CN103067286A

CN103067286A - Multicast data transmission method and equipment

Info

Publication number: CN103067286A
Application number: CN2013100332943A
Authority: CN
Inventors: 宋小恒
Original assignee: Hangzhou H3C Technologies Co Ltd
Current assignee: New H3C Information Technologies Co Ltd
Priority date: 2013-01-25
Filing date: 2013-01-25
Publication date: 2013-04-24
Anticipated expiration: 2033-01-25
Also published as: CN103067286B

Abstract

The invention discloses a multicast data transmission method and equipment. The method comprises the following steps that: BEB (Backbone Edge Bridge) equipment maintains a user multicast group information list according to that whether a receiver of a multicast group exists on a user side and a PW side or not; after receiving a first message of a special multicast group from the user side, the BEB equipment assigns a multicast tunnel address to the special multicast group; the BEB equipment announces the multicast tunnel address to opposite-end BEB equipment with a receiver of the special multicast group according to the maintained multicast group information list and implements flooding of link status information of the multicast tunnel address in an SPB (Shortest Path Bridging) network by the BEB equipment and the opposite-end BEB equipment so as to trigger and generate a multicast transmission tree based on a multicast source and the multicast receiver; and the BEB equipment transmits subsequent messages of the special multicast group through the multicast transmission tree. According to the multicast data transmission method and equipment disclosed by the invention, network resources are saved, and the system stability is improved.

Description

A kind of muticast data transmission method and apparatus

Technical field

The present invention relates to the communications field, relate in particular to a kind of muticast data transmission method and apparatus.

Background technology

SPB(Shortest Path Bridging, shortest path bridge) is IEEE(Institute of Electrical and Electronic Engineers, IEEE) one of ethernet standard of 802.1aq definition, MSTP(Multiple Spanning Tree Protocol, Multiple Spanning Tree Protocol) further extension, be intended to make up the clog-free double layer network of large flat, use SPB-ISIS(Intermediate system to intermediate system, Intermediate System-to-Intermediate System) comes Link State in the shared network, shortest path between each each node of node parallel computation of network, avoided use STP(Spanning Tree Protocol, Spanning-Tree Protocol) unsteadiness and the low deficiency of part of links utilance brought.IEEE802.1aq has defined two SPB patterns: VLAN(Virtual Local Area Network, VLAN) pattern (SPBV) and MAC(Media Access Control, media interviews control)-in-MAC pattern (SPBM), wherein SPBM is present main recommendation pattern, is widely used in data center network.

SPBM supports based on the I-SID(instance number) multicast service of Service Instance, be similar to multicasting VPN (Virtual Private Network, Virtual Private Network) realization thought, SPBM distributes local multicast address to each bridge in the SPT district, each address comprises SPSourceID(Shortest Path Source Identity, the sign in shortest path source), generate multicast group address for each Service Instance according to SPSourceID and I-SID, the form of the multicast address that each SPBM bridge device structure Service Instance is corresponding can be as shown in Figure 1.

Each bridge device in the SPT district is carried out after the SPB calculating, gives this multicast address generating forward list item (being each one of multicast source generation transmits), thus the subset that the forwarding tree that forms is set for the SPT take this bridge device as root.The multicast of corresponding Service Instance, unknown unicast, broadcasting packet are transmitted along the subset of this SPT tree, reach the BEB(Backbone Edge Bridge that has only disposed this Service Instance, the backbone network edge bridges) equipment.

In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem:

In the existing SPBM technical scheme, when there was multicast service in user's side, all multicast services were all transmitted according to the example multicast address that SPSourceID and SPB instance identification I-SID consist of.The flux of multicast that multicast source BEB equipment enters can be flooded to multicast source BEB equipment and belong on the every other BEB equipment of same instance, and whether the main frame of no matter hanging under this BEB equipment exists the recipient of this flux of multicast, has caused the waste of Internet resources.

Summary of the invention

The object of the present invention is to provide a kind of muticast data transmission method and apparatus, with the saving Internet resources, and improve Systems balanth.For this reason, the present invention adopts following technical scheme:

A kind of muticast data transmission method is applied to the backbone network edge bridges BEB equipment in the shortest path bridge SPB network, and the method comprises:

Whether BEB equipment has the recipient of multicast group, maintenance customer's multicast group information table according to user's side and PW side;

After described BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, for this particular multicast group is distributed the Multicast Tunnel address, this Multicast Tunnel address comprises that sign SPSourceID and this BEB equipment in the shortest path source of this BEB equipment are the multicast address of this specific multicast set of dispense;

Described BEB equipment is according to the user multicast group information table of safeguarding, the Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the multicast transmit tree that generates based on multicast source and multicast receivers;

Described BEB equipment is transmitted the subsequent packet of this particular multicast group by described multicast transmit tree.

