CN102045250A - Forwarding method for multicast message in VPLS, and service provider edge equipment - Google Patents
Forwarding method for multicast message in VPLS, and service provider edge equipment Download PDFInfo
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Abstract
The invention provides a forwarding method for a multicast message in a virtual private local area network (LAN) service (VPLS), and service provider edge equipment (PE). Through the establishment of a virtual link (PW) logic interface, a second layer multicast protocol is introduced into a second layer control plane. At the view angle of the second layer control plane, the PW logic interface is the same as the common second layer Ethernet interface and can participate in the calculation of various application protocols of the control plane. In the invention, the established PW logic interface is taken as the second layer Ethernet interface to operate the second layer multicast protocol, a corresponding multicast forwarding table entry is established, and the multicast message is forwarded according to the established multicast forwarding table entry, so that the multicast message is correctly forwarded, the burden of the PE equipment is reduced and the bandwidth resources of a public network are further saved.
Description
Technical field
The present invention relates to the network communications technology, the retransmission method of multicast message and service provider's edge device (PE) among particularly a kind of VPLS.
Background technology
Virtual special local area network service (VPLS) is a kind of implementation of multiprotocol label switching double-layer virtual private network (MPLSL2VPN), the L2VPN that is used to provide multi-multipoint serves, VPLS typical case networking as shown in Figure 1, its networking layoutprocedure can for: set up the public network tunnel between each Provider Edge equipment (PE), this public network tunnel can be the tunnel of generic route encapsulation (GRE), common label switching path (LSP) or other type; On each PE, create virtual switch instance (VSI) then and in VSI, dispose virtual link (PW), require between all PE, to set up the full PW that connects; At last, place in circuit (AC) interface is joined among the VSI, wherein the AC interface is that PE goes up the LI(link interface) that connects CE.
Concrete unicast message repeating process is example with the CE1 among Fig. 1 to CE2, when PE1 receives from the message of CE1, determines the mac address forwarding table of the affiliated VSI of this message, searches the PW label that receives the AC1 correspondence of this message in this mac address forwarding table; After message added the PW label, carry out the public network tunnel encapsulation after, send by the public network tunnel.PE2 removes the public network tunnel encapsulation earlier after receiving message from public network, removes the PW label again, finds corresponding VSI according to the PW label, searches the mac address forwarding table of this VSI correspondence again, determines the AC2 of PW label correspondence, sends to CE2 by this AC2.
By above process as can be seen, only can know the parameters such as sign, PW label of PW on control plane, these all are based on messages that PW realizes and transmit.And intercept agreement Layer 2 Multicast agreements such as (IGMP Snooping) such as internet group management is two layers of application protocol that are operated in control plane, mutual and the calculating of these agreements all is based on two layers of port, but can't see two layers of port in the prior protocols message, can't be in VPLS with the Layer 2 Multicast protocol application.Therefore, the forwarding that has multicast message in VPLS now all adopts the mode of broadcasting to send, and as shown in Figure 2, after PE1 receives the multicast message of multicast source transmission, understands this message of broadcasting among PW all in VSI and other AC.But,, then be not that the main frame 2 of this multicast member also can receive this multicast message if only added this multicast group by main frame 3 and main frame 4.This obviously is that main frame 2 is unwilling to receive, and PE duplicates a message for each PW and AC, increases the burden of PE equipment, also can take the public-network bandwidth resource of preciousness more.
Summary of the invention
In view of this, the invention provides the retransmission method and the PE of multicast message among a kind of VPLS, so that multicast message is transmitted to multicast member exactly, and reduce the burden of PE equipment, save the public-network bandwidth resource more.
The retransmission method of multicast message among a kind of VPLS, this method comprises:
On PE, create the PW logic interfacing that is associated with the PW label, and described PW logic interfacing is associated with VSI;
Adopt the Layer 2 Multicast agreement, on described PE, described PW logic interfacing is set up the multicast forwarding list item of described VSI correspondence as two layers of Ethernet interface;
After described PE received multicast message, the VSI that definite incoming interface that receives this multicast message is associated utilized outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining.
