CN102412976B

CN102412976B - Method and device for processing multicase messages in provider backbone bridge (PBB) network

Info

Publication number: CN102412976B
Application number: CN201010291568.5A
Authority: CN
Inventors: 宋小恒
Original assignee: Hangzhou H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2010-09-25
Filing date: 2010-09-25
Publication date: 2014-05-07
Anticipated expiration: 2030-09-25
Also published as: CN102412976A

Abstract

The invention provides a method and a device for processing multicase messages in a provider backbone bridge (PBB) network. The method is characterized in that: only backbone edge bridge (BEB) equipment which a multicase resource locates in allocates a public network multicase address to a private network multicase address and publishes the public network multicase address in a PBB example, so that a uniform mapping relationship between the private network multicase address and the public network multicase address exists on each BEB in the PBB network; meanwhile, only the BEB equipment having the mapping relationship can use a received Internet group management protocol (IGMP) added the message to form a public network multicase forwarding list; and thus, one private network multicase address only corresponds to one public network multicase forwarding list on each BEB equipment, and because only the BEB equipment on a multicase effective path can establish the public network multicase forwarding list, the generation of redundant multicase traffic is avoided.

Description

The method and apparatus of processing multicast message in a kind of provider backbone bridging network

Technical field

The present invention relates to network communications technology field, particularly the method and apparatus of processing multicast message in a kind of provider backbone bridging (PBB) network.

Background technology

MinM (MAC-in-MAC) agreement is defined by IEEE 802.1ah, is called again provider backbone bridging (PBB, Provider Backbone Bridge) agreement.As a kind of two-layer virtual private network (VPN, Virtual Private Network) technology, it is nested by MAC Address, user's MAC address is encapsulated among operator's MAC Address, thereby different customer services is isolated.

As shown in Figure 1, in a typical PBB network, generally include two kind equipments: backbone network core bridge joint (BCB, Backbone Core Bridge) equipment and backbone network edge bridge joint (BEB, BackboneEdge Bridge) equipment.Wherein, BEB equipment is responsible for from the message of line attachment (AC), carrying out sending to follow-up BCB equipment after MinM encapsulation, and the MinM message from BCB equipment is carried out to decapsulation be reduced into standard ethernet message, again table look-up and find corresponding outbound port to send.BCB equipment is responsible for the MinM message of receiving according to outer MAC label forwarding.On BCB equipment, only need to carry out simple bridge joint processing to message, MAC Address in study backbone network, and do not need to learn a large amount of MAC Address in customer network, thereby reduce the cost of network design, and provide better extensibility for PBB network.

It is mainly the unicast service based on MinM tunnel that MinM technology provides Ethernet transport service, for multicast service, mainly has at present two kinds of methods:

First method: directly multicast message is processed as broadcast, message will be broadcasted in the MinM territory of PBB network.

Second method: CE equipment sends to coupled BEB equipment the private network multicast group that the IGMP request of joining message adds appointment; After this BEB equipment receives IGMP and joins message, distribute public network multicast address also to set up public network multicast address and the mapping relations of private network multicast address, and IGMP is joined message and expands to the IGMP expansion of carrying private network multicast address and public network multicast address and join message and send to multicast source place BEB equipment by BCB equipment.IGMP joins message in repeating process, sets up transmitting of public network multicast address on the way.After multicast source place BEB equipment receives IGMP expansion and joins message, set up public network multicast address and transmit, and set up the mapping relations of public network multicast address and private network multicast address; The BEB equipment at multicast source place joins message IGMP expansion to revert to and after IGMP joins message, is transmitted to multicast source place CE equipment.

In above-mentioned first kind of way, multicast message is used as to broadcasting packet and is processing, multicast message is broadcasted in PBB example, does not have the BEB equipment of multicast receivers also can receive multicast message, and forward the packet to all CE equipment in this locality, caused the bandwidth waste of PBB public network and user private network.

In the second way, although there is not the problem of broadcast, if but while all there is the recipient CE of private network multicast address under different BEB equipment, each BEB equipment will distribute public network multicast address and set up the mapping relations of mapping private network multicast group and public network address, the IGMP expansion after expansion is joined message and is broadcasted in PBB BVLAN simultaneously.Arrive after the BEB equipment at multicast source place, multicast source place BEB equipment can receive many parts of IGMP expansions and join message, if the public network multicast address that each BEB distributes is not identical, on the BEB equipment at multicast source place, will create the mapping of unified private network multicast address to multiple public network multicast address, on PBB BVLAN public network, can set up transmitting of multiple public network multicast address simultaneously.This will bring following defect: the BEB equipment at multicast source place receives after the multicast message from AC, multiple public network multicast address that can be corresponding according to private network multicast address, multicast message is encapsulated to many parts, and send to public network according to public network multicast address, follow-up like this BEB equipment just may receive many parts of flux of multicast, corresponding CE recipient also can receive many parts of flux of multicast, and this is obviously that user is unacceptable.

Simultaneously, if respectively receive the BEB equipment of private network multicast IGMP message, initiatively distribute public network multicast address, can be very easy to expend public network multicast address resource, without any flux of multicast in the situation that, public network side just may have been set up a large amount of public network multicast address and transmitted, the invalid use that has caused public network Multicast Tunnel and public network multicast address to transmit.

Summary of the invention

The invention provides the method and apparatus of processing multicast message in a kind of PBB network, so that avoid the flux of multicast of redundancy in PBB network.

