CN102299848A - Multicast message transmission method and provider edge device (PE) - Google Patents
Multicast message transmission method and provider edge device (PE) Download PDFInfo
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Abstract
The invention discloses a multicast message transmission method and a provider edge device (PE). The method comprises the following steps that: receiving a private network multicast message which needs to be performed multicast transmission in multicast virtual private network (MVPN) by the PE; determining whether the received private network multicast message is a private network multicast protocol message or a private network multicast data message; when the private network multicast message is determined to be the private network multicast protocol message, carrying out multicast transmission to the private network multicast protocol message on a public network through a first multicast distribution tree of a multicast group corresponding o the MVPN; when the private network multicast message is determined to be the private network multicast data message, carrying out multicast transmission to the private network multicast data message on the public network through a second multicast distribution tree of the multicast group corresponding o the MVPN. By using a scheme provided by embodiments of the invention, when the private network multicast message, which is packaged as the public network multicast message, is transmitted on the public network, distinguish between the private network multicast protocol message and the private network multicast data message can be realized.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of multicast message transmission method and provider edge equipment.
Background technology
At present, at multiprotocol label switching/Internet protocol (MPLS/IP, multi-protocol label switching/Internet Protocol) in the network, main Border Gateway Protocol/multiprotocol label switching (BGP/MPLS that uses, Border Gateway Protocol/multi-protocol label switching) method is set up Virtual Private Network (VPN, Virtual Private Network), i.e. BGP/MPLS VPN.For carry out the transmission of the multicast message between the user terminal in the VPN network (being private network) in the BGP/MPLS vpn environment, existing comparatively widely used is multicast domain MD scheme, and the main process of MD scheme is as follows:
Each VPN network that carries out the multicast message transmission is called multicasting virtual private network (MVPN, Multicast Virtual Private Network), (be called for short the P network at carrier network, be public network) the middle Protocol Independent Multicast Routing Protocol (PIM that disposes, Protocol Independent Multicast), the provider edge equipment PE (Provider Edge Device) that will link to each other with each user terminal in the MVPN network forms acquiescence multicast group Default-Group, and be unique multicast address in P network of this MVPN network allocation, be called public network default set address, this address i.e. the group address of this Default-Group.Between each PE of this Default-Group, can pass through multicast routing protocol PIM-SM (Protocol Independent Multicast-Sparse Mode, Protocol Independent Multicast-sparse mode) mode or by PIM-SSM (Protocol Independent Multicast-Source-Specific Multicast, Protocol Independent Multicast-specific multicast source) mode is set up the public network of its corresponding Default-Group and is given tacit consent to multicast distribution tree Default-MDT for this MVPN.The public network Default-MDT that uses PIM-SM and PIM-SSM to set up distinguishes to some extent, and is specific as follows:
Be illustrated in figure 1 as the schematic diagram that uses the PIM-SM mode to set up public network Default-MDT, each PE among the Default-Group of MVPN correspondence is to the pairing RP of this Default-Group (Rendezvous Point, convergent point) transmission joins message, carry the public network default set address of this Default-Group in joining message, RP is according to joining message of receiving, foundation is root node with RP, each PE that joins message that carries this public network default set address with transmission is the public network Default-MDT of end-node, promptly sets up the public network Default-MDT of the Default-Group of this MVPN correspondence.
Be illustrated in figure 2 as the schematic diagram that uses the PIM-SSM mode to set up public network Default-MDT, each PE among the Default-Group of MVPN correspondence all sends to other PE and joins message, carry the public network default set address of this Default-Group in joining message, for each PE, according to joining message of receiving, foundation is with from as root node, with other PE among this Default-Group under self be the public network Default-MDT of end-node, promptly set up the public network Default-MDT of the Default-Group of this MVPN correspondence.
After setting up public network Default-MDT, between each PE of Default-Group, can be by the public network Default-MDT that has set up, private network multicast message to this MVPN in public network carries out multicast transmission, thereby further be implemented in the multicast transmission of this private network multicast message among this MVPN, be example with the public network Default-MDT that adopts the PIM-SSM mode to set up below, the multicast transmission flow process of private network multicast message be introduced:
As shown in Figure 3, when having the private network multicast message to carry out multicast transmission in the MVPN network, the multicast source in this MVPN network (promptly sending the user terminal of private network multicast message) sends to coupled transmitting terminal PE with the private network multicast message; Transmitting terminal PE finds out the Default-Group corresponding with this MVPN, and the public network Default-MDT of this Default-Group that has set up, and the employing packaged type corresponding with this Default-Group, private network multicast message in this MVPN is encapsulated, obtain the public network multicast message, and be root node with this transmitting terminal PE, other PE is this public network multicast message of transmission among this public network Default-MDT of end-node; Receiving terminal PE is after receiving this public network multicast message, adopt the decapsulation mode corresponding with this public network Default-Group, this public network multicast message that receives is carried out decapsulation, obtain the private network multicast message in this MVPN, and then this private network multicast message is forwarded to the user terminal among this MVPN that links to each other with receiving terminal PE.