A kind of PE, this PE comprises:
The logic interfacing creating unit is used to create the PW logic interfacing that is associated with the PW label, and described PW logic interfacing is associated with VSI;
The multicast list creating unit is used to adopt the Layer 2 Multicast agreement, described PW logic interfacing is set up the multicast forwarding list item of described VSI correspondence as two layers of Ethernet interface;
The multicast message processing unit, after being used to receive multicast message, the VSI that definite incoming interface that receives this multicast message is associated utilizes outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining.
As can be seen from the above technical solutions, the present invention introduces two layers of control plane by creating PW logic interfacing with the Layer 2 Multicast agreement, angle from two layers of control plane, PW logic interfacing is just the same with two layers of common Ethernet interface, can participate in the calculating of the various application protocols of control plane, just can set up corresponding multicast forwarding list item by this PW logic interfacing, thereby realize the accurate forwarding of multicast message; For the interface during outgoing interface is not tabulated in the multicast forwarding list item, PE can also not transmit by this interface by the duplicated multicast message, obviously with respect to broadcast mode of the prior art, has reduced the burden of PE equipment, saves the public-network bandwidth resource more.
Description of drawings
Fig. 1 is the typical networking schematic diagram of VPLS;
Fig. 2 is the forwarding schematic diagram of multicast message in the prior art;
The detailed method flow chart that Fig. 3 provides for the embodiment of the invention;
Fig. 4 transmits schematic diagram for the multicast message that the embodiment of the invention provides;
Fig. 5 is a PE structural representation provided by the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Method provided by the invention mainly comprises: create the PW logic interfacing that is associated with each PW, and this PW logic interfacing is associated with VSI; On PE, this PW logic interfacing is set up the multicast forwarding list item of this VSI correspondence as two layers of Ethernet interface; After PE received multicast message, the VSI that definite incoming interface that receives this multicast message is associated utilized outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining.
In said method, after creating PW logic interfacing, this PW logic interfacing can be applied to IGMP Snooping, multicast listener and find to intercept in agreement (MLD Snooping) or the multicast virtual local area network Layer 2 Multicast agreements such as (VLAN), utilize the mode of these agreements to set up the multicast forwarding list item of VSI correspondence.
Be that example is described in detail said method with IGMP Snooping below.The detailed method flow chart that Fig. 3 provides for the embodiment of the invention, as shown in Figure 3, this method can may further comprise the steps:
Step 301: create PW logic interfacing, this logic interfacing is associated with VSI.
Creating PW logic interfacing can comprise: the ID of the PW of the title of appointment PW logic interfacing, signaling protocol, opposite end interface IP address, encapsulated type, correspondence etc., can also further specify MTU attributes such as (MTU).Wherein, the signaling protocol of appointment can comprise: tag distribution protocol (LDP), Border Gateway Protocol (BGP) etc.
Give one example at this, the configuration of PW logic interfacing can be expressed as follows:
Under the default situations, PW logic interfacing can not belong to any VSI, transmits in order to allow PW logic interfacing participate in message, can after the establishment of PW logic interfacing finishes the PW logic interfacing of creating be added among the VSI.A PW logic interfacing can only add among the VSI, but a VSI can corresponding a plurality of PW logic interfacings.
Carry out PW by PW logic interfacing between the step 302:PE and consult, and the PW label is associated with PW logic interfacing.
When creating PW logic interfacing,, therefore, identify with this ID at the PW that carries out PW negotiation foundation between the PE for PW has specified ID.
After PW consulted successfully, the physical state of PW logic interfacing just can start (UP).
In addition, also there is Link State in PW logic interfacing except physical state, as long as after this PW logic interfacing finds corresponding public network tunnel according to the tunnel strategy of appointment, the Link State of PW logic interfacing just can UP.