A method for processing multicast message in provider backbone bridging PBB network, the method comprises:

Backbone network edge bridge joint BEB equipment receives in PBB example when the private network multicast Internet Group Management Protocol IGMP from local user's network edge CE equipment joins message, by receiving the interface that joins message of described private network multicast IGMP, add in described PBB example this private network multicast IGMP private network multicast forward table corresponding to entrained private network multicast address that join message, and in described PBB example, broadcast carry PBB instance number in described private network multicast IGMP joins message after;

From PBB network, receive the BEB equipment that described private network multicast IGMP joins message and preserve triplet information, in this triplet information, comprise: described PBB instance number, described private network multicast address and receive the PW information that described private network multicast IGMP joins message;

Receive the BEB equipment of the multicast data flow corresponding from the described private network multicast address of local CE, if local, there is not the public network multicast forward table of the public network multicast address that described private network multicast address is assigned with, described multicast data flow is broadcasted in described PBB example, and be that described private network multicast address distributes public network multicast address, record the mapping relations of described private network multicast address and described public network multicast address, and send according to the described triplet information of local record the multicast domain MD message that carries described private network multicast address and public network multicast address;

Receive the mapping relations of private network multicast address and public network multicast address described in the BEB equipment records of described MD message, and while there is the private network multicast forward table of described private network multicast address in this locality, to the BEB equipment at multicast source place, send the public network multicast IGMP that carries described public network multicast address and join message;

If receive the BEB equipment that described public network multicast IGMP joins message, record described mapping relations, set up or upgrade the public network multicast forward table of described public network multicast address.

A kind of backbone network edge bridge joint BEB equipment, this BEB equipment comprises: user's side Transmit-Receive Unit, private network multicast table maintenance unit, network side Transmit-Receive Unit, tlv triple are set up unit, first and judged that processing unit, public network address allocation units, second judge that processing unit, the 3rd judges processing unit and public network multicast table maintenance unit;

Described user's side Transmit-Receive Unit, for after receiving provider backbone bridging PBB example and joining message from the private network multicast IGMP of local user's network edge CE equipment, this private network multicast IGMP is joined message to the private network multicast address that carries by adding notice to send to private network multicast table maintenance unit; Receive after the multicast data flow from local CE equipment, private network multicast address corresponding multicast data flow is offered to the first judgement processing unit;

Described private network multicast table maintenance unit, for utilizing the private network multicast address that adds notice to carry receiving, the interface that described reception user's side Transmit-Receive Unit reception private network multicast IGMP is joined message adds the private network multicast forward table that described private network multicast address is corresponding;

Described network side Transmit-Receive Unit, in described PBB example broadcasts after carrying described PBB example for joining message at described private network multicast IGMP; From PBB network receives private network multicast IGMP and joins message, the PBB instance number of carrying during private network multicast IGMP is joined message and private network multicast address offer tlv triple and set up unit; Receive after the mapping relations that described public network address allocation units provide, according to described tlv triple, set up the triplet information of unit record, send and carry the private network multicast address of these mapping relations and the multicast domain MD message of public network multicast address; Receive after MD message, the private network multicast address carrying and public network multicast address are offered to described public network address allocation units and second judge processing unit in MD message; To the BEB equipment at multicast source place, send described second and judge that the public network multicast IGMP that processing unit provides joins message; After receiving public network multicast IGMP and joining message, the public network multicast address carrying during public network multicast IGMP is joined message offers the 3rd and judges processing unit;

Described tlv triple is set up unit, for utilizing the PBB instance number and the private network multicast address that receive to preserve triplet information, in this triplet information, comprise: PBB instance number, private network multicast address and described network side Transmit-Receive Unit receive the PW information that private network multicast IGMP joins message;

Described first judges processing unit, for receiving after the private network multicast address that described user's side Transmit-Receive Unit provides, judge whether this BEB equipment this locality has existed the public network multicast forward table of the public network multicast address that this private network multicast address is assigned with, if not, to public network address allocation units, send and distribute notice;

Described public network address allocation units, be used for receiving and distribute after notice, for the private network multicast address of described multicast data flow distributes public network multicast address, and record the mapping relations of private network multicast address and public network multicast address, these mapping relations are offered to described network side Transmit-Receive Unit; Record public network multicast address that described network side Transmit-Receive Unit provides and the mapping relations of private network multicast address;

Described second judges processing unit, for judging whether this BEB equipment this locality exists described network side Transmit-Receive Unit that the private network multicast forward table of the private network multicast address coming is provided, if so the public network multicast address, described network side Transmit-Receive Unit being provided is carried at public network multicast IGMP and sends to network side Transmit-Receive Unit in joining message;

The described the 3rd judges processing unit, for judging whether the public network multicast address that described network side Transmit-Receive Unit provides is present in the mapping relations that described public network address allocation units record, if exist, this public network multicast address offered to public network multicast table maintenance unit;

Described public network multicast table maintenance unit, for setting up or upgrade the public network multicast forward table of the public network multicast address receiving.

As can be seen from the above technical solutions, by method provided by the invention, the BEB equipment that only has multicast source place is that private network multicast address distributes public network multicast address, and this public network multicast address is issued in PBB example, make to exist on the each BEB in PBB network the mapping relations between unified private network multicast address and public network multicast address, thereby make on each BEB equipment a private network multicast address only a corresponding public network multicast address transmit, according to public network multicast address transmit carry out flux of multicast forward time, can not produce redundant broadcast flow.

In addition, in the present invention, public network multicast address is in issuing process, each BEB equipment in PBB example can record the mapping relations between private network multicast address and public network multicast address, the public network multicast IGMP receiving in utilization joins message while forming public network multicast forward table, only have the BEB equipment of the mapping relations of existing just can set up public network multicast forward table, thereby guaranteed to only have the BEB equipment on multicast active path just can set up public network multicast forward table, further avoided the generation of redundancy flux of multicast.

Accompanying drawing explanation

Fig. 1 is a typical PBB multicast schematic diagram;

Fig. 2 is main method flow chart provided by the invention;

Fig. 3 is the inundation process flow diagram of private network multicast IGMP message;

Fig. 4 is the IGMP message format schematic diagram after expansion;

Fig. 5 is network implementation illustration corresponding to flow process shown in Fig. 3;

Fig. 6 is the issue of public network multicast address and the forming process flow chart of public network multicast forward table;

Fig. 7 is network implementation illustration corresponding to flow process shown in Fig. 6;

Fig. 8 is the structural representation of BEB equipment provided by the invention.