Yet, in the scheme that private network multicast message in the above-mentioned MVPN transmits by public network, transmit again after the private network multicast message need being encapsulated as the public network multicast message, after being encapsulated as the public network multicast message, some attributes for the private network multicast message then can't be discerned, for example, can't identify packaged private network multicast message in the public network multicast message, be private network multicast protocol message or private network multicast data message, and for the message of different attribute, some processing modes in transmission course are different, for example, different with the service quality QOS requirement of data message for protocol massages, corresponding processing mode is then different, and for example generally not carrying out charge on traffic for protocol massages handles, then carry out charge on traffic for data message and handle, therefore, after the private network multicast message is encapsulated as the public network multicast message, can't realize differentiation, thereby then cause in transmission course, to carry out differentiating and processing private network multicast message type.
Summary of the invention
The embodiment of the invention provides a kind of multicast message transmission method and provider edge equipment, in order to solve exist in the prior art transmission is encapsulated as the private network multicast message of public network multicast message in public network the time, can't realize the problem that dissimilar private network multicast messages is distinguished.
The embodiment of the invention provides a kind of multicast message transmission method, comprising:
The private network multicast message that needs to carry out multicast transmission among the provider edge equipment PE receiving group Virtual Private Network MVPN;
Determine that the described private network multicast message that receives is private network multicast protocol message or private network multicast data message;
When definite described private network multicast message was private network multicast protocol message, first multicast distribution tree of the multicast group by described MVPN correspondence carried out multicast transmission to described private network multicast protocol message in public network;
When definite described private network multicast message was the private network multicast data message, second multicast distribution tree of the multicast group by described MVPN correspondence carried out multicast transmission to described private network multicast data message in public network.
The embodiment of the invention also provides a kind of provider edge equipment PE, comprising:
Receiving element is used for the private network multicast message that receiving group Virtual Private Network MVPN needs to carry out multicast transmission;
Determining unit is used for determining that the described private network multicast message that receives is private network multicast protocol message or private network multicast data message;
First transmission unit is used for when definite described private network multicast message is private network multicast protocol message, and first multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast protocol message in public network;
Second transmission unit is used for when definite described private network multicast message is the private network multicast data message, and second multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast data message in public network.
Beneficial effect of the present invention comprises:
In the method that the embodiment of the invention provides, after PE needs to carry out the private network multicast message of multicast transmission in receiving MVPN, determine that at first this private network multicast message is private network multicast protocol message or private network multicast data message, when being private network multicast protocol message, first multicast distribution tree of the multicast group by the MVPN correspondence, in public network, this private network multicast protocol message is carried out multicast transmission, when being the private network multicast data message, second multicast distribution tree of the multicast group by the MVPN correspondence carries out multicast transmission to this private network multicast data message in public network.Owing to transmit private network multicast protocol message and private network multicast data message by different multicast distribution trees in the scheme, thereby in transmission course, can realize differentiation based on the multicast distribution tree difference that is adopted to private network multicast protocol message and private network multicast data message.
Description of drawings
Fig. 1 sets up the schematic diagram of public network Default-MDT for using the PIM-SM mode in the prior art;
Fig. 2 sets up the schematic diagram of public network Default-MDT for using the PIM-SSM mode in the prior art;
Fig. 3 carries out the schematic diagram of multicast transmission to the private network multicast message for available technology adopting public network Default-MDT;
The flow chart of the multicast message transmission method that Fig. 4 provides for the embodiment of the invention;
The flow chart of the multicast message transmission method that provides in the embodiment of the invention 1 is provided Fig. 5;
The flow chart of the multicast message transmission method that provides in the embodiment of the invention 2 is provided Fig. 6;
The structural representation of the provider edge equipment that provides in the embodiment of the invention 3 is provided Fig. 7.
Embodiment
When being encapsulated as the private network multicast message of public network multicast message in order to be given in the public network transmission, the implementation that can distinguish dissimilar private network multicast messages, the embodiment of the invention provides a kind of multicast message transmission method and provider edge equipment, below in conjunction with Figure of description the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein only is used for description and interpretation the present invention, and is not used in qualification the present invention.And under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
The embodiment of the invention provides a kind of multicast message transmission method, as shown in Figure 4, comprising:
Step S401, PE receive the private network multicast message that needs to carry out multicast transmission among the MVPN.
Step S402, definite this private network multicast message that receives are private network multicast protocol message or private network multicast data message.