After PW consults to finish, the PW label that negotiates can be associated with PW logic interfacing, so that when carrying out the multicast message forwarding, Layer 2 Multicast and PW retransmission technique can be carried out seamless combination.Specifically in the description of follow-up multicast forwarding, relate to.
So far, PW logic interfacing has been arranged, just the Layer 2 Multicast agreement can be incorporated among the VPLS at control plane.Be example with IGMP Snooping agreement in the following step, illustrate and utilize the PW interface to carry out the Layer 2 Multicast message forwarding.In this embodiment, in order to support Layer 2 Multicast in the VPLS networking, CE and PE will move IGMP Snooping agreement, if having a plurality of VSI and each VSI all to need to support Layer 2 Multicast on the PE equipment, each VSI will move the IGMP agreement so.
When step 303:PE receives IGMP group polling message by the AC interface, this IGMP group polling message is transmitted by all PW logic interfacing of this PE, and this AC interface is added in the router port list of corresponding VSI.If receive IGMP group polling message, then this IGMP group polling message is transmitted by all AC interface of this PE, and the PW logic interfacing that will receive IGMP group polling message adds in the router port list of corresponding VSI by PW logic interfacing.
Since the igmp querying device can be periodically in this network segment All hosts and router transmission IGMP group polling message inquire about multicast member in this network segment, therefore, after PE receives IGMP group polling message by the AC interface, and this AC interface is added before the router port list of corresponding VSI, can also comprise: PE judges whether comprised this AC interface in the router port list of this VSI correspondence, if, the ageing timer of this AC interface in this router port list of then resetting finishes this step.Otherwise, this AC interface is added the router port list of corresponding VSI, and starts the ageing timer of this AC interface correspondence in the router port list.
Equally, after PE receives IGMP group polling message by PW logic interfacing, and before the PW logic interfacing that will receive IGMP group polling message adds in the router port list of corresponding VSI, also comprise: PE judges whether comprised this PW logic interfacing in the router port list of this VSI correspondence, if, the ageing timer of this PW logic interfacing in this router port list then reset finishes this step.Otherwise, this PW logic interfacing is added the router port list of corresponding VSI, and starts the ageing timer of this PW logic interfacing correspondence in the router port list.
If the ageing timer of AC interface or PW logic interfacing correspondence is when aging in the router port list, do not receive IGMP group polling message by this AC interface or PW logic interfacing again, then this AC interface or PW logic interfacing are deleted from this router port list.
With VPLS group-network construction shown in Figure 4 is example, has multicast source and multicast router in website 1, serves as the igmp querying device by this multicast router.This igmp querying device regularly sends IGMP group polling message.After PE1 receives IGMP group polling message by interface AC1, transmit by all PW logic interfacing PW1, PW2 and PW3, and this interface AC1 is added in the router port list of VSI, start the ageing timer of this AC1; If PE1 receives IGMP group polling message by AC then, the ageing timer of this AC1 of then resetting once more in the ageing timer of AC1.
After PE3 receives IGMP group polling message by PW logic interfacing PW1, be that AC3 transmits by all AC interfaces, and PW1 added in the router port list of VSI, start the ageing timer of this PW1; If PE2 receives IGMP group polling message by PW1 then, the ageing timer of this PW1 of then resetting once more in the ageing timer of PW1.PE2 carries out the processing similar to PE3 with PE4, repeats no more.
After step 304:PE equipment receives IGMP member relation report message by the AC interface, this IGMP member relation report message is transmitted by ports all in the router port list of VSI, parse multicast group address, create the multicast forwarding list item, and the AC interface that will receive IGMP member relation report message adds in the outgoing interface tabulation of multicast forwarding list item.After receiving IGMP member relation report message by PW logic interfacing, this IGMP member relation report message is transmitted by ports all in the router port list of VSI, parse multicast group address, create the multicast forwarding list item, and the PW logic interfacing that will receive IGMP member relation report message adds in the outgoing interface tabulation of multicast forwarding list item.