Embodiment

In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the drawings and specific embodiments, describe the present invention.

Main method provided by the invention can as shown in Figure 2, mainly comprise the following steps:

Step 201:BEB equipment receives in PBB example when the private network multicast IGMP from local CE equipment joins message, by receiving interface that this private network multicast IGMP joins message, add in PBB example this private network multicast IGMP private network multicast forward table corresponding to entrained private network multicast address that join message, and in PBB example, broadcast carry PBB instance number in private network multicast IGMP joins message after.

Step 202: receive from PBB network the BEB equipment preservation triplet information that private network multicast IGMP joins message, comprise in this triplet information: the PW information that PBB instance number, private network multicast address and reception private network multicast IGMP join message.

Step 203: the BEB equipment that receives the multicast data flow corresponding from the above-mentioned private network multicast address of local CE, if local, do not exist private network multicast address the public network multicast forward table of corresponding public network multicast address, this multicast data flow is broadcasted in PBB example, and be that this private network multicast address distributes public network multicast address, record the mapping relations of private network multicast address and public network multicast address, and send according to the triplet information of record the MD message that carries private network multicast address and public network multicast address.

If local, existed private network multicast address the public network multicast forward table of corresponding public network multicast address, according to public network multicast forward table corresponding to this private network multicast address, forward.

Step 204: receive the BEB equipment records private network multicast address of MD message and the mapping relations of public network multicast address, and while there is the private network multicast forward table of this private network multicast address in this locality, to the BEB equipment at multicast source place, send the public network multicast IGMP that carries public network multicast address and join message.

Step 205: have if receive the BEB equipment that public network multicast IGMP joins message the mapping relations that comprise this public network multicast address, set up or upgrade the public network multicast forward table of this public network multicast address.

In addition, the BEB equipment at multicast source place is utilizing said method to set up after public network multicast forward table, just the above-mentioned multicast data flow receiving can be switched on the public network multicast transmit tree that the public network multicast forward table of above-mentioned foundation is corresponding, thereby follow-up multicast data flow can be forwarded according to public network multicast forwarding path.

In fact, said method provided by the invention can be decomposed into several concrete processes: 1) the inundation process of private network multicast IGMP message; 2) forming process of the issue of public network multicast address and public network multicast forward table; 3) repeating process of flux of multicast.Below the said process after decomposing is described in detail respectively.

Fig. 3 is the inundation process flow diagram of private network multicast IGMP message, and as shown in Figure 3, this process can specifically comprise the following steps:

Step 301:BEB equipment receives in certain PBB example after the private network multicast IGMP from local CE equipment joins message, judge whether this BEB equipment this locality has existed the join message private network multicast forward table of entrained private network multicast address of this private network multicast IGMP in this PBB example, if there is no, execution step 302; If existed, execution step 303.

Step 302: the private network multicast forward table of above-mentioned private network multicast address in this PBB example is set up in this BEB equipment this locality, execution step 303.

Step 303: the incoming interface that reception private network multicast IGMP is joined message adds in the outgoing interface list that this private network multicast address is corresponding.

Step 304: this PBB example information is carried at during this private network multicast IGMP joins message, and the private network multicast IGMP that carries PBB example information is joined message and broadcasted in this PBB example.

More preferably, step 304 can just be carried out when only having private network multicast address not exist.

In this step, can private network multicast IGMP be joined message and be expanded, by extended field, carry PBB example information, IGMP message format after expansion can be as shown in Figure 4, wherein, multicast group address field is used for carrying private network multicast address, and instance number (I-SID) field is extended field, for carrying PBB example information.This private network multicast IGMP joins message while broadcasting in this PBB example, carries out sending to after MinM encapsulation all opposite ends BCB equipment of this PBB example.

The private network multicast IGMP that step 305:BCB equipment interconnection is received joins message and carries out transparent transmission.

It is the message that has encapsulated MinM tunnel head that the private network multicast IGMP receiving due to BCB equipment joins message, and BCB equipment can not resolved this message, only carries out forward process.

Step 306: after other BEB equipment receives private network multicast IGMP and joins message from PBB network, preserve PBB example, private network multicast address and receive the corresponding relation between the PW information that this private network multicast IGMP joins message.

After BEB equipment receives that BCB equipment transparent transmission comes or private network multicast IGMP that other BEB equipment sends and joins message, separate MinM encapsulation, then the message after decapsulation is resolved, obtain the PBB example information and the private network multicast address that wherein carry, in a tlv triple (instance number of this locality storage, private network multicast address, receive the PW information that this private network multicast IGMP joins message), this tlv triple, for the issuing process of follow-up public network multicast address, will relate in subsequent descriptions.

For a specific example flow process shown in Fig. 3 is described below.Take the network architecture shown in Fig. 5 as example, the CE11 in hypothesis instance PBB1 sends private network multicast IGMP to BEB1 and joins message, and it is the private network multicast group of 224.1.1.1 that request adds private network multicast address.

After BEB1 receives this private network multicast IGMP and joins message, in this locality, set up the private network multicast forward table of 224.1.1.1 under PBB1, incoming interface is added to the outgoing interface list that in private network multicast forward table, 224.1.1.1 is corresponding.BEB1 is carried at the instance number of PBB1 in the extended field that private network multicast IGMP joins message and broadcasts in PBB1 example.

It should be noted that, BEB equipment, all need to carry out MinM encapsulation when PBB network sends message, when BEB equipment receives message from PBB equipment, all needs to carry out MinM decapsulation, because this process is prior art, in subsequent embodiment, repeats no longer one by one.