Step S403, when definite this private network multicast message is private network multicast protocol message, first multicast distribution tree of the multicast group by this MVPN correspondence carries out multicast transmission to this private network multicast protocol message in public network;
When definite this private network multicast message was the private network multicast data message, second multicast distribution tree of the multicast group by this MVPN correspondence carried out multicast transmission to this private network multicast data message in public network.
Preferable, in such scheme, for the multicast transmission of private network multicast protocol message, first public network acquiescence multicast distribution tree of acquiescence multicast group that specifically can be by this MVPN correspondence transmits; Multicast transmission for the private network multicast data message, second public network acquiescence multicast distribution tree of acquiescence multicast group that specifically can be by this MVPN correspondence transmits, perhaps by this MVPN correspondence, and the public network data multicast distribution tree of the data multicast group corresponding with private network destination address in this private network multicast data message transmits.
Preferable, in such scheme, can also be based on first multicast distribution tree and second multicast distribution tree different, realization is to the private network multicast protocol message and the private network multicast data message of corresponding transmission separately, adopt corresponding processing policy to handle respectively, for example, charge on traffic is handled and service quality Q OS handles.
Below in conjunction with accompanying drawing, method provided by the invention and device are described in detail with specific embodiment.
Embodiment 1:
In the present embodiment 1 for the multicast transmission of private network multicast protocol message, specifically first public network of the acquiescence multicast group by this MVPN correspondence acquiescence multicast distribution tree transmits, for the multicast transmission of private network multicast data message, specifically second public network of the acquiescence multicast group by this MVPN correspondence acquiescence multicast distribution tree transmits.
The flow chart of the multicast message transmission method that provides in the embodiment of the invention 1 is provided, specifically comprises following treatment step:
User terminal among step S501, the MVPN sends to coupled PE with the private network multicast message that needs carry out multicast transmission; Carry source address and private network destination address in this private network multicast message.
After step S502, this PE receive this private network multicast message of this user terminal transmission, determine the type of this private network multicast message, determine that promptly private network multicast protocol message still is the private network multicast data message.Specifically can determine according to the value of type field in the message, also can determine according to the private network destination address that carries in the message, because some private network destination addresses are exclusively used in transmission protocol message, be exclusively used in data message transmission during some private network destination addresses.
When definite this private network multicast message is private network multicast protocol message, enter step S503.
When definite this private network multicast message is the private network multicast data message, enter step S505.
Step S503, the first public network default set address of using the acquiescence multicast group of MVPN correspondence are encapsulated as the first public network multicast message of public network destination address for this first public network default set address with this private network multicast protocol message.
Specifically can adopt following encapsulation process to this private network multicast protocol message:
PE determines the interface identifier of the interface of this private network multicast protocol message of reception, can determine the network identity of the MVPN under this private network multicast protocol message based on this interface identifier, thereby determine the first public network default set address of the acquiescence multicast group of this MVPN correspondence, and this first public network default set address is corresponding with the protocol massages type, be specially: behind the network identity of determining the MVPN under this private network multicast protocol message, from the group address table of this network identity correspondence, based on the protocol massages type, search the corresponding relation of type of message and public network default set address, determine the first public network default set address corresponding with the protocol massages type;
This first public network default set address that use is determined is encapsulated as the first public network multicast message of public network destination address for this first public network default set address with this private network multicast protocol message.
Step S504, PE pass through first public network acquiescence multicast distribution tree of the acquiescence multicast group of this MVPN in public network after this private network multicast protocol message is carried out encapsulation process, this first public network multicast message is carried out multicast transmission; Wherein, first public network acquiescence multicast distribution tree is corresponding with the first public network default set address.
Be specifically as follows: PE is based on this first public network default set address of determining, find out corresponding first public network acquiescence multicast distribution tree, preserving for the public network destination address in first public network acquiescence multicast distribution tree is the forwarding interface information of the public network multicast message of the first public network default set address, thereby, this first public network multicast message is transmitted from the forwarding interface of this forwarding interface information correspondence by this first public network acquiescence multicast distribution tree.
For the foundation of first public network acquiescence multicast distribution tree, can adopt variety of way of the prior art, no longer be described in detail at this.
PE transmits this first public network multicast message in public network by first public network acquiescence multicast distribution tree after, this first public network multicast message will be forwarded to other PE of the acquiescence multicast group of this MVPN, in this process, transferring equipment in the public network can be according to the public network destination address of this first public network multicast message, promptly the first public network default set address is carried out message and is transmitted; Other PE carries out decapsulation to this first public network multicast message that receives to be handled, obtain this private network multicast protocol message, and be transmitted to the user terminal that the reception demand is arranged that is connected, specifically can transmit based on the private network destination address that carries in this private network multicast protocol message.