Wherein, whether described BEB equipment has the recipient of multicast group according to user's side and PW side, and maintenance customer's multicast group information table comprises:

When described BEB equipment receives that from user's side joint multicast group joins message, and the multicast group address and the VLAN Tag that carry in joining message according to described multicast group, and receive the port that this multicast group joins message, when determining self not record to the user multicast group information table that should multicast group joins message, described BEB equipment creates the user multicast group information table to should multicast group joining message, the multicast group address and the virtual LAN VLAN label Tag that carry during this multicast group joined message, the SPB instance number, and the corresponding relation that receives the port that described multicast group joins message is recorded in this user multicast group information table, and this user multicast group joined message is transmitted to opposite end BEB equipment in the corresponding SPB example;

When receiving other BEB equipment, described BEB equipment joins message by the multicast group that PW transmits, and the port that joins message the multicast group address that carries and VLAN Tag and receive this message according to this multicast group, when determining self not record to the user multicast group information table that should multicast group joins message, described BEB equipment creates the user multicast group information table that should multicast group joins message, the multicast group address and the virtual LAN VLAN label Tag that carry during this multicast group is joined message, the SPB instance number, and the corresponding relation that receives the PW that described multicast group joins message is recorded in this user multicast group information table.

Wherein, whether described BEB equipment has the recipient of multicast group according to user's side and PW side, and maintenance customer's multicast group information table also comprises:

When described BEB equipment receives that from user's side joint multicast group joins message, and the multicast group address and the VLAN Tag that carry in joining message according to described multicast group, and receive the port that this multicast group joins message, when determining that self record has the user multicast group information table that should multicast group joins message, whether described BEB equipment is judged to record in this user multicast group information table and is received the local port that this multicast group joins message, if be judged as be, then keep this user multicast group information table, and this user multicast group joined message be transmitted to opposite end BEB equipment in the corresponding SPB example; Otherwise, this port is recorded in this user multicast group information table, and this user multicast group joined message is transmitted to opposite end BEB equipment in the corresponding SPB example;

When receiving other BEB equipment, described BEB equipment joins message by the multicast group that PW transmits, and the port that joins message the multicast group address that carries and VLAN Tag and receive this message according to this multicast group, when determining that self record has the user multicast group information table that should multicast group joins message, whether described BEB equipment is judged to record in this user multicast group information table and is received the PW that this multicast group joins message, then to keep this user multicast group information table if be judged as; Otherwise, this PW is recorded in this user multicast group information table.

Wherein, after described BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, distribute the Multicast Tunnel address for this particular multicast group, be specially:

Described BEB equipment is according to the multicast group address that carries in the described literary composition of reporting for the first time and VLAN Tag, and the SPB instance number is inquired about described user multicast group information table;

If record the multicast group address and the VLAN Tag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and have PW member in this list item, then described BEB equipment distributes the Multicast Tunnel address according to described PW member for this particular multicast group.

Wherein, the method also comprises:

If record the multicast group address and the VLAN Tag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and when not having PW member in this list item, described BEB equipment stops the forwarding of the data flow public network side of this particular multicast group.

Wherein, described BEB equipment triggers the multicast transmit tree that generates based on multicast source and multicast receivers by the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment in the SPB network, be specially:

Described BEB equipment is encapsulated in described Multicast Tunnel address and SPB instance number in the protocol massages by this BEB equipment and opposite end BEB equipment and floods in described SPB network, so that other equipment in described BEB equipment, opposite end BEB equipment and the described SPB network generate the multicast transmit tree based on multicast source and multicast receivers.

Wherein, the method also comprises:

When the main frame of hanging under the described BEB equipment withdraws from multicast group, in user multicast group information table corresponding to the described multicast group of described BEB unit deletion to local port that should main frame;

If described local port last local port for recording in this user multicast group information table, described BEB equipment withdraws from described multicast group to the described BEB equipment of opposite end BEB devices advertise in the SPB example of correspondence so that in user multicast group information table corresponding to the described multicast group of described opposite end BEB unit deletion to PW that should BEB equipment.

Wherein, the method also comprises:

Described BEB equipment is that corresponding multicast group is distributed new Multicast Tunnel address according to the user multicast group information table after upgrading;

Described BEB equipment is according to the user multicast group information table after upgrading, the Multicast Tunnel address notification that this is new is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the new multicast transmit tree that generates based on multicast source and multicast receivers;

Described BEB equipment is transmitted the subsequent packet of this particular multicast group by this new multicast transmit tree.

Wherein, the method also comprises:

A kind of backbone network edge bridges BEB equipment is applied to shortest path bridge SPB network, and this BEB equipment comprises:

Maintenance module is used for whether having according to user's side and PW side the recipient of multicast group, maintenance customer's multicast group information table;

Multicast Tunnel address administration module, be used for after described BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, for this particular multicast group is distributed the Multicast Tunnel address, this Multicast Tunnel address comprises that sign SPSourceID and this BEB equipment in the shortest path source of this BEB equipment are the multicast address of this specific multicast set of dispense;

The forwarding tree generation module, be used for the user multicast group information table according to described maintenance module maintenance, the Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the multicast transmit tree that generates based on multicast source and multicast receivers;

Forwarding module is for the subsequent packet of transmitting this particular multicast group by described multicast transmit tree.