Suppose that BCB2 and BCB1 are the opposite equip.s of the PBB1 example of BEB1, BCB1 joins message this private network multicast IGMP to carry out transparent transmission, passes through BEB2, and BCB2 joins message this private network multicast IGMP to carry out transparent transmission, passes through BEB4.

BEB4 obtains instance number PBB1 and private network multicast address 224.1.1.1 from the private network multicast IGMP receiving joins message, and set up tlv triple (PBB1,224.1.1.1, BEB1), in this tlv triple, receive PW information that private network multicast IGMP joins message with PW to bringing in sign, in PBB network, be equivalent to source MAC, PW opposite end is BEB1.In like manner, on BEB3, set up tlv triple (PBB1,224.1.1.1, BEB4).On BEB2, there is two tlv triple (PBB1,224.1.1.1, BEB1) and (PBB1,224.1.1.1, BEB4).

After the inundation process joining message through above-mentioned private network multicast IGMP, the private network multicast group address information that all exists recipient to add on each BEB equipment in PBB example, i.e. PBB example information, private network multicast group address and receive the corresponding relation between the PW information that this private network multicast IGMP joins message.

Fig. 6 is the issue of public network multicast address and the forming process flow chart of public network multicast forward table, and as shown in 6, this process can specifically comprise the following steps:

When step 601:BEB equipment receives from the multicast data flow of local CE equipment, judge whether this BEB equipment has existed the public network multicast forward table corresponding to private network multicast address of this multicast data flow, if so, execution step 602; Otherwise, execution step 603.

Step 602: the public network multicast forward table corresponding according to the private network multicast address of this multicast data flow forwards this multicast data flow, finishes the forwarding process of this BEB equipment.

If there is the public network multicast forward table corresponding to private network multicast address of this multicast data flow in BEB equipment this locality, explanation is not the multicast data flow that receives first this private network multicast address, directly according to public network multicast forward table, forwards.

In addition, it should be noted that, if receive the multicast data flow from local CE equipment, also can inquire about the local private network multicast forward table that whether has the private network multicast address that comprises this multicast data flow, determine whether to exist local multicast stream recipient, if existed, copy the multicast data flow that flows recipient's equal parts with local multicast, according to local private network multicast forward table, be transmitted to local multicast stream recipient.

Step 603: this multicast data flow is broadcasted in corresponding PBB example.

If not yet there is the public network multicast forward table corresponding to private network multicast address of this multicast data flow in BEB equipment this locality, explanation receives the multicast data flow of this private network multicast address first, need in PBB network, carry out the distribution of public network multicast address and the foundation of public network multicast forward table.

Step 604: if be not yet the private network multicast address distribution public network multicast address of this multicast data flow, be that this private network multicast address distributes a public network multicast address, record the mapping relations between private network multicast address and public network multicast address, and in this PBB example according to PW information broadcasting multicast domain (MD corresponding to private network multicast address, Multicast Domain) message, carries the public network multicast address information of private network multicast address and distribution in this MD message.

In the inundation process joining message at private network multicast IGMP, on each BEB equipment in PBB example, all preserve PBB example, private network multicast address and received the corresponding relation between the PW information that this private network multicast IGMP joins message, when sending MD message, just according to PW corresponding to this private network multicast address, send.

Step 605: when other each BEB equipment receives MD message from PBB network, from this MD message, parse private network multicast address and the public network multicast address for this private network multicast address distribution, record the mapping relations between private network multicast address and public network multicast address.

Step 606: judge the local private network multicast forward table that this private network multicast address is corresponding that whether exists, if existed, perform step 607; If there is no, abandon this MD message.

Step 607: the public network multicast IGMP that carries the public network multicast address parsing to the BEB equipment transmission at multicast source place joins message.

In this step, can be in public network with mode of unicast, to the BEB equipment at multicast source place, send public network multicast IGMP and join message, this is mode preferably, also can in PBB example, broadcast this public network multicast IGMP and join message.

After step 608:BCB equipment receives this public network multicast IGMP and joins message, set up public network multicast forward table, be about to receive the interface that this public network multicast IGMP joins message and add the outgoing interface list that this public network multicast address is corresponding, then continue to join message to this public network multicast of BEB device forwards IGMP at multicast source place.

It should be noted that, above-mentioned private network IGMP joins message and MD message is all messages of MinM encapsulation, and therefore, BCB all carries out transparent transmission processing.And in the present invention, public network multicast IGMP joins message and does not adopt the message of MinM encapsulation, but common message, therefore, after BCB equipment receives this public network multicast IGMP and joins message, can utilize this public network multicast IGMP to join message and set up public network multicast forward table.

Step 609: after other BEB equipment receives this public network multicast IGMP and joins message, set up the public network multicast forward table of this public network multicast address in this locality, and continue to forward this IGMP and join message until the BEB equipment at multicast source place.

Set up the public network multicast forward table of this public network multicast address, be about to receive the interface that public network multicast IGMP joins message and add the outgoing interface list that this public network multicast address is corresponding.

Like this, from the BEB equipment at the recipient place of multicast message until the BEB equipment at multicast source place, and on the BCB equipment in RX path, all set up public network multicast forward table.

When with after having carried out inundation that private network multicast IGMP joins message shown in Fig. 5, if BEB2 equipment connection multicast source, suppose that multicast source is local CE21, when BEB2 receives the multicast data flow of multicast source transmission, as shown in Figure 7, BEB2 not yet sets up at PBB the public network multicast forward table that 224.1.1.1 is corresponding for 1 time in definite this locality, this multicast data flow is broadcasted under PBB1, meanwhile, for 224.1.1.1 distributes a public network multicast address 239.1.1.1, record mapping relations between the two, and according to the tlv triple of preserving in inundation process, send the MD message of carrying 224.1.1.1 and 239.1.1.1.

BEB3 and BEB1 receive after this MD message, preserve the mapping relations between 224.1.1.1 and 239.1.1.1.