Preferable, in the process that the first public network multicast message is transmitted, can also adopt and the first corresponding processing policy of first multicast distribution tree (being specially first public network acquiescence multicast distribution tree in this step), the first public network multicast message that transmits by this first multicast distribution tree in public network is handled, this handling process can be carried out by this PE, also can carry out by the forwarding unit of transmitting this first public network multicast message in the public network, specifically can be based on the public network destination address that carries in the first public network multicast message, promptly the first public network default set address adopts relative strategy to handle.
Concrete, this first processing policy specifically can comprise charge on traffic strategy or service quality QOS strategy, also can comprise charge on traffic strategy and QOS strategy, corresponding processing is the charge on traffic processing and QOS handles.Specific strategy can adopt various strategy of the prior art, no longer is described in detail at this.
Step S505, the second public network default set address of using the acquiescence multicast group of MVPN correspondence are encapsulated as the second public network multicast message of public network destination address for this second public network default set address with this private network multicast data message.
Specifically can adopt following encapsulation process to this private network multicast data message:
PE determines the interface identifier of the interface of this private network multicast data message of reception, can determine the network identity of the MVPN under this private network multicast data message based on this interface identifier, thereby determine the second public network default set address of the acquiescence multicast group of this MVPN correspondence, and this second public network default set address is corresponding with the data message type, be specially: behind the network identity of determining the MVPN under this private network multicast protocol message, from the group address table of this network identity correspondence, based on the data message type, search the corresponding relation of type of message and public network default set address, determine the second public network default set address corresponding with the data message type;
This second public network default set address that use is determined is encapsulated as the second public network multicast message of public network destination address for this second public network default set address with this private network multicast data message.
Step S506, PE pass through second public network acquiescence multicast distribution tree of the acquiescence multicast group of this MVPN in public network after this private network multicast data message is carried out encapsulation process, this second public network multicast message is carried out multicast transmission; Wherein, second public network acquiescence multicast distribution tree is corresponding with the second public network default set address.
Be specifically as follows: PE is based on this second public network default set address of determining, find out corresponding second public network acquiescence multicast distribution tree, preserving for the public network destination address in second public network acquiescence multicast distribution tree is the forwarding interface information of the public network multicast message of the second public network default set address, thereby, this second public network multicast message is transmitted from the forwarding interface of this forwarding interface information correspondence by this second public network acquiescence multicast distribution tree.
For the foundation of second public network acquiescence multicast distribution tree, can adopt variety of way of the prior art, no longer be described in detail at this.
PE transmits this second public network multicast message in public network by second public network acquiescence multicast distribution tree after, this second public network multicast message will be forwarded to other PE of the acquiescence multicast group of this MVPN, in this process, transferring equipment in the public network can be according to the public network destination address of this second public network multicast message, promptly the second public network default set address is carried out message and is transmitted; Other PE carries out decapsulation to this second public network multicast message that receives to be handled, obtain this private network multicast data message, and be transmitted to the user terminal that the reception demand is arranged that is connected, specifically can transmit based on the private network destination address that carries in this private network multicast data message.
Preferable, in the process that the second public network multicast message is transmitted, can also adopt and the second corresponding processing policy of second multicast distribution tree (being specially second public network acquiescence multicast distribution tree in this step), the second public network multicast message that transmits by this second multicast distribution tree in public network is handled, this handling process can be carried out by this PE, also can carry out by the forwarding unit of transmitting this second public network multicast message in the public network, specifically can be based on the public network destination address that carries in the second public network multicast message, promptly the second public network default set address adopts relative strategy to handle.
Concrete, this second processing policy specifically can comprise charge on traffic strategy or QOS strategy, also can comprise charge on traffic strategy and QOS strategy, corresponding processing is roam charging processing and QOS handles.Specific strategy can adopt various strategy of the prior art, no longer is described in detail at this.
Adopt the above-mentioned multicast message transmission method in the embodiment of the invention 1, by different multicast distribution tree transmission private network multicast protocol message and private network multicast data messages, thereby in transmission course, can realize differentiation based on the multicast distribution tree difference that is adopted to private network multicast protocol message and private network multicast data message.
Further, owing to the differentiation that can realize, thereby can handle according to different processing policies with the private network multicast data message at private network multicast protocol message to private network multicast protocol message and private network multicast data message.
Yet, the multicast message transmission method that in the foregoing description 1, provides, multicast transmission for the private network multicast data message, second public network acquiescence multicast distribution tree that specifically is the acquiescence multicast group by this MVPN correspondence transmits, based on prior art as can be known, the acquiescence multicast group of MVPN correspondence has comprised the PE that all user terminals link to each other among this MVPN, but for the private network multicast data message, be not be among this MVPN except that transmitting terminal other all user terminals the reception demand of this private network multicast data message is all arranged, thereby be not to be the reception demand that other all PE except that transmitting terminal PE in the acquiescence multicast group of this MVPN correspondence all have this private network multicast data message yet, so, transmit this private network multicast data message to the PE of the reception demand of this private network multicast data message not, caused the waste of bandwidth resources, for solving this technical problem, the multicast message transmission method among the following embodiment 2 is proposed.