Wherein, described maintenance module specifically is used for,

When described BEB equipment receives that from user's side joint multicast group joins message, and the multicast group address and the VLAN Tag that carry in joining message according to described multicast group, and receive the port that this multicast group joins message, when determining self not record to the user multicast group information table that should multicast group joins message, the user multicast group information table of establishment to should multicast group joining message, the multicast group address and the virtual LAN VLAN label Tag that carry during this multicast group joined message, the SPB instance number, and the corresponding relation that receives the port that described multicast group joins message is recorded in this user multicast group information table, and this user multicast group joined message is transmitted to opposite end BEB equipment in the corresponding SPB example;

When receiving other BEB equipment, described BEB equipment joins message by the multicast group that PW transmits, and the port that joins message the multicast group address that carries and VLAN Tag and receive this message according to this multicast group, when determining self not record to the user multicast group information table that should multicast group joins message, the user multicast group information table of establishment to should multicast group joining message, the multicast group address and the virtual LAN VLAN label Tag that carry during this multicast group joined message, the SPB instance number, and the corresponding relation that receives the PW that described multicast group joins message is recorded in this user multicast group information table.

Wherein, described maintenance module also is used for,

When described BEB equipment receives that from user's side joint multicast group joins message, and the multicast group address and the VLAN Tag that carry in joining message according to described multicast group, and receive the port that this multicast group joins message, when determining that self record has the user multicast group information table that should multicast group joins message, judge whether to record in this user multicast group information table and receive the local port that this multicast group joins message, if be judged as be, then keep this user multicast group information table, and this user multicast group joined message be transmitted to opposite end BEB equipment in the corresponding SPB example; Otherwise, this port is recorded in this user multicast group information table, and this user multicast group joined message is transmitted to opposite end BEB equipment in the corresponding SPB example;

When receiving other BEB equipment, described BEB equipment joins message by the multicast group that PW transmits, and the port that joins message the multicast group address that carries and VLAN Tag and receive this message according to this multicast group, when determining that self record has the user multicast group information table that should multicast group joins message, judge whether to record in this user multicast group information table and receive the PW that this multicast group joins message, then to keep this user multicast group information table if be judged as; Otherwise, this PW is recorded in this user multicast group information table.

Wherein, described Multicast Tunnel address administration module specifically is used for, and according to the multicast group address that carries in the described literary composition of reporting for the first time and VLAN Tag, and the SPB instance number is inquired about described user multicast group information table; If record the multicast group address and the VLANTag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and have PW member in this list item, then described BEB equipment distributes the Multicast Tunnel address according to described PW member for this particular multicast group.

Wherein, described forwarding module also is used for, if record the multicast group address and the VLAN Tag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and when not having PW member in this list item, stop the forwarding of the data flow public network side of this particular multicast group.

Wherein, described forwarding tree generation module specifically is used for, by this BEB equipment and opposite end BEB equipment described Multicast Tunnel address and SPB instance number are encapsulated in the protocol massages and in described SPB network, flood, so that other equipment in described BEB equipment, opposite end BEB equipment and the described SPB network generate the multicast transmit tree based on multicast source and multicast receivers.

Wherein, described maintenance module also is used for, and when the main frame of hanging under the described BEB equipment withdraws from multicast group, deletes in user multicast group information table corresponding to described multicast group local port that should main frame; If described local port last local port for recording in this user multicast group information table, the described BEB equipment of opposite end BEB devices advertise in the SPB example of correspondence withdraws from described multicast group so that in user multicast group information table corresponding to the described multicast group of described opposite end BEB unit deletion to PW that should BEB equipment.

Wherein, described Multicast Tunnel address administration module also is used for, and is that corresponding multicast group is distributed new Multicast Tunnel address according to the user multicast group information table after upgrading;

Described forwarding tree generation module also is used for, according to the user multicast group information table after upgrading, the Multicast Tunnel address notification that this is new is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the new multicast transmit tree that generates based on multicast source and multicast receivers;

Described forwarding module also is used for, and transmits the subsequent packet of this particular multicast group by this new multicast transmit tree.

Wherein, described Multicast Tunnel address administration module specifically is used for, and be the multicast group address difference of correspondence, but the identical multicast traffic stream of PW member distributes identical Multicast Tunnel address.

In the above embodiment of the present invention, whether BEB equipment has the recipient of multicast group according to user's side and PW side, maintenance customer's multicast group information table, after BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, for this particular multicast group is distributed the Multicast Tunnel address, this Multicast Tunnel address comprises that the SPSourceID of this BEB equipment and this BEB equipment are the multicast address of this specific multicast set of dispense, and then according to the user multicast group information table of safeguarding, the Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the multicast transmit tree that generates based on multicast source and multicast receivers; BEB equipment is transmitted the subsequent packet of this particular multicast group by described multicast transmit tree, realized in the SPB territory, carrying out in example according to the recipient of reality the forwarding of multicast traffic stream, in the situation that does not have the far-end recipient, do not allow multicast traffic stream to enter public network, save Internet resources, improved the stability of a system.