Owing to there is the recipient of this multicast data flow under BEB1, in this locality, there is the private network multicast forward table that 224.1.1.1 is corresponding, therefore can reply the public network multicast IGMP that carries 239.1.1.1 to the BEB2 at multicast source place and join message.More preferably, this public network multicast IGMP joins message and sends with clean culture form, if searched, transmits the list item that obtains coupling, with clean culture form, sends to BEB2, supposes as shown in Figure 7, and BEB1 joins message public network multicast IGMP to send to BCB1; If BEB1 searches forwarding-table item and does not obtain the list item mating, in PBB example, broadcast this public network multicast IGMP join message (BCB1 and BCB2 all can receive that this public network multicast IGMP joins message, and BCB2 joins message this public network multicast IGMP, and to be sent to the mode of BEB2 identical with BCB1).In Fig. 7, BEB1 sends public network multicast IGMP with clean culture form and joins message as example.It should be noted that, in PBB network, can avoid for public network multicast enabled the mechanism of loop, for example enable MSTP mechanism, even if BEB2 equipment can receive public network multicast IGMP from mulitpath and joins message like this, just BEB2 also can choose one and set up public network multicast transmit tree, and this part is current mechanism, is no longer described in detail.

After BCB1 receives public network multicast IGMP and joins message, set up the public network multicast forward table that 239.1.1.1 is corresponding, and continue to forward this public network multicast IGMP with clean culture form and join message.

After BEB2 receives public network multicast IGMP and joins message, owing to there are the mapping relations between 224.1.1.1 and 239.1.1.1 in this locality, therefore, in this locality, set up the public network multicast forward table that 239.1.1.1 is corresponding.Now, just multicast data flow can be switched on the multicast transmit tree that public network multicast forward table is corresponding, start to carry out according to public network multicast forward table the forwarding of multicast data flow.

In Fig. 7, dotted arrow is the transmit path of MD message, and solid arrow is the transmit path that public network multicast IGMP joins message.

The repeating process of follow-up flux of multicast can be: according to the public network multicast forward table of setting up, forward, by broadcast transmission, transfer multicast to and send.That is, each BEB equipment and BCB equipment receive after multicast data flow, and the public network multicast forward table corresponding according to the private network multicast address of this multicast data flow carries out message repeating; Meanwhile, if BEB equipment exists private network multicast forward table corresponding to multicast data flow in this locality, illustrate in this locality and there is recipient, according to local private network multicast forward table, be transmitted to local CE equipment after multicast data flow being copied to portion.

If after public network multicast forward table is set up, under BEB4, there is new multicast receivers, for example CE41 request adds the private network multicast group of 224.1.1.1, after BEB4 receives private network multicast IGMP that CE41 sends and joins message, sets up private network multicast forward table in this locality.In addition, because BEB4 this locality has existed the mapping relations between 224.1.1.1 and public network multicast address 239.1.1.1, the public network multicast IGMP that BEB4 can directly carry 239.1.1.1 with mode of unicast to BEB2 transmission joins message, thereby in outgoing interface list corresponding to 239.1.1.1, increase interface, flux of multicast is caused to CE41.That is to say, receive the BEB equipment joining message from the private network multicast IGMP of local CE, can first judge the local mapping relations that comprise this private network multicast address that whether existed, if existed, to the BEB equipment at multicast source place, send the public network multicast IGMP that carries public network multicast address in these mapping relations and join message; If there is no, according to the flow process in Fig. 3, start to set up private network multicast forward table.

If certain multicast data flow recipient need to exit private network multicast group, can send private network multicast IGMP leave message to the BEB equipment connecting, in this private network multicast IGMP leave message, comprise the private network multicast address that will exit.

BEB equipment receives after private network multicast IGMP leave message, upgrades private network multicast forward table, and the incoming interface that is about to receive this private network multicast IGMP leave message is deleted from outgoing interface list corresponding to private network multicast address.When outgoing interface list corresponding to this private network multicast address is sky, deletes the private network multicast forward table of this private network multicast address, and send public network multicast IGMP leave message to the BEB equipment at multicast source place.Equally, can send this public network multicast IGMP leave message with the form of clean culture, also can in PBB example, broadcast this public network multicast IGMP leave message with the form of broadcast, this joins message similar to public network multicast IGMP.

Other BEB equipment receives after private network multicast IGMP leave message, has private network multicast forward table corresponding to this private network multicast address, the tlv triple of deleting local this private network multicast address of preserving if local.If receive public network multicast IGMP leave message, the incoming interface that receives this public network multicast IGMP leave message is deleted from public network multicast forward table corresponding to public network multicast address.Multicast data flow just can not be forwarded to and there is no the BEB of multicast receivers equipment like this.

In addition, when the PBB example state on BEB equipment is when UP becomes DOWN, need in this PBB example, broadcast the public network multicast IGMP leave message of all public network multicast address under this PBB example.

Be more than the detailed description that method provided by the present invention is carried out, below BEB equipment provided by the present invention be described in detail.

Fig. 8 is the structural representation of BEB equipment provided by the invention, as shown in Figure 8, this BEB equipment can comprise: user's side Transmit-Receive Unit 800, private network multicast table maintenance unit 801, network side Transmit-Receive Unit 802, tlv triple are set up unit 803, first and judged that processing unit 804, public network address allocation units 805, second judge that processing unit 806, the 3rd judges processing unit 807 and public network multicast table maintenance unit 808.

User's side Transmit-Receive Unit 800, for after receiving PBB example and joining message from the private network multicast IGMP of local CE equipment, joins message the private network multicast address that carries by adding notice to send to private network multicast table maintenance unit 801 by this private network multicast IGMP; Receive after the multicast data flow from local CE equipment, private network multicast address corresponding multicast data flow is offered to the first judgement processing unit 804.