Embodiment 2:
In the present embodiment 2 for the multicast transmission of private network multicast protocol message, specifically first public network of the acquiescence multicast group by this MVPN correspondence acquiescence multicast distribution tree transmits, multicast transmission for the private network multicast data message, concrete by this MVPN correspondence, and the public network data multicast distribution tree of the data multicast group corresponding with private network destination address in this private network multicast data message transmits.
The flow chart of the multicast message transmission method that provides in the embodiment of the invention 2 is provided, specifically comprises following treatment step:
User terminal among step S601, the MVPN sends to coupled PE with the private network multicast message that needs carry out multicast transmission; Carry source address and private network destination address in this private network multicast message.
After step S602, this PE receive this private network multicast message of this user terminal transmission, determine the type of this private network multicast message, determine that promptly private network multicast protocol message still is the private network multicast data message.Specifically can determine according to the value of type field in the message, also can determine according to the private network destination address that carries in the message, because some private network destination addresses are exclusively used in transmission protocol message, be exclusively used in data message transmission during some private network destination addresses.
When definite this private network multicast message is private network multicast protocol message, enter step S603.
When definite this private network multicast message is the private network multicast data message, enter step S605.
Step S603, the first public network default set address of using the acquiescence multicast group of MVPN correspondence are encapsulated as the first public network multicast message of public network destination address for this first public network default set address with this private network multicast protocol message.
Specifically can adopt following encapsulation process to this private network multicast protocol message:
PE determines the interface identifier of the interface of this private network multicast protocol message of reception, can determine the network identity of the MVPN under this private network multicast protocol message based on this interface identifier, thereby determine the first public network default set address of the acquiescence multicast group of this MVPN correspondence, and this first public network default set address is corresponding with the protocol massages type, be specially: behind the network identity of determining the MVPN under this private network multicast protocol message, from the group address table of this network identity correspondence, based on the protocol massages type, search the corresponding relation of type of message and public network default set address, determine the first public network default set address corresponding with the protocol massages type;
This first public network default set address that use is determined is encapsulated as the first public network multicast message of public network destination address for this first public network default set address with this private network multicast protocol message.
Step S604, PE pass through first public network acquiescence multicast distribution tree of the acquiescence multicast group of this MVPN in public network after this private network multicast protocol message is carried out encapsulation process, this first public network multicast message is carried out multicast transmission; Wherein, first public network acquiescence multicast distribution tree is corresponding with the first public network default set address.
Be specifically as follows: PE is based on this first public network default set address of determining, find out corresponding first public network acquiescence multicast distribution tree, preserving for the public network destination address in first public network acquiescence multicast distribution tree is the forwarding interface information of the public network multicast message of the first public network default set address, thereby, this first public network multicast message is transmitted from the forwarding interface of this forwarding interface information correspondence by this first public network acquiescence multicast distribution tree.
For the foundation of first public network acquiescence multicast distribution tree, can adopt variety of way of the prior art, no longer be described in detail at this.
PE transmits this first public network multicast message in public network by first public network acquiescence multicast distribution tree after, this first public network multicast message will be forwarded to other PE of the acquiescence multicast group of this MVPN, in this process, transferring equipment in the public network can be according to the public network destination address of this first public network multicast message, promptly the first public network default set address is carried out message and is transmitted; Other PE carries out decapsulation to this first public network multicast message that receives to be handled, obtain this private network multicast protocol message, and be transmitted to the user terminal that the reception demand is arranged that is connected, specifically can transmit based on the private network destination address that carries in this private network multicast protocol message.
Preferable, in the process that the first public network multicast message is transmitted, can also adopt and the first corresponding processing policy of first multicast distribution tree (being specially first public network acquiescence multicast distribution tree in this step), the first public network multicast message that transmits by this first multicast distribution tree in public network is handled, this handling process can be carried out by this PE, also can carry out by the forwarding unit of transmitting this first public network multicast message in the public network, specifically can be based on the public network destination address that carries in the first public network multicast message, promptly the first public network default set address adopts relative strategy to handle.
Concrete, this first processing policy specifically can comprise charge on traffic strategy or service quality QOS strategy, also can comprise charge on traffic strategy and QOS strategy, corresponding processing is roam charging processing and QOS handles.Specific strategy can adopt various strategy of the prior art, no longer is described in detail at this.
Step S605, use are corresponding with MVPN, and the public network data set address of the data multicast group corresponding with source address in this private network multicast data message and private network destination address is encapsulated as the three public network multicast message of public network destination address for this public network data set address with this private network multicast data message.