Description of drawings

The form schematic diagram of the multicast address that the Service Instance of SPBM bridge device structure is corresponding in Fig. 1 prior art;

Fig. 2 provides the form schematic diagram of a kind of Multicast Tunnel address for the embodiment of the invention;

Fig. 3 provides a kind of schematic flow sheet of muticast data transmission method for the embodiment of the invention;

The structural representation of a kind of BEB equipment that Fig. 4 provides for the embodiment of the invention.

Embodiment

For the above-mentioned problems in the prior art, the embodiment of the invention provides a kind of technical scheme of muticast data transmission, is applied to the SPB network.In this technical scheme, whether BEB equipment has the recipient of multicast group according to user's side and PW side, maintenance customer's multicast group information table, after BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, for this particular multicast group is distributed the Multicast Tunnel address, this Multicast Tunnel address comprises that the SPSourceID of this BEB equipment and this BEB equipment are the multicast address of this specific multicast set of dispense, and then according to the user multicast group information table of safeguarding, the Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the multicast transmit tree that generates based on multicast source and multicast receivers; BEB equipment is transmitted the subsequent packet of this particular multicast group by described multicast transmit tree.

Wherein, can record multicast group address and VLAN Tag(label that multicast group that this BEB equipment receives is carried in joining message in the user multicast group information table of safeguarding in the BEB equipment), SPB instance number (being I-SID) and receive the PW(Pseudo Wire that this multicast group joins message, pseudo-circuit) or/and the corresponding relation of local port, its form can be as shown in table 1:

Table 1

Multicast group address	VLAN?Tag	The SPB instance number	PW	Local port
					...	...	...	...	...

Wherein, multicast group address and VLAN Tag are respectively the multicast group address that multicast group that BEB equipment receives carries in joining message (multicast group address that BEB equipment receives is IP multicast address, and BEB equipment receives and needs to be converted into the Layer 2 Multicast MAC Address behind this IP multicast group address and preserve) and VLAN Tag; The VLAN Tag that the SPB instance number is carried in being joined message according to multicast group by BEB and receive the port that this multicast group joins message and determine; PW is the PW that this multicast group of the opposite end BEB device forwards that receives of BEB equipment joins message; Local port is the port that this multicast group that user's side of receiving of BEB equipment sends joins message.

BEB equipment is that the Multicast Tunnel address that multicast group is distributed can comprise the multicast address (MC Source) that SPSourceID and BEB distribute for this multicast traffic stream (being multicast group), its form can be as shown in Figure 2, wherein, SPBM Address Type is 01, Multicast Tunnel address corresponding to sign multicast source.

In embodiments of the present invention, after BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, the multicast group address that carries in the literary composition of reporting for the first time according to this and VLAN Tag, and the user multicast group information table of corresponding SPB instance number (being determined according to the VLAN Tag that carries in the multicast traffic stream and port of receiving this literary composition of reporting for the first time by BEB equipment) inquiry self maintained, whether there are local reception person's (namely whether having corresponding local port member) and far-end recipient (namely whether having corresponding PW member) with the data flow of determining this particular multicast group, and then according to Query Result this literary composition of reporting for the first time is carried out local replica or/and the public network side copies and transmits, realized in the SPB territory, carrying out in example according to the recipient of reality the forwarding of the data flow of particular multicast group, in the situation that does not have the far-end recipient, do not allow multicast traffic stream to enter public network, save Internet resources, improved the stability of a system.

Below in conjunction with the accompanying drawing in the embodiments of the invention, the technical scheme in the embodiments of the invention is carried out clear, complete description, obviously, the embodiments described below only are the application's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not paying the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of embodiments of the invention protection.

As shown in Figure 3, the schematic flow sheet of a kind of muticast data transmission method that provides for the embodiment of the invention can may further comprise the steps:

Whether step 301, BEB equipment have the recipient of multicast group, maintenance customer's multicast group information table according to user's side and PW side.

Concrete, in embodiments of the present invention, BEB equipment maintenance customer's multicast group information table that need to join message according to the multicast group that user's side and/or PW side joint are received, user multicast group information table is in order to indicating the respective sets multicast group data stream whether to have local reception person and far-end recipient, and then need to determine whether that this multicast packet is flowed to public network transmit after receiving multicast group data stream.

In embodiments of the present invention, when BEB equipment receives that from user's side joint multicast group joins message, multicast group address and VLAN Tag that BEB equipment carries in joining message according to this multicast group, and receive port that this multicast group joins message and judge whether the user multicast group information table that self whether records should multicast group joining message (namely exists multicast group address, VLAN Tag is identical with VLAN Tag with the multicast group address that carries during this multicast group joins message respectively, and SPB instance number and the VLAN Tag that carries during this multicast group joins message and receive the identical user multicast group information table of SPB instance number corresponding to port that this multicast group joins message).