Before creating the multicast forwarding list item, PE equipment can judge whether to create the multicast forwarding list item at this multicast group address, if not, then create the multicast forwarding list item at this multicast group address, when AC interface or PW logic interfacing being added in the outgoing interface tabulation of this multicast forwarding list item, start the ageing timer of this AC interface or PW logic interfacing; If, judge in the outgoing interface tabulation of this multicast forwarding list item and whether comprised this AC interface or PW logic interfacing, if, the ageing timer of this AC interface in the tabulation of this outgoing interface or the PW logic interfacing then reset, otherwise when this AC interface or PW logic interfacing being added in the outgoing interface tabulation of this multicast forwarding list item, start the ageing timer of this AC interface or PW logic interfacing.
The multicast forwarding list item of creating in this step comprises: multicast source address, multicast group address, incoming interface information and outgoing interface information.Wherein incoming interface is the port in the router port list of VSI, and outgoing interface is the interface in the outgoing interface tabulation.
Be example still, add after main frame 3 and main frame 4 receive IGMP group polling message, add this multicast group, then reply IGMP member relation report message with above-mentioned Fig. 4.PE3 is that PW1 transmits by the router port in the router port list after receiving IGMP member relation report message by interface AC3; After parsing multicast group address, set up the multicast forwarding list item, interface AC3 is added in the outgoing interface tabulation of this multicast forwarding list item.After PE4 receives IGMP member relation report message, be that PW2 transmits by the router port in the router port list; After parsing multicast group address, set up the multicast forwarding list item, interface AC4 is added in the outgoing interface tabulation of this multicast forwarding list item.
PE1 is that AC1 transmits by the router port in the router port list after receiving IGMP member relation report message by PW3 and PW2; After parsing multicast group address, set up the multicast forwarding list item, PW3 and PW2 are added in the outgoing interface tabulation of this multicast forwarding list item.
Interface in port among Fig. 4 shown in the square forwarding-table item that to be each PE set up at this multicast group in the outgoing interface tabulation, the port shown in the circle are the interface in the router port list of this VSI.
After step 305:PE receives multicast message by the AC interface, determine the pairing multicast forwarding list item of VSI that this AC interface is associated, multicast source address and multicast group address according to this multicast message are searched this multicast forwarding list item, determine all PW logic interfacing in the corresponding outgoing interface tabulation; For each PW logic interfacing, multicast message is added the PW label related with this PW logic interfacing, and carry out being sent to public network after the corresponding tunnel encapsulation.After PE receives multicast message by public network, this multicast message is separated tunnel encapsulation, after ejecting the PW label, definite PW logic interfacing that is associated with this PW label, search the multicast forwarding list item of the VSI correspondence that this PW logic interfacing is associated, determine this multicast message transmitted by each outgoing interface in the outgoing interface tabulation or on send control plane to handle.
Still being example shown in Fig. 4, after PE1 receives multicast message by interface AC1, search the multicast forwarding list item of the VSI correspondence that interface AC1 is associated according to the source address of this multicast message and multicast group address, determine that all PW logic interfacing is PW2 and PW3 in the corresponding outgoing interface tabulation.This multicast message is sent to PW2 and PW3, and the sending module of PW2 and PW3 correspondence adds the PW label of PW2 and PW3 correspondence respectively with multicast message, and carries out being sent to public network after the corresponding tunnel encapsulation.
After the logical public network of PE3 receives this multicast message, this multicast message is connect tunnel encapsulation, behind the ejection PW label, determine the PW logic interfacing PW1 that is associated with this PW label.The receiver module of PW1 correspondence is searched the multicast forwarding list item of the VSI correspondence that this PW logic interfacing is associated, and the outgoing interface of determining this multicast forwarding list item correspondence is AC3, by AC3 multicast message is transmitted to main frame 3.PE4 carries out and the similar processing of PE3, repeats no more.
As can be seen in this way, multicast message can be sent to main frame 3 and the main frame 4 that adds multicast group exactly, and the main frame 2 that does not add multicast group then can not receive this multicast message, and PE1 can not be sent to public network by PW1 yet.The forward-path of multicast message as shown by arrows among Fig. 4.
