described notice message is used to indicate at least one multicast traffic stream that sends need to switch to data multicast distribution tree mode by acquiescence multicast distribution tree mode;
Creation module is used for when receiver module receives described notice message, switches the multicast traffic stream establishment data multicast distribution tree of circulation way for the needs of described notice message indication;
Sending module is used for the multicast traffic stream of described notice message indication is propagated via the data multicast data delivery tree that creates.
8. a network equipment is characterized in that, comprises the transmission device such as each described multicast traffic stream of claim 4-7.
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| CN102123096B (en) * | 2011-03-11 | 2012-10-10 | 北京星网锐捷网络技术有限公司 | Method and device for releasing decapsulation entry hardware entry resource, equipment and system |
| CN103685040B (en) * | 2013-12-02 | 2017-01-18 | 杭州华三通信技术有限公司 | MD (multicast domain) based multicast VPN (virtual private network) traffic optimization method and equipment |
| CN105281953B (en) * | 2015-10-20 | 2019-03-05 | 北京星网锐捷网络技术有限公司 | Network failure processing method and the edge device of service provider |
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| CN1964309A (en) * | 2006-10-13 | 2007-05-16 | 中国移动通信集团公司 | A method to realize VPN multicast |
| CN101364888A (en) * | 2008-09-16 | 2009-02-11 | 杭州华三通信技术有限公司 | A data multicast address multiplex method and a backbone network edge apparatus |
| CN101645790A (en) * | 2009-08-10 | 2010-02-10 | 杭州华三通信技术有限公司 | Switching-over method, device and system of multicast distribution tree |
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| CN1964309A (en) * | 2006-10-13 | 2007-05-16 | 中国移动通信集团公司 | A method to realize VPN multicast |
| CN101364888A (en) * | 2008-09-16 | 2009-02-11 | 杭州华三通信技术有限公司 | A data multicast address multiplex method and a backbone network edge apparatus |
| CN101645790A (en) * | 2009-08-10 | 2010-02-10 | 杭州华三通信技术有限公司 | Switching-over method, device and system of multicast distribution tree |
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