If do not record the user multicast group information table to should multicast group joining message in the BEB equipment, then BEB equipment creates the user multicast group information table to should multicast group joining message, and multicast group address and VLAN Tag, the SPB instance number of carrying during this multicast group joined message and the corresponding relation that receives the port that this multicast group joins message are recorded in this user multicast group information table;

If when recording the user multicast group information table that should multicast group joins message in the BEB equipment, then whether BEB equipment is further judged to have comprised in the local port that records in this user multicast group information table and is received the port that this multicast group joins message; If comprise, then keep this user multicast group information table; If do not comprise, then add in this user multicast group information table receiving the port that this multicast group joins message.

After BEB equipment received that from user's side joint multicast group joins message, also needing this multicast group joined message was transmitted to opposite end BEB equipment in the corresponding SPB example.

When BEB equipment receives multicast group that other BEB equipment (opposite end BEB equipment) transmit by PW and joins message, BEB equipment is according to this multicast group join message multicast group address and the VLANTag that carries and the port that receives this message, judges the user multicast group information table that self whether records should multicast group joining message.

If do not record the user multicast group information table to should multicast group joining message in the BEB equipment, then BEB equipment creates the user multicast group information table to should multicast group joining message, and multicast group address and VLAN Tag, the SPB instance number of carrying during this multicast group is joined message and the corresponding relation that receives the PW that this multicast group joins message are recorded in this user multicast group information table;

If record the user multicast group information table to should multicast group joining message in the BEB equipment, then whether BEB equipment is further judged to include among the PW that records in this user multicast group information table and is received the PW that this multicast group joins message; If comprise, then keep this user multicast group information table; If do not comprise, then add in this user multicast group information table receiving the PW that this multicast group joins message.

Wherein, the user multicast group information table of BEB plant maintenance can be as shown in table 2:

Table 2

According to table 2 as can be known, in the SPB instance number is 1024 SPB example, hang with multicast group address under this BEB equipment local port Port1, the Port2 and be 0100-6E00-0101, VLAN Tag and be the recipient of 1 multicast traffic stream, and this BEB equipment respectively the opposite end BEB equipment of corresponding PW1, PW2 and PW3 also hang with down the recipient of this multicast traffic stream; In like manner, according to this user multicast group information table as can be known BEB equipment whether exist this locality of other multicast traffic streams or/and the far-end recipient.

After step 302, BEB equipment are received the literary composition of reporting for the first time of particular multicast group from user's side joint, for this particular multicast group is distributed the Multicast Tunnel address; Wherein, this Multicast Tunnel address comprises that the SPSourceID of this BEB equipment and this BEB equipment are the multicast address of this specific multicast set of dispense.

Concrete, when BEB equipment is received reporting for the first time during literary composition of certain multicast traffic stream from user's side joint, this BEB equipment is according to the multicast group address that carries in this literary composition of reporting for the first time and VLAN Tag, and SPB instance number inquiring user multicast group information table, and judge multicast group address and the VLAN Tag that whether records in the user multicast group information table carrying in the literary composition of should reporting for the first time, and the user multicast group information table of SPB instance number.

If be judged as be, determine then that there is this locality in this multicast traffic stream or/and the far-end recipient, BEB equipment is transmitted accordingly to multicast traffic stream; Otherwise, illustrating that this multicast traffic stream does not exist local and far-end recipient, BEB equipment is not transmitted (BEB equipment can be set to abandon and be issued to hardware to the processing of corresponding multicast group data) to this multicast traffic stream.

It should be noted that, when BEB equipment is received multicast traffic stream from user's side joint, if in the hardware forwarding table not to forwarding-table item that should multicast traffic stream, BEB equipment can forward the literary composition of reporting for the first time of this multicast traffic stream to control plane and (be uploaded to CPU(Central Processing Unit, CPU)), after CPU receives this message, issue forwarding-table item that should multicast traffic stream to hardware, at this moment, do not comprise concrete outbound port information in this forwarding-table item, BEB equipment is broadcasted multicast traffic stream (this SPB example can be after BEB equipment receives multicast traffic stream determines according to the VLAN Tag that carries in the port that receives this multicast traffic stream and the multicast traffic stream by hardware, also can be determined according to the VLAN Tag that carries in the port information of uploading and the message and is issued to hardware by CPU) according to this forwarding-table item in the SPB of correspondence example; Simultaneously, the query text user multicast group information table of reporting for the first time that CPU also can upload according to hardware, and according to the user multicast group information table that inquires upgrade be issued to hardware to should multicast traffic stream transmit so that BEB equipment carries out transmitting multicast data according to the forwarding-table item after upgrading.

Wherein, when in BEB equipment is determined the user multicast group information table of self maintained, recording the user multicast group information table of the multicast traffic stream that correspondence receives, BEB equipment needs further judge in this user multicast group list item whether have PW member, to determine whether this multicast traffic stream needs to transmit to public network.

If there is not PW member's (but having the local port member) in this user multicast group information table, then BEB equipment thinks that there is not the far-end recipient in this multicast traffic stream, does not need flow is transmitted to public network.BEB equipment carries out local replica according to the local port member to this multicast traffic stream, and transmits by the corresponding port.If have the PW member port in this user multicast group information table, then BEB equipment thinks that there is the far-end recipient in this multicast traffic stream, needs that this multicast packet is flowed to public network and transmits.