If PE by the AC interface receive IGMP leave the group message after, leave the group message according to this IGMP and search corresponding multicast forwarding list item, the ageing timer of this AC in the outgoing interface tabulation of this multicast forwarding list item is reset, and this IGMP is left the group message transmit by ports all in the router port list of VSI.
PE by PW logic interfacing receive IGMP leave the group message after, leave the group message according to this IGMP and search corresponding multicast forwarding list item, the ageing timer of this PW logic interfacing in the outgoing interface tabulation of multicast forwarding list item is reset, and this IGMP is left the group message transmit by ports all in the router port list of VSI.
Overtime when the ageing timer of AC interface or PW logic interfacing, still do not receive IGMP member relation report message, then deletion from the outgoing interface tabulation with this AC interface or PW logic interfacing by AC interface or PW logic interfacing in the outgoing interface tabulation.
More than be the detailed description that method provided by the present invention is carried out, below PE provided by the invention be described in detail.The PE structural representation that Fig. 5 provides for the embodiment of the invention, as shown in Figure 5, this PE equipment can comprise: logic interfacing creating unit 501, multicast list creating unit 502 and multicast message processing unit 503.
Logic interfacing creating unit 501 be used to create the PW logic interfacing that is associated with the PW label, and PW logic interfacing is associated with VSI.
Multicast list creating unit 502 is used to adopt the Layer 2 Multicast agreement, PW logic interfacing is set up the multicast forwarding list item of VSI correspondence as two layers of Ethernet interface.
Multicast message processing unit 503, after being used to receive multicast message, the VSI that definite incoming interface that receives this multicast message is associated utilizes outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining.
In addition, this PE can also comprise: PW negotiation element 504.
Logic interfacing creating unit 501 identifies to create PW logic interfacing by title, signaling protocol, opposite end interface IP address, encapsulated type of specifying PW logic interfacing and the PW that is associated.
PW negotiation element 504 is used for carrying out PW by the PW logic interfacing that logic interfacing creating unit 501 is created and consults, and the PW label of consulting is associated with PW logic interfacing.
Multicast list creating unit 502 is created the Layer 2 Multicast agreement that multicast list adopted and is comprised: IGM PSnooping, MLD Snooping or M-VLAN.
When the Layer 2 Multicast agreement was IGMP Snooping, multicast list creating unit 502 can specifically comprise: query message is handled subelement 5021, report message is handled subelement 5022 and transmitted establishment subelement 5023.
Query message is handled subelement 5021, is used for after this PE receives IGMP group polling message by the AC interface, this IGMP group polling message is transmitted by all PW logic interfacings of this PE, and this AC interface is added in the router port list of VSI; Perhaps, after this PE receives IGMP group polling message by PW logic interfacing, this IGMP group polling message is transmitted by all AC interfaces of this PE, and will be received in the router port list of PW logic interfacing adding VSI of IGMP group polling message.
Report message is handled subelement 5022, is used for after this PE receives IGMP member relation report message by PW logic interfacing, and this IGMP member relation report message is transmitted by ports all in the router port list of VSI; Perhaps, after this PE receives IGMP member relation report message by the AC interface, this IGMP member relation report message is transmitted by all of the port in the router port list of VSI.
Transmit and create subelement 5023, after being used to resolve the multicast group address of IGMP member relation report message, create the multicast forwarding list item, and will receive in the PW logic interfacing of IGMP member relation report message or the outgoing interface tabulation that the AC interface adds the multicast forwarding list item.
More preferably, multicast list creating unit 502 can also comprise: transmit and safeguard subelement 5024 and leave message processing subelement 5024.