Wherein, corresponding with MVPN, and the public network data set address of the data multicast group corresponding with source address in this private network multicast data message and private network destination address, for being the transmission institute addresses distributed of the private network multicast data message of this source address and this private network destination address in advance, included PE is the PE that has the user terminal of transmission demand of the private network multicast data message of this source address and this private network destination address to link to each other in this data multicast group.
Specifically can adopt following encapsulation process to this private network multicast data message:
PE determines the interface identifier of the interface of this private network multicast data message of reception, can determine the network identity of the MVPN under this private network multicast data message based on this interface identifier, PE also obtains source address and the destination address that carries from this private network multicast data message that receives, can determine MVPN correspondence under this private network multicast data message based on this source address and this private network destination address, and with this source address and the corresponding data multicast group of this private network destination address, thereby determine the public network data set address of this data multicast group of this MVPN correspondence, and this public network data set address is still corresponding with the data message type, be specially: behind the network identity of determining the MVPN under this private network multicast protocol message, from the group address table of this network identity correspondence, based on this source address, this private network destination address and data message type, search source address, the corresponding relation of private network destination address and type of message and public network data set address is determined and this source address, the public network data set address of this private network destination address and data message type correspondence;
This public network data set address that use is determined is encapsulated as the three public network multicast message of public network destination address for this public network data set address with this private network multicast data message.
Step S606, PE pass through the public network data multicast distribution tree of this data multicast group of this MVPN in public network after this private network multicast data message is carried out encapsulation process, the 3rd public network multicast message is carried out multicast transmission; Wherein, public network data multicast distribution tree is corresponding with public network data set address.
Be specifically as follows: PE is based on this public network data set address of determining, find out corresponding public network data multicast distribution tree, preserve in the public network data multicast distribution tree for the public network destination address is the forwarding interface information of the public network multicast message of public network data set address, thereby, the 3rd public network multicast message is transmitted from the forwarding interface of this forwarding interface information correspondence by this public network data multicast distribution tree.
Wherein, public network data multicast distribution tree can be used for and will carry out multicast transmission between message each PE in public network data multicast group, foundation for public network data multicast distribution tree, specifically can between each PE of acquiescence multicast group, send and join message by the acquiescence multicast distribution tree, carry private network destination address and corresponding public network data set address in joining message, thereby realize having the foundation of the public network data multicast distribution tree of the public network data multicast group that each PE that each user terminal connected of identical private network destination address forms.
PE transmits the 3rd public network multicast message in public network by public network data multicast distribution tree after, the 3rd public network multicast message will be forwarded to other PE of this data multicast group of this MVPN correspondence, in this process, transferring equipment in the public network can be according to the public network destination address of the 3rd public network multicast message, be public network data set address, carry out message and transmit; Other PE carries out decapsulation to the 3rd public network multicast message that receives to be handled, obtain this private network multicast data message, and be transmitted to the user terminal that the reception demand is arranged that is connected, specifically can transmit based on the private network destination address that carries in this private network multicast data message.
Preferable, in the process that the 3rd public network multicast message is transmitted, can also adopt and the second corresponding processing policy of second multicast distribution tree (being specially public network data multicast distribution tree in this step), the 3rd public network multicast message that transmits by this second multicast distribution tree in public network is handled, this handling process can be carried out by this PE, also can carry out by the forwarding unit of transmitting the 3rd public network multicast message in the public network, specifically can be based on the public network destination address that carries in the 3rd public network multicast message, be public network data set address, adopt relative strategy to handle.
Concrete, this second processing policy specifically can comprise charge on traffic strategy or QOS strategy, also can comprise charge on traffic strategy and QOS strategy, corresponding processing is roam charging processing and QOS handles.Specific strategy can adopt various strategy of the prior art, no longer is described in detail at this.
Adopt the above-mentioned multicast message transmission method in the embodiment of the invention 2, not only realize differentiation to private network multicast protocol message and private network multicast data message, and handle according to different processing policies with the private network multicast data message at private network multicast protocol message, can also avoid transmitting this private network multicast data message, reduce the waste of bandwidth resources to the PE of the reception demand of this private network multicast data message not.
Preferable, multicast transmission for the private network multicast data message, can also be with the scheme of using second public network acquiescence multicast distribution tree to transmit in the foregoing description 1, combine with the scheme of using public network data multicast distribution tree to transmit in the foregoing description 2, promptly at first adopt the scheme in the foregoing description 2 to determine corresponding public network data set address, after determining, then use corresponding data multicast distribution tree to carry out multicast transmission, after not determining, adopt the scheme in the foregoing description 1 to determine the second corresponding public network default set address, and use the second corresponding acquiescence multicast distribution tree to carry out multicast transmission.The concrete handling process of this scheme that combines can no longer be described in detail at this with reference to the description among the foregoing description 1 and the embodiment 2.