Step 303, BEB equipment are according to the user multicast group information table of safeguarding, the Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the multicast transmit tree that generates based on multicast source and multicast receivers.

Concrete, when BEB equipment is determined to have PW member in the user multicast group list item, when determining that namely multicast packet need to be flowed to public network transmits, BEB equipment can distribute the Multicast Tunnel address for this multicast traffic stream according to the PW member in this user multicast group list item, and this Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient according to this user multicast group information table.

After BEB equipment is given each opposite end BEB equipment with the Multicast Tunnel address notification, this Multicast Tunnel address and SPB instance number can be encapsulated in to flood in the protocol massages (ISIS protocol massages) by this BEB equipment and opposite end BEB equipment and (comprise BEB equipment and BCB(Backbone Core Bridge to all devices in the SPB network, the backbone network core bridges) equipment), and trigger the protocol massages that each equipment basis receives in the SPB network and carry out the SPT computing, to obtain corresponding multicast transmit tree.

Wherein, also carry the SPSourceID of self in the protocol massages that BEB equipment and opposite end BEB equipment each equipment in the SPB network floods, after each equipment receives this protocol massages in the SPB network, can be according to the SPSourceID that wherein carries, know receiving equipment or the BEB equipment corresponding to multicast source devices of the multicast traffic stream that this protocol massages is corresponding, for example, if the SPSourceID that carries in the protocol massages that certain BEB equipment sends is identical with the SPSourceID in the Multicast Tunnel address, then this equipment is BEB equipment corresponding to multicast source devices; If not identical, then this equipment is BEB equipment corresponding to multicast receiving equipment.After each equipment receives this protocol massages in the SPB network, carry out the SPT computing according to source device and receiving equipment, generation is to multicast transmit tree that should multicast traffic stream, when carrying out the multicast packet flow forwarding according to this multicast transmit tree, multicast traffic stream can be transmitted to the BEB equipment that does not have far-end recipient and local reception person.

In embodiments of the present invention, BEB equipment is after multicast traffic stream distributes the Multicast Tunnel address, and after opposite end BEB equipment receives the Multicast Tunnel address of BEB devices advertise, can store the corresponding relation of address, multicast group tunnel and relative users multicast group information.The address, multicast group tunnel of wherein, storing in BEB equipment and the opposite end BEB equipment and the corresponding relation of relative users multicast group information can be as shown in table 3:

Table 3

Wherein, different for the multicast group address of correspondence in embodiments of the present invention, but the identical multicast traffic stream of PW member, BEB equipment can distribute identical Multicast Tunnel address.

Correspondingly, when BEB equipment need to distribute the Multicast Tunnel address for multicast traffic stream, BEB equipment can inquire about self the storage address, multicast group tunnel and the corresponding relation of relative users multicast group information, if the PW member corresponding to multicast traffic stream of Multicast Tunnel to be allocated address, identical with the PW member who records in a certain list item in the corresponding relation of the address, multicast group tunnel of BEB device storage and relative users multicast group information, then BEB equipment can be with the Multicast Tunnel address assignment that records in this list item to this multicast traffic stream.

It should be noted that, if the user multicast group information table that BEB equipment is determined self maintained is not when existing PW member in should the user multicast group information table of multicast traffic stream, then BEB equipment thinks that there is not the far-end recipient in this multicast traffic stream, does not need flow is transmitted to public network.In order to save Internet resources, BEB equipment stops the forwarding that this multicast packet flows to the public network side.

Wherein, if when also not having local port in this user multicast group information table, then BEB equipment thinks that this multicast traffic stream does not exist local and far-end recipient, and the BEB equipment directly processing of this multicast traffic stream is set to abandon and be issued to hardware; If have local port in this user multicast group information table, then BEB equipment thinks that there is local reception person in this multicast traffic stream, BEB equipment carries out local replica according to the local port member in the user multicast information table to multicast traffic stream, and transmits from corresponding port.

In determining the user multicast information table of self maintained, BEB equipment do not record the multicast group address and the VLAN Tag that carry in the literary composition of reporting for the first time of the multicast group that correspondence receives, and during the user multicast group information table of SPB instance number, BEB thinks that the data flow of this particular multicast group does not exist local and the far-end recipient, and BEB stops this locality forwarding of this multicast traffic stream and to the forwarding of public network side.

For avoiding or reduce the packet loss of the multicast traffic stream of above-mentioned particular multicast group, before setting up, can transmit by the mode of broadcast transmission in the SPB territory multicast transmit tree message of above-mentioned particular multicast group.