Transmit and safeguard subelement 5024, be used for transmitting when creating subelement 5023 and will receive the PW logic interfacing of IGMP member relation report message or outgoing interface tabulation that the AC interface adds the multicast forwarding list item, start in the outgoing interface tabulation and receive the PW logic interfacing of IGMP member relation report message or the ageing timer of AC interface; Leave message is handled PW logic interfacing in the outgoing interfaces tabulation that subelement 5025 determines or the ageing timer of AC interface is reset; After PE received IGMP member relation report message by PW logic interfacing in the outgoing interface tabulation or AC interface, resetting received the PW logic interfacing or the AC interface of IGMP member relation report message; PW logic interfacing or the deletion from the outgoing interface tabulation of AC interface with overtime ageing timer correspondence.
Leave message is handled subelement 5025, be used for this PE receive by PW logic interfacing or AC interface IGMP leave the group message after, leave the group message according to this IGMP and search the multicast forwarding list item, determine to receive PW logic interfacing or the AC interface that IGMP leaves the group message in the outgoing interface tabulation of multicast forwarding list item; This IGMP is left the group message to be transmitted by ports all in the router port list of VSI.
Wherein, multicast message processing unit 503 can specifically comprise: table look-up and handle subelement 5031, logic interfacing transmission subelement 5032 and logic interfacing reception subelement 5033.
Table look-up and handle subelement 5031, be used for after this PE receives multicast message by the AC interface, determine the VSI that this AC interface is associated, the multicast forwarding list item of this VSI correspondence that utilization is determined is determined the PW logic interfacing in the interface list, and the logic interfacing that this multicast message is offered definite PW logic interfacing correspondence sends subelement 5032; After receiving the multicast message that logic interfacing subelement 5033 provides, determine the VSI that this PW logic interfacing subelement is associated, utilize outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining.
Logic interfacing sends subelement 5032, is used for determining sending the PW label that subelement 5032 is associated with this logic interfacing, and this PW label of encapsulation on the multicast message that the processing subelement 5031 of tabling look-up provides, and carry out being sent to public network after the public network tunnel encapsulation.
Logic interfacing receives subelement 5033, after being used for receiving multicast message from public network, ejects the PW label of this multicast message, determines the PW logic interfacing that this PW label is associated, and this multicast message is offered to table look-up handle subelement 5031.
Logic interfacing sends subelement 5032 and is with the different of transmission subelement of two layers of Ethernet interface, and message has been increased PW label and public network tunnel label, has promptly carried out twice encapsulation more.Correspondingly, logic interfacing receives subelement 5033 and is with the different of reception subelement of two layers of Ethernet interface, has increased the peeling off of message public network tunnel label and PW label, and has carried out twice decapsulation promptly more.
By above description as can be seen, the present invention introduces two layers of control plane by creating PW logic interfacing with the Layer 2 Multicast agreement, angle from two layers of control plane, PW logic interfacing is just the same with two layers of common Ethernet interface, can participate in the calculating of the various application protocols of control plane, just can set up corresponding multicast forwarding list item by this PW logic interfacing, thereby realize the accurate forwarding of multicast message; For the interface during outgoing interface is not tabulated in the multicast forwarding list item, PE can also not transmit by this interface by the duplicated multicast message, obviously with respect to broadcast mode of the prior art, has reduced the burden of PE equipment, saves the public-network bandwidth resource more.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (11)
1. the retransmission method of multicast message among the virtual special local area network service VPLS is characterized in that this method comprises:
On Provider Edge equipment PE, create the PW logic interfacing that is associated with virtual link PW label, and described PW logic interfacing is associated with virtual switch instance VSI;
Adopt the Layer 2 Multicast agreement, on described PE, described PW logic interfacing is set up the multicast forwarding list item of described VSI correspondence as two layers of Ethernet interface;
After described PE received multicast message, the VSI that definite incoming interface that receives this multicast message is associated utilized outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining.