Embodiment 3:
Based on same inventive concept, according to the multicast message transmission method that the above embodiment of the present invention provides, correspondingly, the embodiment of the invention 3 also provides a kind of provider edge equipment, and its structural representation specifically comprises as shown in Figure 7:
Receiving element 701 is used for the private network multicast message that receiving group Virtual Private Network MVPN needs to carry out multicast transmission;
Determining unit 702 is used for determining that the described private network multicast message that receives is private network multicast protocol message or private network multicast data message;
First transmission unit 703 is used for when definite described private network multicast message is private network multicast protocol message, and first multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast protocol message in public network;
Second transmission unit 704 is used for when definite described private network multicast message is the private network multicast data message, and second multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast data message in public network.
Preferable, first transmission unit 703, specifically be used to use the first public network default set address of the acquiescence multicast group of described MVPN correspondence, described private network multicast protocol message is encapsulated as the first public network multicast message that the public network destination address is the described first public network default set address; And first public network by described acquiescence multicast group is given tacit consent to multicast distribution tree in public network, and the described first public network multicast message is carried out multicast transmission.
Preferable, second transmission unit 704, specifically be used to use the second public network default set address of the acquiescence multicast group of described MVPN correspondence, described private network multicast data message is encapsulated as the second public network multicast message that the public network destination address is the described second public network default set address; And second public network by described acquiescence multicast group is given tacit consent to multicast distribution tree in public network, and the described second public network multicast message is carried out multicast transmission; Perhaps
Specifically be used to use corresponding with described MVPN, and the public network data set address of the data multicast group corresponding with source address in the described private network multicast data message and private network destination address is encapsulated as the 3rd public network multicast message that the public network destination address is described public network data set address with described private network multicast data message; And in public network by the public network data multicast distribution tree of described data multicast group, described the 3rd public network multicast message is carried out multicast transmission.
Preferable, above-mentioned provider edge equipment also comprises:
First processing unit 705 is used to adopt first processing policy corresponding with described first multicast distribution tree, to handling by the described private network multicast protocol message of described first multicast distribution tree transmission in public network;
Second processing unit 706 is used to adopt second processing policy corresponding with described second multicast distribution tree, to handling by the described private network multicast data message of described second multicast distribution tree transmission in public network.
Preferable, first processing unit 705, specifically be used to adopt the first flow charging policy corresponding and/or the first service quality QOS strategy, the described private network multicast protocol message by described first multicast distribution tree transmission in public network is carried out charge on traffic processing and/or QOS processing with described first multicast distribution tree;
Second processing unit 706, specifically be used to adopt second charge on traffic strategy corresponding and/or the 2nd QOS strategy, the described private network multicast data message by described second multicast distribution tree transmission in public network is carried out charge on traffic processing and/or QOS processing with described second multicast distribution tree.
In sum, the scheme that the embodiment of the invention provides comprises: PE receives the private network multicast message that needs to carry out multicast transmission among the MVPN; And determine that this private network multicast message that receives is private network multicast protocol message or private network multicast data message; And when definite this private network multicast message was private network multicast protocol message, first multicast distribution tree of the multicast group by this MVPN correspondence carried out multicast transmission to this private network multicast protocol message in public network; When definite this private network multicast message was the private network multicast data message, second multicast distribution tree of the multicast group by this MVPN correspondence carried out multicast transmission to this private network multicast data message in public network.The scheme that adopts the embodiment of the invention to provide when transmission is encapsulated as the private network multicast message of public network multicast message in public network, realizes the differentiation to private network multicast protocol message and private network multicast data message.
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 (10)
1. a multicast message transmission method is characterized in that, comprising:
The private network multicast message that needs to carry out multicast transmission among the provider edge equipment PE receiving group Virtual Private Network MVPN;
Determine that the described private network multicast message that receives is private network multicast protocol message or private network multicast data message;
When definite described private network multicast message was private network multicast protocol message, first multicast distribution tree of the multicast group by described MVPN correspondence carried out multicast transmission to described private network multicast protocol message in public network;
When definite described private network multicast message was the private network multicast data message, second multicast distribution tree of the multicast group by described MVPN correspondence carried out multicast transmission to described private network multicast data message in public network.
2. the method for claim 1 is characterized in that, first multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast protocol message in carrier network, specifically comprise:
Use the first public network default set address of the acquiescence multicast group of described MVPN correspondence, described private network multicast protocol message is encapsulated as the first public network multicast message that the public network destination address is the described first public network default set address; And
In public network,, the described first public network multicast message is carried out multicast transmission by first public network acquiescence multicast distribution tree of described acquiescence multicast group.