As a kind of specific implementation, when BEB equipment receives the multicast traffic stream that user's side enters, BEB equipment can also carry out multicast mac address according to this multicast traffic stream at the hardware forwarding plane and search in the SPB example, if this multicast mac address does not exist, illustrate that then this multicast group does not also create, need to carry out the multicast group creation operation, namely create for this multicast MAC and be used to indicate the multicast group list item that multicast traffic stream is broadcasted in the SPB example, no longer the subsequent packet transmitted to CPU is carried out the processing of above-mentioned steps 302-303 thereby SPB can broadcast the subsequent packet of this multicast traffic stream in the SPB territory.This BEB equipment is after finishing the multicast group establishment, can in the user multicast group information table of self maintained, inquire about corresponding list item, if do not inquire, then the data retransmission mode of this multicast traffic stream is set to abandon and be issued to hardware to upgrade the multicast group list item of aforementioned establishment, at this moment, the message of this multicast group can not continue to broadcast in the SPB territory; If in user multicast group information table, inquire corresponding list item, then can pass through above-mentioned steps 302-303, generation is to multicast transmit tree that should multicast traffic stream, and upgrade data retransmission mode in the multicast group list item of hardware forwarding plane according to multicast transmit tree, thereby the subsequent packet for this multicast traffic stream, can directly search the multicast group list item at hardware layer, and then be forwarded to the far-end that has multicast receivers.

Step 304, BEB equipment are transmitted the subsequent packet of this particular multicast group by this multicast transmit tree.

Further, in embodiments of the present invention, when the main frame of hanging under the BEB equipment withdraws from multicast group, in user multicast group information table corresponding to BEB unit deletion multicast group to local port that should main frame;

If this local port last local port for recording in this user multicast group information table, BEB equipment withdraws from described multicast group to the described BEB equipment of opposite end BEB devices advertise in the SPB example of correspondence so that in user multicast group information table corresponding to opposite end this multicast group of BEB unit deletion to PW that should BEB equipment.

BEB equipment is that corresponding multicast group is distributed new Multicast Tunnel address according to the user multicast group information table after upgrading;

BEB equipment is according to the user multicast group information table after upgrading, new Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the new multicast transmit tree that generates based on multicast source and multicast receivers, and transmit the subsequent packet of this particular multicast group by this new multicast transmit tree.

Can find out by above description, in the technical scheme that the embodiment of the invention provides, whether BEB equipment has the recipient of multicast group according to user's side and PW side, maintenance customer's multicast group information table, after BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, for this particular multicast group is distributed the Multicast Tunnel address, this Multicast Tunnel address comprises that the SPSourceID of this BEB equipment and this BEB equipment are the multicast address of this specific multicast set of dispense, and then according to the user multicast group information table of safeguarding, the Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the multicast transmit tree that generates based on multicast source and multicast receivers; BEB equipment is transmitted the subsequent packet of this particular multicast group by described multicast transmit tree, realized in the SPB territory, carrying out in example according to the recipient of reality the forwarding of multicast traffic stream, in the situation that does not have the far-end recipient, do not allow multicast traffic stream to enter public network, save Internet resources, improved the stability of a system.

Based on the inventive concept of said method embodiment system, the embodiment of the invention also provides a kind of BEB equipment, can be applied to said method embodiment.

As shown in Figure 4, the structural representation of a kind of BEB equipment that provides for the embodiment of the invention can comprise:

Maintenance module 41 is used for whether having according to user's side and PW side the recipient of multicast group, maintenance customer's multicast group information table;

Multicast Tunnel address administration module 42, be used for after described BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, for this particular multicast group is distributed the Multicast Tunnel address, this Multicast Tunnel address comprises that sign SPSourceID and this BEB equipment in the shortest path source of this BEB equipment are the multicast address of this specific multicast set of dispense;

Forwarding tree generation module 43, be used for the user multicast group information table according to described maintenance module 41 maintenances, the Multicast Tunnel address notification is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the multicast transmit tree that generates based on multicast source and multicast receivers;

Forwarding module 44 is for the subsequent packet of transmitting this particular multicast group by described multicast transmit tree.

Wherein, described maintenance module 41 specifically is used for,

Wherein, described maintenance module 41 also is used for,

Wherein, described Multicast Tunnel address administration module 42 specifically is used for, and according to the multicast group address that carries in the described literary composition of reporting for the first time and VLAN Tag, and the SPB instance number is inquired about described user multicast group information table; If record the multicast group address and the VLAN Tag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and have PW member in this list item, then described BEB equipment distributes the Multicast Tunnel address according to described PW member for this particular multicast group.

Wherein, described forwarding module 44 also is used for, if record the multicast group address and the VLAN Tag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and when not having PW member in this list item, stop the forwarding of the data flow public network side of this particular multicast group.

Wherein, described forwarding tree generation module 43 specifically is used for, by this BEB equipment and opposite end BEB equipment described Multicast Tunnel address and SPB instance number are encapsulated in the protocol massages and in described SPB network, flood, so that other equipment in described BEB equipment, opposite end BEB equipment and the described SPB network generate the multicast transmit tree based on multicast source and multicast receivers.

Wherein, described maintenance module 41 also is used for, and when the main frame of hanging under the described BEB equipment withdraws from multicast group, deletes in user multicast group information table corresponding to described multicast group local port that should main frame; If described local port last local port for recording in this user multicast group information table, the described BEB equipment of opposite end BEB devices advertise in the SPB example of correspondence withdraws from described multicast group so that in user multicast group information table corresponding to the described multicast group of described opposite end BEB unit deletion to PW that should BEB equipment.