2. method according to claim 1, it is characterized in that, when described PE receives multicast message by the AC interface, the forwarding of outgoing interface tabulation the carrying out multicast message of the multicast forwarding list item of this VSI correspondence that described utilization is determined specifically comprises: the multicast forwarding list item of the VSI correspondence that utilization is determined is determined the PW logic interfacing in the interface list, is sent to public network after encapsulating the PW label that is associated with the PW logic interfacing of determining on the described multicast message;
When described PE when public network receives multicast message, the VSI that the incoming interface of described definite this multicast message of reception is associated specifically comprises: after described PE receives multicast message from public network, eject the PW label of this multicast message, determine the PW logic interfacing that this PW label is associated, and determine the VSI that this PW logic interfacing is associated.
3. method according to claim 1 is characterized in that, the PW logic interfacing that described establishment is associated with PW comprises:
The PW sign of specifying title, signaling protocol, opposite end interface IP address, the encapsulated type of described PW logic interfacing and being associated;
Described PE carries out PW by described PW logic interfacing to be consulted, and the PW label of consulting is associated with described PW logic interfacing.
4. according to claim 1,2 or 3 described methods, it is characterized in that described Layer 2 Multicast agreement comprises: internet group management is intercepted agreement IGMP Snooping, multicast listener finds to intercept agreement MLDSnooping or multicast virtual local area network VLAN.
5. method according to claim 4 is characterized in that, when described Layer 2 Multicast agreement was IGMPSnooping, the multicast forwarding list item that described PW logic interfacing is set up described VSI correspondence as two layers of Ethernet interface comprised:
If described PE receives IGMP group polling message by place in circuit AC interface, then this IGMP group polling message is transmitted by all PW logic interfacings of described PE, and this AC interface is added in the router port list of described VSI; After receiving IGMP member relation report message by PW logic interfacing, this IGMP member relation report message is transmitted by ports all in the router port list of described VSI, after parsing the multicast group address of IGMP member relation report message, create the multicast forwarding list item, and the PW logic interfacing that will receive IGMP member relation report message adds in the outgoing interface tabulation of multicast forwarding list item;
If described PE receives IGMP group polling message by PW logic interfacing, then this IGMP group polling message is transmitted by all AC interfaces of described PE, and the PW logic interfacing that will receive IGMP group polling message adds in the router port list of described VSI; After described PE equipment receives IGMP member relation report message by the AC interface, this IGMP member relation report message is transmitted by all of the port in the router port list of described VSI, after parsing the multicast group address in the IGMP member relation report message, create the multicast forwarding list item, and the AC interface that will receive IGMP member relation report message adds in the outgoing interface tabulation of multicast forwarding list item.
6. method according to claim 5, it is characterized in that, in the time of in the outgoing interface tabulation of PW logic interfacing that will receive IGMP member relation report message or AC interface adding multicast forwarding list item, receive the described PW logic interfacing of IGMP member relation report message or the ageing timer of AC interface in the tabulation of startup outgoing interface;
By PW logic interfacing or AC interface receive IGMP leave the group message after, leave the group message according to this IGMP and search the multicast forwarding list item, IGMP leaves the PW logic interfacing of group message or the ageing timer of AC interface is reset with receiving in the tabulation of the outgoing interface of multicast forwarding list item, and this IGMP is left the group message transmit by ports all in the router port list of described VSI;
Ageing timer described PE by this ageing timer correspondence PW logic interfacing or after the AC interface receives IGMP member relation report message, reset; After ageing timer is overtime, with the PW logic interfacing or the deletion from the outgoing interface tabulation of AC interface of this ageing timer correspondence.
7. Provider Edge equipment PE is characterized in that this PE comprises:
The logic interfacing creating unit is used to create the PW logic interfacing that is associated with the PW label, and described PW logic interfacing is associated with VSI;
The multicast list creating unit is used to adopt the Layer 2 Multicast agreement, described PW logic interfacing is set up the multicast forwarding list item of described VSI correspondence as two layers of Ethernet interface;
The multicast message processing unit, after being used to receive multicast message, the VSI that definite incoming interface that receives this multicast message is associated utilizes outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining.