Private network multicast table maintenance unit 801, for utilize receive add the private network multicast address that carries of notice, by receiving user's side Transmit-Receive Unit 800, receive the interface that private network multicast IGMP joins message and add the private network multicast forward table that described private network multicast address is corresponding.

Network side Transmit-Receive Unit 802, in PBB example broadcasts after carrying PBB example for joining message at private network multicast IGMP; From PBB network receives private network multicast IGMP and joins message, the PBB instance number of carrying during private network multicast IGMP is joined message and private network multicast address offer tlv triple and set up unit 803; Receive after the mapping relations that public network address allocation units 805 provide, according to tlv triple, set up the triplet information that unit 803 records, send and carry the private network multicast address of these mapping relations and the multicast domain MD message of public network multicast address; Receive after MD message, the private network multicast address carrying and public network multicast address are offered to public network address allocation units 805 and second judge processing unit 806 in MD message; To the BEB equipment at multicast source place, send second and judge that the public network multicast IGMP that processing unit 806 provides joins message; After receiving public network multicast IGMP and joining message, the public network multicast address carrying during public network multicast IGMP is joined message offers the 3rd and judges processing unit 807.

Tlv triple is set up unit 803, for utilizing the PBB instance number and the private network multicast address that receive to preserve triplet information, in this triplet information, comprise: PBB instance number, private network multicast address and network side Transmit-Receive Unit 802 receive the PW information that private network multicast IGMP joins message.

First judges processing unit 804, for receiving after the private network multicast address that user's side Transmit-Receive Unit 800 provides, judge whether this BEB equipment this locality has existed the public network multicast forward table of the public network multicast address that this private network multicast address is assigned with, if not, to public network address allocation units 805, send and distribute notice.

Public network address allocation units 805, be used for receiving and distribute after notice, for the private network multicast address of multicast data flow distributes public network multicast address, and record the mapping relations of private network multicast address and public network multicast address, these mapping relations are offered to network side Transmit-Receive Unit 802; Record public network multicast address that network side Transmit-Receive Unit 802 provides and the mapping relations of private network multicast address.

Second judges processing unit 806, for judging whether this BEB equipment this locality exists network side Transmit-Receive Unit 802 that the private network multicast forward table of the private network multicast address coming is provided, if so the public network multicast address, network side Transmit-Receive Unit 802 being provided is carried at public network multicast IGMP and sends to network side Transmit-Receive Unit 802 in joining message.

The 3rd judges processing unit 807, for judging whether the public network multicast address that network side Transmit-Receive Unit 802 provides is present in the mapping relations that public network address allocation units 805 record, if exist, this public network multicast address offered to public network multicast table maintenance unit 808.

Public network multicast table maintenance unit 808, for setting up or upgrade the public network multicast forward table of the public network multicast address receiving.

In addition, first judges processing unit 804, if can also be used for judging this BEB equipment this locality and existed the public network multicast forward table of the public network multicast address that this private network multicast address is assigned with, to network side Transmit-Receive Unit 802 transmitted traffics, forwards notice.

Network side Transmit-Receive Unit 802, also, for receiving after traffic forwarding notice, the public network multicast forward table corresponding according to the private network multicast address of flux of multicast forwards.

Particularly, above-mentioned private network multicast table maintenance unit 801 can comprise: the first judgment sub-unit 8011 and private network multicast table are safeguarded subelement 8012.

The first judgment sub-unit 8011, for receiving, carry the adding after notice of private network multicast address, judge whether to set up the private network multicast forward table of this private network multicast address in PBB example, if not, to private network multicast table, safeguard that subelement 8012 sends foundation notice; If so, to private network multicast maintenance subelement 8012, send update notification.

Private network multicast table is safeguarded subelement 8012, be used for receiving and set up after notice, set up the private network multicast forward table of this private network multicast address in PBB example, and user's side Transmit-Receive Unit 800 is received to the interface that private network multicast IGMP joins message add private network multicast forward table; Receive after update notification, user's side Transmit-Receive Unit 800 is received to the interface that private network multicast IGMP joins message and add private network multicast forward table.

Further, second judges processing unit 806, and also when the private network multicast forward table of private network multicast address that does not exist network side Transmit-Receive Unit 802 to provide is provided, informing network side Transmit-Receive Unit 802 abandons the MD message receiving.

The 3rd judges processing unit 807, while not also being present in for the public network multicast address of judging network side Transmit-Receive Unit 802 and providing the mapping relations that public network address allocation units 805 record, informing network side Transmit-Receive Unit 802 joins message the public network multicast IGMP receiving to continue the BEB device forwards to multicast source place.

More preferably, this BEB equipment can also comprise: the 4th judges processing unit 809, for receiving user's side Transmit-Receive Unit 800, offer the notice that adds of private network multicast table maintenance unit 801, judging whether public network address allocation units 805 have been set up comprises this and adds the mapping relations of notifying entrained private network multicast address, if there is no, will add notice to be transmitted to private network multicast table maintenance unit 801; If existed, public network multicast address corresponding in the mapping relations that comprise this private network multicast address of having set up is carried at during public network multicast IGMP joins message, this public network multicast IGMP is joined message and offers network side Transmit-Receive Unit 802.

Network side Transmit-Receive Unit 802, also for judging that by the 4th the public network multicast IGMP that processing unit 809 provides joins message to the BEB device forwards at multicast source place.

This BEB equipment also comprises: flow switch unit 811, for setting up after public network multicast forward table at public network multicast table maintenance unit 808, will be switched on the public network multicast transmit tree that public network multicast forward table is corresponding from the corresponding multicast data flow of local CE equipment.

In addition, user's side Transmit-Receive Unit 800, can also be used for receiving after the private network multicast IGMP leave message from local CE equipment, the private network multicast address carrying in private network multicast IGMP leave message is notified and offered private network multicast table maintenance unit 801 by deletion.