Wherein, described Multicast Tunnel address administration module 42 also is used for, and is that corresponding multicast group is distributed new Multicast Tunnel address according to the user multicast group information table after upgrading;

Described forwarding tree generation module 43 also is used for, according to the user multicast group information table after upgrading, the Multicast Tunnel address notification that this is new is given the opposite end BEB equipment that has this particular multicast group recipient, and by in the SPB network, the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment, trigger the new multicast transmit tree that generates based on multicast source and multicast receivers;

Described forwarding module 44 also is used for, and transmits the subsequent packet of this particular multicast group by this new multicast transmit tree.

Wherein, described Multicast Tunnel address administration module 42 specifically is used for, and be the multicast group address difference of correspondence, but the identical multicast traffic stream of PW member distributes identical Multicast Tunnel address.

It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.

Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode in a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a station terminal equipment (can be mobile phone, personal computer, server, perhaps two-layer switching equipment etc.) carry out the described method of each embodiment of the present invention.

The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.

Claims

1. a muticast data transmission method is applied to the backbone network edge bridges BEB equipment in the shortest path bridge SPB network, it is characterized in that the method comprises:

2. the method for claim 1 is characterized in that, whether described BEB equipment has the recipient of multicast group according to user's side and PW side, and maintenance customer's multicast group information table comprises:

3. method as claimed in claim 2 is characterized in that, whether described BEB equipment has the recipient of multicast group according to user's side and PW side, and maintenance customer's multicast group information table also comprises:

4. the method for claim 1 is characterized in that, after described BEB equipment is received the literary composition of reporting for the first time of particular multicast group from user's side joint, distributes the Multicast Tunnel address for this particular multicast group, is specially:

5. method as claimed in claim 4 is characterized in that, the method also comprises:

6. the method for claim 1, it is characterized in that, described BEB equipment triggers the multicast transmit tree that generates based on multicast source and multicast receivers by the flood link-state information of this Multicast Tunnel address of this BEB equipment and opposite end BEB equipment in the SPB network, be specially:

7. the method for claim 1 is characterized in that, the method also comprises:

8. method as claimed in claim 7 is characterized in that, the method also comprises:

9. such as each described method of claim 1-8, it is characterized in that,

Described BEB equipment is corresponding multicast group address difference, but the identical multicast traffic stream of PW member distributes identical Multicast Tunnel address.

10. a backbone network edge bridges BEB equipment is applied to shortest path bridge SPB network, it is characterized in that this BEB equipment comprises:

11. BEB equipment as claimed in claim 10 is characterized in that described maintenance module specifically is used for,

12. BEB equipment as claimed in claim 11 is characterized in that described maintenance module also is used for,

13. BEB equipment as claimed in claim 10 is characterized in that,

Described Multicast Tunnel address administration module specifically is used for, and according to the multicast group address that carries in the described literary composition of reporting for the first time and VLAN Tag, and the SPB instance number is inquired about described user multicast group information table; If record the multicast group address and the VLAN Tag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and have PW member in this list item, then described BEB equipment distributes the Multicast Tunnel address according to described PW member for this particular multicast group.

14. BEB equipment as claimed in claim 13 is characterized in that,

Described forwarding module also is used for, if record the multicast group address and the VLAN Tag that carry in the corresponding described literary composition of reporting for the first time in the described user multicast group information table, and the user multicast group information table of SPB instance number, and when not having PW member in this list item, stop the forwarding of the data flow public network side of this particular multicast group.

15. BEB equipment as claimed in claim 10 is characterized in that,

Described forwarding tree generation module specifically is used for, by this BEB equipment and opposite end BEB equipment described Multicast Tunnel address and SPB instance number are encapsulated in the protocol massages and in described SPB network, flood, so that other equipment in described BEB equipment, opposite end BEB equipment and the described SPB network generate the multicast transmit tree based on multicast source and multicast receivers.

16. BEB equipment as claimed in claim 10 is characterized in that,

Described maintenance module also is used for, and when the main frame of hanging under the described BEB equipment withdraws from multicast group, deletes in user multicast group information table corresponding to described multicast group local port that should main frame; If described local port last local port for recording in this user multicast group information table, the described BEB equipment of opposite end BEB devices advertise in the SPB example of correspondence withdraws from described multicast group so that in user multicast group information table corresponding to the described multicast group of described opposite end BEB unit deletion to PW that should BEB equipment.

17. BEB equipment as claimed in claim 16 is characterized in that,

Described Multicast Tunnel address administration module also is used for, and is that corresponding multicast group is distributed new Multicast Tunnel address according to the user multicast group information table after upgrading;

18. such as each described BEB equipment of claim 10-17, it is characterized in that,

Described Multicast Tunnel address administration module specifically is used for, and be the multicast group address difference of correspondence, but the identical multicast traffic stream of PW member distributes identical Multicast Tunnel address.