3. the method for claim 1 is characterized in that, second multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast data message in public network, specifically comprise:
Use the second public network default set address of the acquiescence multicast group of described MVPN correspondence, described private network multicast data message is encapsulated as the second public network multicast message that the public network destination address is the described second public network default set address; And second public network by described acquiescence multicast group is given tacit consent to multicast distribution tree in public network, and the described second public network multicast message is carried out multicast transmission; Perhaps
Use corresponding with described MVPN, and the public network data set address of the data multicast group corresponding with source address in the described private network multicast data message and private network destination address is encapsulated as the 3rd public network multicast message that the public network destination address is described public network data set address with described private network multicast data message; And in public network by the public network data multicast distribution tree of described data multicast group, described the 3rd public network multicast message is carried out multicast transmission.
4. as the arbitrary described method of claim 1-3, it is characterized in that, also comprise:
Adopt first processing policy corresponding, in public network, handling by the described private network multicast protocol message of described first multicast distribution tree transmission with described first multicast distribution tree;
Adopt second processing policy corresponding, in public network, handling by the described private network multicast data message of described second multicast distribution tree transmission with described second multicast distribution tree.
5. method as claimed in claim 4 is characterized in that, adopts first processing policy corresponding with described first multicast distribution tree, to handling by the described private network multicast protocol message of described first multicast distribution tree transmission in public network, specifically comprises:
Adopt the first flow charging policy corresponding and/or the first service quality QOS strategy, the described private network multicast protocol message by described first multicast distribution tree transmission in public network is carried out charge on traffic processing and/or QOS processing with described first multicast distribution tree;
Adopt second processing policy corresponding,, specifically comprise in public network, handling by the described private network multicast data message of described second multicast distribution tree transmission with described second multicast distribution tree:
Adopt second charge on traffic strategy and/or the two QOS strategy corresponding, the described private network multicast data message by described second multicast distribution tree transmission in public network is carried out charge on traffic processing and/or QOS processing with described second multicast distribution tree.
6. a provider edge equipment PE is characterized in that, comprising:
Receiving element is used for the private network multicast message that receiving group Virtual Private Network MVPN needs to carry out multicast transmission;
Determining unit is used for determining that the described private network multicast message that receives is private network multicast protocol message or private network multicast data message;
First transmission unit is used for when definite described private network multicast message is private network multicast protocol message, and first multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast protocol message in public network;
Second transmission unit is used for when definite described private network multicast message is the private network multicast data message, and second multicast distribution tree of the multicast group by described MVPN correspondence carries out multicast transmission to described private network multicast data message in public network.
7. provider edge equipment as claimed in claim 6, it is characterized in that, described first transmission unit, specifically be used to use the first public network default set address of the acquiescence multicast group of described MVPN correspondence, described private network multicast protocol message is encapsulated as the first public network multicast message that the public network destination address is the described first public network default set address; And first public network by described acquiescence multicast group is given tacit consent to multicast distribution tree in public network, and the described first public network multicast message is carried out multicast transmission.
8. provider edge equipment as claimed in claim 6, it is characterized in that, described second transmission unit, specifically be used to use the second public network default set address of the acquiescence multicast group of described MVPN correspondence, described private network multicast data message is encapsulated as the second public network multicast message that the public network destination address is the described second public network default set address; And second public network by described acquiescence multicast group is given tacit consent to multicast distribution tree in public network, and the described second public network multicast message is carried out multicast transmission; Perhaps
Specifically be used to use corresponding with described MVPN, and the public network data set address of the data multicast group corresponding with source address in the described private network multicast data message and private network destination address is encapsulated as the 3rd public network multicast message that the public network destination address is described public network data set address with described private network multicast data message; And in public network by the public network data multicast distribution tree of described data multicast group, described the 3rd public network multicast message is carried out multicast transmission.
9. as the arbitrary described provider edge equipment of claim 6-8, it is characterized in that, also comprise:
First processing unit is used to adopt first processing policy corresponding with described first multicast distribution tree, to handling by the described private network multicast protocol message of described first multicast distribution tree transmission in public network;
Second processing unit is used to adopt second processing policy corresponding with described second multicast distribution tree, to handling by the described private network multicast data message of described second multicast distribution tree transmission in public network.
10. provider edge equipment as claimed in claim 9, it is characterized in that, described first processing unit, specifically be used to adopt the first flow charging policy corresponding and/or the first service quality QOS strategy, the described private network multicast protocol message by described first multicast distribution tree transmission in public network is carried out charge on traffic processing and/or QOS processing with described first multicast distribution tree;
Described second processing unit, specifically be used to adopt second charge on traffic strategy corresponding and/or the 2nd QOS strategy, the described private network multicast data message by described second multicast distribution tree transmission in public network is carried out charge on traffic processing and/or QOS processing with described second multicast distribution tree.
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