Private network multicast table maintenance unit 801, also deletes after notice for receiving, and the interface that user's side Transmit-Receive Unit 800 is received to private network multicast IGMP leave message is deleted from the private network multicast forward table of this private network multicast address; If the outgoing interface list in this private network multicast forward table is empty, deletes this private network multicast forward table, and send the notice of leaving of carrying this private network multicast address to public network address allocation units 805.

Public network address allocation units 805, also leave for determining public network multicast address corresponding to private network multicast address that notice is carried, and this public network multicast address is carried in public network multicast IGMP leave message and offers network side Transmit-Receive Unit 802.

Network side Transmit-Receive Unit 802, also sends for the BEB equipment to multicast source place the public network multicast IGMP leave message that public network address allocation units 805 provide.

More preferably, this BEB equipment can also comprise: example maintenance unit 810, for becoming while closing DOWN from starting UP at PBB example, is carried at this PBB example information to leave and in notice, offers public network address allocation units 805.

Public network address allocation units 805, also leave for determining all public network multicast address of notifying entrained PBB example information corresponding, and definite public network multicast address is carried at respectively in public network multicast IGMP leave message and offers network side Transmit-Receive Unit 802.

In addition, no matter be to receive flux of multicast from user's side Transmit-Receive Unit 800 or network side Transmit-Receive Unit 802, if local private network multicast forward table corresponding to private network multicast address that has this multicast data flow, multicast data flow can be copied after portion, according to this private network multicast forward table, be transmitted to local recipient CE equipment, this part is existing functional unit, is not described in detail in this.

By above description, can be found out, method and apparatus provided by the invention can possess following advantage:

1) by method provided by the invention, the BEB equipment that only has multicast source place is that private network multicast address distributes public network multicast address, and this public network multicast address is issued in PBB example, make to exist on the each BEB in PBB network the mapping relations between unified private network multicast address and public network multicast address, thereby make on each BEB equipment a private network multicast address only a corresponding public network multicast address transmit, according to public network multicast address transmit carry out flux of multicast forward time, can not produce redundant broadcast flow.

In addition, in the present invention, public network multicast address is in issuing process, each BEB equipment in PBB example can record the mapping relations between private network multicast address and public network multicast address, the public network multicast IGMP receiving in utilization joins message while forming public network multicast forward table, only have the BEB equipment of the mapping relations of existing just can set up public network multicast forward table and carry out subsequent group the forwarding of broadcasting flow, thereby guaranteed to only have the BEB equipment on multicast active path just can set up public network multicast forward table, further avoided the generation of redundancy flux of multicast.

2) in the present invention, the distribution of public network multicast address is triggered by flux of multicast, therefore, if there is not multicast source in network, in this PBB network, just can not exist for the public network multicast address of the corresponding private network multicast address distribution of this multicast source institute, on each BEB equipment, just can there is not the corresponding relation between public network multicast address and this private network multicast address yet, thereby can not be this private network multicast address waste public network address, can not take the list item resource on BEB equipment yet.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims

1. a method for processing multicast message in provider backbone bridging PBB network, is characterized in that, the method comprises:

2. method according to claim 1, it is characterized in that, receive the BEB equipment of the multicast data flow corresponding from the described private network multicast address of local CE, if the public network multicast forward table that has the public network multicast address that described private network multicast address is assigned with local, forwards according to public network multicast forward table corresponding to this private network multicast address.

3. method according to claim 1, it is characterized in that, by receive the interface that joins message of described private network multicast IGMP add described PBB example in this private network multicast IGMP join message before private network multicast forward table corresponding to entrained private network multicast address, also comprise: judge the local private network multicast forward table of whether having set up private network multicast address described in described PBB example, if, continue to carry out and describedly by receiving the interface that joins message of described private network multicast IGMP, add in described PBB example this private network multicast IGMP private network multicast forward table corresponding to entrained private network multicast address that join message, if not, set up the private network multicast forward table of entrained private network multicast address that joins message of this private network multicast IGMP in described PBB example, and continue to carry out and describedly by receiving interface that described private network multicast IGMP joins message, add in described PBB example this private network multicast IGMP private network multicast forward table corresponding to entrained private network multicast address that join message.

4. method according to claim 1, is characterized in that, the private network multicast IGMP that the backbone network core bridge joint BCB equipment interconnection in described PBB network is received joins message and carries out transparent transmission; After receiving described public network multicast IGMP and joining message, in this locality, set up or upgrade the public network multicast forward table of described public network multicast address, and continue to forward described public network multicast IGMP and join message to the BEB equipment at multicast source place.

5. method according to claim 1, it is characterized in that, if receiving the BEB equipment of described MD message determines when this locality does not exist the private network multicast forward table of described private network multicast address, recording after the mapping relations of described private network multicast address and public network multicast address, abandoning described MD message;

If receive the BEB equipment that described public network multicast IGMP joins message, do not record described mapping relations, continue described public network multicast IGMP to join message to the BEB device forwards at multicast source place.

6. according to right, want the method described in 3, it is characterized in that, before judging whether this locality has set up the private network multicast forward table of private network multicast address described in described PBB example, also comprise: judge the local mapping relations that comprise described private network multicast address that whether existed, if existed, directly to the BEB equipment at multicast source place, send public network multicast IGMP and join message, during this public network multicast IGMP joins message, carry the public network multicast address in the mapping relations that existed; If there is no, continue to carry out the disconnected local step of whether having set up the private network multicast forward table of private network multicast address described in described PBB example.

7. according to the method described in the arbitrary claim of claim 1 to 6, it is characterized in that, the public network multicast IGMP that the BEB equipment utilization at multicast source place receives joins message and sets up after described public network multicast forward table, and described multicast data flow is switched on the public network multicast transmit tree that described public network multicast forward table is corresponding.