8. PE according to claim 7 is characterized in that, described multicast processing unit comprises: table look-up and handle subelement, logic interfacing transmission subelement and logic interfacing reception subelement;
The described processing subelement of tabling look-up, be used for after this PE receives multicast message by the AC interface, determine the VSI that this AC interface is associated, the multicast forwarding list item of this VSI correspondence that utilization is determined is determined the PW logic interfacing in the interface list, and the logic interfacing that this multicast message is offered definite PW logic interfacing correspondence sends subelement; After receiving the multicast message that described logic interfacing subelement provides, determine the VSI that this PW logic interfacing subelement is associated, utilize outgoing interface tabulation the carrying out forwarding of multicast message of the multicast forwarding list item of this VSI correspondence of determining;
Described logic interfacing sends subelement, is used for determining sending the PW label that subelement is associated with this logic interfacing, and this PW label of encapsulation on the multicast message that the described processing subelement of tabling look-up provides, and carry out being sent to public network after the public network tunnel encapsulation;
Described logic interfacing receives subelement, after being used for receiving multicast message from public network, ejects the PW label of this multicast message, determines the PW logic interfacing that this PW label is associated, and this multicast message is offered the described processing subelement of tabling look-up.
9. PE according to claim 7 is characterized in that, this PE also comprises: the PW negotiation element;
Described logic interfacing creating unit specify title, signaling protocol, opposite end interface IP address, the encapsulated type of described PW logic interfacing and the PW that is associated sign to create PW logic interfacing;
Described PW negotiation element is used for carrying out PW by described PW logic interfacing and consults, and the PW label of consulting is associated with described PW logic interfacing.
10. according to claim 7,8 or 9 described PE, it is characterized in that when described Layer 2 Multicast agreement was IGMP Snooping, described multicast list creating unit comprised:
Query message is handled subelement, is used for after this PE receives IGMP group polling message by the AC interface, this IGMP group polling message is transmitted by all PW logic interfacings of this PE, and this AC interface is added in the router port list of described VSI; Perhaps, after this PE receives IGMP group polling message by PW logic interfacing, this IGMP group polling message is transmitted by all AC interfaces of this PE, and the PW logic interfacing that will receive IGMP group polling message adds in the router port list of described VSI;
Report message is handled subelement, is used for after this PE receives IGMP member relation report message by PW logic interfacing, and this IGMP member relation report message is transmitted by ports all in the router port list of described VSI; Perhaps, after this PE receives IGMP member relation report message by the AC interface, this IGMP member relation report message is transmitted by all of the port in the router port list of described VSI;
Transmit the establishment subelement, after being used to resolve the multicast group address of described IGMP member relation report message, create the multicast forwarding list item, and will receive in the PW logic interfacing of IGMP member relation report message or the outgoing interface tabulation that the AC interface adds the multicast forwarding list item.
11. PE according to claim 10 is characterized in that, described multicast list creating unit also comprises: transmit and safeguard subelement and leave message processing subelement;
Described transmitting safeguarded subelement, be used for transmitting when creating subelement and will receive the PW logic interfacing of IGMP member relation report message or outgoing interface tabulation that the AC interface adds the multicast forwarding list item, start in the outgoing interface tabulation and receive the described PW logic interfacing of IGMP member relation report message or the ageing timer of AC interface described; The PW logic interfacing in the outgoing interface tabulation that described leave message processing subelement is definite or the ageing timer of AC interface are reset; After PE received IGMP member relation report message by PW logic interfacing in the outgoing interface tabulation or AC interface, resetting received the PW logic interfacing or the AC interface of IGMP member relation report message; PW logic interfacing or the deletion from the outgoing interface tabulation of AC interface with overtime ageing timer correspondence;
Described leave message is handled subelement, be used for this PE receive by PW logic interfacing or AC interface IGMP leave the group message after, leave the group message according to this IGMP and search the multicast forwarding list item, determine to receive PW logic interfacing or the AC interface that IGMP leaves the group message in the outgoing interface tabulation of multicast forwarding list item; This IGMP is left the group message to be transmitted by ports all in the router port list of described VSI.
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