8. according to the method described in the arbitrary claim of claim 1 to 6, it is characterized in that, if BEB equipment receives the private network multicast IGMP leave message from comprising of local CE equipment of described private network multicast address, the interface that receives this private network multicast IGMP leave message is deleted from the private network multicast forward table of this private network multicast address; If the outgoing interface list in described private network multicast address is empty, deletes the private network multicast forward table of described private network multicast address, and send to the BEB equipment at multicast source place the public network multicast IGMP leave message that carries corresponding public network multicast address;

Receive the BEB equipment of described private network multicast IGMP leave message, if the local private network multicast forward table that has private network multicast address described in described PBB example, the triplet information corresponding to described private network multicast address of deleting local record;

Receive the BEB equipment of described public network multicast IGMP leave message, the interface that receives this public network multicast IGMP leave message is deleted from the public network multicast forward table of described public network multicast address.

9. method according to claim 8, is characterized in that, when the described PBB example state on BEB equipment becomes and closes DOWN from starting UP, broadcasts the public network multicast IGMP leave message of all public network multicast address under described PBB example.

10. a backbone network edge bridge joint BEB equipment, it is characterized in that, this BEB equipment comprises: user's side Transmit-Receive Unit, private network multicast table maintenance unit, network side Transmit-Receive Unit, tlv triple are set up unit, first and judged that processing unit, public network address allocation units, second judge that processing unit, the 3rd judges processing unit and public network multicast table maintenance unit;

11. BEB equipment according to claim 10, it is characterized in that, described first judges processing unit, if also there is the public network multicast forward table of the public network multicast address that this private network multicast address is assigned with for judging this BEB equipment this locality, to described network side Transmit-Receive Unit transmitted traffic, forward notice;

Described network side Transmit-Receive Unit, also, for receiving after described traffic forwarding notice, the public network multicast forward table corresponding according to the private network multicast address of described flux of multicast forwards.

12. BEB equipment according to claim 10, is characterized in that, described private network multicast table maintenance unit specifically comprises: the first judgment sub-unit and private network multicast table are safeguarded subelement;

Described the first judgment sub-unit, for receiving, carry the adding after notice of private network multicast address, judge whether to set up the private network multicast forward table of this private network multicast address in described PBB example, if not, to described private network multicast table, safeguard that subelement sends foundation notice; If so, to described private network multicast maintenance subelement, send update notification;

Described private network multicast table is safeguarded subelement, be used for receiving and set up after notice, set up the private network multicast forward table of this private network multicast address in described PBB example, and the interface that described user's side Transmit-Receive Unit reception private network multicast IGMP is joined message adds described private network multicast forward table; Receive after update notification, the interface that described user's side Transmit-Receive Unit reception private network multicast IGMP is joined message adds described private network multicast forward table.

13. BEB equipment according to claim 10, it is characterized in that, described second judges processing unit, also when the private network multicast forward table of private network multicast address that does not exist described network side Transmit-Receive Unit to provide is provided, notify described network side Transmit-Receive Unit to abandon the MD message receiving;

The described the 3rd judges processing unit, while not also being present in the mapping relations of described public network address allocation units record for the public network multicast address of judging described network side Transmit-Receive Unit and providing, notify described network side Transmit-Receive Unit that the public network multicast IGMP receiving is joined message and continues the BEB device forwards to multicast source place.

14. BEB equipment according to claim 10, it is characterized in that, this BEB equipment also comprises: the 4th judges processing unit, for receiving described user's side Transmit-Receive Unit, offer the notice that adds of described private network multicast table maintenance unit, judging whether described public network address allocation units have been set up comprises this and adds the mapping relations of notifying entrained private network multicast address, if there is no, will described in add notice to be transmitted to described private network multicast table maintenance unit; If existed, public network multicast address corresponding in the mapping relations that comprise this private network multicast address of having set up is carried at during public network multicast IGMP joins message, this public network multicast IGMP is joined message and offers network side Transmit-Receive Unit;

Described network side Transmit-Receive Unit, also for judging that by the described the 4th the public network multicast IGMP that processing unit provides joins message to the BEB device forwards at multicast source place.

15. according to claim 10 to the BEB equipment described in 14 arbitrary claims, it is characterized in that, this BEB equipment also comprises: flow switch unit, for setting up after described public network multicast forward table at described public network multicast table maintenance unit, the described multicast data flow from local CE equipment is switched on the public network multicast transmit tree that described public network multicast forward table is corresponding.

16. according to claim 10 to the BEB equipment described in 14 arbitrary claims, it is characterized in that, described user's side Transmit-Receive Unit, also, for receiving after the private network multicast IGMP leave message from local CE equipment, the private network multicast address carrying in private network multicast IGMP leave message is notified and offered described private network multicast table maintenance unit by deletion;

Described private network multicast table maintenance unit, also deletes after notice for receiving, and the interface that described user's side Transmit-Receive Unit is received to described private network multicast IGMP leave message is deleted from the private network multicast forward table of this private network multicast address; If the outgoing interface list in this private network multicast forward table is empty, deletes this private network multicast forward table, and send the notice of leaving of carrying this private network multicast address to described public network address allocation units;

Described public network address allocation units also leave public network multicast address corresponding to private network multicast address that carry of notice described in determining, this public network multicast address is carried at and in public network multicast IGMP leave message, offers described network side Transmit-Receive Unit;

Described network side Transmit-Receive Unit, also sends for the BEB equipment to multicast source place the public network multicast IGMP leave message that described public network address allocation units provide.

17. BEB equipment according to claim 16, it is characterized in that, this BEB equipment also comprises: example maintenance unit, for becoming while closing DOWN from starting UP at described PBB example, is carried at this PBB example information to leave and in notice, offers described public network address allocation units;

Described public network address allocation units, also leave for determining all public network multicast address of notifying entrained PBB example information corresponding, and definite public network multicast address is carried at respectively and in public network multicast IGMP leave message, offers described network side Transmit-Receive Unit.